michael@0: //
michael@0: // Copyright (c) 2002-2010 The ANGLE Project Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: //
michael@0: 
michael@0: #ifndef COMPILER_VERSIONGLSL_H_
michael@0: #define COMPILER_VERSIONGLSL_H_
michael@0: 
michael@0: #include "GLSLANG/ShaderLang.h"
michael@0: #include "compiler/intermediate.h"
michael@0: 
michael@0: // Traverses the intermediate tree to return the minimum GLSL version
michael@0: // required to legally access all built-in features used in the shader.
michael@0: // GLSL 1.1 which is mandated by OpenGL 2.0 provides:
michael@0: //   - #version and #extension to declare version and extensions.
michael@0: //   - built-in functions refract, exp, and log.
michael@0: //   - updated step() to compare x < edge instead of x <= edge.
michael@0: // GLSL 1.2 which is mandated by OpenGL 2.1 provides:
michael@0: //   - many changes to reduce differences when compared to the ES specification.
michael@0: //   - invariant keyword and its support.
michael@0: //   - c++ style name hiding rules.
michael@0: //   - built-in variable gl_PointCoord for fragment shaders.
michael@0: //   - matrix constructors taking matrix as argument.
michael@0: //   - array as "out" function parameters
michael@0: //
michael@0: class TVersionGLSL : public TIntermTraverser {
michael@0: public:
michael@0:     TVersionGLSL(ShShaderType type);
michael@0: 
michael@0:     // Returns 120 if the following is used the shader:
michael@0:     // - "invariant",
michael@0:     // - "gl_PointCoord",
michael@0:     // - matrix/matrix constructors
michael@0:     // - array "out" parameters
michael@0:     // Else 110 is returned.
michael@0:     int getVersion() { return mVersion; }
michael@0: 
michael@0:     virtual void visitSymbol(TIntermSymbol*);
michael@0:     virtual void visitConstantUnion(TIntermConstantUnion*);
michael@0:     virtual bool visitBinary(Visit, TIntermBinary*);
michael@0:     virtual bool visitUnary(Visit, TIntermUnary*);
michael@0:     virtual bool visitSelection(Visit, TIntermSelection*);
michael@0:     virtual bool visitAggregate(Visit, TIntermAggregate*);
michael@0:     virtual bool visitLoop(Visit, TIntermLoop*);
michael@0:     virtual bool visitBranch(Visit, TIntermBranch*);
michael@0: 
michael@0: protected:
michael@0:     void updateVersion(int version);
michael@0: 
michael@0: private:
michael@0:     ShShaderType mShaderType;
michael@0:     int mVersion;
michael@0: };
michael@0: 
michael@0: #endif  // COMPILER_VERSIONGLSL_H_