OutputGLSLBase.h

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Author : zmo@google.com
Date : 2011-06-10 18:23:25
Hash : 5601ea0d
Message : Implement ES2 backend for Angle translator. With this CL, we have the option to select a code output backend: GLSL, GLSL ES, or HLSL. Note that we always emit the highest supported float precision for fragment shader due to anglebug 168. Although this is a temporary solution, it's not against GLSL ES spec, because it's ok for implementation to upgrade precision. Tested with WebGL conformance test suite, GLES2 conformance test suite (only failed 2/1198), and a few webgl demos, including worlds of webgl, aquarium, etc. anglebug=81 test=translator emitting correct GLSL ES code when ES2 backend is selected. Review URL: http://codereview.appspot.com/4550129 git-svn-id: https://angleproject.googlecode.com/svn/trunk@687 736b8ea6-26fd-11df-bfd4-992fa37f6226

src/compiler/OutputGLSLBase.h

//
// Copyright (c) 2002-2011 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 CROSSCOMPILERGLSL_OUTPUTGLSLBASE_H_
#define CROSSCOMPILERGLSL_OUTPUTGLSLBASE_H_

#include <set>

#include "compiler/ForLoopUnroll.h"
#include "compiler/intermediate.h"
#include "compiler/ParseHelper.h"

class TOutputGLSLBase : public TIntermTraverser
{
public:
    TOutputGLSLBase(TInfoSinkBase& objSink);

protected:
    TInfoSinkBase& objSink() { return mObjSink; }
    void writeTriplet(Visit visit, const char* preStr, const char* inStr, const char* postStr);
    void writeVariableType(const TType& type);
    virtual bool writeVariablePrecision(TPrecision precision) = 0;
    void writeFunctionParameters(const TIntermSequence& args);
    const ConstantUnion* writeConstantUnion(const TType& type, const ConstantUnion* pConstUnion);

    virtual void visitSymbol(TIntermSymbol* node);
    virtual void visitConstantUnion(TIntermConstantUnion* node);
    virtual bool visitBinary(Visit visit, TIntermBinary* node);
    virtual bool visitUnary(Visit visit, TIntermUnary* node);
    virtual bool visitSelection(Visit visit, TIntermSelection* node);
    virtual bool visitAggregate(Visit visit, TIntermAggregate* node);
    virtual bool visitLoop(Visit visit, TIntermLoop* node);
    virtual bool visitBranch(Visit visit, TIntermBranch* node);

    void visitCodeBlock(TIntermNode* node);

private:
    TInfoSinkBase& mObjSink;
    bool mDeclaringVariables;

    // Structs are declared as the tree is traversed. This set contains all
    // the structs already declared. It is maintained so that a struct is
    // declared only once.
    typedef std::set<TString> DeclaredStructs;
    DeclaredStructs mDeclaredStructs;

    ForLoopUnroll mLoopUnroll;
};

#endif  // CROSSCOMPILERGLSL_OUTPUTGLSLBASE_H_

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

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