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#ifndef OSD_D3D11L_DRAW_CONTEXT_H
#define OSD_D3D11L_DRAW_CONTEXT_H

#include "../version.h"

#include "../far/mesh.h"
#include "../osd/drawContext.h"
#include "../osd/vertex.h"

#include <map>

struct ID3D11VertexShader;
struct ID3D11HullShader;
struct ID3D11DomainShader;
struct ID3D11GeometryShader;
struct ID3D11PixelShader;

struct ID3D11Buffer;
struct ID3D11ShaderResourceView;
struct ID3D11Device;
struct ID3D11DeviceContext;

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

class OsdD3D11DrawContext : public OsdDrawContext {
public:
    typedef ID3D11Buffer * VertexBufferBinding;

    OsdD3D11DrawContext();
    virtual ~OsdD3D11DrawContext();

    template<class VERTEX_BUFFER>
    static OsdD3D11DrawContext *
    Create(FarMesh<OsdVertex> *farMesh,
           VERTEX_BUFFER *vertexBuffer,
           ID3D11DeviceContext *pd3d11DeviceContext,
           bool requirePtexCoordinates = false,
           bool requireFVarData = false) {
        
        if (not vertexBuffer)
            return NULL;

        OsdD3D11DrawContext * instance = new OsdD3D11DrawContext();
        if (instance->allocate(farMesh,
                        vertexBuffer->BindD3D11Buffer(pd3d11DeviceContext),
                        vertexBuffer->GetNumElements(),
                        pd3d11DeviceContext,
                        requirePtexCoordinates,
                        requireFVarData)) return instance;
        delete instance;
        return NULL;
    }

    ID3D11Buffer             *patchIndexBuffer;

    ID3D11Buffer             *ptexCoordinateBuffer;
    ID3D11Buffer             *ptexCoordinateBufferSRV;
    ID3D11Buffer             *fvarDataBuffer;
    ID3D11Buffer             *fvarDataBufferSRV;

    ID3D11ShaderResourceView *vertexBufferSRV;
    ID3D11Buffer             *vertexValenceBuffer;
    ID3D11ShaderResourceView *vertexValenceBufferSRV;
    ID3D11Buffer             *quadOffsetBuffer;
    ID3D11ShaderResourceView *quadOffsetBufferSRV;
    ID3D11Buffer             *patchLevelBuffer;
    ID3D11ShaderResourceView *patchLevelBufferSRV;

private:
    bool allocate(FarMesh<OsdVertex> *farmesh,
                  ID3D11Buffer *vertexBuffer,
                  int numElements,
                  ID3D11DeviceContext *pd3d11DeviceContext,
                  bool requirePtexCoordinates,
                  bool requireFVarData);

    void _AppendPatchArray(
            unsigned int *indexBuffer, int *indexBase,
            unsigned int *levelBuffer, int *levelBase,
            FarPatchTables::PTable const & ptable,
            FarPatchTables::PtexCoordinateTable const & ptexTable,
            FarPatchTables::FVarDataTable const & fvarTable, int fvarDataWidth,
            OsdPatchDescriptor const & desc,
            int gregoryQuadOffsetBase);
};

} // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;

} // end namespace OpenSubdiv

#endif /* OSD_D3D11L_DRAW_CONTEXT_H */