glPatchTable.h

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//
//   Copyright 2015 Pixar
//
//   Licensed under the terms set forth in the LICENSE.txt file available at
//   https://opensubdiv.org/license.
//
 
#ifndef OPENSUBDIV3_OSD_GL_PATCH_TABLE_H
#define OPENSUBDIV3_OSD_GL_PATCH_TABLE_H
 
#include "../version.h"
 
#include "../osd/nonCopyable.h"
#include "../osd/types.h"
 
#include <vector>
 
namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {
 
namespace Far{
    class PatchTable;
};
 
namespace Osd {
 
class GLPatchTable : private NonCopyable<GLPatchTable> {
public:
    using ID = unsigned int;        // GLuint resource ID
    using VertexBufferBinding = ID; // buffer binding type
 
    ~GLPatchTable();
 
    static GLPatchTable *Create(Far::PatchTable const *farPatchTable,
                                void *deviceContext = NULL);

    PatchArrayVector const &GetPatchArrays() const {
        return _patchArrays;
    }

    ID GetPatchIndexBuffer() const {
        return _patchIndexBuffer;
    }

    ID GetPatchParamBuffer() const {
        return _patchParamBuffer;
    }

    ID GetPatchIndexTextureBuffer() const {
        return _patchIndexTexture;
    }

    ID GetPatchParamTextureBuffer() const {
        return _patchParamTexture;
    }

    PatchArrayVector const &GetVaryingPatchArrays() const {
        return _varyingPatchArrays;
    }

    ID GetVaryingPatchIndexBuffer() const {
        return _varyingIndexBuffer;
    }

    ID GetVaryingPatchIndexTextureBuffer() const {
        return _varyingIndexTexture;
    }

    int GetNumFVarChannels() const { return (int)_fvarPatchArrays.size(); }

    PatchArrayVector const &GetFVarPatchArrays(int fvarChannel = 0) const {
        return _fvarPatchArrays[fvarChannel];
    }

    ID GetFVarPatchIndexBuffer(int fvarChannel = 0) const {
        return _fvarIndexBuffers[fvarChannel];
    }

    ID GetFVarPatchIndexTextureBuffer(int fvarChannel = 0) const {
        return _fvarIndexTextures[fvarChannel];
    }

    ID GetFVarPatchParamBuffer(int fvarChannel = 0) const {
        return _fvarParamBuffers[fvarChannel];
    }

    ID GetFVarPatchParamTextureBuffer(int fvarChannel = 0) const {
        return _fvarParamTextures[fvarChannel];
    }
 
protected:
    GLPatchTable();
 
    // allocate buffers from patchTable
    bool allocate(Far::PatchTable const *farPatchTable);
 
    PatchArrayVector _patchArrays;
 
    ID _patchIndexBuffer;
    ID _patchParamBuffer;
 
    ID _patchIndexTexture;
    ID _patchParamTexture;
 
    PatchArrayVector _varyingPatchArrays;
    ID _varyingIndexBuffer;
    ID _varyingIndexTexture;
 
    std::vector<PatchArrayVector> _fvarPatchArrays;
    std::vector<ID> _fvarIndexBuffers;
    std::vector<ID> _fvarIndexTextures;
 
    std::vector<ID> _fvarParamBuffers;
    std::vector<ID> _fvarParamTextures;
};
 
 
}  // end namespace Osd
 
}  // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;
 
}  // end namespace OpenSubdiv
 
#endif  // OPENSUBDIV3_OSD_GL_PATCH_TABLE_H