1//
2// Copyright (c) 2002-2013 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_TRANSLATOR_VERSIONGLSL_H_
8#define COMPILER_TRANSLATOR_VERSIONGLSL_H_
9
10#include "compiler/translator/IntermNode.h"
11
12// Traverses the intermediate tree to return the minimum GLSL version
13// required to legally access all built-in features used in the shader.
14// GLSL 1.1 which is mandated by OpenGL 2.0 provides:
15//   - #version and #extension to declare version and extensions.
16//   - built-in functions refract, exp, and log.
17//   - updated step() to compare x < edge instead of x <= edge.
18// GLSL 1.2 which is mandated by OpenGL 2.1 provides:
19//   - many changes to reduce differences when compared to the ES specification.
20//   - invariant keyword and its support.
21//   - c++ style name hiding rules.
22//   - built-in variable gl_PointCoord for fragment shaders.
23//   - matrix constructors taking matrix as argument.
24//   - array as "out" function parameters
25//
26// TODO: ES3 equivalent versions of GLSL
27class TVersionGLSL : public TIntermTraverser
28{
29  public:
30    TVersionGLSL(sh::GLenum type);
31
32    // Returns 120 if the following is used the shader:
33    // - "invariant",
34    // - "gl_PointCoord",
35    // - matrix/matrix constructors
36    // - array "out" parameters
37    // Else 110 is returned.
38    int getVersion() { return mVersion; }
39
40    virtual void visitSymbol(TIntermSymbol *);
41    virtual bool visitAggregate(Visit, TIntermAggregate *);
42
43  protected:
44    void updateVersion(int version);
45
46  private:
47    int mVersion;
48};
49
50#endif  // COMPILER_TRANSLATOR_VERSIONGLSL_H_
51