//
//     Copyright (C) Pixar. All rights reserved.
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//     This license governs use of the accompanying software. If you
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//
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//     any additions or changes to the software.
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//
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//
#ifndef DELEGATE_H
#define DELEGATE_H

#include <osd/cpuGLVertexBuffer.h>
#include <osd/glDrawContext.h>
#include <osd/glDrawRegistry.h>
#include <osd_util/batch.h>

#include "effect.h"
#include "effectRegistry.h"

class MyDrawContext : public OpenSubdiv::OsdGLDrawContext {
public:
    virtual ~MyDrawContext();

    static MyDrawContext *Create(OpenSubdiv::FarMesh<OpenSubdiv::OsdVertex> const *farMesh,
                                 bool requireFVarData=false);

    static MyDrawContext *Create(OpenSubdiv::FarPatchTables const *patchTables,
                                 bool requireFVarData=false);
//private:
    GLuint vao;

private:
    MyDrawContext();

};

class MyDrawDelegate {
public:
    void BindBatch(OpenSubdiv::OsdUtilMeshBatchBase<MyDrawContext> *batch);
    void UnbindBatch(OpenSubdiv::OsdUtilMeshBatchBase<MyDrawContext> *batch);
    void BindEffect(MyEffect &effect);
    void UnbindEffect(MyEffect &effect);
    void DrawElements(MyEffect &effect, OpenSubdiv::OsdDrawContext::PatchArray const &patchArray);

    void ResetNumDrawCalls() { _numDrawCalls = 0; }
    int GetNumDrawCalls() const { return _numDrawCalls; }

private:
    MyDrawConfig *GetDrawConfig(MyEffect &effect, OpenSubdiv::OsdDrawContext::PatchDescriptor desc);

    MyEffectRegistry _effectRegistry;
    int _numDrawCalls;
};

#endif  /* DELEGATE_H */