OpenSubdiv/opensubdiv/osd/drawContext.h

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#ifndef OSD_DRAW_CONTEXT_H
#define OSD_DRAW_CONTEXT_H

#include "../version.h"
#include "../far/patchTables.h"

#include <utility>
#include <string>

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

class OsdDrawContext {
public:
    class PatchDescriptor {
    public:
        PatchDescriptor(FarPatchTables::Descriptor farDesc, unsigned char maxValence,
                    unsigned char subPatch, unsigned char numElements) :
            _farDesc(farDesc), _maxValence(maxValence), _subPatch(subPatch), _numElements(numElements) { }


        /// Returns the type of the patch
        FarPatchTables::Type GetType() const {
            return _farDesc.GetType();
        }

        /// Returns the transition pattern of the patch if any (5 types)
        FarPatchTables::TransitionPattern GetPattern() const {
            return _farDesc.GetPattern();
        }

        /// Returns the rotation of the patch (4 rotations)
        unsigned char GetRotation() const {
            return _farDesc.GetRotation();
        }

        /// Returns the number of control vertices expected for a patch of the
        /// type described
        int GetNumControlVertices() const {
            return _farDesc.GetNumControlVertices();
        }

        /// Returns the max valence
        int GetMaxValence() const {
            return _maxValence;
        }

        /// Returns the subpatch id
        int GetSubPatch() const {
            return _subPatch;
        }

        /// Returns the number of vertex elements
        int GetNumElements() const {
            return _numElements;
        }

        /// Allows ordering of patches by type
        bool operator < ( PatchDescriptor const other ) const;

        /// True if the descriptors are identical
        bool operator == ( PatchDescriptor const other ) const;

    private:
        FarPatchTables::Descriptor _farDesc;
        unsigned char _maxValence;
        unsigned char _subPatch;
        unsigned char _numElements;
    };

    class PatchArray {
    public:
        PatchArray(PatchDescriptor desc, FarPatchTables::PatchArray::ArrayRange const & range) :
            _desc(desc), _range(range) { }

        /// Returns a patch descriptor defining the type of patches in the array
        PatchDescriptor GetDescriptor() const {
            return _desc;
        }

        /// Returns a array range struct
        FarPatchTables::PatchArray::ArrayRange const & GetArrayRange() const {
            return _range;
        }

        /// Returns the index of the first control vertex of the first patch
        /// of this array in the global PTable
        unsigned int GetVertIndex() const {
            return _range.vertIndex;
        }

        /// Returns the global index of the first patch in this array (Used to
        /// access ptex / fvar table data)
        unsigned int GetPatchIndex() const {
            return _range.patchIndex;
        }

        /// Returns the number of patches in the array
        unsigned int GetNumPatches() const {
            return _range.npatches;
        }

        /// Returns the number of patch indices in the array
        unsigned int GetNumIndices() const {
            return _range.npatches * _desc.GetNumControlVertices();
        }

        unsigned int GetQuadOffsetIndex() const {
            return _range.quadOffsetIndex;
        }

    private:
        PatchDescriptor _desc;
        FarPatchTables::PatchArray::ArrayRange _range;
    };

    typedef std::vector<PatchArray> PatchArrayVector;

    OsdDrawContext() : _isAdaptive(false) {}
    virtual ~OsdDrawContext();

    bool IsAdaptive() const { return _isAdaptive; }

    PatchArrayVector patchArrays;

protected:
    void createPatchArrays(FarPatchTables const * patchTables, int numElements);

    bool _isAdaptive;
};

} // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;

} // end namespace OpenSubdiv

#endif /* OSD_DRAW_CONTEXT_H */