kc3-lang/angle/src/compiler/BuiltInFunctionEmulator.h

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• Hash : 46974d29
  Author :
  Date : 2011-09-27T21:26:19
  

  Fix memory corruption in ANGLE shader translator.
  
  The bug is that within each compilation cycle, all the memory allocated through T* types are freed to be reused.  So if certain information is meant to outlive the cycle, it should use the std type instead of the T* type:
  
  1) emulated function vector
  2) mapped long names map
  
  BUG=none
  TEST=webgl conformance test conformance/glsl/glsl-feature-mod-gentype.html does not crash in Win Debug.
  Review URL: http://codereview.appspot.com/5137047
  
  git-svn-id: https://angleproject.googlecode.com/svn/trunk@773 736b8ea6-26fd-11df-bfd4-992fa37f6226
  

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• src/compiler/BuiltInFunctionEmulator.h

• //
  // 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 {
          TFunctionAtan1_1 = 0,  // float atan(float, float);
          TFunctionAtan2_2,  // vec2 atan(vec2, vec2);
          TFunctionAtan3_3,  // vec3 atan(vec3, vec2);
          TFunctionAtan4_4,  // vec4 atan(vec4, vec2);
  
          TFunctionCos1,  // 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);
  
          TFunctionMod1_1,  // float mod(float, float);
          TFunctionMod2_2,  // vec2 mod(vec2, vec2);
          TFunctionMod3_3,  // vec3 mod(vec3, vec3);
          TFunctionMod4_4,  // vec4 mod(vec4, 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_
  

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