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#ifndef EXAMPLES_MAYAPTEXVIEWER_OPENSUBDIVPTEXSHADEROVERRIDE_H_
#define EXAMPLES_MAYAPTEXVIEWER_OPENSUBDIVPTEXSHADEROVERRIDE_H_

#include <maya/MPxShaderOverride.h>
#include <maya/MCallbackIdArray.h>

class OpenSubdivPtexShader;
class OsdPtexMeshData;

class OpenSubdivPtexShaderOverride : public MHWRender::MPxShaderOverride 
{
public:
    static MHWRender::MPxShaderOverride* creator(const MObject &obj);

    virtual ~OpenSubdivPtexShaderOverride();

    virtual MString initialize(const MInitContext &initContext,
                               MInitFeedback &initFeedback);

    virtual void updateDG(MObject object);

    virtual void updateDevice();

    virtual void endUpdate();

    virtual bool draw(MHWRender::MDrawContext &context,
                      const MHWRender::MRenderItemList &renderItemList) const;

    virtual bool rebuildAlways() { return false; }
    virtual MHWRender::DrawAPI supportedDrawAPIs() const { return MHWRender::kOpenGL; }
    virtual bool isTransparent() { return true; }

    static void attrChangedCB(MNodeMessage::AttributeMessage msg, MPlug& plug, MPlug& otherPlug, void* );
    void addTopologyChangedCallbacks( const MDagPath& dagPath, OsdPtexMeshData *data );

private:
    explicit OpenSubdivPtexShaderOverride(const MObject &obj);

    OpenSubdivPtexShader *_shader;

    MCallbackIdArray _callbackIds;

    int _level;
};

#endif  // EXAMPLES_MAYAPTEXVIEWER_OPENSUBDIVPTEXSHADEROVERRIDE_H_