//=============================================================================
//
// Render/HLSLParser.cpp
//
// Created by Max McGuire (max@unknownworlds.com)
// Copyright (c) 2013, Unknown Worlds Entertainment, Inc.
//
//=============================================================================

//#include "Engine/String.h"
#include "Engine.h"

#include "HLSLParser.h"
#include "HLSLTree.h"

#include <algorithm>
#include <cmath>
#include <cstdlib>
#include <ctype.h>
#include <iostream>
#include <stack>
#include <string.h>

#if defined _WIN32 && !defined alloca
#include <malloc.h>
#endif /** _WIN32 */


namespace M4
{

enum CompareFunctionsResult
{
    FunctionsEqual,
    Function1Better,
    Function2Better
};

    
/** This structure stores a HLSLFunction-like declaration for an intrinsic function */
struct Intrinsic
{
    explicit Intrinsic(const char* name, HLSLBaseType returnType)
    {
        function.name                   = name;
        function.returnType.baseType    = returnType;
        function.numArguments           = 0;
    }
    explicit Intrinsic(const char* name, HLSLBaseType returnType, HLSLBaseType arg1)
    {
        function.name                   = name;
        function.returnType.baseType    = returnType;
        function.numArguments           = 1;
        function.argument               = argument + 0;
        argument[0].type.baseType       = arg1;
        argument[0].type.flags          = HLSLTypeFlag_Const;
    }
    explicit Intrinsic(const char* name, HLSLBaseType returnType, HLSLBaseType arg1, HLSLBaseType arg2)
    {
        function.name                   = name;
        function.returnType.baseType    = returnType;
        function.argument               = argument + 0;
        function.numArguments           = 2;
        argument[0].type.baseType       = arg1;
        argument[0].type.flags          = HLSLTypeFlag_Const;
        argument[0].nextArgument        = argument + 1;
        argument[1].type.baseType       = arg2;
        argument[1].type.flags          = HLSLTypeFlag_Const;
    }
    explicit Intrinsic(const char* name, HLSLBaseType returnType, HLSLBaseType arg1, HLSLBaseType arg2, HLSLBaseType arg3)
    {
        function.name                   = name;
        function.returnType.baseType    = returnType;
        function.argument               = argument + 0;
        function.numArguments           = 3;
        argument[0].type.baseType       = arg1;
        argument[0].type.flags          = HLSLTypeFlag_Const;
        argument[0].nextArgument        = argument + 1;
        argument[1].type.baseType       = arg2;
        argument[1].type.flags          = HLSLTypeFlag_Const;
        argument[1].nextArgument        = argument + 2;
        argument[2].type.baseType       = arg3;
        argument[2].type.flags          = HLSLTypeFlag_Const;
    }
    explicit Intrinsic(const char* name, HLSLBaseType returnType, HLSLBaseType arg1, HLSLBaseType arg2, HLSLBaseType arg3, HLSLBaseType arg4)
    {
        function.name                   = name;
        function.returnType.baseType    = returnType;
        function.argument               = argument + 0;
        function.numArguments           = 4;
        argument[0].type.baseType       = arg1;
        argument[0].type.flags          = HLSLTypeFlag_Const;
        argument[0].nextArgument        = argument + 1;
        argument[1].type.baseType       = arg2;
        argument[1].type.flags          = HLSLTypeFlag_Const;
        argument[1].nextArgument        = argument + 2;
        argument[2].type.baseType       = arg3;
        argument[2].type.flags          = HLSLTypeFlag_Const;
        argument[2].nextArgument        = argument + 3;
        argument[3].type.baseType       = arg4;
        argument[3].type.flags          = HLSLTypeFlag_Const;
    }
    HLSLFunction    function;
    HLSLArgument    argument[4];
};
    
Intrinsic SamplerIntrinsic(const char* name, HLSLBaseType returnType, HLSLBaseType arg1, HLSLBaseType samplerType, HLSLBaseType arg2)
{
    Intrinsic i(name, returnType, arg1, arg2);
    i.argument[0].type.samplerType = samplerType;
    return i;
}



static const int _numberTypeRank[NumericType_Count][NumericType_Count] = 
{
    //F  B  I  U
    { 0, 4, 4, 4 },  // NumericType_Float
    { 5, 0, 5, 5 },  // NumericType_Bool
    { 2, 4, 0, 1 },  // NumericType_Int
    { 2, 4, 1, 0 }   // NumericType_Uint
};


struct EffectStateValue
{
    const char * name;
    int value;
};

static const EffectStateValue textureFilteringValues[] = {
    {"None", 0},
    {"Point", 1},
    {"Linear", 2},
    {"Anisotropic", 3},
    {NULL, 0}
};

static const EffectStateValue textureAddressingValues[] = {
    {"Wrap", 1},
    {"Mirror", 2},
    {"Clamp", 3},
    {"Border", 4},
    {"MirrorOnce", 5},
    {NULL, 0}
};

static const EffectStateValue booleanValues[] = {
    {"False", 0},
    {"True", 1},
    {NULL, 0}
};

static const EffectStateValue cullValues[] = {
    {"None", 1},
    {"CW", 2},
    {"CCW", 3},
    {NULL, 0}
};

static const EffectStateValue cmpValues[] = {
    {"Never", 1},
    {"Less", 2},
    {"Equal", 3},
    {"LessEqual", 4},
    {"Greater", 5},
    {"NotEqual", 6},
    {"GreaterEqual", 7},
    {"Always", 8},
    {NULL, 0}
};

static const EffectStateValue blendValues[] = {
    {"Zero", 1},
    {"One", 2},
    {"SrcColor", 3},
    {"InvSrcColor", 4},
    {"SrcAlpha", 5},
    {"InvSrcAlpha", 6},
    {"DestAlpha", 7},
    {"InvDestAlpha", 8},
    {"DestColor", 9},
    {"InvDestColor", 10},
    {"SrcAlphaSat", 11},
    {"BothSrcAlpha", 12},
    {"BothInvSrcAlpha", 13},
    {"BlendFactor", 14},
    {"InvBlendFactor", 15},
    {"SrcColor2", 16},          // Dual source blending. D3D9Ex only.
    {"InvSrcColor2", 17},
    {NULL, 0}
};

static const EffectStateValue blendOpValues[] = {
    {"Add", 1},
    {"Subtract", 2},
    {"RevSubtract", 3},
    {"Min", 4},
    {"Max", 5},
    {NULL, 0}
};

static const EffectStateValue fillModeValues[] = {
    {"Point", 1},
    {"Wireframe", 2},
    {"Solid", 3},
    {NULL, 0}
};

static const EffectStateValue stencilOpValues[] = {
    {"Keep", 1},
    {"Zero", 2},
    {"Replace", 3},
    {"IncrSat", 4},
    {"DecrSat", 5},
    {"Invert", 6},
    {"Incr", 7},
    {"Decr", 8},
    {NULL, 0}
};

// These are flags.
static const EffectStateValue colorMaskValues[] = {
    {"False", 0},
    {"Red",   1<<0},
    {"Green", 1<<1},
    {"Blue",  1<<2},
    {"Alpha", 1<<3},
    {"X", 1<<0},
    {"Y", 1<<1},
    {"Z", 1<<2},
    {"W", 1<<3},
    {NULL, 0}
};

static const EffectStateValue integerValues[] = {
    {NULL, 0}
};

static const EffectStateValue floatValues[] = {
    {NULL, 0}
};


struct EffectState
{
    const char * name;
    int d3drs;
    const EffectStateValue * values;
};

static const EffectState samplerStates[] = {
    {"AddressU", 1, textureAddressingValues},
    {"AddressV", 2, textureAddressingValues},
    {"AddressW", 3, textureAddressingValues},
    // "BorderColor", 4, D3DCOLOR
    {"MagFilter", 5, textureFilteringValues},
    {"MinFilter", 6, textureFilteringValues},
    {"MipFilter", 7, textureFilteringValues},
    {"MipMapLodBias", 8, floatValues},
    {"MaxMipLevel", 9, integerValues},
    {"MaxAnisotropy", 10, integerValues},
    {"sRGBTexture", 11, booleanValues},    
};

static const EffectState effectStates[] = {
    {"VertexShader", 0, NULL},
    {"PixelShader", 0, NULL},
    {"AlphaBlendEnable", 27, booleanValues},
    {"SrcBlend", 19, blendValues},
    {"DestBlend", 20, blendValues},
    {"BlendOp", 171, blendOpValues},
    {"SeparateAlphaBlendEanble", 206, booleanValues},
    {"SrcBlendAlpha", 207, blendValues},
    {"DestBlendAlpha", 208, blendValues},
    {"BlendOpAlpha", 209, blendOpValues},
    {"AlphaTestEnable", 15, booleanValues},
    {"AlphaRef", 24, integerValues},
    {"AlphaFunc", 25, cmpValues},
    {"CullMode", 22, cullValues},
    {"ZEnable", 7, booleanValues},
    {"ZWriteEnable", 14, booleanValues},
    {"ZFunc", 23, cmpValues},
    {"StencilEnable", 52, booleanValues},
    {"StencilFail", 53, stencilOpValues},
    {"StencilZFail", 54, stencilOpValues},
    {"StencilPass", 55, stencilOpValues},
    {"StencilFunc", 56, cmpValues},
    {"StencilRef", 57, integerValues},
    {"StencilMask", 58, integerValues},
    {"StencilWriteMask", 59, integerValues},
    {"TwoSidedStencilMode", 185, booleanValues},
    {"CCW_StencilFail", 186, stencilOpValues},
    {"CCW_StencilZFail", 187, stencilOpValues},
    {"CCW_StencilPass", 188, stencilOpValues},
    {"CCW_StencilFunc", 189, cmpValues},
    {"ColorWriteEnable", 168, colorMaskValues},
    {"FillMode", 8, fillModeValues},
    {"MultisampleAlias", 161, booleanValues},
    {"MultisampleMask", 162, integerValues},
    {"ScissorTestEnable", 174, booleanValues},
    {"SlopeScaleDepthBias", 175, floatValues},
    {"DepthBias", 195, floatValues}
};


static const EffectStateValue witnessCullModeValues[] = {
    {"None", 0},
    {"Back", 1},
    {"Front", 2},
    {NULL, 0}
};

static const EffectStateValue witnessFillModeValues[] = {
    {"Solid", 0},
    {"Wireframe", 1},
    {NULL, 0}
};

static const EffectStateValue witnessBlendModeValues[] = {
    {"Disabled", 0},
    {"AlphaBlend", 1},          // src * a + dst * (1-a)
    {"Add", 2},                 // src + dst
    {"Mixed", 3},               // src + dst * (1-a)
    {"Multiply", 4},            // src * dst
    {"Multiply2", 5},           // 2 * src * dst
    {NULL, 0}
};

static const EffectStateValue witnessDepthFuncValues[] = {
    {"LessEqual", 0},
    {"Less", 1},
    {"Equal", 2},
    {"Greater", 3},
    {"Always", 4},
    {NULL, 0}
};

static const EffectStateValue witnessStencilModeValues[] = {
    {"Disabled", 0},
    {"Set", 1},
    {"Test", 2},
    {NULL, 0}
};

/* not used
static const EffectStateValue witnessFilterModeValues[] = {
    {"Point", 0},
    {"Linear", 1},
    {"Mipmap_Nearest", 2},
    {"Mipmap_Best", 3},     // Quality of mipmap filtering depends on render settings.
    {"Anisotropic", 4},     // Aniso without mipmaps for reflection maps.
    {NULL, 0}
};

static const EffectStateValue witnessWrapModeValues[] = {
    {"Repeat", 0},
    {"Clamp", 1},
    {"ClampToBorder", 2},
    {NULL, 0}
};
*/

static const EffectState pipelineStates[] = {
    {"VertexShader", 0, NULL},
    {"PixelShader", 0, NULL},

    // Depth_Stencil_State
    {"DepthWrite", 0, booleanValues},
    {"DepthEnable", 0, booleanValues},
    {"DepthFunc", 0, witnessDepthFuncValues},
    {"StencilMode", 0, witnessStencilModeValues},

    // Raster_State
    {"CullMode", 0, witnessCullModeValues},
    {"FillMode", 0, witnessFillModeValues},
    {"MultisampleEnable", 0, booleanValues},
    {"PolygonOffset", 0, booleanValues},

    // Blend_State
    {"BlendMode", 0, witnessBlendModeValues},
    {"ColorWrite", 0, booleanValues},
    {"AlphaWrite", 0, booleanValues},
    {"AlphaTest", 0, booleanValues},       // This is really alpha to coverage.
};





#define INTRINSIC_FLOAT1_FUNCTION(name) \
        Intrinsic( name, HLSLBaseType_Float,   HLSLBaseType_Float  ),   \
        Intrinsic( name, HLSLBaseType_Float2,  HLSLBaseType_Float2 ),   \
        Intrinsic( name, HLSLBaseType_Float3,  HLSLBaseType_Float3 ),   \
        Intrinsic( name, HLSLBaseType_Float4,  HLSLBaseType_Float4 )

#define INTRINSIC_FLOAT2_FUNCTION(name) \
        Intrinsic( name, HLSLBaseType_Float,   HLSLBaseType_Float,   HLSLBaseType_Float  ),   \
        Intrinsic( name, HLSLBaseType_Float2,  HLSLBaseType_Float2,  HLSLBaseType_Float2 ),   \
        Intrinsic( name, HLSLBaseType_Float3,  HLSLBaseType_Float3,  HLSLBaseType_Float3 ),   \
        Intrinsic( name, HLSLBaseType_Float4,  HLSLBaseType_Float4,  HLSLBaseType_Float4 )

#define INTRINSIC_FLOAT3_FUNCTION(name) \
        Intrinsic( name, HLSLBaseType_Float,   HLSLBaseType_Float,   HLSLBaseType_Float,  HLSLBaseType_Float ),   \
        Intrinsic( name, HLSLBaseType_Float2,  HLSLBaseType_Float2,  HLSLBaseType_Float2,  HLSLBaseType_Float2 ),  \
        Intrinsic( name, HLSLBaseType_Float3,  HLSLBaseType_Float3,  HLSLBaseType_Float3,  HLSLBaseType_Float3 ),  \
        Intrinsic( name, HLSLBaseType_Float4,  HLSLBaseType_Float4,  HLSLBaseType_Float4,  HLSLBaseType_Float4 )

#if 0
// @@ IC: For some reason this is not working with the Visual Studio compiler:
#define SAMPLER_INTRINSIC_FUNCTION(name, sampler, arg1) \
        SamplerIntrinsic( name, HLSLBaseType_Float4, sampler, HLSLBaseType_Float, arg1)
#else
#define SAMPLER_INTRINSIC_FUNCTION(name, sampler, arg1) \
        Intrinsic( name, HLSLBaseType_Float4, sampler, arg1)
#endif
    
const Intrinsic _intrinsic[] =
    {
        INTRINSIC_FLOAT1_FUNCTION( "abs" ),
        INTRINSIC_FLOAT1_FUNCTION( "acos" ),

        Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Float ),
        Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Float2 ),
        Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Float3 ),
        Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Float4 ),
        Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Float2x4 ),
        Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Float2x3 ),
		Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Float2x2 ),
        Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Float3x4 ),
        Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Float3x3 ),
        Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Float3x2 ),
        Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Float4x4 ),
        Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Float4x3 ),
        Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Float4x2 ),
        Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Bool ),
        Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Int ),
        Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Int2 ),
        Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Int3 ),
        Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Int4 ),
        Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Uint ),
        Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Uint2 ),
        Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Uint3 ),
        Intrinsic( "any", HLSLBaseType_Bool, HLSLBaseType_Uint4 ),

        INTRINSIC_FLOAT1_FUNCTION( "asin" ),
        INTRINSIC_FLOAT1_FUNCTION( "atan" ),
        INTRINSIC_FLOAT2_FUNCTION( "atan2" ),
        INTRINSIC_FLOAT3_FUNCTION( "clamp" ),
        INTRINSIC_FLOAT1_FUNCTION( "cos" ),
        INTRINSIC_FLOAT1_FUNCTION( "tan" ),

        INTRINSIC_FLOAT3_FUNCTION( "lerp" ),
        INTRINSIC_FLOAT3_FUNCTION( "smoothstep" ),

        INTRINSIC_FLOAT1_FUNCTION( "floor" ),
        INTRINSIC_FLOAT1_FUNCTION( "ceil" ),
        INTRINSIC_FLOAT1_FUNCTION( "round" ),
        INTRINSIC_FLOAT1_FUNCTION( "frac" ),

        INTRINSIC_FLOAT2_FUNCTION( "fmod" ),

        Intrinsic( "clip", HLSLBaseType_Void,  HLSLBaseType_Float    ),
        Intrinsic( "clip", HLSLBaseType_Void,  HLSLBaseType_Float2   ),
        Intrinsic( "clip", HLSLBaseType_Void,  HLSLBaseType_Float3   ),
        Intrinsic( "clip", HLSLBaseType_Void,  HLSLBaseType_Float4   ),

        Intrinsic( "dot", HLSLBaseType_Float,  HLSLBaseType_Float,   HLSLBaseType_Float  ),
        Intrinsic( "dot", HLSLBaseType_Float,  HLSLBaseType_Float2,  HLSLBaseType_Float2 ),
        Intrinsic( "dot", HLSLBaseType_Float,  HLSLBaseType_Float3,  HLSLBaseType_Float3 ),
        Intrinsic( "dot", HLSLBaseType_Float,  HLSLBaseType_Float4,  HLSLBaseType_Float4 ),

        Intrinsic( "cross", HLSLBaseType_Float3,  HLSLBaseType_Float3,  HLSLBaseType_Float3 ),

        Intrinsic( "length", HLSLBaseType_Float,  HLSLBaseType_Float  ),
        Intrinsic( "length", HLSLBaseType_Float,  HLSLBaseType_Float2 ),
        Intrinsic( "length", HLSLBaseType_Float,  HLSLBaseType_Float3 ),
        Intrinsic( "length", HLSLBaseType_Float,  HLSLBaseType_Float4 ),

        INTRINSIC_FLOAT2_FUNCTION( "max" ),
        INTRINSIC_FLOAT2_FUNCTION( "min" ),

        // @@ Add all combinations.
        // https://docs.microsoft.com/en-us/windows/desktop/direct3dhlsl/dx-graphics-hlsl-mul

