libogre-1.8-dev 1.8.1+dfsg-0ubuntu3 / usr / include / OGRE / RTShaderSystem / OgreShaderFFPLighting.h

/*
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*/
#ifndef _ShaderFFPLighting_
#define _ShaderFFPLighting_

#include "OgreShaderPrerequisites.h"
#ifdef RTSHADER_SYSTEM_BUILD_CORE_SHADERS
#include "OgreShaderParameter.h"
#include "OgreShaderSubRenderState.h"
#include "OgreVector4.h"
#include "OgreLight.h"
#include "OgreCommon.h"

namespace Ogre {
namespace RTShader {


/** \addtogroup Core
*  @{
*/
/** \addtogroup RTShader
*  @{
*/

/** Lighting sub render state implementation of the Fixed Function Pipeline.
@see http://msdn.microsoft.com/en-us/library/bb147178.aspx
Derives from SubRenderState class.
*/
class _OgreRTSSExport FFPLighting : public SubRenderState
{

// Interface.
public:
	
	/** Class default constructor */
	FFPLighting();

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

	/** 
	@see SubRenderState::getType.
	*/
	virtual int getExecutionOrder() const;

	/** 
	@see SubRenderState::updateGpuProgramsParams.
	*/
	virtual void updateGpuProgramsParams(Renderable* rend, Pass* pass, const AutoParamDataSource* source, const LightList* pLightList);

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

	/** 
	@see SubRenderState::preAddToRenderState.
	*/
	virtual bool preAddToRenderState(const RenderState* renderState, Pass* srcPass, Pass* dstPass);


	static String Type;

// Protected types:
protected:

	// Per light parameters.
	struct _OgreRTSSExport LightParams
	{
		Light::LightTypes		mType;				// Light type.		
		// Light position.
		UniformParameterPtr mPosition;
		// Light direction.
		UniformParameterPtr mDirection;
		// Attenuation parameters.
		UniformParameterPtr mAttenuatParams;
		// Spot light parameters.
		UniformParameterPtr mSpotParams;
		// Diffuse colour.
		UniformParameterPtr mDiffuseColour;
		// Specular colour.
		UniformParameterPtr mSpecularColour;

	};

	typedef vector<LightParams>::type				LightParamsList;
	typedef LightParamsList::iterator				LightParamsIterator;
	typedef LightParamsList::const_iterator			LightParamsConstIterator;

// Protected methods
protected:
	/** 
	Set the track per vertex colour type. Ambient, Diffuse, Specular and Emissive lighting components source
	can be the vertex colour component. To establish such a link one should provide the matching flags to this
	sub render state.
	*/
	void setTrackVertexColourType(TrackVertexColourType type) { mTrackVertexColourType = type; }

	/** 
	Return the current track per vertex type.
	*/
	TrackVertexColourType getTrackVertexColourType() const { return mTrackVertexColourType; }

	/** 
	Set the light count per light type that this sub render state will generate.
	@see ShaderGenerator::setLightCount.
	*/
	void setLightCount(const int lightCount[3]);

	/** 
	Get the light count per light type that this sub render state will generate.
	@see ShaderGenerator::getLightCount.
	*/
	void getLightCount(int lightCount[3]) const;

	/** 
	Set the specular component state. If set to true this sub render state will compute a specular
	lighting component in addition to the diffuse component.
	@param enable Pass true to enable specular component computation.
	*/
	void setSpecularEnable(bool enable) { mSpecularEnable = enable; }

	/** 
	Get the specular component state. 
	*/
	bool getSpecularEnable() const	  { return mSpecularEnable; }

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

	/** 
	@see SubRenderState::resolveDependencies.
	*/
	virtual bool resolveDependencies(ProgramSet* programSet);

	/** 
	@see SubRenderState::addFunctionInvocations.
	*/
	virtual bool addFunctionInvocations(ProgramSet* programSet);


	/** 
	Internal method that adds global illumination component functions invocations.
	*/
	bool addGlobalIlluminationInvocation(Function* vsMain, const int groupOrder, int& internalCounter);
			
	/** 
	Internal method that adds per light illumination component functions invocations.
	*/
	bool addIlluminationInvocation(LightParams* curLightParams, Function* vsMain, const int groupOrder, int& internalCounter);


// Attributes.
protected:	
	// Track per vertex colour type.
	TrackVertexColourType mTrackVertexColourType;
	// Specular component enabled/disabled.
	bool mSpecularEnable;
	// Light list.
	LightParamsList mLightParamsList;
	// World view matrix parameter.
	UniformParameterPtr mWorldViewMatrix;
	// World view matrix inverse transpose parameter.
	UniformParameterPtr mWorldViewITMatrix;
	// Vertex shader input position parameter.
	ParameterPtr mVSInPosition;
	// Vertex shader input normal.
	ParameterPtr mVSInNormal;
	// Vertex shader diffuse.
	ParameterPtr mVSDiffuse;
	// Vertex shader output diffuse colour parameter.
	ParameterPtr mVSOutDiffuse;
	// Vertex shader output specular colour parameter.
	ParameterPtr mVSOutSpecular;
	// Derived scene colour parameter.
	UniformParameterPtr mDerivedSceneColour;
	// Ambient light colour parameter.
	UniformParameterPtr mLightAmbientColour;
	// Derived ambient light colour parameter.
	UniformParameterPtr mDerivedAmbientLightColour;
	// Surface ambient colour parameter.
	UniformParameterPtr mSurfaceAmbientColour;
	// Surface diffuse colour parameter.
	UniformParameterPtr mSurfaceDiffuseColour;
	// Surface specular colour parameter.
	UniformParameterPtr mSurfaceSpecularColour;
	// Surface emissive colour parameter.
	UniformParameterPtr mSurfaceEmissiveColour;
	// Surface shininess parameter.
	UniformParameterPtr mSurfaceShininess;
	// Shared blank light.
	static Light msBlankLight;

};


/** 
A factory that enables creation of FFPLighting instances.
@remarks Sub class of SubRenderStateFactory
*/
class _OgreRTSSExport FFPLightingFactory : public SubRenderStateFactory
{
public:

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

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

	/** 
	@see SubRenderStateFactory::writeInstance.
	*/
	virtual void writeInstance(MaterialSerializer* ser, SubRenderState* subRenderState, Pass* srcPass, Pass* dstPass);

	
protected:

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


};

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

}
}

#endif
#endif