OgreShaderGLSLESProgramWriter.h

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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
Permission is hereby granted, free of charge, to any person obtaining a copy
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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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*/
#ifndef _ShaderProgramWriterGLSLES_
#define _ShaderProgramWriterGLSLES_

#include "OgreShaderProgramWriterManager.h"

namespace Ogre {
namespace RTShader {

class GLSLESProgramWriter : public ProgramWriter
{
    // Interface.
public:

    GLSLESProgramWriter ();

    virtual ~GLSLESProgramWriter    ();


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

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

    static String TargetLanguage;

    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;
    typedef     map<FunctionInvocation, String>::type       FunctionMap;
    typedef     vector<FunctionInvocation>::type            FunctionVector;
    typedef     FunctionMap::const_iterator                 FunctionMapIterator;
    typedef     FunctionVector::const_iterator              FunctionVectorIterator;
    typedef     GpuConstTypeToStringMap::const_iterator     GpuConstTypeToStringMapIterator;

    // Protected methods.
protected:

    void                initializeStringMaps        ();

    virtual void        cacheDependencyFunctions(const String & libName);


    FunctionInvocation  *createInvocationFromString (const String & input);

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

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

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

    String processOperand(Operand op, GpuProgramType gpuType);
    
    bool                isBasicType(String &type);
    
    void                discoverFunctionDependencies(const FunctionInvocation &invoc, FunctionVector &depVector);

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

    StringMap                   mInputToGLStatesMap;            // Map parameter name to a new parameter name (sometimes renaming is required to match names between vertex and fragment shader)
    FunctionMap                 mFunctionCacheMap;              // Map function invocation to body.  Used as a cache to reduce library file reads and for inlining
    StringMap                   mDefinesMap;                    // Map of #defines and the function library that contains them
    ParamContentToStringMap     mContentToPerVertexAttributes;  // Map parameter content to vertex attributes
    int                         mGLSLVersion;                   // Holds the current glsl es version
    StringVector                mFragInputParams;               // Holds the fragment input params 
    StringMap                   mCachedFunctionLibraries;       // Holds the cached function libraries
};

class ShaderProgramWriterGLSLESFactory : public ProgramWriterFactory
{
public:
    ShaderProgramWriterGLSLESFactory() : mLanguage("glsles")
    {
    }
    virtual ~ShaderProgramWriterGLSLESFactory() {}

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

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

private:
    String mLanguage;
};

}
}

#endif