        // scalar = mul(scalar, scalar)
        Intrinsic( "mul", HLSLBaseType_Float, HLSLBaseType_Float, HLSLBaseType_Float),

        // vector<N> = mul(scalar, vector<N>)
        Intrinsic( "mul", HLSLBaseType_Float4, HLSLBaseType_Float, HLSLBaseType_Float4),
        Intrinsic( "mul", HLSLBaseType_Float3, HLSLBaseType_Float, HLSLBaseType_Float3),
        Intrinsic( "mul", HLSLBaseType_Float2, HLSLBaseType_Float, HLSLBaseType_Float2),

        // matrix<N,M> = mul(scalar, matrix<M,N>)
        Intrinsic( "mul", HLSLBaseType_Float4x4, HLSLBaseType_Float, HLSLBaseType_Float4x4),
        Intrinsic( "mul", HLSLBaseType_Float4x3, HLSLBaseType_Float, HLSLBaseType_Float4x3),
        Intrinsic( "mul", HLSLBaseType_Float4x2, HLSLBaseType_Float, HLSLBaseType_Float4x2),

        Intrinsic( "mul", HLSLBaseType_Float3x4, HLSLBaseType_Float, HLSLBaseType_Float3x4),
        Intrinsic( "mul", HLSLBaseType_Float3x3, HLSLBaseType_Float, HLSLBaseType_Float3x3),
        Intrinsic( "mul", HLSLBaseType_Float3x2, HLSLBaseType_Float, HLSLBaseType_Float3x2),

        Intrinsic( "mul", HLSLBaseType_Float2x4, HLSLBaseType_Float, HLSLBaseType_Float2x4),
        Intrinsic( "mul", HLSLBaseType_Float2x3, HLSLBaseType_Float, HLSLBaseType_Float2x3),
        Intrinsic( "mul", HLSLBaseType_Float2x2, HLSLBaseType_Float, HLSLBaseType_Float2x2),

        // vector<N> = mul(vector<N>, scalar)
        Intrinsic( "mul", HLSLBaseType_Float4, HLSLBaseType_Float4, HLSLBaseType_Float),
        Intrinsic( "mul", HLSLBaseType_Float3, HLSLBaseType_Float3, HLSLBaseType_Float),
        Intrinsic( "mul", HLSLBaseType_Float2, HLSLBaseType_Float2, HLSLBaseType_Float),

        // scalar = mul(vector<N>, vector<N>) it's a dot product !
        Intrinsic( "mul", HLSLBaseType_Float, HLSLBaseType_Float4, HLSLBaseType_Float4),
        Intrinsic( "mul", HLSLBaseType_Float, HLSLBaseType_Float3, HLSLBaseType_Float3),
        Intrinsic( "mul", HLSLBaseType_Float, HLSLBaseType_Float2, HLSLBaseType_Float2),

        // vector<M> = mul(vector<N>, matrix<N,M>)
        Intrinsic( "mul", HLSLBaseType_Float4, HLSLBaseType_Float4, HLSLBaseType_Float4x4),
        Intrinsic( "mul", HLSLBaseType_Float3, HLSLBaseType_Float4, HLSLBaseType_Float4x3),
        Intrinsic( "mul", HLSLBaseType_Float2, HLSLBaseType_Float4, HLSLBaseType_Float4x2),

        Intrinsic( "mul", HLSLBaseType_Float4, HLSLBaseType_Float3, HLSLBaseType_Float3x4),
        Intrinsic( "mul", HLSLBaseType_Float3, HLSLBaseType_Float3, HLSLBaseType_Float3x3),
        Intrinsic( "mul", HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float3x2),

        Intrinsic( "mul", HLSLBaseType_Float4, HLSLBaseType_Float2, HLSLBaseType_Float2x4),
        Intrinsic( "mul", HLSLBaseType_Float3, HLSLBaseType_Float2, HLSLBaseType_Float2x3),
        Intrinsic( "mul", HLSLBaseType_Float2, HLSLBaseType_Float2, HLSLBaseType_Float2x2),

        // matrix<N,M> = mul(matrix<N,M>,scalar)
        Intrinsic( "mul", HLSLBaseType_Float4x4, HLSLBaseType_Float4x4, HLSLBaseType_Float),
        Intrinsic( "mul", HLSLBaseType_Float3x4, HLSLBaseType_Float3x4, HLSLBaseType_Float),
        Intrinsic( "mul", HLSLBaseType_Float2x4, HLSLBaseType_Float2x4, HLSLBaseType_Float),

        Intrinsic( "mul", HLSLBaseType_Float4x3, HLSLBaseType_Float4x3, HLSLBaseType_Float),
        Intrinsic( "mul", HLSLBaseType_Float3x3, HLSLBaseType_Float3x3, HLSLBaseType_Float),
        Intrinsic( "mul", HLSLBaseType_Float2x3, HLSLBaseType_Float2x3, HLSLBaseType_Float),

        Intrinsic( "mul", HLSLBaseType_Float4x2, HLSLBaseType_Float4x2, HLSLBaseType_Float),
        Intrinsic( "mul", HLSLBaseType_Float3x2, HLSLBaseType_Float3x2, HLSLBaseType_Float),
        Intrinsic( "mul", HLSLBaseType_Float2x2, HLSLBaseType_Float2x2, HLSLBaseType_Float),

        // vector<N> = mul(matrix<N,M>, vector<M>)
        Intrinsic( "mul", HLSLBaseType_Float4, HLSLBaseType_Float4x4, HLSLBaseType_Float4),
        Intrinsic( "mul", HLSLBaseType_Float3, HLSLBaseType_Float3x4, HLSLBaseType_Float4),
        Intrinsic( "mul", HLSLBaseType_Float2, HLSLBaseType_Float2x4, HLSLBaseType_Float4),

        Intrinsic( "mul", HLSLBaseType_Float4, HLSLBaseType_Float4x3, HLSLBaseType_Float3),
        Intrinsic( "mul", HLSLBaseType_Float3, HLSLBaseType_Float3x3, HLSLBaseType_Float3),
        Intrinsic( "mul", HLSLBaseType_Float2, HLSLBaseType_Float2x3, HLSLBaseType_Float3),

        Intrinsic( "mul", HLSLBaseType_Float4, HLSLBaseType_Float4x2, HLSLBaseType_Float2),
        Intrinsic( "mul", HLSLBaseType_Float3, HLSLBaseType_Float3x2, HLSLBaseType_Float2),
        Intrinsic( "mul", HLSLBaseType_Float2, HLSLBaseType_Float2x2, HLSLBaseType_Float2),

        // matrix<N,M> = mul(matrix<N,4>, matrix<4,M)
        Intrinsic( "mul", HLSLBaseType_Float4x4, HLSLBaseType_Float4x4, HLSLBaseType_Float4x4 ),
        Intrinsic( "mul", HLSLBaseType_Float4x3, HLSLBaseType_Float4x4, HLSLBaseType_Float4x3 ),
        Intrinsic( "mul", HLSLBaseType_Float4x2, HLSLBaseType_Float4x4, HLSLBaseType_Float4x2 ),

        Intrinsic( "mul", HLSLBaseType_Float3x4, HLSLBaseType_Float3x4, HLSLBaseType_Float4x4 ),
        Intrinsic( "mul", HLSLBaseType_Float3x3, HLSLBaseType_Float3x4, HLSLBaseType_Float4x3 ),
        Intrinsic( "mul", HLSLBaseType_Float3x2, HLSLBaseType_Float3x4, HLSLBaseType_Float4x2 ),

        Intrinsic( "mul", HLSLBaseType_Float2x4, HLSLBaseType_Float2x4, HLSLBaseType_Float4x4 ),
        Intrinsic( "mul", HLSLBaseType_Float2x3, HLSLBaseType_Float2x4, HLSLBaseType_Float4x3 ),
        Intrinsic( "mul", HLSLBaseType_Float2x2, HLSLBaseType_Float2x4, HLSLBaseType_Float4x2 ),

        // matrix<N,M> = mul(matrix<N,3>, matrix<3,M>)
        Intrinsic( "mul", HLSLBaseType_Float4x4, HLSLBaseType_Float4x3, HLSLBaseType_Float3x4 ),
        Intrinsic( "mul", HLSLBaseType_Float4x3, HLSLBaseType_Float4x3, HLSLBaseType_Float3x3 ),
        Intrinsic( "mul", HLSLBaseType_Float4x2, HLSLBaseType_Float4x3, HLSLBaseType_Float3x2 ),

        Intrinsic( "mul", HLSLBaseType_Float3x4, HLSLBaseType_Float3x3, HLSLBaseType_Float3x4 ),
        Intrinsic( "mul", HLSLBaseType_Float3x3, HLSLBaseType_Float3x3, HLSLBaseType_Float3x3 ),
        Intrinsic( "mul", HLSLBaseType_Float3x2, HLSLBaseType_Float3x3, HLSLBaseType_Float3x2 ),

        Intrinsic( "mul", HLSLBaseType_Float2x4, HLSLBaseType_Float2x3, HLSLBaseType_Float3x4 ),
        Intrinsic( "mul", HLSLBaseType_Float2x3, HLSLBaseType_Float2x3, HLSLBaseType_Float3x3 ),
        Intrinsic( "mul", HLSLBaseType_Float2x2, HLSLBaseType_Float2x3, HLSLBaseType_Float3x2 ),

        // matrix<N,M> = mul(matrix<N,2>, matrix<2,M>)
        Intrinsic( "mul", HLSLBaseType_Float4x4, HLSLBaseType_Float4x2, HLSLBaseType_Float2x4 ),
        Intrinsic( "mul", HLSLBaseType_Float4x3, HLSLBaseType_Float4x2, HLSLBaseType_Float2x3 ),
        Intrinsic( "mul", HLSLBaseType_Float4x2, HLSLBaseType_Float4x2, HLSLBaseType_Float2x2 ),

        Intrinsic( "mul", HLSLBaseType_Float3x4, HLSLBaseType_Float3x2, HLSLBaseType_Float2x4 ),
        Intrinsic( "mul", HLSLBaseType_Float3x3, HLSLBaseType_Float3x2, HLSLBaseType_Float2x3 ),
        Intrinsic( "mul", HLSLBaseType_Float3x2, HLSLBaseType_Float3x2, HLSLBaseType_Float2x2 ),

        Intrinsic( "mul", HLSLBaseType_Float2x4, HLSLBaseType_Float2x2, HLSLBaseType_Float2x4 ),
        Intrinsic( "mul", HLSLBaseType_Float2x3, HLSLBaseType_Float2x2, HLSLBaseType_Float2x3 ),
        Intrinsic( "mul", HLSLBaseType_Float2x2, HLSLBaseType_Float2x2, HLSLBaseType_Float2x2 ),


		Intrinsic( "transpose", HLSLBaseType_Float2x2, HLSLBaseType_Float2x2 ),
        Intrinsic( "transpose", HLSLBaseType_Float3x3, HLSLBaseType_Float3x3 ),
        Intrinsic( "transpose", HLSLBaseType_Float4x4, HLSLBaseType_Float4x4 ),

        INTRINSIC_FLOAT2_FUNCTION( "modf" ),

        INTRINSIC_FLOAT1_FUNCTION( "normalize" ),
        INTRINSIC_FLOAT2_FUNCTION( "pow" ),
        INTRINSIC_FLOAT1_FUNCTION( "saturate" ),
        INTRINSIC_FLOAT1_FUNCTION( "sin" ),
        INTRINSIC_FLOAT1_FUNCTION( "sqrt" ),
        INTRINSIC_FLOAT1_FUNCTION( "rsqrt" ),
        INTRINSIC_FLOAT1_FUNCTION( "rcp" ),
        INTRINSIC_FLOAT1_FUNCTION( "exp" ),
        INTRINSIC_FLOAT1_FUNCTION( "exp2" ),
        INTRINSIC_FLOAT1_FUNCTION( "log" ),
        INTRINSIC_FLOAT1_FUNCTION( "log2" ),
        INTRINSIC_FLOAT1_FUNCTION( "log10" ),
        
        INTRINSIC_FLOAT1_FUNCTION( "ddx" ),
        INTRINSIC_FLOAT1_FUNCTION( "ddy" ),
        
        INTRINSIC_FLOAT1_FUNCTION( "sign" ),
        INTRINSIC_FLOAT2_FUNCTION( "step" ),
        INTRINSIC_FLOAT2_FUNCTION( "reflect" ),

		Intrinsic("isnan",    HLSLBaseType_Bool, HLSLBaseType_Float),
		Intrinsic("isinf",    HLSLBaseType_Bool, HLSLBaseType_Float),

		Intrinsic("asuint",    HLSLBaseType_Uint, HLSLBaseType_Float),

        SAMPLER_INTRINSIC_FUNCTION("tex2D", HLSLBaseType_Sampler2D, HLSLBaseType_Float2),
        
        Intrinsic("tex2Dproj", HLSLBaseType_Float4, HLSLBaseType_Sampler2D, HLSLBaseType_Float4),

        SAMPLER_INTRINSIC_FUNCTION("tex2Dlod", HLSLBaseType_Sampler2D, HLSLBaseType_Float4),
        
        Intrinsic("tex2Dlod",  HLSLBaseType_Float4, HLSLBaseType_Sampler2D, HLSLBaseType_Float4, HLSLBaseType_Int2),   // With offset.

        SAMPLER_INTRINSIC_FUNCTION("tex2Dbias", HLSLBaseType_Sampler2D, HLSLBaseType_Float4),
        
        Intrinsic("tex2Dgrad", HLSLBaseType_Float4, HLSLBaseType_Sampler2D, HLSLBaseType_Float2, HLSLBaseType_Float2, HLSLBaseType_Float2),
        Intrinsic("tex2Dgather", HLSLBaseType_Float4, HLSLBaseType_Sampler2D, HLSLBaseType_Float2, HLSLBaseType_Int),
        Intrinsic("tex2Dgather", HLSLBaseType_Float4, HLSLBaseType_Sampler2D, HLSLBaseType_Float2, HLSLBaseType_Int2, HLSLBaseType_Int),    // With offset.
        Intrinsic("tex2Dsize", HLSLBaseType_Int2, HLSLBaseType_Sampler2D),
        Intrinsic("tex2Dfetch", HLSLBaseType_Float4, HLSLBaseType_Sampler2D, HLSLBaseType_Int3),    // u,v,mipmap

        Intrinsic("tex2Dcmp", HLSLBaseType_Float4, HLSLBaseType_Sampler2DShadow, HLSLBaseType_Float4),                // @@ IC: This really takes a float3 (uvz) and returns a float.

        Intrinsic("tex2DMSfetch", HLSLBaseType_Float4, HLSLBaseType_Sampler2DMS, HLSLBaseType_Int2, HLSLBaseType_Int),
        Intrinsic("tex2DMSsize", HLSLBaseType_Int3, HLSLBaseType_Sampler2DMS),

        Intrinsic("tex2DArray", HLSLBaseType_Float4, HLSLBaseType_Sampler2DArray, HLSLBaseType_Float3),

        Intrinsic("tex3D",     HLSLBaseType_Float4, HLSLBaseType_Sampler3D, HLSLBaseType_Float3),
        Intrinsic("tex3Dlod",  HLSLBaseType_Float4, HLSLBaseType_Sampler3D, HLSLBaseType_Float4),
        Intrinsic("tex3Dbias", HLSLBaseType_Float4, HLSLBaseType_Sampler3D, HLSLBaseType_Float4),
        Intrinsic("tex3Dsize", HLSLBaseType_Int3, HLSLBaseType_Sampler3D),

        Intrinsic("texCUBE",       HLSLBaseType_Float4, HLSLBaseType_SamplerCube, HLSLBaseType_Float3),
        Intrinsic("texCUBElod", HLSLBaseType_Float4, HLSLBaseType_SamplerCube, HLSLBaseType_Float4),
        Intrinsic("texCUBEbias", HLSLBaseType_Float4, HLSLBaseType_SamplerCube, HLSLBaseType_Float4),
        Intrinsic("texCUBEsize", HLSLBaseType_Int, HLSLBaseType_SamplerCube),

        Intrinsic( "sincos", HLSLBaseType_Void,  HLSLBaseType_Float,   HLSLBaseType_Float,  HLSLBaseType_Float ),
        Intrinsic( "sincos", HLSLBaseType_Void,  HLSLBaseType_Float2,  HLSLBaseType_Float,  HLSLBaseType_Float2 ),
        Intrinsic( "sincos", HLSLBaseType_Void,  HLSLBaseType_Float3,  HLSLBaseType_Float,  HLSLBaseType_Float3 ),
        Intrinsic( "sincos", HLSLBaseType_Void,  HLSLBaseType_Float4,  HLSLBaseType_Float,  HLSLBaseType_Float4 ),

        Intrinsic( "mad", HLSLBaseType_Float, HLSLBaseType_Float, HLSLBaseType_Float, HLSLBaseType_Float ),
        Intrinsic( "mad", HLSLBaseType_Float2, HLSLBaseType_Float2, HLSLBaseType_Float2, HLSLBaseType_Float2 ),
        Intrinsic( "mad", HLSLBaseType_Float3, HLSLBaseType_Float3, HLSLBaseType_Float3, HLSLBaseType_Float3 ),
        Intrinsic( "mad", HLSLBaseType_Float4, HLSLBaseType_Float4, HLSLBaseType_Float4, HLSLBaseType_Float4 ),
    };

const int _numIntrinsics = sizeof(_intrinsic) / sizeof(Intrinsic);

// The order in this array must match up with HLSLBinaryOp
const int _binaryOpPriority[] =
    {
        2, 1, //  &&, ||
        8, 8, //  +,  -
        9, 9, //  *,  /
        7, 7, //  <,  >,
        7, 7, //  <=, >=,
        6, 6, //  ==, !=
        5, 3, 4, // &, |, ^
    };


