1 // 2 // Copyright (c) 2011 The ANGLE Project Authors. All rights reserved. 3 // Use of this source code is governed by a BSD-style license that can be 4 // found in the LICENSE file. 5 // 6 7 #ifndef COMPILIER_BUILT_IN_FUNCTION_EMULATOR_H_ 8 #define COMPILIER_BUILT_IN_FUNCTION_EMULATOR_H_ 9 10 #include "compiler/translator/InfoSink.h" 11 #include "compiler/translator/IntermNode.h" 12 13 // 14 // This class decides which built-in functions need to be replaced with the 15 // emulated ones. 16 // It's only a workaround for OpenGL driver bugs, and isn't needed in general. 17 // 18 class BuiltInFunctionEmulator { 19 public: 20 BuiltInFunctionEmulator(sh::GLenum shaderType); 21 // Records that a function is called by the shader and might needs to be 22 // emulated. If the function's group is not in mFunctionGroupFilter, this 23 // becomes an no-op. 24 // Returns true if the function call needs to be replaced with an emulated 25 // one. 26 bool SetFunctionCalled(TOperator op, const TType& param); 27 bool SetFunctionCalled( 28 TOperator op, const TType& param1, const TType& param2); 29 30 // Output function emulation definition. This should be before any other 31 // shader source. 32 void OutputEmulatedFunctionDefinition(TInfoSinkBase& out, bool withPrecision) const; 33 34 void MarkBuiltInFunctionsForEmulation(TIntermNode* root); 35 36 void Cleanup(); 37 38 // "name(" becomes "webgl_name_emu(". 39 static TString GetEmulatedFunctionName(const TString& name); 40 41 private: 42 // 43 // Built-in functions. 44 // 45 enum TBuiltInFunction { 46 TFunctionCos1 = 0, // float cos(float); 47 TFunctionCos2, // vec2 cos(vec2); 48 TFunctionCos3, // vec3 cos(vec3); 49 TFunctionCos4, // vec4 cos(vec4); 50 51 TFunctionDistance1_1, // float distance(float, float); 52 TFunctionDistance2_2, // vec2 distance(vec2, vec2); 53 TFunctionDistance3_3, // vec3 distance(vec3, vec3); 54 TFunctionDistance4_4, // vec4 distance(vec4, vec4); 55 56 TFunctionDot1_1, // float dot(float, float); 57 TFunctionDot2_2, // vec2 dot(vec2, vec2); 58 TFunctionDot3_3, // vec3 dot(vec3, vec3); 59 TFunctionDot4_4, // vec4 dot(vec4, vec4); 60 61 TFunctionLength1, // float length(float); 62 TFunctionLength2, // float length(vec2); 63 TFunctionLength3, // float length(vec3); 64 TFunctionLength4, // float length(vec4); 65 66 TFunctionNormalize1, // float normalize(float); 67 TFunctionNormalize2, // vec2 normalize(vec2); 68 TFunctionNormalize3, // vec3 normalize(vec3); 69 TFunctionNormalize4, // vec4 normalize(vec4); 70 71 TFunctionReflect1_1, // float reflect(float, float); 72 TFunctionReflect2_2, // vec2 reflect(vec2, vec2); 73 TFunctionReflect3_3, // vec3 reflect(vec3, vec3); 74 TFunctionReflect4_4, // vec4 reflect(vec4, vec4); 75 76 TFunctionUnknown 77 }; 78 79 TBuiltInFunction IdentifyFunction(TOperator op, const TType& param); 80 TBuiltInFunction IdentifyFunction( 81 TOperator op, const TType& param1, const TType& param2); 82 83 bool SetFunctionCalled(TBuiltInFunction function); 84 85 std::vector<TBuiltInFunction> mFunctions; 86 87 const bool* mFunctionMask; // a boolean flag for each function. 88 const char** mFunctionSource; 89 }; 90 91 #endif // COMPILIER_BUILT_IN_FUNCTION_EMULATOR_H_ 92
