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.
7 #ifndef COMPILER_VERSIONGLSL_H_
8 #define COMPILER_VERSIONGLSL_H_
10 #include "GLSLANG/ShaderLang.h"
11 #include "compiler/intermediate.h"
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.
26 class TVersionGLSL : public TIntermTraverser {
28 TVersionGLSL(ShShaderType type);
30 // Returns 120 if "invariant" keyword, "gl_PointCoord", or
31 // matrix/matrix constructors are used in the shader. Else 110 is
33 int getVersion() { return mVersion; }
35 virtual void visitSymbol(TIntermSymbol*);
36 virtual void visitConstantUnion(TIntermConstantUnion*);
37 virtual bool visitBinary(Visit, TIntermBinary*);
38 virtual bool visitUnary(Visit, TIntermUnary*);
39 virtual bool visitSelection(Visit, TIntermSelection*);
40 virtual bool visitAggregate(Visit, TIntermAggregate*);
41 virtual bool visitLoop(Visit, TIntermLoop*);
42 virtual bool visitBranch(Visit, TIntermBranch*);
45 void updateVersion(int version);
48 ShShaderType mShaderType;
52 #endif // COMPILER_VERSIONGLSL_H_