// IC: I'm not sure this table is right, but any errors should be caught by the backend compiler.
// Also, this is operator dependent. The type resulting from (float4 * float4x4) is not the same as (float4 + float4x4).
// We should probably distinguish between component-wise operator and only allow same dimensions
HLSLBaseType _binaryOpTypeLookup[HLSLBaseType_NumericCount][HLSLBaseType_NumericCount] = 
    {
        {   // float
            HLSLBaseType_Float, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float4,
            HLSLBaseType_Float2x4, HLSLBaseType_Float2x3, HLSLBaseType_Float2x2,
            HLSLBaseType_Float3x4, HLSLBaseType_Float3x3, HLSLBaseType_Float3x2,
            HLSLBaseType_Float4x4, HLSLBaseType_Float4x3, HLSLBaseType_Float4x2,
            HLSLBaseType_Float, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float4,
            HLSLBaseType_Float, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float4,
            HLSLBaseType_Float, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float4
        },
        {   // float2
            HLSLBaseType_Float2, HLSLBaseType_Float2, HLSLBaseType_Float2, HLSLBaseType_Float2,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float2, HLSLBaseType_Float2, HLSLBaseType_Float2, HLSLBaseType_Float2,
            HLSLBaseType_Float2, HLSLBaseType_Float2, HLSLBaseType_Float2, HLSLBaseType_Float2,
            HLSLBaseType_Float2, HLSLBaseType_Float2, HLSLBaseType_Float2, HLSLBaseType_Float2
        },
        {   // float3
            HLSLBaseType_Float3, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float3,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float3, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float3,
            HLSLBaseType_Float3, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float3,
            HLSLBaseType_Float3, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float3
        },
        {   // float4
            HLSLBaseType_Float4, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float4,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float4, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float4,
            HLSLBaseType_Float4, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float4,
            HLSLBaseType_Float4, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float4
        },
        {   // float2x4
            HLSLBaseType_Float2x4, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float2x4, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float2x4, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float2x4, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float2x4, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown
        },
        {   // float2x3
            HLSLBaseType_Float2x3, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Float2x3, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float2x3, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float2x3, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float2x3, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown
        },
        {   // float2x2
            HLSLBaseType_Float2x2, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Float2x2,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float2x2, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float2x2, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float2x2, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown
        },
        {   // float3x4
            HLSLBaseType_Float3x4, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float3x4, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float3x4, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float3x4, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float3x4, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown
        },
        {   // float3x3
            HLSLBaseType_Float3x3, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Float3x3, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float3x3, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float3x3, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float3x3, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown
        },
        {   // float3x2
            HLSLBaseType_Float3x2, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Float3x2,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float3x2, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float3x2, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float3x2, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown
        },
        {   // float4x4
            HLSLBaseType_Float4x4, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float4x4, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float4x4, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float4x4, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float4x4, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown
        },
        {   // float4x3
            HLSLBaseType_Float4x3, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Float4x3, HLSLBaseType_Unknown,
            HLSLBaseType_Float4x3, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float4x3, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float4x3, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown
        },
        {   // float4x2
            HLSLBaseType_Float4x2, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Float4x2,
            HLSLBaseType_Float4x2, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float4x2, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Float4x2, HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown
        },
         {   // bool
            HLSLBaseType_Float, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float4,
            HLSLBaseType_Float2x4, HLSLBaseType_Float2x3, HLSLBaseType_Float2x2,
            HLSLBaseType_Float3x4, HLSLBaseType_Float3x3, HLSLBaseType_Float3x2,
            HLSLBaseType_Float4x4, HLSLBaseType_Float4x3, HLSLBaseType_Float4x2,
            HLSLBaseType_Int, HLSLBaseType_Int2, HLSLBaseType_Int3, HLSLBaseType_Int4,
            HLSLBaseType_Int, HLSLBaseType_Int2, HLSLBaseType_Int3, HLSLBaseType_Int4,
            HLSLBaseType_Uint, HLSLBaseType_Uint2, HLSLBaseType_Uint3, HLSLBaseType_Uint4
        },
        {   // bool2
            HLSLBaseType_Float2, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float4,
            HLSLBaseType_Float2x4, HLSLBaseType_Float2x3, HLSLBaseType_Float2x2,
            HLSLBaseType_Float3x4, HLSLBaseType_Float3x3, HLSLBaseType_Float3x2,
            HLSLBaseType_Float4x4, HLSLBaseType_Float4x3, HLSLBaseType_Float4x2,
            HLSLBaseType_Int2, HLSLBaseType_Int2, HLSLBaseType_Int3, HLSLBaseType_Int4,
            HLSLBaseType_Int2, HLSLBaseType_Int2, HLSLBaseType_Int3, HLSLBaseType_Int4,
            HLSLBaseType_Uint2, HLSLBaseType_Uint2, HLSLBaseType_Uint3, HLSLBaseType_Uint4
        },
        {   // bool3
            HLSLBaseType_Float3, HLSLBaseType_Float3, HLSLBaseType_Float3, HLSLBaseType_Float4,
            HLSLBaseType_Float2x4, HLSLBaseType_Float2x3, HLSLBaseType_Float2x2,
            HLSLBaseType_Float3x4, HLSLBaseType_Float3x3, HLSLBaseType_Float3x2,
            HLSLBaseType_Float4x4, HLSLBaseType_Float4x3, HLSLBaseType_Float4x2,
            HLSLBaseType_Int3, HLSLBaseType_Int2, HLSLBaseType_Int3, HLSLBaseType_Int4,
            HLSLBaseType_Int3, HLSLBaseType_Int2, HLSLBaseType_Int3, HLSLBaseType_Int4,
            HLSLBaseType_Uint3, HLSLBaseType_Uint2, HLSLBaseType_Uint3, HLSLBaseType_Uint4
        },
        {   // bool4
            HLSLBaseType_Float, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float4,
            HLSLBaseType_Float2x4, HLSLBaseType_Float2x3, HLSLBaseType_Float2x2,
            HLSLBaseType_Float3x4, HLSLBaseType_Float3x3, HLSLBaseType_Float3x2,
            HLSLBaseType_Float4x4, HLSLBaseType_Float4x3, HLSLBaseType_Float4x2,
            HLSLBaseType_Int, HLSLBaseType_Int2, HLSLBaseType_Int3, HLSLBaseType_Int4,
            HLSLBaseType_Int, HLSLBaseType_Int2, HLSLBaseType_Int3, HLSLBaseType_Int4,
            HLSLBaseType_Uint, HLSLBaseType_Uint2, HLSLBaseType_Uint3, HLSLBaseType_Uint4
        },
        {   // int
            HLSLBaseType_Float, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float4,
            HLSLBaseType_Float2x4, HLSLBaseType_Float2x3, HLSLBaseType_Float2x2,
            HLSLBaseType_Float3x4, HLSLBaseType_Float3x3, HLSLBaseType_Float3x2,
            HLSLBaseType_Float4x4, HLSLBaseType_Float4x3, HLSLBaseType_Float4x2,
            HLSLBaseType_Int, HLSLBaseType_Int2, HLSLBaseType_Int2, HLSLBaseType_Int2,
            HLSLBaseType_Int, HLSLBaseType_Int2, HLSLBaseType_Int3, HLSLBaseType_Int4,
            HLSLBaseType_Uint, HLSLBaseType_Uint2, HLSLBaseType_Uint3, HLSLBaseType_Uint4
        },
        {   // int2
            HLSLBaseType_Float2, HLSLBaseType_Float2, HLSLBaseType_Float2, HLSLBaseType_Float2,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Int2, HLSLBaseType_Int2, HLSLBaseType_Int2, HLSLBaseType_Int2,
            HLSLBaseType_Int2, HLSLBaseType_Int2, HLSLBaseType_Int2, HLSLBaseType_Int2,
            HLSLBaseType_Uint2, HLSLBaseType_Uint2, HLSLBaseType_Uint2, HLSLBaseType_Uint2
        },
        {   // int3
            HLSLBaseType_Float3, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float3,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Int3, HLSLBaseType_Int2, HLSLBaseType_Int3, HLSLBaseType_Int3,
            HLSLBaseType_Int3, HLSLBaseType_Int2, HLSLBaseType_Int3, HLSLBaseType_Int3,
            HLSLBaseType_Uint3, HLSLBaseType_Uint2, HLSLBaseType_Uint3, HLSLBaseType_Uint3
        },
        {   // int4
            HLSLBaseType_Float4, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float4,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Int4, HLSLBaseType_Int2, HLSLBaseType_Int3, HLSLBaseType_Int4,
            HLSLBaseType_Int4, HLSLBaseType_Int2, HLSLBaseType_Int3, HLSLBaseType_Int4,
            HLSLBaseType_Uint4, HLSLBaseType_Uint2, HLSLBaseType_Uint3, HLSLBaseType_Uint4
        },
        {   // uint
            HLSLBaseType_Float, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float4,
            HLSLBaseType_Float2x4, HLSLBaseType_Float2x3, HLSLBaseType_Float2x2,
            HLSLBaseType_Float3x4, HLSLBaseType_Float3x3, HLSLBaseType_Float3x2,
            HLSLBaseType_Float4x4, HLSLBaseType_Float4x3, HLSLBaseType_Float4x2,
            HLSLBaseType_Uint, HLSLBaseType_Uint2, HLSLBaseType_Uint3, HLSLBaseType_Uint4,
            HLSLBaseType_Uint, HLSLBaseType_Uint2, HLSLBaseType_Uint3, HLSLBaseType_Uint4,
            HLSLBaseType_Uint, HLSLBaseType_Uint2, HLSLBaseType_Uint3, HLSLBaseType_Uint4
        },
        {   // uint2
            HLSLBaseType_Float2, HLSLBaseType_Float2, HLSLBaseType_Float2, HLSLBaseType_Float2,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Uint2, HLSLBaseType_Uint2, HLSLBaseType_Uint2, HLSLBaseType_Uint2,
            HLSLBaseType_Uint2, HLSLBaseType_Uint2, HLSLBaseType_Uint2, HLSLBaseType_Uint2,
            HLSLBaseType_Uint2, HLSLBaseType_Uint2, HLSLBaseType_Uint2, HLSLBaseType_Uint2
        },
        {   // uint3
            HLSLBaseType_Float3, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float3,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Uint3, HLSLBaseType_Uint2, HLSLBaseType_Uint3, HLSLBaseType_Uint3,
            HLSLBaseType_Uint3, HLSLBaseType_Uint2, HLSLBaseType_Uint3, HLSLBaseType_Uint3,
            HLSLBaseType_Uint3, HLSLBaseType_Uint2, HLSLBaseType_Uint3, HLSLBaseType_Uint3
        },
        {   // uint4
            HLSLBaseType_Float4, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float4,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Unknown, HLSLBaseType_Unknown, HLSLBaseType_Unknown,
            HLSLBaseType_Uint4, HLSLBaseType_Uint2, HLSLBaseType_Uint3, HLSLBaseType_Uint4,
            HLSLBaseType_Uint4, HLSLBaseType_Uint2, HLSLBaseType_Uint3, HLSLBaseType_Uint4,
            HLSLBaseType_Uint4, HLSLBaseType_Uint2, HLSLBaseType_Uint3, HLSLBaseType_Uint4
        },
    };

// Priority of the ? : operator.
const int _conditionalOpPriority = 1;

static const char* GetTypeName(const HLSLType& type)
{
    if (type.baseType == HLSLBaseType_UserDefined)
    {
        return type.typeName;
    }
    else
    {
        return baseTypeDescriptions[type.baseType].typeName;
    }
}

static const char* GetBinaryOpName(HLSLBinaryOp binaryOp)
{
    switch (binaryOp)
    {
    case HLSLBinaryOp_And:          return "&&";
    case HLSLBinaryOp_Or:           return "||";
    case HLSLBinaryOp_Add:          return "+";
    case HLSLBinaryOp_Sub:          return "-";
    case HLSLBinaryOp_Mul:          return "*";
    case HLSLBinaryOp_Div:          return "/";
    case HLSLBinaryOp_Mod:          return "%";
    case HLSLBinaryOp_Less:         return "<";
    case HLSLBinaryOp_Greater:      return ">";
    case HLSLBinaryOp_LessEqual:    return "<=";
    case HLSLBinaryOp_GreaterEqual: return ">=";
    case HLSLBinaryOp_Equal:        return "==";
    case HLSLBinaryOp_NotEqual:     return "!=";
    case HLSLBinaryOp_BitAnd:       return "&";
    case HLSLBinaryOp_BitOr:        return "|";
    case HLSLBinaryOp_BitXor:       return "^";
    case HLSLBinaryOp_Assign:       return "=";
    case HLSLBinaryOp_AddAssign:    return "+=";
    case HLSLBinaryOp_SubAssign:    return "-=";
    case HLSLBinaryOp_MulAssign:    return "*=";
    case HLSLBinaryOp_DivAssign:    return "/=";
    default:
        ASSERT(0);
        return "???";
    }
}


/*
 * 1.) Match
 * 2.) Scalar dimension promotion (scalar -> vector/matrix)
 * 3.) Conversion
 * 4.) Conversion + scalar dimension promotion
 * 5.) Truncation (vector -> scalar or lower component vector, matrix -> scalar or lower component matrix)
 * 6.) Conversion + truncation
 */    
static int GetTypeCastRank(HLSLTree * tree, const HLSLType& srcType, const HLSLType& dstType)
{
    /*if (srcType.array != dstType.array || srcType.arraySize != dstType.arraySize)
    {
        return -1;
    }*/

    if (srcType.array != dstType.array)
    {
        return -1;
    }

    if (srcType.array == true)
    {
        ASSERT(dstType.array == true);
        int srcArraySize = -1;
        int dstArraySize = -1;

        tree->GetExpressionValue(srcType.arraySize, srcArraySize);
        tree->GetExpressionValue(dstType.arraySize, dstArraySize);

        if (srcArraySize != dstArraySize) {
            return -1;
        }
    }

    if (srcType.baseType == HLSLBaseType_UserDefined && dstType.baseType == HLSLBaseType_UserDefined)
    {
        return strcmp(srcType.typeName, dstType.typeName) == 0 ? 0 : -1;
    }

    if (srcType.baseType == dstType.baseType)
    {
        if (IsSamplerType(srcType.baseType))
        {
            return srcType.samplerType == dstType.samplerType ? 0 : -1;
        }
        
        return 0;
    }

    const BaseTypeDescription& srcDesc = baseTypeDescriptions[srcType.baseType];
    const BaseTypeDescription& dstDesc = baseTypeDescriptions[dstType.baseType];
    if (srcDesc.numericType == NumericType_NaN || dstDesc.numericType == NumericType_NaN)
    {
        return -1;
    }

    // Result bits: T R R R P H C (T = truncation, R = conversion rank, P = dimension promotion, H = height promotion, C = component promotion)
    int result = _numberTypeRank[srcDesc.numericType][dstDesc.numericType] << 3;

    if (srcDesc.numDimensions == 0 && dstDesc.numDimensions > 0)
    {
        // Scalar dimension promotion
        result |= (1 << 2);
    }
    else if ((srcDesc.numDimensions == dstDesc.numDimensions && (srcDesc.numComponents > dstDesc.numComponents || srcDesc.height > dstDesc.height)) ||
             (srcDesc.numDimensions > 0 && dstDesc.numDimensions == 0))
    {
        // Truncation
        result |= (1 << 6);
    }
    else if (srcDesc.numDimensions != dstDesc.numDimensions)
    {
        // Can't convert
        return -1;
    }
    else if (srcDesc.height != dstDesc.height)
    {
        // Scalar height promotion
        result |= (1 << 1);
    }
    else if (srcDesc.numComponents != dstDesc.numComponents)
    {
        // Scalar components promotion
        result |= (1 << 0);
    }

    return result;
    
}

static bool GetFunctionCallCastRanks(HLSLTree* tree, const HLSLFunctionCall* call, const HLSLFunction* function, int* rankBuffer)
{

    if (function == NULL || function->numArguments < call->numArguments)
    {
        // Function not viable
        return false;
    }

    const HLSLExpression* expression = call->argument;
    const HLSLArgument* argument = function->argument;
   
    for (int i = 0; i < call->numArguments; ++i)
    {
        int rank = GetTypeCastRank(tree, expression->expressionType, argument->type);
        if (rank == -1)
        {
            return false;
        }

        rankBuffer[i] = rank;
        
        argument = argument->nextArgument;
        expression = expression->nextExpression;
    }

    for (int i = call->numArguments; i < function->numArguments; ++i)
    {
        if (argument->defaultValue == NULL)
        {
            // Function not viable.
            return false;
        }
    }

    return true;

}

struct CompareRanks
{
    bool operator() (const int& rank1, const int& rank2) { return rank1 > rank2; }
};

static CompareFunctionsResult CompareFunctions(HLSLTree* tree, const HLSLFunctionCall* call, const HLSLFunction* function1, const HLSLFunction* function2)
{ 

#if defined _WIN32 && !defined alloca
	int* function1Ranks = static_cast<int*>(_alloca(sizeof(int) * call->numArguments));
	int* function2Ranks = static_cast<int*>(_alloca(sizeof(int) * call->numArguments));
#else
	int* function1Ranks = static_cast<int*>(alloca(sizeof(int) * call->numArguments));
	int* function2Ranks = static_cast<int*>(alloca(sizeof(int) * call->numArguments));
#endif /** _WIN32 && ! alloca */

    const bool function1Viable = GetFunctionCallCastRanks(tree, call, function1, function1Ranks);
    const bool function2Viable = GetFunctionCallCastRanks(tree, call, function2, function2Ranks);

    // Both functions have to be viable to be able to compare them
    if (!(function1Viable && function2Viable))
    {
        if (function1Viable)
        {
            return Function1Better;
        }
        else if (function2Viable)
        {
            return Function2Better;
        }
        else
        {
            return FunctionsEqual;
        }
    }

    std::sort(function1Ranks, function1Ranks + call->numArguments, CompareRanks());
    std::sort(function2Ranks, function2Ranks + call->numArguments, CompareRanks());
    
    for (int i = 0; i < call->numArguments; ++i)
    {
        if (function1Ranks[i] < function2Ranks[i])
        {
            return Function1Better;
        }
        else if (function2Ranks[i] < function1Ranks[i])
        {
            return Function2Better;
        }
    }

//    // Dump matched function argument types
//    std::string arg1;
//    std::string arg2;
//    const HLSLArgument* argument1 = function1->argument;
//    const HLSLArgument* argument2 = function2->argument;
//    for (int i = 0; i < call->numArguments; ++i)
//    {
//        arg1 += GetTypeName(argument1->type);
//        arg1 += " ";
//        arg2 += GetTypeName(argument2->type);
//        arg2 += " ";

//        argument1 = argument1->nextArgument;
//        argument2 = argument2->nextArgument;
//    }

//    std::cout << "(" << arg1 << ") vs (" << arg2 << ")" << std::endl;


    return FunctionsEqual;

