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 //

 // Copyright (c) 2011 The ANGLE Project Authors. All rights reserved.

 // Use of this source code is governed by a BSD-style license that can be

 // found in the LICENSE file.

 //

 #ifndef COMPILIER_BUILT_IN_FUNCTION_EMULATOR_H_

 #define COMPILIER_BUILT_IN_FUNCTION_EMULATOR_H_

 #include "GLSLANG/ShaderLang.h"

 #include "compiler/InfoSink.h"

 #include "compiler/intermediate.h"

 //

 // This class decides which built-in functions need to be replaced with the

 // emulated ones.

 // It's only a workaround for OpenGL driver bugs, and isn't needed in general.

 //

 class BuiltInFunctionEmulator {

 public:

     BuiltInFunctionEmulator(ShShaderType shaderType);

     // Records that a function is called by the shader and might needs to be

     // emulated.  If the function's group is not in mFunctionGroupFilter, this

     // becomes an no-op.

     // Returns true if the function call needs to be replaced with an emulated

     // one.

     bool SetFunctionCalled(TOperator op, const TType& param);

     bool SetFunctionCalled(

         TOperator op, const TType& param1, const TType& param2);

     bool SetFunctionCalled(

         TOperator op, const TType& param1, const TType& param2, const TType& param3);

     // Output function emulation definition.  This should be before any other

     // shader source.

     void OutputEmulatedFunctionDefinition(TInfoSinkBase& out, bool withPrecision) const;

     void MarkBuiltInFunctionsForEmulation(TIntermNode* root);

     void Cleanup();

     // "name(" becomes "webgl_name_emu(".

     static TString GetEmulatedFunctionName(const TString& name);

 private:

     //

     // Built-in functions.

     //

     enum TBuiltInFunction {

         TFunctionCos1 = 0,  // float cos(float);

         TFunctionCos2,  // vec2 cos(vec2);

         TFunctionCos3,  // vec3 cos(vec3);

         TFunctionCos4,  // vec4 cos(vec4);

         TFunctionDistance1_1,  // float distance(float, float);

         TFunctionDistance2_2,  // vec2 distance(vec2, vec2);

         TFunctionDistance3_3,  // vec3 distance(vec3, vec3);

         TFunctionDistance4_4,  // vec4 distance(vec4, vec4);

         TFunctionDot1_1,  // float dot(float, float);

         TFunctionDot2_2,  // vec2 dot(vec2, vec2);

         TFunctionDot3_3,  // vec3 dot(vec3, vec3);

         TFunctionDot4_4,  // vec4 dot(vec4, vec4);

         TFunctionFaceForward1_1_1,  // float faceforward(float, float, float);

         TFunctionFaceForward2_2_2,  // vec2 faceforward(vec2, vec2, vec2);

         TFunctionFaceForward3_3_3,  // vec3 faceforward(vec3, vec3, vec3);

         TFunctionFaceForward4_4_4,  // vec4 faceforward(vec4, vec4, vec4);

         TFunctionLength1,  // float length(float);

         TFunctionLength2,  // float length(vec2);

         TFunctionLength3,  // float length(vec3);

         TFunctionLength4,  // float length(vec4);

         TFunctionNormalize1,  // float normalize(float);

         TFunctionNormalize2,  // vec2 normalize(vec2);

         TFunctionNormalize3,  // vec3 normalize(vec3);

         TFunctionNormalize4,  // vec4 normalize(vec4);

         TFunctionReflect1_1,  // float reflect(float, float);

         TFunctionReflect2_2,  // vec2 reflect(vec2, vec2);

         TFunctionReflect3_3,  // vec3 reflect(vec3, vec3);

         TFunctionReflect4_4,  // vec4 reflect(vec4, vec4);

         TFunctionUnknown

     };

     TBuiltInFunction IdentifyFunction(TOperator op, const TType& param);

     TBuiltInFunction IdentifyFunction(

         TOperator op, const TType& param1, const TType& param2);

     TBuiltInFunction IdentifyFunction(

         TOperator op, const TType& param1, const TType& param2, const TType& param3);

     bool SetFunctionCalled(TBuiltInFunction function);

     std::vector<TBuiltInFunction> mFunctions;

     const bool* mFunctionMask;  // a boolean flag for each function.

     const char** mFunctionSource;

 };

 #endif  // COMPILIER_BUILT_IN_FUNCTION_EMULATOR_H_