OgreShaderExDualQuaternionSkinning.h

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/*
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(Object-oriented Graphics Rendering Engine)
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The above copyright notice and this permission notice shall be included in
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*/
#ifndef _ShaderExDualQuaternionSkinning_
#define _ShaderExDualQuaternionSkinning_

#include "OgreShaderPrerequisites.h"

#ifdef RTSHADER_SYSTEM_BUILD_EXT_SHADERS
#include "OgreShaderExHardwareSkinningTechnique.h"
#include "OgreShaderParameter.h"
#include "OgreRenderSystem.h"
#include "OgreShaderFunctionAtom.h"

namespace Ogre {
namespace RTShader {

#define SGX_LIB_DUAL_QUATERNION                 "SGXLib_DualQuaternion"
#define SGX_FUNC_BLEND_WEIGHT                   "SGX_BlendWeight"
#define SGX_FUNC_ANTIPODALITY_ADJUSTMENT        "SGX_AntipodalityAdjustment"
#define SGX_FUNC_CALCULATE_BLEND_POSITION       "SGX_CalculateBlendPosition"
#define SGX_FUNC_CALCULATE_BLEND_NORMAL         "SGX_CalculateBlendNormal"
#define SGX_FUNC_NORMALIZE_DUAL_QUATERNION      "SGX_NormalizeDualQuaternion"
#define SGX_FUNC_ADJOINT_TRANSPOSE_MATRIX       "SGX_AdjointTransposeMatrix"
#define SGX_FUNC_BUILD_DUAL_QUATERNION_MATRIX   "SGX_BuildDualQuaternionMatrix"

class _OgreRTSSExport DualQuaternionSkinning : public HardwareSkinningTechnique
{
// Interface.
public:
    DualQuaternionSkinning();

    virtual bool resolveParameters(ProgramSet* programSet);

    virtual bool resolveDependencies(ProgramSet* programSet);

    virtual bool addFunctionInvocations(ProgramSet* programSet);

// Protected methods
protected:
    void addPositionCalculations(Function* vsMain, int& funcCounter);

    void adjustForCorrectAntipodality(Function* vsMain, int index, int& funcCounter, const ParameterPtr& pTempWorldMatrix);

    void addIndexedPositionWeight(Function* vsMain, int index, ParameterPtr& pWorldMatrix,
                                  ParameterPtr& pPositionTempParameter, ParameterPtr& pPositionRelatedOutputParam, int& funcCounter);
    
    void addNormalRelatedCalculations(Function* vsMain,
                                      ParameterPtr& pNormalRelatedParam,
                                      ParameterPtr& pNormalWorldRelatedParam,
                                      int& funcCounter);

protected:
    UniformParameterPtr mParamInScaleShearMatrices;
    ParameterPtr mParamLocalBlendPosition;
    ParameterPtr mParamBlendS;
    ParameterPtr mParamBlendDQ;
    ParameterPtr mParamInitialDQ;
    ParameterPtr mParamTempWorldMatrix;

    ParameterPtr mParamTempFloat2x4;
    ParameterPtr mParamTempFloat3x3;
    ParameterPtr mParamTempFloat3x4;
    
    ParameterPtr mParamIndex1;
    ParameterPtr mParamIndex2;

};

} // namespace RTShader
} // namespace Ogre

#endif // RTSHADER_SYSTEM_BUILD_EXT_SHADERS
#endif // _ShaderExDualQuaternionSkinning_