}

static bool GetBinaryOpResultType(HLSLBinaryOp binaryOp, const HLSLType& type1, const HLSLType& type2, HLSLType& result)
{

    if (type1.baseType < HLSLBaseType_FirstNumeric || type1.baseType > HLSLBaseType_LastNumeric || type1.array ||
        type2.baseType < HLSLBaseType_FirstNumeric || type2.baseType > HLSLBaseType_LastNumeric || type2.array)
    {
         return false;
    }

    if (binaryOp == HLSLBinaryOp_BitAnd || binaryOp == HLSLBinaryOp_BitOr || binaryOp == HLSLBinaryOp_BitXor)
    {
        if (type1.baseType < HLSLBaseType_FirstInteger || type1.baseType > HLSLBaseType_LastInteger)
        {
            return false;
        }
    }

    switch (binaryOp)
    {
    case HLSLBinaryOp_And:
    case HLSLBinaryOp_Or:
    case HLSLBinaryOp_Less:
    case HLSLBinaryOp_Greater:
    case HLSLBinaryOp_LessEqual:
    case HLSLBinaryOp_GreaterEqual:
    case HLSLBinaryOp_Equal:
	case HLSLBinaryOp_NotEqual:
		{
            int numComponents = std::max( baseTypeDescriptions[ type1.baseType ].numComponents, baseTypeDescriptions[ type2.baseType ].numComponents );
			result.baseType = HLSLBaseType( HLSLBaseType_Bool + numComponents - 1 );
			break;
		}
    case HLSLBinaryOp_Mod:
        result.baseType = HLSLBaseType_Int;
        break;

    default:
        result.baseType = _binaryOpTypeLookup[type1.baseType - HLSLBaseType_FirstNumeric][type2.baseType - HLSLBaseType_FirstNumeric];
        break;
    }

    result.typeName     = NULL;
    result.array        = false;
    result.arraySize    = NULL;
    result.flags        = (type1.flags & type2.flags) & HLSLTypeFlag_Const; // Propagate constness.
    
    return result.baseType != HLSLBaseType_Unknown;

}

HLSLParser::HLSLParser(Allocator* allocator, HLSLTree* tree) :
    m_userTypes(allocator),
    m_variables(allocator),
    m_functions(allocator),
    m_macros(allocator)
{
    m_numGlobals = 0;
    m_tree = tree;
}

bool HLSLParser::Accept(int token)
{
    if (m_tokenizer.GetToken() == token)
    {
       m_tokenizer.Next();
       return true;
    }
    return false;
}

bool HLSLParser::Accept(const char* token)
{
    if (m_tokenizer.GetToken() == HLSLToken_Identifier && String_Equal( token, m_tokenizer.GetIdentifier() ) )
    {
        m_tokenizer.Next();
        return true;
    }
    return false;
}

bool HLSLParser::Expect(int token)
{
    if (!Accept(token))
    {
        char want[HLSLTokenizer::s_maxIdentifier];
        m_tokenizer.GetTokenName(token, want);
        char near[HLSLTokenizer::s_maxIdentifier];
        m_tokenizer.GetTokenName(near);
        m_tokenizer.Error("Syntax error: expected '%s' near '%s'", want, near);
        return false;
    }
    return true;
}

bool HLSLParser::Expect(const char * token)
{
    if (!Accept(token))
    {
        const char * want = token;
        char near[HLSLTokenizer::s_maxIdentifier];
        m_tokenizer.GetTokenName(near);
        m_tokenizer.Error("Syntax error: expected '%s' near '%s'", want, near);
        return false;
    }
    return true;
}


bool HLSLParser::AcceptIdentifier(const char*& identifier)
{
    if (m_tokenizer.GetToken() == HLSLToken_Identifier)
    {
        identifier = m_tree->AddString( m_tokenizer.GetIdentifier() );
        m_tokenizer.Next();
        return true;
    }
    return false;
}

bool HLSLParser::ExpectIdentifier(const char*& identifier)
{
    if (!AcceptIdentifier(identifier))
    {
        char near[HLSLTokenizer::s_maxIdentifier];
        m_tokenizer.GetTokenName(near);
        m_tokenizer.Error("Syntax error: expected identifier near '%s'", near);
        identifier = "";
        return false;
    }
    return true;
}

bool HLSLParser::AcceptFloat(float& value)
{
    if (m_tokenizer.GetToken() == HLSLToken_FloatLiteral)
    {
        value = m_tokenizer.GetFloat();
        m_tokenizer.Next();
        return true;
    }
    return false;
}

bool HLSLParser::AcceptInt(int& value)
{
    if (m_tokenizer.GetToken() == HLSLToken_IntLiteral)
    {
        value = m_tokenizer.GetInt();
        m_tokenizer.Next();
        return true;
    }
    return false;
}

bool HLSLParser::ParseTopLevel(HLSLStatement*& statement)
{
    HLSLAttribute * attributes = NULL;
    ParseAttributeBlock(attributes);

    int line             = GetLineNumber();
    const char* fileName = GetFileName();
    
    HLSLType type;
    //HLSLBaseType type;
    //const char*  typeName = NULL;
    //int          typeFlags = false;

    bool doesNotExpectSemicolon = false;

    if (Accept(HLSLToken_Struct))
    {
        // Struct declaration.

        const char* structName = NULL;
        if (!ExpectIdentifier(structName))
        {
            return false;
        }
        if (FindUserDefinedType(structName) != NULL)
        {
            m_tokenizer.Error("struct %s already defined", structName);
            return false;
        }

        if (!Expect('{'))
        {
            return false;
        }

        HLSLStruct* structure = m_tree->AddNode<HLSLStruct>(fileName, line);
        structure->name = structName;

        m_userTypes.PushBack(structure);
 
        HLSLStructField* lastField = NULL;

        // Add the struct to our list of user defined types.
        while (!Accept('}'))
        {
            if (CheckForUnexpectedEndOfStream('}'))
            {
                return false;
            }
            HLSLStructField* field = NULL;
            if (!ParseFieldDeclaration(field))
            {
                return false;
            }
            ASSERT(field != NULL);
            if (lastField == NULL)
            {
                structure->field = field;
            }
            else
            {
                lastField->nextField = field;
            }
            lastField = field;
        }

        statement = structure;
    }
    else if (Accept(HLSLToken_CBuffer) || Accept(HLSLToken_TBuffer))
    {
        // cbuffer/tbuffer declaration.

        HLSLBuffer* buffer = m_tree->AddNode<HLSLBuffer>(fileName, line);
        AcceptIdentifier(buffer->name);

        // Optional register assignment.
        if (Accept(':'))
        {
            if (!Expect(HLSLToken_Register) || !Expect('(') || !ExpectIdentifier(buffer->registerName) || !Expect(')'))
            {
                return false;
            }
            // TODO: Check that we aren't re-using a register.
        }

        // Fields.
        if (!Expect('{'))
        {
            return false;
        }
        HLSLDeclaration* lastField = NULL;
        while (!Accept('}'))
        {
            if (CheckForUnexpectedEndOfStream('}'))
            {
                return false;
            }
            HLSLDeclaration* field = NULL;
            if (!ParseDeclaration(field))
            {
                m_tokenizer.Error("Expected variable declaration");
                return false;
            }
            DeclareVariable( field->name, field->type );
            field->buffer = buffer;
            if (buffer->field == NULL)
            {
                buffer->field = field;
            }
            else
            {
                lastField->nextStatement = field;
            }
            lastField = field;

            if (!Expect(';')) {
                return false;
            }
        }

        statement = buffer;
    }
    else if (AcceptType(true, type))
    {
        // Global declaration (uniform or function).
        const char* globalName = NULL;
        if (!ExpectIdentifier(globalName))
        {
            return false;
        }

        if (Accept('('))
        {
            // Function declaration.

            HLSLFunction* function = m_tree->AddNode<HLSLFunction>(fileName, line);
            function->name                  = globalName;
            function->returnType.baseType   = type.baseType;
            function->returnType.typeName   = type.typeName;
            function->attributes            = attributes;

            BeginScope();

            if (!ParseArgumentList(function->argument, function->numArguments, function->numOutputArguments))
            {
                return false;
            }

            const HLSLFunction* declaration = FindFunction(function);

            // Forward declaration
            if (Accept(';'))
            {
                // Add a function entry so that calls can refer to it
                if (!declaration)
                {
                    m_functions.PushBack( function );
                    statement = function;
                }
                EndScope();
                return true;
            }

            // Optional semantic.
            if (Accept(':') && !ExpectIdentifier(function->semantic))
            {
                return false;
            }

            if (declaration)
            {
                if (declaration->forward || declaration->statement)
                {
                    m_tokenizer.Error("Duplicate function definition");
                    return false;
                }

                const_cast<HLSLFunction*>(declaration)->forward = function;
            }
            else
            {
                m_functions.PushBack( function );
            }

            if (!Expect('{') || !ParseBlock(function->statement, function->returnType))
            {
                return false;
            }

            EndScope();

            // Note, no semi-colon at the end of a function declaration.
            statement = function;
            
            return true;
        }
        else
        {
            HLSLDeclaration * firstDeclaration = NULL;
            HLSLDeclaration * lastDeclaration = NULL;

            do {
                if (firstDeclaration != NULL) {
                    if (!ExpectIdentifier(globalName))
                    {
                        return false;
                    }
                }

                // Uniform declaration.
                HLSLDeclaration* declaration = m_tree->AddNode<HLSLDeclaration>(fileName, line);
                declaration->name            = globalName;
                declaration->type            = type;

                // Handle array syntax.
                if (Accept('['))
                {
                    if (!Accept(']'))
                    {
                        if (!ParseExpression(declaration->type.arraySize) || !Expect(']'))
                        {
                            return false;
                        }
                    }
                    declaration->type.array = true;
                }

                // Handle optional register.
                if (Accept(':'))
                {
                    // @@ Currently we support either a semantic or a register, but not both.
                    if (AcceptIdentifier(declaration->semantic)) {
                        // nothing
                    }
                    else if (!Expect(HLSLToken_Register) || !Expect('(') || !ExpectIdentifier(declaration->registerName) || !Expect(')'))
                    {
                        return false;
                    }
                }

                DeclareVariable( globalName, declaration->type );

                if (!ParseDeclarationAssignment(declaration))
                {
                    return false;
                }
                if (firstDeclaration == NULL) firstDeclaration = declaration;
                if (lastDeclaration != NULL) lastDeclaration->nextDeclaration = declaration;
                lastDeclaration = declaration;

            } while(Accept(','));

            statement = firstDeclaration;
        }
    }
    else if (ParseTechnique(statement)) {
        doesNotExpectSemicolon = true;
    }
    else if (ParsePipeline(statement)) {
        doesNotExpectSemicolon = true;
    }
    else if (ParseStage(statement)) {
        doesNotExpectSemicolon = true;
    }

    if (statement != NULL) {
        statement->attributes = attributes;
    }

    return doesNotExpectSemicolon || Expect(';');
}

bool HLSLParser::ParseStatementOrBlock(HLSLStatement*& firstStatement, const HLSLType& returnType, bool scoped/*=true*/)
{
    if (scoped)
    {
        BeginScope();
    }
    if (Accept('{'))
    {
        if (!ParseBlock(firstStatement, returnType))
        {
            return false;
        }
    }
    else
    {
        if (!ParseStatement(firstStatement, returnType))
        {
            return false;
        }
    }
    if (scoped)
    {
        EndScope();
    }
    return true;
}

bool HLSLParser::ParseBlock(HLSLStatement*& firstStatement, const HLSLType& returnType)
{
    HLSLStatement* lastStatement = NULL;
    while (!Accept('}'))
    {
        if (CheckForUnexpectedEndOfStream('}'))
        {
            return false;
        }
        HLSLStatement* statement = NULL;
        if (!ParseStatement(statement, returnType))
        {
            return false;
        }
        if (statement != NULL)
        {
            if (firstStatement == NULL)
            {
                firstStatement = statement;
            }
            else
            {
                lastStatement->nextStatement = statement;
            }
            lastStatement = statement;
            while (lastStatement->nextStatement) lastStatement = lastStatement->nextStatement;
        }
    }
    return true;
}

bool HLSLParser::ParseStatement(HLSLStatement*& statement, const HLSLType& returnType)
{
    const char* fileName = GetFileName();
    int         line     = GetLineNumber();

    // Empty statements.
    if (Accept(';'))
    {
        return true;
    }

    HLSLAttribute * attributes = NULL;
    ParseAttributeBlock(attributes);    // @@ Leak if not assigned to node? 

#if 0 // @@ Work in progress.
    // Static statements: @if only for now.
    if (Accept('@'))
    {
        if (Accept(HLSLToken_If))
        {
            //HLSLIfStatement* ifStatement = m_tree->AddNode<HLSLIfStatement>(fileName, line);
            //ifStatement->isStatic = true;
            //ifStatement->attributes = attributes;
            
            HLSLExpression * condition = NULL;
            
            m_allowUndeclaredIdentifiers = true;    // Not really correct... better to push to stack?
            if (!Expect('(') || !ParseExpression(condition) || !Expect(')'))
            {
                m_allowUndeclaredIdentifiers = false;
                return false;
            }
            m_allowUndeclaredIdentifiers = false;
            
            if ((condition->expressionType.flags & HLSLTypeFlag_Const) == 0)
            {
                m_tokenizer.Error("Syntax error: @if condition is not constant");
                return false;
            }
            
            int conditionValue;
            if (!m_tree->GetExpressionValue(condition, conditionValue))
            {
                m_tokenizer.Error("Syntax error: Cannot evaluate @if condition");
                return false;
            }
            
            if (!conditionValue) m_disableSemanticValidation = true;
            
            HLSLStatement * ifStatements = NULL;
            HLSLStatement * elseStatements = NULL;
            
            if (!ParseStatementOrBlock(ifStatements, returnType, /*scoped=*/false))
            {
                m_disableSemanticValidation = false;
                return false;
            }
            if (Accept(HLSLToken_Else))
            {
                if (conditionValue) m_disableSemanticValidation = true;
                
                if (!ParseStatementOrBlock(elseStatements, returnType, /*scoped=*/false))
                {
                    m_disableSemanticValidation = false;
                    return false;
                }
            }
            m_disableSemanticValidation = false;
            
            if (conditionValue) statement = ifStatements;
            else statement = elseStatements;
            
            // @@ Free the pruned statements?
            
            return true;
        }
        else {
            m_tokenizer.Error("Syntax error: unexpected token '@'");
        }
    }
#endif
    
    // If statement.
    if (Accept(HLSLToken_If))
    {
        HLSLIfStatement* ifStatement = m_tree->AddNode<HLSLIfStatement>(fileName, line);
        ifStatement->attributes = attributes;
        if (!Expect('(') || !ParseExpression(ifStatement->condition) || !Expect(')'))
        {
            return false;
        }
        statement = ifStatement;
        if (!ParseStatementOrBlock(ifStatement->statement, returnType))
        {
            return false;
        }
        if (Accept(HLSLToken_Else))
        {
            return ParseStatementOrBlock(ifStatement->elseStatement, returnType);
        }
        return true;
    }
    
    // For statement.
    if (Accept(HLSLToken_For))
    {
        HLSLForStatement* forStatement = m_tree->AddNode<HLSLForStatement>(fileName, line);
        forStatement->attributes = attributes;
        if (!Expect('('))
        {
            return false;
        }
        BeginScope();
        if (!ParseDeclaration(forStatement->initialization) && !ParseExpression(forStatement->initializationWithoutType))
        {
            return false;
        }
        if (!Expect(';'))
        {
            return false;
        }
        ParseExpression(forStatement->condition);
        if (!Expect(';'))
        {
            return false;
        }
        ParseExpression(forStatement->increment);
        if (!Expect(')'))
        {
            return false;
        }
        statement = forStatement;
        if (!ParseStatementOrBlock(forStatement->statement, returnType))
        {
            return false;
        }
        EndScope();
        return true;
    }

    // While statement.
    if (Accept(HLSLToken_While))
    {
        HLSLWhileStatement* whileStatement = m_tree->AddNode<HLSLWhileStatement>(fileName, line);
        whileStatement->attributes = attributes;
        if (!Expect('(') || !ParseExpression(whileStatement->condition) || !Expect(')'))
        {
            return false;
        }
        statement = whileStatement;
        if (!ParseStatementOrBlock(whileStatement->statement, returnType))
        {
            return false;
        }
        return true;
    }


    if (attributes != NULL)
    {
        // @@ Error. Unexpected attribute. We only support attributes associated to if and for statements.
    }

    // Block statement.
    if (Accept('{'))
    {
        HLSLBlockStatement* blockStatement = m_tree->AddNode<HLSLBlockStatement>(fileName, line);
        statement = blockStatement;
        BeginScope();
        bool success = ParseBlock(blockStatement->statement, returnType);
        EndScope();
        return success;
    }

    // Discard statement.
    if (Accept(HLSLToken_Discard))
    {
        HLSLDiscardStatement* discardStatement = m_tree->AddNode<HLSLDiscardStatement>(fileName, line);
        statement = discardStatement;
        return Expect(';');
    }

    // Break statement.
    if (Accept(HLSLToken_Break))
    {
        HLSLBreakStatement* breakStatement = m_tree->AddNode<HLSLBreakStatement>(fileName, line);
        statement = breakStatement;
        return Expect(';');
    }

    // Continue statement.
    if (Accept(HLSLToken_Continue))
    {
        HLSLContinueStatement* continueStatement = m_tree->AddNode<HLSLContinueStatement>(fileName, line);
        statement = continueStatement;
        return Expect(';');
    }

    // Return statement
    if (Accept(HLSLToken_Return))
    {
        HLSLReturnStatement* returnStatement = m_tree->AddNode<HLSLReturnStatement>(fileName, line);
        if (!Accept(';') && !ParseExpression(returnStatement->expression))
        {
            return false;
        }
        // Check that the return expression can be cast to the return type of the function.
        HLSLType voidType(HLSLBaseType_Void);
        if (!CheckTypeCast(returnStatement->expression ? returnStatement->expression->expressionType : voidType, returnType))
        {
            return false;
        }

        statement = returnStatement;
        return Expect(';');
    }

    HLSLDeclaration* declaration = NULL;
    HLSLExpression*  expression  = NULL;

    if (ParseDeclaration(declaration))
    {
        statement = declaration;
    }
    else if (ParseExpression(expression))
    {
        HLSLExpressionStatement* expressionStatement;
        expressionStatement = m_tree->AddNode<HLSLExpressionStatement>(fileName, line);
        expressionStatement->expression = expression;
        statement = expressionStatement;
    }

    // Some statements are separated by a colon instead of a semicolon
    if (Accept(',')) {
        return true;
    }

    return Expect(';');
}


// IC: This is only used in block statements, or within control flow statements. So, it doesn't support semantics or layout modifiers.
// @@ We should add suport for semantics for inline input/output declarations.
bool HLSLParser::ParseDeclaration(HLSLDeclaration*& declaration)
{
    const char* fileName    = GetFileName();
    int         line        = GetLineNumber();

    HLSLType type;
    if (!AcceptType(/*allowVoid=*/false, type))
    {
        return false;
    }

    bool allowUnsizedArray = true;  // @@ Really?

