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

Copyright (c) 2000-2014 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

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,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-----------------------------------------------------------------------------
*/
#ifndef __ShaderProgramWriterCG_H__
#define __ShaderProgramWriterCG_H__

#include "OgreShaderPrerequisites.h"
#include "OgreShaderProgramWriterManager.h"
#include "OgreShaderProgramWriter.h"
#include "OgreShaderParameter.h"

namespace Ogre {
namespace RTShader {

    class Function;
    class FunctionAtom;
    class Program;

/** \addtogroup Optional
*  @{
*/
/** \addtogroup RTShader
*  @{
*/

/** CG target language writer implementation.
@see ProgramWriter.
*/
class _OgreRTSSExport CGProgramWriter : public ProgramWriter
{

// Interface.
public:

    /** Class constructor. 
    */
    CGProgramWriter();

    /** Class destructor */
    virtual ~CGProgramWriter();

    /** 
    @see ProgramWriter::writeSourceCode.
    */
    virtual void writeSourceCode(std::ostream& os, Program* program);

    /** 
    @see ProgramWriter::getTargetLanguage.
    */
    virtual const String& getTargetLanguage() const { return TargetLanguage; }

    static String TargetLanguage;

// Protected methods.
protected:

    /** Initialize string maps. */
    void initializeStringMaps();

    /** Write the program dependencies. */
    void writeProgramDependencies(std::ostream& os, Program* program);
    
    /** Write a uniform parameter. */
    void writeUniformParameter(std::ostream& os, UniformParameterPtr parameter);

    /** Write a function parameter. */
    void writeFunctionParameter(std::ostream& os, ParameterPtr parameter);

    /** Write a local parameter. */
    void writeLocalParameter(std::ostream& os, ParameterPtr parameter);

    /** Write a function declaration. */
    void writeFunctionDeclaration(std::ostream& os, Function* function);

    /** Write function atom instance. */
    void writeAtomInstance(std::ostream& os, FunctionAtom* atom);


protected:
    typedef std::map<GpuConstantType, const char*> GpuConstTypeToStringMap;
    typedef std::map<Parameter::Semantic, const char*> ParamSemanticToStringMap;

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

/** CG program writer factory implementation.
@see ProgramWriterFactory
*/
class _OgreRTSSExport ShaderProgramWriterCGFactory : public ProgramWriterFactory
{
public:
    ShaderProgramWriterCGFactory() : mLanguage("cg")
    {
    }
    virtual ~ShaderProgramWriterCGFactory() {}

    /** 
    @see ProgramWriterFactory::getTargetLanguage
    */
    virtual const String& getTargetLanguage(void) const
    {
        return mLanguage;
    }

    /** 
    @see ProgramWriterFactory::create
    */
    virtual ProgramWriter* create(void)
    {
        return OGRE_NEW CGProgramWriter();
    }

private:
    String mLanguage;

};

/** @} */
/** @} */
}
}

#endif
