| // |
| // 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); |
| |
| // 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); |
| |
| 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); |
| |
| 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_ |