    HLSLDeclaration * firstDeclaration = NULL;
    HLSLDeclaration * lastDeclaration = NULL;

    do {
        const char* name;
        if (!ExpectIdentifier(name))
        {
            // TODO: false means we didn't accept a declaration and we had an error!
            return false;
        }
        // Handle array syntax.
        if (Accept('['))
        {
            type.array = true;
            // Optionally allow no size to the specified for the array.
            if (Accept(']') && allowUnsizedArray)
            {
                return true;
            }
            if (!ParseExpression(type.arraySize) || !Expect(']'))
            {
                return false;
            }
        }

        HLSLDeclaration * declaration2 = m_tree->AddNode<HLSLDeclaration>(fileName, line);
        declaration2->type  = type;
        declaration2->name  = name;

        DeclareVariable( declaration2->name, declaration2->type );

        // Handle option assignment of the declared variables(s).
        if (!ParseDeclarationAssignment( declaration2 )) {
            return false;
        }

        if (firstDeclaration == NULL) firstDeclaration = declaration2;
        if (lastDeclaration != NULL) lastDeclaration->nextDeclaration = declaration2;
        lastDeclaration = declaration2;

    } while(Accept(','));

    declaration = firstDeclaration;

    return true;
}

bool HLSLParser::ParseDeclarationAssignment(HLSLDeclaration* declaration)
{
    if (Accept('='))
    {
        // Handle array initialization syntax.
        if (declaration->type.array)
        {
            int numValues = 0;
            if (!Expect('{') || !ParseExpressionList('}', true, declaration->assignment, numValues))
            {
                return false;
            }
        }
        else if (IsSamplerType(declaration->type.baseType))
        {
            if (!ParseSamplerState(declaration->assignment))
            {
                return false;
            }
        }
        else if (!ParseExpression(declaration->assignment))
        {
            return false;
        }
    }
    return true;
}

bool HLSLParser::ParseFieldDeclaration(HLSLStructField*& field)
{
    field = m_tree->AddNode<HLSLStructField>( GetFileName(), GetLineNumber() );
    if (!ExpectDeclaration(false, field->type, field->name))
    {
        return false;
    }
    // Handle optional semantics.
    if (Accept(':'))
    {
        if (!ExpectIdentifier(field->semantic))
        {
            return false;
        }
    }
    return Expect(';');
}

// @@ Add support for packoffset to general declarations.
/*bool HLSLParser::ParseBufferFieldDeclaration(HLSLBufferField*& field)
{
    field = m_tree->AddNode<HLSLBufferField>( GetFileName(), GetLineNumber() );
    if (AcceptDeclaration(false, field->type, field->name))
    {
        // Handle optional packoffset.
        if (Accept(':'))
        {
            if (!Expect("packoffset"))
            {
                return false;
            }
            const char* constantName = NULL;
            const char* swizzleMask  = NULL;
            if (!Expect('(') || !ExpectIdentifier(constantName) || !Expect('.') || !ExpectIdentifier(swizzleMask) || !Expect(')'))
            {
                return false;
            }
        }
        return Expect(';');
    }
    return false;
}*/

bool HLSLParser::CheckTypeCast(const HLSLType& srcType, const HLSLType& dstType)
{
    if (GetTypeCastRank(m_tree, srcType, dstType) == -1)
    {
        const char* srcTypeName = GetTypeName(srcType);
        const char* dstTypeName = GetTypeName(dstType);
        m_tokenizer.Error("Cannot implicitly convert from '%s' to '%s'", srcTypeName, dstTypeName);
        return false;
    }
    return true;
}

bool HLSLParser::ParseExpression(HLSLExpression*& expression)
{
    if (!ParseBinaryExpression(0, expression))
    {
        return false;
    }

    HLSLBinaryOp assignOp;
    if (AcceptAssign(assignOp))
    {
        HLSLExpression* expression2 = NULL;
        if (!ParseExpression(expression2))
        {
            return false;
        }
        HLSLBinaryExpression* binaryExpression = m_tree->AddNode<HLSLBinaryExpression>(expression->fileName, expression->line);
        binaryExpression->binaryOp = assignOp;
        binaryExpression->expression1 = expression;
        binaryExpression->expression2 = expression2;
        // This type is not strictly correct, since the type should be a reference.
        // However, for our usage of the types it should be sufficient.
        binaryExpression->expressionType = expression->expressionType;

        if (!CheckTypeCast(expression2->expressionType, expression->expressionType))
        {
            const char* srcTypeName = GetTypeName(expression2->expressionType);
            const char* dstTypeName = GetTypeName(expression->expressionType);
            m_tokenizer.Error("Cannot implicitly convert from '%s' to '%s'", srcTypeName, dstTypeName);
            return false;
        }

        expression = binaryExpression;
    }

    return true;
}

bool HLSLParser::AcceptBinaryOperator(int priority, HLSLBinaryOp& binaryOp)
{
    int token = m_tokenizer.GetToken();
    switch (token)
    {
    case HLSLToken_AndAnd:          binaryOp = HLSLBinaryOp_And;          break;
    case HLSLToken_BarBar:          binaryOp = HLSLBinaryOp_Or;           break;
    case '+':                       binaryOp = HLSLBinaryOp_Add;          break;
    case '-':                       binaryOp = HLSLBinaryOp_Sub;          break;
    case '*':                       binaryOp = HLSLBinaryOp_Mul;          break;
    case '/':                       binaryOp = HLSLBinaryOp_Div;          break;
    case '%':                       binaryOp = HLSLBinaryOp_Mod;          break;
    case '<':                       binaryOp = HLSLBinaryOp_Less;         break;
    case '>':                       binaryOp = HLSLBinaryOp_Greater;      break;
    case HLSLToken_LessEqual:       binaryOp = HLSLBinaryOp_LessEqual;    break;
    case HLSLToken_GreaterEqual:    binaryOp = HLSLBinaryOp_GreaterEqual; break;
    case HLSLToken_EqualEqual:      binaryOp = HLSLBinaryOp_Equal;        break;
    case HLSLToken_NotEqual:        binaryOp = HLSLBinaryOp_NotEqual;     break;
    case '&':                       binaryOp = HLSLBinaryOp_BitAnd;       break;
    case '|':                       binaryOp = HLSLBinaryOp_BitOr;        break;
    case '^':                       binaryOp = HLSLBinaryOp_BitXor;       break;
    default:
        return false;
    }
    if (_binaryOpPriority[binaryOp] > priority)
    {
        m_tokenizer.Next();
        return true;
    }
    return false;
}

bool HLSLParser::AcceptUnaryOperator(bool pre, HLSLUnaryOp& unaryOp)
{
    int token = m_tokenizer.GetToken();
    if (token == HLSLToken_PlusPlus)
    {
        unaryOp = pre ? HLSLUnaryOp_PreIncrement : HLSLUnaryOp_PostIncrement;
    }
    else if (token == HLSLToken_MinusMinus)
    {
        unaryOp = pre ? HLSLUnaryOp_PreDecrement : HLSLUnaryOp_PostDecrement;
    }
    else if (pre && token == '-')
    {
        unaryOp = HLSLUnaryOp_Negative;
    }
    else if (pre && token == '+')
    {
        unaryOp = HLSLUnaryOp_Positive;
    }
    else if (pre && token == '!')
    {
        unaryOp = HLSLUnaryOp_Not;
    }
    else if (pre && token == '~')
    {
        unaryOp = HLSLUnaryOp_Not;
    }
    else
    {
        return false;
    }
    m_tokenizer.Next();
    return true;
}

bool HLSLParser::AcceptAssign(HLSLBinaryOp& binaryOp)
{
    if (Accept('='))
    {
        binaryOp = HLSLBinaryOp_Assign;
    }
    else if (Accept(HLSLToken_PlusEqual))
    {
        binaryOp = HLSLBinaryOp_AddAssign;
    }
    else if (Accept(HLSLToken_MinusEqual))
    {
        binaryOp = HLSLBinaryOp_SubAssign;
    }     
    else if (Accept(HLSLToken_TimesEqual))
    {
        binaryOp = HLSLBinaryOp_MulAssign;
    }     
    else if (Accept(HLSLToken_DivideEqual))
    {
        binaryOp = HLSLBinaryOp_DivAssign;
    }     
    else
    {
        return false;
    }
    return true;
}

bool HLSLParser::ParseBinaryExpression(int priority, HLSLExpression*& expression)
{
    const char* fileName = GetFileName();
    int         line     = GetLineNumber();

    char needsExpressionEndChar;

    if (!ParseTerminalExpression(expression, needsExpressionEndChar))
    {
        return false;
    }

	// reset priority cause openned parenthesis
    if( needsExpressionEndChar != 0 )
		priority = 0;

    bool acceptBinaryOp = false;
    HLSLBinaryOp binaryOp;
    while (1)
    {
        if (acceptBinaryOp || AcceptBinaryOperator(priority, binaryOp))
        {
            acceptBinaryOp = false;
            HLSLExpression* expression2 = NULL;
            ASSERT( binaryOp < sizeof(_binaryOpPriority) / sizeof(int) );
            if (!ParseBinaryExpression(_binaryOpPriority[binaryOp], expression2))
            {
                return false;
            }
            HLSLBinaryExpression* binaryExpression = m_tree->AddNode<HLSLBinaryExpression>(fileName, line);
            binaryExpression->binaryOp    = binaryOp;
            binaryExpression->expression1 = expression;
            binaryExpression->expression2 = expression2;
            if (!GetBinaryOpResultType( binaryOp, expression->expressionType, expression2->expressionType, binaryExpression->expressionType ))
            {
                const char* typeName1 = GetTypeName( binaryExpression->expression1->expressionType );
                const char* typeName2 = GetTypeName( binaryExpression->expression2->expressionType );
                m_tokenizer.Error("binary '%s' : no global operator found which takes types '%s' and '%s' (or there is no acceptable conversion)",
                    GetBinaryOpName(binaryOp), typeName1, typeName2);

                return false;
            }
            
            // Propagate constness.
            binaryExpression->expressionType.flags = (expression->expressionType.flags | expression2->expressionType.flags) & HLSLTypeFlag_Const;
            
            expression = binaryExpression;
        }
        else if (_conditionalOpPriority > priority && Accept('?'))
        {

            HLSLConditionalExpression* conditionalExpression = m_tree->AddNode<HLSLConditionalExpression>(fileName, line);
            conditionalExpression->condition = expression;
            
            HLSLExpression* expression1 = NULL;
            HLSLExpression* expression2 = NULL;
            if (!ParseBinaryExpression(_conditionalOpPriority, expression1) || !Expect(':') || !ParseBinaryExpression(_conditionalOpPriority, expression2))
            {
                return false;
            }

            // Make sure both cases have compatible types.
            if (GetTypeCastRank(m_tree, expression1->expressionType, expression2->expressionType) == -1)
            {
                const char* srcTypeName = GetTypeName(expression2->expressionType);
                const char* dstTypeName = GetTypeName(expression1->expressionType);
                m_tokenizer.Error("':' no possible conversion from '%s' to '%s'", srcTypeName, dstTypeName);
                return false;
            }

            conditionalExpression->trueExpression  = expression1;
            conditionalExpression->falseExpression = expression2;
            conditionalExpression->expressionType  = expression1->expressionType;

            expression = conditionalExpression;
        }
        else
        {
            break;
        }

        //  First: try if next is a binary op before exiting the loop
        if (AcceptBinaryOperator(priority, binaryOp))
        {
            acceptBinaryOp = true;
            continue;
        }

        if( needsExpressionEndChar != 0 )
        {
            if( !Expect(needsExpressionEndChar) )
                return false;
            needsExpressionEndChar = 0;
        }
    }

    return needsExpressionEndChar == 0 || Expect(needsExpressionEndChar);
}

bool HLSLParser::ParsePartialConstructor(HLSLExpression*& expression, HLSLBaseType type, const char* typeName)
{
    const char* fileName = GetFileName();
    int         line     = GetLineNumber();

    HLSLConstructorExpression* constructorExpression = m_tree->AddNode<HLSLConstructorExpression>(fileName, line);
    constructorExpression->type.baseType = type;
    constructorExpression->type.typeName = typeName;
    int numArguments = 0;
    if (!ParseExpressionList(')', false, constructorExpression->argument, numArguments))
    {
        return false;
    }    
    constructorExpression->expressionType = constructorExpression->type;
    constructorExpression->expressionType.flags = HLSLTypeFlag_Const;
    expression = constructorExpression;
    return true;
}

bool HLSLParser::ParseTerminalExpression(HLSLExpression*& expression, char& needsExpressionEndChar)
{
    const char* fileName = GetFileName();
    int         line     = GetLineNumber();

    needsExpressionEndChar = 0;

    HLSLUnaryOp unaryOp;
    if (AcceptUnaryOperator(true, unaryOp))
    {
        HLSLUnaryExpression* unaryExpression = m_tree->AddNode<HLSLUnaryExpression>(fileName, line);
        unaryExpression->unaryOp = unaryOp;
        if (!ParseTerminalExpression(unaryExpression->expression, needsExpressionEndChar))
        {
            return false;
        }
        if (unaryOp == HLSLUnaryOp_BitNot)
        {
            if (unaryExpression->expression->expressionType.baseType < HLSLBaseType_FirstInteger || 
                unaryExpression->expression->expressionType.baseType > HLSLBaseType_LastInteger)
            {
                const char * typeName = GetTypeName(unaryExpression->expression->expressionType);
                m_tokenizer.Error("unary '~' : no global operator found which takes type '%s' (or there is no acceptable conversion)", typeName);
                return false;
            }
        }
        if (unaryOp == HLSLUnaryOp_Not)
        {
            if (unaryExpression->expression->expressionType.baseType != HLSLBaseType_Bool)
            {
                // Insert a cast to bool
                HLSLCastingExpression* castingExpression = m_tree->AddNode<HLSLCastingExpression>(fileName, line);
                castingExpression->type.baseType = HLSLBaseType_Bool;
                castingExpression->expression = unaryExpression->expression;
                castingExpression->expressionType.baseType = HLSLBaseType_Bool;

                unaryExpression->expression = castingExpression;
                expression = unaryExpression;
            }

            unaryExpression->expressionType = HLSLType(HLSLBaseType_Bool);
            
            // Propagate constness.
            unaryExpression->expressionType.flags = unaryExpression->expression->expressionType.flags & HLSLTypeFlag_Const;
        }

        if (unaryOp == HLSLUnaryOp_Negative || unaryOp == HLSLUnaryOp_Positive)
        {
            if (unaryExpression->expression->expressionType.baseType <= HLSLBaseType_Bool4 &&
                unaryExpression->expression->expressionType.baseType >= HLSLBaseType_Bool)
            {
                // Insert a cast bool to int
                int numComponents = baseTypeDescriptions[ unaryExpression->expression->expressionType.baseType ].numComponents;
                HLSLBaseType baseType = HLSLBaseType( HLSLBaseType_Int + numComponents - 1 );

                unaryExpression->expressionType = unaryExpression->expression->expressionType;

                HLSLCastingExpression* castingExpression = m_tree->AddNode<HLSLCastingExpression>(fileName, line);
                castingExpression->type.baseType = baseType;
                castingExpression->expression = unaryExpression->expression;
                castingExpression->expressionType.baseType = baseType;

                unaryExpression->expression = castingExpression;
                expression = unaryExpression;
            }
            else
            {
                unaryExpression->expressionType = unaryExpression->expression->expressionType;
            }
        }
        else
        {
            unaryExpression->expressionType = unaryExpression->expression->expressionType;
        }
        expression = unaryExpression;
        return true;
    }
    
    // Expressions inside parenthesis or casts.
    char expressionEndChar = 0;
    if (Accept('('))
    {
        expressionEndChar = ')';
    }
    else if (Accept('{'))
    {
        expressionEndChar = '}';
    }


    if (expressionEndChar != 0)
    {
        // Check for a casting operator.
        HLSLType type;
        if (AcceptType(false, type))
        {
            // This is actually a type constructor like (float2(...
            if (Accept('('))
            {
                needsExpressionEndChar = expressionEndChar;
                return ParsePartialConstructor(expression, type.baseType, type.typeName);
            }
            HLSLCastingExpression* castingExpression = m_tree->AddNode<HLSLCastingExpression>(fileName, line);
            castingExpression->type = type;
            expression = castingExpression;
            castingExpression->expressionType = type;
            return Expect(')') && ParseExpression(castingExpression->expression);
        }
        
        int numArguments = 0;
        if (!ParseExpressionList(expressionEndChar, false, expression, numArguments))
        {
            return false;
        }

        if (expressionEndChar == ')')
        {
            // Allows comma separated expression lists, HLSL compiler keeps the last one
            HLSLExpression* lastExpression = expression;
            while(lastExpression->nextExpression != NULL) {
                lastExpression = lastExpression->nextExpression;
            }
        }
    }
    else
    {
        // Terminal values.
        float fValue = 0.0f;
        int   iValue = 0;
        
        if (AcceptFloat(fValue))
        {
            HLSLLiteralExpression* literalExpression = m_tree->AddNode<HLSLLiteralExpression>(fileName, line);
            literalExpression->type   = HLSLBaseType_Float;
            literalExpression->fValue = fValue;
            literalExpression->expressionType.baseType = literalExpression->type;
            literalExpression->expressionType.flags = HLSLTypeFlag_Const;
            expression = literalExpression;
            return true;
        }
        else if (AcceptInt(iValue))
        {
            HLSLLiteralExpression* literalExpression = m_tree->AddNode<HLSLLiteralExpression>(fileName, line);
            literalExpression->type   = HLSLBaseType_Int;
            literalExpression->iValue = iValue;
            literalExpression->expressionType.baseType = literalExpression->type;
            literalExpression->expressionType.flags = HLSLTypeFlag_Const;
            expression = literalExpression;
            return true;
        }
        else if (Accept(HLSLToken_True))
        {
            HLSLLiteralExpression* literalExpression = m_tree->AddNode<HLSLLiteralExpression>(fileName, line);
            literalExpression->type   = HLSLBaseType_Bool;
            literalExpression->bValue = true;
            literalExpression->expressionType.baseType = literalExpression->type;
            literalExpression->expressionType.flags = HLSLTypeFlag_Const;
            expression = literalExpression;
            return true;
        }
        else if (Accept(HLSLToken_False))
        {
            HLSLLiteralExpression* literalExpression = m_tree->AddNode<HLSLLiteralExpression>(fileName, line);
            literalExpression->type   = HLSLBaseType_Bool;
            literalExpression->bValue = false;
            literalExpression->expressionType.baseType = literalExpression->type;
            literalExpression->expressionType.flags = HLSLTypeFlag_Const;
            expression = literalExpression;
            return true;
        }

