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