OgreShaderGLSLProgramWriter.h

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/*
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This source file is part of OGRE
(Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org

Copyright (c) 2000-2013 Torus Knot Software Ltd
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*/
#ifndef _ShaderProgramWriterGLSL_
#define _ShaderProgramWriterGLSL_

#include "OgreShaderProgramWriterManager.h"

namespace Ogre {
namespace RTShader {

class _OgreRTSSExport GLSLProgramWriter : public ProgramWriter
{
    // Interface.
public:

    GLSLProgramWriter();

    virtual ~GLSLProgramWriter();


    virtual void writeSourceCode(std::ostream& os, Program* program);

    virtual const String& getTargetLanguage() const { return TargetLanguage; }

    static String TargetLanguage;


    // Protected methods.
protected:

    void initializeStringMaps();

    void writeLocalParameter(std::ostream& os, ParameterPtr parameter);

    void writeForwardDeclarations(std::ostream& os, Program* program);

    void writeInputParameters(std::ostream& os, Function* function, GpuProgramType gpuType);
    
    void writeOutParameters(std::ostream& os, Function* function, GpuProgramType gpuType);

protected:
    typedef map<GpuConstantType, const char*>::type     GpuConstTypeToStringMap;
    typedef map<Parameter::Semantic, const char*>::type ParamSemanticToStringMap;
    typedef map<Parameter::Content, const char*>::type  ParamContentToStringMap;
    typedef map<String, String>::type                   StringMap;

    // Attributes.
protected:
    // Map between GPU constant type to string value.
    GpuConstTypeToStringMap mGpuConstTypeMap;
    // Map between parameter semantic to string value.
    ParamSemanticToStringMap mParamSemanticMap;

    // Map parameter name to a new parameter name (sometime renaming is required to match names between vertex and fragment shader)
    StringMap mInputToGLStatesMap;
    // Map parameter content to vertex attributes 
    ParamContentToStringMap mContentToPerVertexAttributes;
    // Holds the current glsl version
    int mGLSLVersion;
    // Holds the fragment input params 
    StringVector mFragInputParams;
};

class _OgreRTSSExport ShaderProgramWriterGLSLFactory : public ProgramWriterFactory
{
public:
    ShaderProgramWriterGLSLFactory() : mLanguage("glsl")
    {
    }
    virtual ~ShaderProgramWriterGLSLFactory() {}

    virtual const String& getTargetLanguage(void) const
    {
        return mLanguage;
    }

    virtual ProgramWriter* create(void)
    {
        return OGRE_NEW GLSLProgramWriter();
    }

private:
    String mLanguage;

};

}
}

#endif