        // Type constructor.
        HLSLType type;
        if (AcceptType(/*allowVoid=*/false, type))
        {
            Expect('(');
            if (!ParsePartialConstructor(expression, type.baseType, type.typeName))
            {
                return false;
            }
        }
        else
        {
            HLSLIdentifierExpression* identifierExpression = m_tree->AddNode<HLSLIdentifierExpression>(fileName, line);
            if (!ExpectIdentifier(identifierExpression->name))
            {
                return false;
            }

            bool undeclaredIdentifier = false;

            const HLSLType* identifierType = FindVariable(identifierExpression->name, identifierExpression->global);
            if (identifierType != NULL)
            {
                identifierExpression->expressionType = *identifierType;
            }
            else
            {
                if (GetIsFunction(identifierExpression->name))
                {
                    // Functions are always global scope.
                    identifierExpression->global = true;
                }
                else
                {
                    undeclaredIdentifier = true;
                }
            }

            if (undeclaredIdentifier)
            {
                if (m_allowUndeclaredIdentifiers)
                {
                    HLSLLiteralExpression* literalExpression = m_tree->AddNode<HLSLLiteralExpression>(fileName, line);
                    literalExpression->bValue = false;
                    literalExpression->type = HLSLBaseType_Bool;
                    literalExpression->expressionType.baseType = literalExpression->type;
                    literalExpression->expressionType.flags = HLSLTypeFlag_Const;
                    expression = literalExpression;
                }
                else
                {
                    m_tokenizer.Error("Undeclared identifier '%s'", identifierExpression->name);
                    return false;
                }
            }
            else {
                expression = identifierExpression;
            }
        }
    }

    bool done = false;
    while (!done)
    {
        done = true;

        // Post fix unary operator
        HLSLUnaryOp unaryOp2;
        while (AcceptUnaryOperator(false, unaryOp2))
        {
            HLSLUnaryExpression* unaryExpression = m_tree->AddNode<HLSLUnaryExpression>(fileName, line);
            unaryExpression->unaryOp = unaryOp2;
            unaryExpression->expression = expression;
            unaryExpression->expressionType = unaryExpression->expression->expressionType;
            expression = unaryExpression;
            done = false;
        }

        // Member access operator.
        while (Accept('.'))
        {
            HLSLMemberAccess* memberAccess = m_tree->AddNode<HLSLMemberAccess>(fileName, line);
            memberAccess->object = expression;
            if (!ExpectIdentifier(memberAccess->field))
            {
                return false;
            }
            if (!GetMemberType( expression->expressionType, memberAccess))
            {
                m_tokenizer.Error("Couldn't access '%s'", memberAccess->field);
                return false;
            }
            expression = memberAccess;
            done = false;
        }

        // Handle array access.
        while (Accept('['))
        {
            HLSLArrayAccess* arrayAccess = m_tree->AddNode<HLSLArrayAccess>(fileName, line);
            arrayAccess->array = expression;
            if (!ParseExpression(arrayAccess->index) || !Expect(']'))
            {
                return false;
            }

            if (expression->expressionType.array)
            {
                arrayAccess->expressionType = expression->expressionType;
                arrayAccess->expressionType.array     = false;
                arrayAccess->expressionType.arraySize = NULL;
            }
            else
            {
                switch (expression->expressionType.baseType)
                {
                case HLSLBaseType_Float2:
                case HLSLBaseType_Float3:
                case HLSLBaseType_Float4:
                    arrayAccess->expressionType.baseType = HLSLBaseType_Float;
                    break;
                case HLSLBaseType_Float4x4:
                case HLSLBaseType_Float3x4:
                case HLSLBaseType_Float2x4:
                    arrayAccess->expressionType.baseType = HLSLBaseType_Float4;
                    break;
                case HLSLBaseType_Float4x3:
                case HLSLBaseType_Float3x3:
                case HLSLBaseType_Float2x3:
                    arrayAccess->expressionType.baseType = HLSLBaseType_Float3;
                    break;
                case HLSLBaseType_Float4x2:
                case HLSLBaseType_Float3x2:
                case HLSLBaseType_Float2x2:
                    arrayAccess->expressionType.baseType = HLSLBaseType_Float2;
                    break;
                case HLSLBaseType_Bool2:
                case HLSLBaseType_Bool3:
                case HLSLBaseType_Bool4:
                    arrayAccess->expressionType.baseType = HLSLBaseType_Bool;
                    break;
                case HLSLBaseType_Int2:
                case HLSLBaseType_Int3:
                case HLSLBaseType_Int4:
                    arrayAccess->expressionType.baseType = HLSLBaseType_Int;
                    break;
                case HLSLBaseType_Uint2:
                case HLSLBaseType_Uint3:
                case HLSLBaseType_Uint4:
                    arrayAccess->expressionType.baseType = HLSLBaseType_Uint;
                    break;
                default:
                    m_tokenizer.Error("array, matrix, vector, or indexable object type expected in index expression");
                    return false;
                }
            }

            expression = arrayAccess;
            done = false;
        }

        // Handle function calls. Note, HLSL functions aren't like C function
        // pointers -- we can only directly call on an identifier, not on an
        // expression.
        if (Accept('('))
        {
            HLSLFunctionCall* functionCall = m_tree->AddNode<HLSLFunctionCall>(fileName, line);
            done = false;
            if (!ParseExpressionList(')', false, functionCall->argument, functionCall->numArguments))
            {
                return false;
            }

            if (expression->nodeType != HLSLNodeType_IdentifierExpression)
            {
                m_tokenizer.Error("Expected function identifier");
                return false;
            }

            const HLSLIdentifierExpression* identifierExpression = static_cast<const HLSLIdentifierExpression*>(expression);
            const HLSLFunction* function = MatchFunctionCall( functionCall, identifierExpression->name );
            if (function == NULL)
            {
                return false;
            }

            functionCall->function = function;
            functionCall->expressionType = function->returnType;
            expression = functionCall;
        }

    }
    return true;

}

bool HLSLParser::ParseExpressionList(int endToken, bool allowEmptyEnd, HLSLExpression*& firstExpression, int& numExpressions)
{
    numExpressions = 0;
    HLSLExpression* lastExpression = NULL;
    while (!Accept(endToken))
    {
        if (CheckForUnexpectedEndOfStream(endToken))
        {
            return false;
        }
        if (numExpressions > 0 && !Expect(','))
        {
            return false;
        }
        // It is acceptable for the final element in the initialization list to
        // have a trailing comma in some cases, like array initialization such as {1, 2, 3,}
        if (allowEmptyEnd && Accept(endToken))
        {
            break;
        }
        HLSLExpression* expression = NULL;
        if (!ParseExpression(expression))
        {
            return false;
        }
        if (firstExpression == NULL)
        {
            firstExpression = expression;
        }
        else
        {
            lastExpression->nextExpression = expression;
        }
        lastExpression = expression;
        ++numExpressions;
    }
    return true;
}

bool HLSLParser::ParseArgumentList(HLSLArgument*& firstArgument, int& numArguments, int& numOutputArguments)
{
    const char* fileName = GetFileName();
    int         line     = GetLineNumber();
        
    HLSLArgument* lastArgument = NULL;
    numArguments = 0;

    while (!Accept(')'))
    {
        if (CheckForUnexpectedEndOfStream(')'))
        {
            return false;
        }
        if (numArguments > 0 && !Expect(','))
        {
            return false;
        }

        HLSLArgument* argument = m_tree->AddNode<HLSLArgument>(fileName, line);

        if (Accept(HLSLToken_Uniform))     { argument->modifier = HLSLArgumentModifier_Uniform; }
        else if (Accept(HLSLToken_In))     { argument->modifier = HLSLArgumentModifier_In;      }
        else if (Accept(HLSLToken_Out))    { argument->modifier = HLSLArgumentModifier_Out;     }
        else if (Accept(HLSLToken_InOut))  { argument->modifier = HLSLArgumentModifier_Inout;   }
        else if (Accept(HLSLToken_Const))  { argument->modifier = HLSLArgumentModifier_Const;   }

        if (!ExpectDeclaration(/*allowUnsizedArray=*/true, argument->type, argument->name))
        {
            return false;
        }

        DeclareVariable( argument->name, argument->type );

        // Optional semantic.
        if (Accept(':') && !ExpectIdentifier(argument->semantic))
        {
            return false;
        }

        if (Accept('=') && !ParseExpression(argument->defaultValue))
        {
            // @@ Print error!
            return false;
        }

        if (lastArgument != NULL)
        {
            lastArgument->nextArgument = argument;
        }
        else
        {
            firstArgument = argument;
        }
        lastArgument = argument;

        ++numArguments;
        if (argument->modifier == HLSLArgumentModifier_Out || argument->modifier == HLSLArgumentModifier_Inout)
        {
            ++numOutputArguments;
        }
    }
    return true;
}


bool HLSLParser::ParseSamplerState(HLSLExpression*& expression)
{
    if (!Expect(HLSLToken_SamplerState))
    {
        return false;
    }

    const char* fileName = GetFileName();
    int         line     = GetLineNumber();

    HLSLSamplerState* samplerState = m_tree->AddNode<HLSLSamplerState>(fileName, line);

    if (!Expect('{'))
    {
        return false;
    }

    HLSLStateAssignment* lastStateAssignment = NULL;

    // Parse state assignments.
    while (!Accept('}'))
    {
        if (CheckForUnexpectedEndOfStream('}'))
        {
            return false;
        }

        HLSLStateAssignment* stateAssignment = NULL;
        if (!ParseStateAssignment(stateAssignment, /*isSamplerState=*/true, /*isPipeline=*/false))
        {
            return false;
        }
        ASSERT(stateAssignment != NULL);
        if (lastStateAssignment == NULL)
        {
            samplerState->stateAssignments = stateAssignment;
        }
        else
        {
            lastStateAssignment->nextStateAssignment = stateAssignment;
        }
        lastStateAssignment = stateAssignment;
        samplerState->numStateAssignments++;
    }

    expression = samplerState;
    return true;
}

bool HLSLParser::ParseTechnique(HLSLStatement*& statement)
{
    if (!Accept(HLSLToken_Technique)) {
        return false;
    }

    const char* techniqueName = NULL;
    if (!ExpectIdentifier(techniqueName))
    {
        return false;
    }

    if (!Expect('{'))
    {
        return false;
    }

    HLSLTechnique* technique = m_tree->AddNode<HLSLTechnique>(GetFileName(), GetLineNumber());
    technique->name = techniqueName;

    //m_techniques.PushBack(technique);

    HLSLPass* lastPass = NULL;

    // Parse state assignments.
    while (!Accept('}'))
    {
        if (CheckForUnexpectedEndOfStream('}'))
        {
            return false;
        }

        HLSLPass* pass = NULL;
        if (!ParsePass(pass))
        {
            return false;
        }
        ASSERT(pass != NULL);
        if (lastPass == NULL)
        {
            technique->passes = pass;
        }
        else
        {
            lastPass->nextPass = pass;
        }
        lastPass = pass;
        technique->numPasses++;
    }

    statement = technique;
    return true;
}

bool HLSLParser::ParsePass(HLSLPass*& pass)
{
    if (!Accept(HLSLToken_Pass)) {
        return false;
    }

    // Optional pass name.
    const char* passName = NULL;
    AcceptIdentifier(passName);

    if (!Expect('{'))
    {
        return false;
    }

    const char* fileName = GetFileName();
    int         line     = GetLineNumber();

    pass = m_tree->AddNode<HLSLPass>(fileName, line);
    pass->name = passName;

    HLSLStateAssignment* lastStateAssignment = NULL;

    // Parse state assignments.
    while (!Accept('}'))
    {
        if (CheckForUnexpectedEndOfStream('}'))
        {
            return false;
        }

        HLSLStateAssignment* stateAssignment = NULL;
        if (!ParseStateAssignment(stateAssignment, /*isSamplerState=*/false, /*isPipelineState=*/false))
        {
            return false;
        }
        ASSERT(stateAssignment != NULL);
        if (lastStateAssignment == NULL)
        {
            pass->stateAssignments = stateAssignment;
        }
        else
        {
            lastStateAssignment->nextStateAssignment = stateAssignment;
        }
        lastStateAssignment = stateAssignment;
        pass->numStateAssignments++;
    }
    return true;
}


bool HLSLParser::ParsePipeline(HLSLStatement*& statement)
{
    if (!Accept("pipeline")) {
        return false;
    }

    // Optional pipeline name.
    const char* pipelineName = NULL;
    AcceptIdentifier(pipelineName);

    if (!Expect('{'))
    {
        return false;
    }

    HLSLPipeline* pipeline = m_tree->AddNode<HLSLPipeline>(GetFileName(), GetLineNumber());
    pipeline->name = pipelineName;

    HLSLStateAssignment* lastStateAssignment = NULL;

    // Parse state assignments.
    while (!Accept('}'))
    {
        if (CheckForUnexpectedEndOfStream('}'))
        {
            return false;
        }

        HLSLStateAssignment* stateAssignment = NULL;
        if (!ParseStateAssignment(stateAssignment, /*isSamplerState=*/false, /*isPipeline=*/true))
        {
            return false;
        }
        ASSERT(stateAssignment != NULL);
        if (lastStateAssignment == NULL)
        {
            pipeline->stateAssignments = stateAssignment;
        }
        else
        {
            lastStateAssignment->nextStateAssignment = stateAssignment;
        }
        lastStateAssignment = stateAssignment;
        pipeline->numStateAssignments++;
    }

    statement = pipeline;
    return true;
}


const EffectState* GetEffectState(const char* name, bool isSamplerState, bool isPipeline)
{
    const EffectState* validStates = effectStates;
    int count = sizeof(effectStates)/sizeof(effectStates[0]);
    
    if (isPipeline)
    {
        validStates = pipelineStates;
        count = sizeof(pipelineStates) / sizeof(pipelineStates[0]);
    }

    if (isSamplerState)
    {
        validStates = samplerStates;
        count = sizeof(samplerStates)/sizeof(samplerStates[0]);
    }

    // Case insensitive comparison.
    for (int i = 0; i < count; i++)
    {
        if (String_EqualNoCase(name, validStates[i].name)) 
        {
            return &validStates[i];
        }
    }

    return NULL;
}

static const EffectStateValue* GetStateValue(const char* name, const EffectState* state)
{
    // Case insensitive comparison.
    for (int i = 0; ; i++) 
    {
        const EffectStateValue & value = state->values[i];
        if (value.name == NULL) break;

        if (String_EqualNoCase(name, value.name)) 
        {
            return &value;
        }
    }

    return NULL;
}


bool HLSLParser::ParseStateName(bool isSamplerState, bool isPipelineState, const char*& name, const EffectState *& state)
{
    if (m_tokenizer.GetToken() != HLSLToken_Identifier)
    {
        char near[HLSLTokenizer::s_maxIdentifier];
        m_tokenizer.GetTokenName(near);
        m_tokenizer.Error("Syntax error: expected identifier near '%s'", near);
        return false;
    }

    state = GetEffectState(m_tokenizer.GetIdentifier(), isSamplerState, isPipelineState);
    if (state == NULL)
    {
        m_tokenizer.Error("Syntax error: unexpected identifier '%s'", m_tokenizer.GetIdentifier());
        return false;
    }

    m_tokenizer.Next();
    return true;
}

bool HLSLParser::ParseColorMask(int& mask)
{
    mask = 0;

    do {
        if (m_tokenizer.GetToken() == HLSLToken_IntLiteral) {
            mask |= m_tokenizer.GetInt();
        }
        else if (m_tokenizer.GetToken() == HLSLToken_Identifier) {
            const char * ident = m_tokenizer.GetIdentifier();
            const EffectStateValue * stateValue = colorMaskValues;
            while (stateValue->name != NULL) {
                if (String_EqualNoCase(stateValue->name, ident)) {
                    mask |= stateValue->value;
                    break;
                }
                ++stateValue;
            }
        }
        else {
            return false;
        }
        m_tokenizer.Next();
    } while (Accept('|'));

    return true;
}

bool HLSLParser::ParseStateValue(const EffectState * state, HLSLStateAssignment* stateAssignment)
{
    const bool expectsExpression = state->values == colorMaskValues;
    const bool expectsInteger = state->values == integerValues;
    const bool expectsFloat = state->values == floatValues;
    const bool expectsBoolean = state->values == booleanValues;

    if (!expectsExpression && !expectsInteger && !expectsFloat && !expectsBoolean) 
    {
        if (m_tokenizer.GetToken() != HLSLToken_Identifier)
        {
            char near[HLSLTokenizer::s_maxIdentifier];
            m_tokenizer.GetTokenName(near);
            m_tokenizer.Error("Syntax error: expected identifier near '%s'", near);
            stateAssignment->iValue = 0;
            return false;
        }
    }

    if (state->values == NULL)
    {
        if (strcmp(m_tokenizer.GetIdentifier(), "compile") != 0)
        {
            m_tokenizer.Error("Syntax error: unexpected identifier '%s' expected compile statement", m_tokenizer.GetIdentifier());
            stateAssignment->iValue = 0;
            return false;
        }

        // @@ Parse profile name, function name, argument expressions.

