libogre-1.9-dev 1.9.0+dfsg1-1 / usr / include / OGRE / RTShaderSystem / OgreShaderExLayeredBlending.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/

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The above copyright notice and this permission notice shall be included in
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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*/
#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"

/** Texturing sub render state implementation of layered blending.
Derives from FFPTexturing class which derives from SubRenderState class.
*/
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) {}

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


	/** Class default constructor */
	LayeredBlending();

	/** 
	@see SubRenderState::getType.
	*/
	virtual const Ogre::String&	getType					() const;


	/** 
	Set the blend mode of the given texture unit layer with the previous layer.
	@param index The texture unit texture. Textures units (index-1) and (index) will be blended.
	@param mode The blend mode to apply.
	*/
	void setBlendMode(unsigned short index, BlendMode mode);

	/** 
	Return the blend mode of the given texture unit index.
	*/
	BlendMode getBlendMode(unsigned short index) const;

	

	/** 
	Set the source modifier parameters for a given texture unit
	@param modType The source modification type to use
	@param customNum The custom parameter number used to control the modification
	*/
	void setSourceModifier(unsigned short index, SourceModifier modType, int customNum);

	/** 
	Returns the source modifier parameters for a given texture unit
	@return True if a valid modifier exist for the given texture unit
    @param index Texture blend index
	@param modType The source modification type to use
	@param customNum The custom parameter number used to control the modification
	*/
	bool getSourceModifier(unsigned short index, SourceModifier& modType, int& customNum) const;

	/** 
	@see SubRenderState::copyFrom.
	*/
	virtual void copyFrom(const SubRenderState& rhs);

    static String Type;

// Protected methods
protected:
    
    /** 
    @see SubRenderState::resolveParameters.
    */
    virtual bool resolveParameters(ProgramSet* programSet);

    /** 
    @see SubRenderState::resolveDependencies.
    */
    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);
    /** 
    Adds the function invocation to the pixel shader which will modify
    the blend sources according to the source modification parameters.
    */
    void addPSModifierInvocation(Function* psMain, 
                                 int samplerIndex, 
                                 ParameterPtr arg1,
                                 ParameterPtr arg2,
                                 const int groupOrder, 
                                 int& internalCounter,
                                 int targetChannels);

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

};



/** 
A factory that enables creation of LayeredBlending instances.
@remarks Sub class of SubRenderStateFactory
*/
class LayeredBlendingFactory : public SubRenderStateFactory
{
public:

	/** 
	@see SubRenderStateFactory::getType.
	*/
	virtual const String& getType() const;

	/** 
	@see SubRenderStateFactory::createInstance.
	*/
	virtual SubRenderState* createInstance(ScriptCompiler* compiler, PropertyAbstractNode* prop, TextureUnitState* texState, SGScriptTranslator* translator);

	/** 
	@see SubRenderStateFactory::writeInstance.
	*/
	virtual void writeInstance(MaterialSerializer* ser, SubRenderState* subRenderState, const TextureUnitState* srcTextureUnit, const TextureUnitState* dstTextureUnit);

    
protected:

	/** 
	@see SubRenderStateFactory::createInstanceImpl.
	*/
	virtual SubRenderState* createInstanceImpl();

	/** 
	@Converts string to Enum
	*/
	LayeredBlending::BlendMode stringToBlendMode(const String &strValue);
	/** 
	@Converts Enum to string
	*/
	String blendModeToString(LayeredBlending::BlendMode blendMode);

	/** 
	@Converts string to Enum
	*/
	LayeredBlending::SourceModifier stringToSourceModifier(const String &strValue);
	
	/** 
	@Converts Enum to string
	*/
	String sourceModifierToString(LayeredBlending::SourceModifier modifier);

	/** 
	Returns the LayeredBlending sub-rener state previously created for this material/pass.
	if no such sub-render state exists creates a new one
	@param translator compiler
	*/
	LayeredBlending* createOrRetrieveSubRenderState(SGScriptTranslator* translator);
};

} // namespace RTShader
} // namespace Ogre

#endif // RTSHADER_SYSTEM_BUILD_EXT_SHADERS
#endif // _OgreShaderExLayeredBlending_