1 // 2 // Copyright (c) 2002-2010 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 COMPILER_VERSIONGLSL_H_ 8 #define COMPILER_VERSIONGLSL_H_ 9 10 #include "GLSLANG/ShaderLang.h" 11 #include "compiler/intermediate.h" 12 13 // Traverses the intermediate tree to return the minimum GLSL version 14 // required to legally access all built-in features used in the shader. 15 // GLSL 1.1 which is mandated by OpenGL 2.0 provides: 16 // - #version and #extension to declare version and extensions. 17 // - built-in functions refract, exp, and log. 18 // - updated step() to compare x < edge instead of x <= edge. 19 // GLSL 1.2 which is mandated by OpenGL 2.1 provides: 20 // - many changes to reduce differences when compared to the ES specification. 21 // - invariant keyword and its support. 22 // - c++ style name hiding rules. 23 // - built-in variable gl_PointCoord for fragment shaders. 24 // - matrix constructors taking matrix as argument. 25 // - array as "out" function parameters 26 // 27 class TVersionGLSL : public TIntermTraverser { 28 public: 29 TVersionGLSL(ShShaderType type); 30 31 // Returns 120 if the following is used the shader: 32 // - "invariant", 33 // - "gl_PointCoord", 34 // - matrix/matrix constructors 35 // - array "out" parameters 36 // Else 110 is returned. getVersion()37 int getVersion() { return mVersion; } 38 39 virtual void visitSymbol(TIntermSymbol*); 40 virtual void visitConstantUnion(TIntermConstantUnion*); 41 virtual bool visitBinary(Visit, TIntermBinary*); 42 virtual bool visitUnary(Visit, TIntermUnary*); 43 virtual bool visitSelection(Visit, TIntermSelection*); 44 virtual bool visitAggregate(Visit, TIntermAggregate*); 45 virtual bool visitLoop(Visit, TIntermLoop*); 46 virtual bool visitBranch(Visit, TIntermBranch*); 47 48 protected: 49 void updateVersion(int version); 50 51 private: 52 ShShaderType mShaderType; 53 int mVersion; 54 }; 55 56 #endif // COMPILER_VERSIONGLSL_H_ 57