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 // 25 class TVersionGLSL : public TIntermTraverser { 26 public: 27 TVersionGLSL(ShShaderType type); 28 29 // Returns 120 if "invariant" keyword or "gl_PointCoord" is used 30 // in the shader. Else 110 is returned. getVersion()31 int getVersion() { return mVersion; } 32 33 virtual void visitSymbol(TIntermSymbol*); 34 virtual void visitConstantUnion(TIntermConstantUnion*); 35 virtual bool visitBinary(Visit, TIntermBinary*); 36 virtual bool visitUnary(Visit, TIntermUnary*); 37 virtual bool visitSelection(Visit, TIntermSelection*); 38 virtual bool visitAggregate(Visit, TIntermAggregate*); 39 virtual bool visitLoop(Visit, TIntermLoop*); 40 virtual bool visitBranch(Visit, TIntermBranch*); 41 42 protected: 43 void updateVersion(int version); 44 45 private: 46 ShShaderType mShaderType; 47 int mVersion; 48 }; 49 50 #endif // COMPILER_VERSIONGLSL_H_ 51