OgreShaderExLayeredBlending.h

Go to the documentation of this file.

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

Copyright (c) 2000-2012 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 _OgreShaderExLayeredBlending_
#define _OgreShaderExLayeredBlending_

#include "OgreShaderPrerequisites.h"
#ifdef RTSHADER_SYSTEM_BUILD_EXT_SHADERS
#include "OgreShaderFFPTexturing.h"
#include "OgreShaderProgramSet.h"
#include "OgreShaderParameter.h"
#include "OgreShaderFunction.h"
#include "OgreShaderSubRenderState.h"

namespace Ogre {
namespace RTShader {

#define SGX_LIB_LAYEREDBLENDING     "SGXLib_LayeredBlending"

class _OgreRTSSExport LayeredBlending : public FFPTexturing
{
public:
    enum BlendMode
    {
        LB_Invalid = -1,
        LB_FFPBlend,
        LB_BlendNormal,
        LB_BlendLighten,            
        LB_BlendDarken,     
        LB_BlendMultiply,
        LB_BlendAverage,    
        LB_BlendAdd,
        LB_BlendSubtract,
        LB_BlendDifference,
        LB_BlendNegation,
        LB_BlendExclusion,
        LB_BlendScreen,
        LB_BlendOverlay,
        LB_BlendSoftLight,
        LB_BlendHardLight,
        LB_BlendColorDodge,
        LB_BlendColorBurn, 
        LB_BlendLinearDodge,
        LB_BlendLinearBurn,
        LB_BlendLinearLight,
        LB_BlendVividLight,
        LB_BlendPinLight,
        LB_BlendHardMix,
        LB_BlendReflect,
        LB_BlendGlow,
        LB_BlendPhoenix,
        LB_BlendSaturation,
        LB_BlendColor,
        LB_BlendLuminosity,
        LB_MaxBlendModes
    };

    enum SourceModifier
    {
        SM_Invalid = -1,
        SM_None,
        SM_Source1Modulate,
        SM_Source2Modulate,
        SM_Source1InvModulate,
        SM_Source2InvModulate,
        SM_MaxSourceModifiers
    };

    struct TextureBlend
    {
        TextureBlend() : blendMode(LB_Invalid), sourceModifier(SM_Invalid), customNum(0) {}

        BlendMode blendMode; //The blend mode to use
        SourceModifier sourceModifier; //The source modification to use
        int customNum; // The number of the custom param controlling the source modification
        ParameterPtr modControlParam; //The parameter controlling the source modification
    };


    LayeredBlending();

    virtual const Ogre::String& getType                 () const;


    void setBlendMode(unsigned short index, BlendMode mode);

    BlendMode getBlendMode(unsigned short index) const;

    

    void setSourceModifier(unsigned short index, SourceModifier modType, int customNum);

    bool getSourceModifier(unsigned short index, SourceModifier& , int& customNum) const;

    virtual void copyFrom               (const SubRenderState& rhs);

    static String Type;

// Protected methods
protected:
    
    virtual bool resolveParameters(ProgramSet* programSet);

    virtual bool resolveDependencies(Ogre::RTShader::ProgramSet* programSet);


    virtual void addPSBlendInvocations(Function* psMain, 
                                    ParameterPtr arg1,
                                    ParameterPtr arg2,
                                    ParameterPtr texel,
                                    int samplerIndex,
                                    const LayerBlendModeEx& blendMode,
                                    const int groupOrder, 
                                    int& internalCounter,
                                    int targetChannels);
    void addPSModifierInvocation(Function* psMain, 
                                int samplerIndex, 
                                ParameterPtr arg1,
                                ParameterPtr arg2,
                                const int groupOrder, 
                                int& internalCounter,
                                int targetChannels);

    // Attributes.
protected:
    vector<TextureBlend>::type mTextureBlends;

};



class LayeredBlendingFactory : public SubRenderStateFactory
{
public:

    virtual const String&   getType             () const;

    virtual SubRenderState* createInstance      (ScriptCompiler* compiler, PropertyAbstractNode* prop, TextureUnitState* texState, SGScriptTranslator* translator);

    virtual void            writeInstance       (MaterialSerializer* ser, SubRenderState* subRenderState, const TextureUnitState* srcTextureUnit, const TextureUnitState* dstTextureUnit);

    
protected:

    virtual SubRenderState* createInstanceImpl  ();

    LayeredBlending::BlendMode stringToBlendMode(const String &strValue);
    String blendModeToString(LayeredBlending::BlendMode blendMode);

    LayeredBlending::SourceModifier stringToSourceModifier(const String &strValue);
    
    String sourceModifierToString(LayeredBlending::SourceModifier modifier);

    LayeredBlending* createOrRetrieveSubRenderState(SGScriptTranslator* translator);
};

}
}

#endif
#endif