kc3-lang/angle/src/compiler/VersionGLSL.h

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• Author : alokp@chromium.org
  Date : 2010-10-13 19:28:25
  Hash : 9ecf3950
  Message : GLSL backend now emits "#version 120" to legally access invariant keyword and gl_PointCoord built-in variable. BUG=35 Review URL: http://codereview.appspot.com/2341043 git-svn-id: https://angleproject.googlecode.com/svn/trunk@448 736b8ea6-26fd-11df-bfd4-992fa37f6226

• src/compiler/VersionGLSL.h

• //
  // 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.
  //
  class TVersionGLSL : public TIntermTraverser {
  public:
      TVersionGLSL(ShShaderType type);
  
      // Returns 120 if "invariant" keyword or "gl_PointCoord" is 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_