OgreInstanceBatchVTF.h

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/*
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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/

Copyright (c) 2000-2014 Torus Knot Software Ltd

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*/
#ifndef __BaseInstanceBatchVTF_H__
#define __BaseInstanceBatchVTF_H__

#include "OgreInstanceBatch.h"
#include "OgreTexture.h"

namespace Ogre
{
    class _OgreExport BaseInstanceBatchVTF : public InstanceBatch
    {
    protected:
        typedef vector<uint8>::type HWBoneIdxVec;
        typedef vector<float>::type HWBoneWgtVec;
        typedef vector<Matrix4>::type Matrix4Vec;

        size_t                  mMatricesPerInstance; //number of bone matrices per instance
        size_t                  mNumWorldMatrices;  //Num bones * num instances
        TexturePtr              mMatrixTexture; //The VTF

        //Used when all matrices from each instance must be in the same row (i.e. HW Instancing).
        //A few pixels are wasted, but resizing the texture puts the danger of not sampling the
        //right pixel... (in theory it should work, but in practice doesn't)
        size_t                  mWidthFloatsPadding;
        size_t                  mMaxFloatsPerLine;

        size_t                  mRowLength;
        size_t                  mWeightCount;
        //Temporary array used to store 3x4 matrices before they are converted to dual quaternions
        float*                  mTempTransformsArray3x4;

        // The state of the usage of bone matrix lookup
        bool mUseBoneMatrixLookup;
        size_t mMaxLookupTableInstances;

        bool mUseBoneDualQuaternions;
        bool mForceOneWeight;
        bool mUseOneWeight;

        void cloneMaterial( const MaterialPtr &material );

        void retrieveBoneIdx( VertexData *baseVertexData, HWBoneIdxVec &outBoneIdx );

        void retrieveBoneIdxWithWeights(VertexData *baseVertexData, HWBoneIdxVec &outBoneIdx, HWBoneWgtVec &outBoneWgt);

        void setupMaterialToUseVTF( TextureType textureType, MaterialPtr &material );

        void createVertexTexture( const SubMesh* baseSubMesh );

        virtual void createVertexSemantics( VertexData *thisVertexData, VertexData *baseVertexData,
                                    const HWBoneIdxVec &hwBoneIdx, const HWBoneWgtVec &hwBoneWgt) = 0;

        size_t convert3x4MatricesToDualQuaternions(float* matrices, size_t numOfMatrices, float* outDualQuaternions);
                                    
        void updateVertexTexture(void);

        virtual bool matricesTogetherPerRow() const = 0;

        virtual void updateSharedLookupIndexes();

        virtual InstancedEntity* generateInstancedEntity(size_t num);

    public:
        BaseInstanceBatchVTF( InstanceManager *creator, MeshPtr &meshReference, const MaterialPtr &material,
                            size_t instancesPerBatch, const Mesh::IndexMap *indexToBoneMap,
                            const String &batchName);
        virtual ~BaseInstanceBatchVTF();

        void buildFrom( const SubMesh *baseSubMesh, const RenderOperation &renderOperation );

        //Renderable overloads
        void getWorldTransforms( Matrix4* xform ) const;
        unsigned short getNumWorldTransforms(void) const;

        void _updateRenderQueue(RenderQueue* queue);

        void setBoneMatrixLookup(bool enable, size_t maxLookupTableInstances) { assert(mInstancedEntities.empty()); 
            mUseBoneMatrixLookup = enable; mMaxLookupTableInstances = maxLookupTableInstances; }

        bool useBoneMatrixLookup() const { return mUseBoneMatrixLookup; }

        void setBoneDualQuaternions(bool enable) { assert(mInstancedEntities.empty());
            mUseBoneDualQuaternions = enable; mRowLength = (mUseBoneDualQuaternions ? 2 : 3); }

        bool useBoneDualQuaternions() const { return mUseBoneDualQuaternions; }

        void setForceOneWeight(bool enable) {  assert(mInstancedEntities.empty());
            mForceOneWeight = enable; }

        bool forceOneWeight() const { return mForceOneWeight; }

        void setUseOneWeight(bool enable) {  assert(mInstancedEntities.empty());
            mUseOneWeight = enable; }

        bool useOneWeight() const { return mUseOneWeight; }

        virtual bool useBoneWorldMatrices() const { return !mUseBoneMatrixLookup; }

        virtual size_t getMaxLookupTableInstances() const { return mMaxLookupTableInstances; }
        
    };

    class _OgreExport InstanceBatchVTF : public BaseInstanceBatchVTF
    {
        
        void setupVertices( const SubMesh* baseSubMesh );
        void setupIndices( const SubMesh* baseSubMesh );

        void createVertexSemantics( VertexData *thisVertexData, VertexData *baseVertexData,
            const HWBoneIdxVec &hwBoneIdx, const HWBoneWgtVec &hwBoneWgt );

        virtual bool matricesTogetherPerRow() const { return false; }
    public:
        InstanceBatchVTF( InstanceManager *creator, MeshPtr &meshReference, const MaterialPtr &material,
                            size_t instancesPerBatch, const Mesh::IndexMap *indexToBoneMap,
                            const String &batchName);
        virtual ~InstanceBatchVTF();

        size_t calculateMaxNumInstances( const SubMesh *baseSubMesh, uint16 flags ) const;
    };
}

#endif