        // Skip the rest of the compile statement.
        while(m_tokenizer.GetToken() != ';')
        {
            m_tokenizer.Next();
        }
    }
    else {
        if (expectsInteger)
        {
            if (!AcceptInt(stateAssignment->iValue))
            {
                m_tokenizer.Error("Syntax error: expected integer near '%s'", m_tokenizer.GetIdentifier());
                stateAssignment->iValue = 0;
                return false;
            }
        }
        else if (expectsFloat)
        {
            if (!AcceptFloat(stateAssignment->fValue))
            {
                m_tokenizer.Error("Syntax error: expected float near '%s'", m_tokenizer.GetIdentifier());
                stateAssignment->iValue = 0;
                return false;
            }
        }
        else if (expectsBoolean)
        {
            const EffectStateValue * stateValue = GetStateValue(m_tokenizer.GetIdentifier(), state);

            if (stateValue != NULL)
            {
                stateAssignment->iValue = stateValue->value;

                m_tokenizer.Next();
            }
            else if (AcceptInt(stateAssignment->iValue))
            {
                stateAssignment->iValue = (stateAssignment->iValue != 0);
            }
            else {
                m_tokenizer.Error("Syntax error: expected bool near '%s'", m_tokenizer.GetIdentifier());
                stateAssignment->iValue = 0;
                return false;
            }
        }
        else if (expectsExpression)
        {
            if (!ParseColorMask(stateAssignment->iValue))
            {
                m_tokenizer.Error("Syntax error: expected color mask near '%s'", m_tokenizer.GetIdentifier());
                stateAssignment->iValue = 0;
                return false;
            }
        }
        else 
        {
            // Expect one of the allowed values.
            const EffectStateValue * stateValue = GetStateValue(m_tokenizer.GetIdentifier(), state);

            if (stateValue == NULL)
            {
                m_tokenizer.Error("Syntax error: unexpected value '%s' for state '%s'", m_tokenizer.GetIdentifier(), state->name);
                stateAssignment->iValue = 0;
                return false;
            }

            stateAssignment->iValue = stateValue->value;

            m_tokenizer.Next();
        }
    }

    return true;
}

bool HLSLParser::ParseStateAssignment(HLSLStateAssignment*& stateAssignment, bool isSamplerState, bool isPipelineState)
{
    const char* fileName = GetFileName();
    int         line     = GetLineNumber();

    stateAssignment = m_tree->AddNode<HLSLStateAssignment>(fileName, line);

    const EffectState * state;
    if (!ParseStateName(isSamplerState, isPipelineState, stateAssignment->stateName, state)) {
        return false;
    }

    //stateAssignment->name = m_tree->AddString(m_tokenizer.GetIdentifier());
    stateAssignment->stateName = state->name;
    stateAssignment->d3dRenderState = state->d3drs;

    if (!Expect('=')) {
        return false;
    }

    if (!ParseStateValue(state, stateAssignment)) {
        return false;
    }

    if (!Expect(';')) {
        return false;
    }

    return true;
}


bool HLSLParser::ParseAttributeList(HLSLAttribute*& firstAttribute)
{
    const char* fileName = GetFileName();
    int         line     = GetLineNumber();
    
    HLSLAttribute * lastAttribute = firstAttribute;
    do {
        const char * identifier = NULL;
        if (!ExpectIdentifier(identifier)) {
            return false;
        }

        HLSLAttribute * attribute = m_tree->AddNode<HLSLAttribute>(fileName, line);
        
        if (strcmp(identifier, "unroll") == 0) attribute->attributeType = HLSLAttributeType_Unroll;
        else if (strcmp(identifier, "flatten") == 0) attribute->attributeType = HLSLAttributeType_Flatten;
        else if (strcmp(identifier, "branch") == 0) attribute->attributeType = HLSLAttributeType_Branch;
        else if (strcmp(identifier, "nofastmath") == 0) attribute->attributeType = HLSLAttributeType_NoFastMath;
        
        // @@ parse arguments, () not required if attribute constructor has no arguments.

        if (firstAttribute == NULL)
        {
            firstAttribute = attribute;
        }
        else
        {
            lastAttribute->nextAttribute = attribute;
        }
        lastAttribute = attribute;
        
    } while(Accept(','));

    return true;
}

// Attributes can have all these forms:
//   [A] statement;
//   [A,B] statement;
//   [A][B] statement;
// These are not supported yet:
//   [A] statement [B];
//   [A()] statement;
//   [A(a)] statement;
bool HLSLParser::ParseAttributeBlock(HLSLAttribute*& attribute)
{
    HLSLAttribute ** lastAttribute = &attribute;
    while (*lastAttribute != NULL) { lastAttribute = &(*lastAttribute)->nextAttribute; }

    if (!Accept('['))
    {
        return false;
    }

    // Parse list of attribute constructors.
    ParseAttributeList(*lastAttribute);

    if (!Expect(']'))
    {
        return false;
    }

    // Parse additional [] blocks.
    ParseAttributeBlock(*lastAttribute);

    return true;
}

bool HLSLParser::ParseStage(HLSLStatement*& statement)
{
    if (!Accept("stage"))
    {
        return false;
    }

    // Required stage name.
    const char* stageName = NULL;
    if (!ExpectIdentifier(stageName))
    {
        return false;
    }

    if (!Expect('{'))
    {
        return false;
    }

    HLSLStage* stage = m_tree->AddNode<HLSLStage>(GetFileName(), GetLineNumber());
    stage->name = stageName;

    BeginScope();

    HLSLType voidType(HLSLBaseType_Void);
    if (!Expect('{') || !ParseBlock(stage->statement, voidType))
    {
        return false;
    }

    EndScope();

    // @@ To finish the stage definition we should traverse the statements recursively (including function calls) and find all the input/output declarations.

    statement = stage;
    return true;
}




bool HLSLParser::Parse(const char* fileName, const char* buffer, size_t length)
{    
    HLSLRoot* root = m_tree->GetRoot();
    HLSLStatement* lastStatement = NULL;

    m_tokenizer = HLSLTokenizer(fileName, buffer, length);
    while (!Accept(HLSLToken_EndOfStream))
    {
        HLSLStatement* statement = NULL;
        if (!ParseTopLevel(statement))
        {
            return false;
        }
        if (statement != NULL)
        {   
            if (lastStatement == NULL)
            {
                root->statement = statement;
            }
            else
            {
                lastStatement->nextStatement = statement;
            }
            lastStatement = statement;
            while (lastStatement->nextStatement) lastStatement = lastStatement->nextStatement;
        }
    }
    return true;
}


bool HLSLParser::ParsePreprocessorDefine()
{
    int line             = GetLineNumber();
    const char* fileName = GetFileName();

    // Define identifier parsing:
    // Don't use AcceptIdentifier to be able to check for whitespace after define name
    // This is required to separate define name and value as both could contains parenthesis
    const char* macroName = NULL;
    m_tokenizer.Next();
    if (m_tokenizer.GetToken() == HLSLToken_Identifier)
    {
        macroName = m_tree->AddString( m_tokenizer.GetIdentifier() );
    }
    else
    {
        char near[HLSLTokenizer::s_maxIdentifier];
        m_tokenizer.GetTokenName(near);
        m_tokenizer.Error("Syntax error: expected identifier near '%s'", near);
        return false;
    }

    bool macroWithArguments = !m_tokenizer.NextIsWhitespace();

    // Macro declaration
    HLSLMacro* macro = m_tree->AddNode<HLSLMacro>(fileName, line);
    macro->name = macroName;
    m_macros.PushBack(macro);

    // Prepare next token
    m_tokenizer.Next();

    std::string value;
    if (macroWithArguments)
    {
        // Macro with arguments
        if (Accept('('))
        {
            unsigned int numArguments = 0;
            HLSLArgument* lastArgument = NULL;

            while (!Accept(')'))
            {
                if (CheckForUnexpectedEndOfStream(')'))
                {
                    return false;
                }
                if (numArguments > 0 && !Expect(','))
                {
                    return false;
                }

                HLSLArgument* argument = m_tree->AddNode<HLSLArgument>(fileName, line);
                if (!ExpectIdentifier(argument->name))
                {
                    return false;
                }

                if (lastArgument != NULL)
                {
                    lastArgument->nextArgument = argument;
                }
                else
                {
                    macro->argument = argument;
                }
                lastArgument = argument;

                ++numArguments;
            }

            macro->numArguments = numArguments;
        }

        // Macro value
        while(m_tokenizer.GetToken() != HLSLToken_EndOfLine)
        {
            bool addOriginalSource = true;

            if (m_tokenizer.GetToken() == HLSLToken_Identifier)
            {
                // Search for macro attributes
                HLSLArgument* argument = macro->argument;
                unsigned argNum = 0;
                while(argument != NULL)
                {
                    if (String_Equal(argument->name, m_tokenizer.GetIdentifier()))
                    {
                        value.append("#" + std::to_string(argNum) + "#");
                        addOriginalSource = false;
                        break;
                    }

                    argument = argument->nextArgument;
                    argNum++;
                }
            }

            if (addOriginalSource)
            {
                value.append(m_tokenizer.getLastPos(true),
                             m_tokenizer.getCurrentPos() - m_tokenizer.getLastPos(true));
            }

            m_tokenizer.Next(false);
        }


    }
    else
    {
        // Macro value
        while(m_tokenizer.GetToken() != HLSLToken_EndOfLine)
        {
            const char * start = m_tokenizer.getLastPos(true);

            std::string valueAdd(start, m_tokenizer.getCurrentPos() - start);
            value.append(valueAdd);

            m_tokenizer.Next(false);
        }
    }

    // Remove extra parenthesis
    if (value[0] == '(')
    {
        value.erase(value.length()-1, 1);
        value.erase(0, 1);
    }

    macro->value = m_tree->AddString(value.c_str());

    return true;
}


bool HLSLParser::ApplyPreprocessor(const char* fileName, const char* buffer, size_t length,
                                   std::string & sourcePreprocessed) {

    m_tokenizer = HLSLTokenizer(fileName, buffer, length);

    // Fisrt pass, grab #define
    while (m_tokenizer.GetToken() != HLSLToken_EndOfStream)
    {
        if (m_tokenizer.GetToken() == HLSLToken_PreprocessorDefine)
        {
            ParsePreprocessorDefine();
        }

        m_tokenizer.Next();
    }


    // Second pass, propagate macros definitions across macros values
    int index = 0;
    while (index <  m_macros.GetSize())
    {
        HLSLMacro * macro = m_macros[index];
        m_tokenizer = HLSLTokenizer(fileName, macro->value, strlen(macro->value));
        std::string valueProcessed;

        while (m_tokenizer.GetToken() != HLSLToken_EndOfStream)
        {
            bool addOriginalSource = true;
            if (m_tokenizer.GetToken() == HLSLToken_Identifier)
            {
                HLSLMacro * matchedMacro = ProcessMacroFromIdentifier(valueProcessed, addOriginalSource);
                if (matchedMacro != NULL)
                {
                    // Check if macro is just an alias
                    // macros value must be equal to matched macro name
                    if (macro->value == matchedMacro->name)
                    {
                        macro->macroAliased = matchedMacro;
                    }
                }
            }

            if (addOriginalSource)
            {
                valueProcessed.append(m_tokenizer.getLastPos(true),
                                      m_tokenizer.getCurrentPos() - m_tokenizer.getLastPos(true));
            }

            m_tokenizer.Next();
        }

        if (valueProcessed == "main") 
		{
            valueProcessed = "sampler_fw_main";
        }

        if (valueProcessed != macro->value)
        {
            // Define value referenced another define, it was replaced
            // try again until there is no replacement
            macro->value = m_tree->AddString(valueProcessed.c_str());

        }
        else
        {
            index++;
        }
    }

    // Third pass, macro aliases get original value and arguments
    index = 0;
    while (index <  m_macros.GetSize())
    {
        HLSLMacro * macro = m_macros[index];

        if (macro->macroAliased != NULL)
        {
            macro->argument = macro->macroAliased->argument;
            macro->numArguments = macro->macroAliased->numArguments;
            macro->value = macro->macroAliased->value;
        }

        index++;
    }

    // Fouth pass, search and replace preprocessor directives
    std::stack<bool> isCodeActive;
    isCodeActive.push(true);
    m_tokenizer = HLSLTokenizer(fileName, buffer, length);
    sourcePreprocessed.clear();
    while (m_tokenizer.GetToken() != HLSLToken_EndOfStream)
    {
        bool addOriginalSource = true;

        if (m_tokenizer.GetToken() == HLSLToken_PreprocessorIf)
        {
            while (m_tokenizer.GetToken() != HLSLToken_IntLiteral && m_tokenizer.GetToken() != HLSLToken_EndOfLine)
            {
                m_tokenizer.Next(false);
            }

            if (m_tokenizer.GetToken() == HLSLToken_IntLiteral)
            {
                isCodeActive.push(m_tokenizer.GetInt() != 0);
            }
            else
            {
                m_tokenizer.Error("#if evaluation failed: not an integer");
                return false;
            }
            addOriginalSource = false;
        }
        else if (m_tokenizer.GetToken() == HLSLToken_PreprocessorElse)
        {
            // Invert stack state
            bool state = isCodeActive.top();
            isCodeActive.pop();
            isCodeActive.push(!state);
            addOriginalSource = false;
        }
        else if (m_tokenizer.GetToken() == HLSLToken_PreprocessorEndif)
        {
            isCodeActive.pop();
            addOriginalSource = false;
        }
        else if (m_tokenizer.GetToken() == HLSLToken_PreprocessorDefine)
        {
            // Skip macros definition
            while(m_tokenizer.GetToken() != HLSLToken_EndOfLine)
            {
                m_tokenizer.Next(false);
            }

            addOriginalSource = false;
        }
        else if (m_tokenizer.GetToken() == HLSLToken_Identifier && isCodeActive.top())
        {
            ProcessMacroFromIdentifier(sourcePreprocessed, addOriginalSource);
        }
        else if (!isCodeActive.top())
        {
            addOriginalSource = false;
        }

        if (addOriginalSource)
        {
            sourcePreprocessed.append(m_tokenizer.getLastPos(false),
                                      m_tokenizer.getCurrentPos() - m_tokenizer.getLastPos(false));
        }

        m_tokenizer.Next();
    }


    return isCodeActive.size() == 1;
}


HLSLMacro * HLSLParser::ProcessMacroFromIdentifier(std::string & sourcePreprocessed, bool & addOriginalSource)
{
    // Search a define matching
    for (int i = m_macros.GetSize() - 1; i >= 0; --i)
    {
        if (String_Equal(m_macros[i]->name, m_tokenizer.GetIdentifier()))
        {
            if (m_macros[i]->argument == NULL)
            {
                // Macro without arguments
                sourcePreprocessed.append("(");
                sourcePreprocessed.append(m_macros[i]->value);
                sourcePreprocessed.append(")");
                addOriginalSource = false;
            }
            else
            {
                // Macro with arguments
                const char * savePos = m_tokenizer.getLastPos(false);

                m_tokenizer.Next();

                if (ProcessMacroArguments(m_macros[i], sourcePreprocessed))
                {
                    // Macro replaced
                    addOriginalSource = false;
                }
                else
                {
                    // Macro signatures does not match: writing back readed parts
                    sourcePreprocessed.append(savePos,
                                              m_tokenizer.getLastPos(false) - savePos);

                    m_tokenizer.ReturnToPos(m_tokenizer.getLastPos(false));

                    addOriginalSource = true;
                }
            }

            return m_macros[i];
        }
    }

    return NULL;
}



bool HLSLParser::ProcessMacroArguments(HLSLMacro* macro, std::string & sourcePreprocessed)
{
    unsigned scopeLevel = 0;
    std::vector<std::string> argumentsValues;
    std::string argValue;
    bool firstToken = true;

    // Parse arguments values
    while(m_tokenizer.GetToken() != HLSLToken_EndOfStream) {
        bool addToValue = true;

        if (firstToken && m_tokenizer.GetToken() != '(')
        {
            break;
        }
        else if (m_tokenizer.GetToken() == '(')
        {
            scopeLevel++;
            if (scopeLevel == 1)
            {
                addToValue = false;
            }
        }
        else if (m_tokenizer.GetToken() == ')')
        {
            scopeLevel--;
            if (scopeLevel == 0)
            {
                argumentsValues.push_back(argValue);
                break;
            }
        }
        else if (m_tokenizer.GetToken() == ',')
        {
            if (scopeLevel == 1)
            {
                argumentsValues.push_back(argValue);
                argValue.clear();
                addToValue = false;
            }
        }
        else if (m_tokenizer.GetToken() == HLSLToken_Identifier)
        {
            ProcessMacroFromIdentifier(argValue, addToValue);
        }

        if (addToValue)
        {
            argValue.append(m_tokenizer.getLastPos(false),
                            m_tokenizer.getCurrentPos() - m_tokenizer.getLastPos(false));
        }

        m_tokenizer.Next();
        firstToken = false;
    }

    // Arguments count does not match
    if (argumentsValues.size() != macro->numArguments) {
        return false;
    }

    // Surround macro definition with parenthesis
    sourcePreprocessed.append("(");

    // Write arguments value
    unsigned index = 0;
    std::string arg;
    bool argFound = false;
    while(index < strlen(macro->value))
    {
        if (macro->value[index] == '#' && !argFound)
        {
            argFound = true;
            arg.clear();
        }
        else if (macro->value[index] == '#' && argFound)
        {
            unsigned indexArg = std::stoi(arg);
            if (indexArg < argumentsValues.size())
            {
                sourcePreprocessed.append(argumentsValues[indexArg]);
            }
            argFound = false;
        }
        else if (argFound)
        {
            arg += macro->value[index];
        }
        else
        {
            sourcePreprocessed += macro->value[index];
        }

        index++;
    }

    // Surround macro definition with parenthesis
    sourcePreprocessed.append(")");

    return true;
}


bool HLSLParser::AcceptTypeModifier(int& flags)
{
    if (Accept(HLSLToken_Const))
    {
        flags |= HLSLTypeFlag_Const;
        return true;
    }
    else if (Accept(HLSLToken_Static))
    {
        flags |= HLSLTypeFlag_Static;
        return true;
    }
    else if (Accept(HLSLToken_Uniform))
    {
        flags |= HLSLTypeFlag_Uniform;
        return true;
    }
    else if (Accept(HLSLToken_Inline))
    {
        //flags |= HLSLTypeFlag_Uniform;      // @@ Ignored. In HLSL all functions are inline.
        return true;
    }
    /*else if (Accept("in"))
    {
        flags |= HLSLTypeFlag_Input;
        return true;
    }
    else if (Accept("out"))
    {
        flags |= HLSLTypeFlag_Output;
        return true;
    }*/

    // Not an usage keyword.
    return false;
}

bool HLSLParser::AcceptInterpolationModifier(int& flags)
{
    if (Accept("linear"))
    { 
        flags |= HLSLTypeFlag_Linear; 
        return true;
    }
    else if (Accept("centroid"))
    { 
        flags |= HLSLTypeFlag_Centroid;
        return true;
    }
    else if (Accept("nointerpolation"))
    {
        flags |= HLSLTypeFlag_NoInterpolation;
        return true;
    }
    else if (Accept("noperspective"))
    {
        flags |= HLSLTypeFlag_NoPerspective;
        return true;
    }
    else if (Accept("sample"))
    {
        flags |= HLSLTypeFlag_Sample;
        return true;
    }

    return false;
}


bool HLSLParser::AcceptType(bool allowVoid, HLSLType& type/*, bool acceptFlags*/)
{
    //if (type.flags != NULL)
    {
        type.flags = 0;
        while(AcceptTypeModifier(type.flags) || AcceptInterpolationModifier(type.flags)) {}
    }

    int token = m_tokenizer.GetToken();

    // Check built-in types.
    type.baseType = HLSLBaseType_Void;
    switch (token)
    {
    case HLSLToken_Float:
    case HLSLToken_Float1:
    case HLSLToken_Float1x1:
    case HLSLToken_Half:
    case HLSLToken_Half1:
    case HLSLToken_Half1x1:
    case HLSLToken_Double:
    case HLSLToken_Double1:
    case HLSLToken_Double1x1:
        type.baseType = HLSLBaseType_Float;
        break;
    case HLSLToken_Float2:      
    case HLSLToken_Float2x1:
    case HLSLToken_Half2:
    case HLSLToken_Half2x1:
    case HLSLToken_Double2:
    case HLSLToken_Double2x1:
        type.baseType = HLSLBaseType_Float2;
        break;
    case HLSLToken_Float3:
    case HLSLToken_Float3x1:
    case HLSLToken_Half3:
    case HLSLToken_Half3x1:
    case HLSLToken_Double3:
    case HLSLToken_Double3x1:
        type.baseType = HLSLBaseType_Float3;
        break;
    case HLSLToken_Float4:
    case HLSLToken_Float4x1:
    case HLSLToken_Half4:
    case HLSLToken_Half4x1:
    case HLSLToken_Double4:
    case HLSLToken_Double4x1:
        type.baseType = HLSLBaseType_Float4;
        break;
    case HLSLToken_Float2x4:
    case HLSLToken_Half2x4:
    case HLSLToken_Double2x4:
        type.baseType = HLSLBaseType_Float2x4;
        break;
    case HLSLToken_Float2x3:
    case HLSLToken_Half2x3:
    case HLSLToken_Double2x3:
        type.baseType = HLSLBaseType_Float2x3;
        break;
	case HLSLToken_Float2x2:
    case HLSLToken_Half2x2:
    case HLSLToken_Double2x2:
		type.baseType = HLSLBaseType_Float2x2;
		break;
    case HLSLToken_Float3x4:
    case HLSLToken_Half3x4:
    case HLSLToken_Double3x4:
        type.baseType = HLSLBaseType_Float3x4;
        break;
    case HLSLToken_Float3x3:
    case HLSLToken_Half3x3:
    case HLSLToken_Double3x3:
        type.baseType = HLSLBaseType_Float3x3;
        break;
    case HLSLToken_Float3x2:
    case HLSLToken_Half3x2:
    case HLSLToken_Double3x2:
        type.baseType = HLSLBaseType_Float3x2;
        break;
    case HLSLToken_Float4x4:
    case HLSLToken_Half4x4:
    case HLSLToken_Double4x4:
        type.baseType = HLSLBaseType_Float4x4;
        break;
    case HLSLToken_Float4x3:
    case HLSLToken_Half4x3:
    case HLSLToken_Double4x3:
        type.baseType = HLSLBaseType_Float4x3;
        break;
    case HLSLToken_Float4x2:
    case HLSLToken_Half4x2:
    case HLSLToken_Double4x2:
        type.baseType = HLSLBaseType_Float4x2;
        break;
    case HLSLToken_Bool:
        type.baseType = HLSLBaseType_Bool;
        break;
	case HLSLToken_Bool2:
		type.baseType = HLSLBaseType_Bool2;
		break;
	case HLSLToken_Bool3:
		type.baseType = HLSLBaseType_Bool3;
		break;
	case HLSLToken_Bool4:
		type.baseType = HLSLBaseType_Bool4;
		break;
    case HLSLToken_Int:
        type.baseType = HLSLBaseType_Int;
        break;
    case HLSLToken_Int2:
        type.baseType = HLSLBaseType_Int2;
        break;
    case HLSLToken_Int3:
        type.baseType = HLSLBaseType_Int3;
        break;
    case HLSLToken_Int4:
        type.baseType = HLSLBaseType_Int4;
        break;
    case HLSLToken_Uint:
        type.baseType = HLSLBaseType_Uint;
        break;
    case HLSLToken_Uint2:
        type.baseType = HLSLBaseType_Uint2;
        break;
    case HLSLToken_Uint3:
        type.baseType = HLSLBaseType_Uint3;
        break;
    case HLSLToken_Uint4:
        type.baseType = HLSLBaseType_Uint4;
        break;
    case HLSLToken_Texture:
        type.baseType = HLSLBaseType_Texture;
        break;
    case HLSLToken_Sampler:
        type.baseType = HLSLBaseType_Sampler2D;  // @@ IC: For now we assume that generic samplers are always sampler2D
        break;
    case HLSLToken_Sampler2D:
        type.baseType = HLSLBaseType_Sampler2D;
        break;
    case HLSLToken_Sampler3D:
        type.baseType = HLSLBaseType_Sampler3D;
        break;
    case HLSLToken_SamplerCube:
        type.baseType = HLSLBaseType_SamplerCube;
        break;
    case HLSLToken_Sampler2DShadow:
        type.baseType = HLSLBaseType_Sampler2DShadow;
        break;
    case HLSLToken_Sampler2DMS:
        type.baseType = HLSLBaseType_Sampler2DMS;
        break;
    case HLSLToken_Sampler2DArray:
        type.baseType = HLSLBaseType_Sampler2DArray;
        break;
    }
    if (type.baseType != HLSLBaseType_Void)
    {
        m_tokenizer.Next();
        
        if (IsSamplerType(type.baseType))
        {
            // Parse optional sampler type.
            if (Accept('<'))
            {
                int token2 = m_tokenizer.GetToken();
                if (token2 == HLSLToken_Float || token2 == HLSLToken_Float1)
                {
                    type.samplerType = HLSLBaseType_Float;
                }
                else
                {
                    m_tokenizer.Error("Expected half or float.");
                    return false;
                }
                m_tokenizer.Next();
                
                if (!Expect('>'))
                {
                    m_tokenizer.Error("Syntax error: '>' expected for sampler type");
                    return false;
                }
            }
        }
        return true;
    }

    if (allowVoid && Accept(HLSLToken_Void))
    {
        type.baseType = HLSLBaseType_Void;
        return true;
    }
    if (token == HLSLToken_Identifier)
    {
        const char* identifier = m_tree->AddString( m_tokenizer.GetIdentifier() );
        if (FindUserDefinedType(identifier) != NULL)
        {
            m_tokenizer.Next();
            type.baseType = HLSLBaseType_UserDefined;
            type.typeName = identifier;
            return true;
        }
    }
    return false;
}

bool HLSLParser::ExpectType(bool allowVoid, HLSLType& type)
{
    if (!AcceptType(allowVoid, type))
    {
        m_tokenizer.Error("Expected type");
        return false;
    }
    return true;
}

bool HLSLParser::AcceptDeclaration(bool allowUnsizedArray, HLSLType& type, const char*& name)
{
    if (!AcceptType(/*allowVoid=*/false, type))
    {
        return false;
    }

    if (!ExpectIdentifier(name))
    {
        // TODO: false means we didn't accept a declaration and we had an error!
        return false;
    }
    // Handle array syntax.
    if (Accept('['))
    {
        type.array = true;
        // Optionally allow no size to the specified for the array.
        if (Accept(']') && allowUnsizedArray)
        {
            return true;
        }
        if (!ParseExpression(type.arraySize) || !Expect(']'))
        {
            return false;
        }
    }
    return true;
}

bool HLSLParser::ExpectDeclaration(bool allowUnsizedArray, HLSLType& type, const char*& name)
{
    if (!AcceptDeclaration(allowUnsizedArray, type, name))
    {
        m_tokenizer.Error("Expected declaration");
        return false;
    }
    return true;
}

const HLSLStruct* HLSLParser::FindUserDefinedType(const char* name) const
{
    // Pointer comparison is sufficient for strings since they exist in the
    // string pool.
    for (int i = 0; i < m_userTypes.GetSize(); ++i)
    {
        if (m_userTypes[i]->name == name)
        {
            return m_userTypes[i];
        }
    }
    return NULL;
}

bool HLSLParser::CheckForUnexpectedEndOfStream(int endToken)
{
    if (Accept(HLSLToken_EndOfStream))
    {
        char what[HLSLTokenizer::s_maxIdentifier];
        m_tokenizer.GetTokenName(endToken, what);
        m_tokenizer.Error("Unexpected end of file while looking for '%s'", what);
        return true;
    }
    return false;
}

int HLSLParser::GetLineNumber() const
{
    return m_tokenizer.GetLineNumber();
}

const char* HLSLParser::GetFileName()
{
    return m_tree->AddString( m_tokenizer.GetFileName() );
}

void HLSLParser::BeginScope()
{
    // Use NULL as a sentinel that indices a new scope level.
    Variable& variable = m_variables.PushBackNew();
    variable.name = NULL;
}

void HLSLParser::EndScope()
{
    int numVariables = m_variables.GetSize() - 1;
    while (m_variables[numVariables].name != NULL)
    {
        --numVariables;
        ASSERT(numVariables >= 0);
    }
    m_variables.Resize(numVariables);
}

const HLSLType* HLSLParser::FindVariable(const char* name, bool& global) const
{
    for (int i = m_variables.GetSize() - 1; i >= 0; --i)
    {
        if (m_variables[i].name == name)
        {
            global = (i < m_numGlobals);
            return &m_variables[i].type;
        }
    }
    return NULL;
}

const HLSLFunction* HLSLParser::FindFunction(const char* name) const
{
    for (int i = 0; i < m_functions.GetSize(); ++i)
    {
        if (m_functions[i]->name == name)
        {
            return m_functions[i];
        }
    }
    return NULL;
}

static bool AreTypesEqual(HLSLTree* tree, const HLSLType& lhs, const HLSLType& rhs)
{
    return GetTypeCastRank(tree, lhs, rhs) == 0;
}

static bool AreArgumentListsEqual(HLSLTree* tree, HLSLArgument* lhs, HLSLArgument* rhs)
{
    while (lhs && rhs)
    {
        if (!AreTypesEqual(tree, lhs->type, rhs->type))
            return false;

        if (lhs->modifier != rhs->modifier)
            return false;

        if (lhs->semantic != rhs->semantic || lhs->sv_semantic != rhs->sv_semantic)
            return false;

        lhs = lhs->nextArgument;
        rhs = rhs->nextArgument;
    }

    return lhs == NULL && rhs == NULL;
}

const HLSLFunction* HLSLParser::FindFunction(const HLSLFunction* fun) const
{
    for (int i = 0; i < m_functions.GetSize(); ++i)
    {
        if (m_functions[i]->name == fun->name &&
            AreTypesEqual(m_tree, m_functions[i]->returnType, fun->returnType) &&
            AreArgumentListsEqual(m_tree, m_functions[i]->argument, fun->argument))
        {
            return m_functions[i];
        }
    }
    return NULL;
}

void HLSLParser::DeclareVariable(const char* name, const HLSLType& type)
{
    if (m_variables.GetSize() == m_numGlobals)
    {
        ++m_numGlobals;
    }
    Variable& variable = m_variables.PushBackNew();
    variable.name = name;
    variable.type = type;
}

bool HLSLParser::GetIsFunction(const char* name) const
{
    for (int i = 0; i < m_functions.GetSize(); ++i)
    {
        // == is ok here because we're passed the strings through the string pool.
        if (m_functions[i]->name == name)
        {
            return true;
        }
    }
    for (int i = 0; i < _numIntrinsics; ++i)
    {
        // Intrinsic names are not in the string pool (since they are compile time
        // constants, so we need full string compare).
        if (String_Equal(name, _intrinsic[i].function.name))
        {
            return true;
        }
    }

    return false;
}

const HLSLFunction* HLSLParser::MatchFunctionCall(const HLSLFunctionCall* functionCall, const char* name)
{
    const HLSLFunction* matchedFunction     = NULL;

    int  numMatchedOverloads    = 0;
    bool nameMatches            = false;

    // Get the user defined functions with the specified name.
    for (int i = 0; i < m_functions.GetSize(); ++i)
    {
        const HLSLFunction* function = m_functions[i];
        if (function->name == name)
        {
            nameMatches = true;
            
            CompareFunctionsResult result = CompareFunctions( m_tree, functionCall, function, matchedFunction );
            if (result == Function1Better)
            {
                matchedFunction = function;
                numMatchedOverloads = 1;
            }
            else if (result == FunctionsEqual)
            {
                ++numMatchedOverloads;
            }
        }
    }

    // Get the intrinsic functions with the specified name.
    for (int i = 0; i < _numIntrinsics; ++i)
    {
        const HLSLFunction* function = &_intrinsic[i].function;
        if (String_Equal(function->name, name))
        {
            nameMatches = true;

            CompareFunctionsResult result = CompareFunctions( m_tree, functionCall, function, matchedFunction );
            if (result == Function1Better)
            {
                matchedFunction = function;
                numMatchedOverloads = 1;
            }
            else if (result == FunctionsEqual)
            {
                ++numMatchedOverloads;
            }
        }
    }

    if (matchedFunction != NULL && numMatchedOverloads > 1)
    {
        // Multiple overloads match.
        m_tokenizer.Error("'%s' %d overloads have similar conversions", name, numMatchedOverloads);
        return NULL;
    }
    else if (matchedFunction == NULL)
    {
        if (nameMatches)
        {
            m_tokenizer.Error("'%s' no overloaded function matched all of the arguments", name);
        }
        else
        {
            m_tokenizer.Error("Undeclared identifier '%s'", name);
        }
    }

    return matchedFunction;
}

bool HLSLParser::GetMemberType(const HLSLType& objectType, HLSLMemberAccess * memberAccess)
{
    const char* fieldName = memberAccess->field;

    if (objectType.baseType == HLSLBaseType_UserDefined)
    {
        const HLSLStruct* structure = FindUserDefinedType( objectType.typeName );
        ASSERT(structure != NULL);

        const HLSLStructField* field = structure->field;
        while (field != NULL)
        {
            if (field->name == fieldName)
            {
                memberAccess->expressionType = field->type;
                return true;
            }
            field = field->nextField;
        }

        return false;
    }

    if (baseTypeDescriptions[objectType.baseType].numericType == NumericType_NaN)
    {
        // Currently we don't have an non-numeric types that allow member access.
        return false;
    }

    int swizzleLength = 0;

    if (baseTypeDescriptions[objectType.baseType].numDimensions <= 1)
    {
        // Check for a swizzle on the scalar/vector types.
        for (int i = 0; fieldName[i] != 0; ++i)
        {
            if (fieldName[i] != 'x' && fieldName[i] != 'y' && fieldName[i] != 'z' && fieldName[i] != 'w' &&
                fieldName[i] != 'r' && fieldName[i] != 'g' && fieldName[i] != 'b' && fieldName[i] != 'a')
            {
                m_tokenizer.Error("Invalid swizzle '%s'", fieldName);
                return false;
            }
            ++swizzleLength;
        }
        ASSERT(swizzleLength > 0);
    }
    else
    {

        // Check for a matrix element access (e.g. _m00 or _11)

        const char* n = fieldName;
        while (n[0] == '_')
        {
            ++n;
            int base = 1;
            if (n[0] == 'm')
            {
                base = 0;
                ++n;
            }
            if (!isdigit(n[0]) || !isdigit(n[1]))
            {
                return false;
            }

            int r = (n[0] - '0') - base;
            int c = (n[1] - '0') - base;
            if (r >= baseTypeDescriptions[objectType.baseType].height ||
                c >= baseTypeDescriptions[objectType.baseType].numComponents)
            {
                return false;
            }
            ++swizzleLength;
            n += 2;

        }

        if (n[0] != 0)
        {
            return false;
        }

    }

    if (swizzleLength > 4)
    {
        m_tokenizer.Error("Invalid swizzle '%s'", fieldName);
        return false;
    }

    static const HLSLBaseType floatType[] = { HLSLBaseType_Float, HLSLBaseType_Float2, HLSLBaseType_Float3, HLSLBaseType_Float4 };
    static const HLSLBaseType intType[]   = { HLSLBaseType_Int,   HLSLBaseType_Int2,   HLSLBaseType_Int3,   HLSLBaseType_Int4   };
    static const HLSLBaseType uintType[]  = { HLSLBaseType_Uint,  HLSLBaseType_Uint2,  HLSLBaseType_Uint3,  HLSLBaseType_Uint4  };
    static const HLSLBaseType boolType[]  = { HLSLBaseType_Bool,  HLSLBaseType_Bool2,  HLSLBaseType_Bool3,  HLSLBaseType_Bool4  };
    
    switch (baseTypeDescriptions[objectType.baseType].numericType)
    {
    case NumericType_Float:
        memberAccess->expressionType.baseType = floatType[swizzleLength - 1];
        break;
    case NumericType_Int:
        memberAccess->expressionType.baseType = intType[swizzleLength - 1];
        break;
    case NumericType_Uint:
        memberAccess->expressionType.baseType = uintType[swizzleLength - 1];
            break;
    case NumericType_Bool:
        memberAccess->expressionType.baseType = boolType[swizzleLength - 1];
            break;
    default:
        ASSERT(0);
    }

    memberAccess->swizzle = true;
    
    return true;
}

}
