OpenSubdiv/examples/mayaViewer/OpenSubdivShaderOverride.h

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#ifndef EXAMPLES_MAYAVIEWER_OPENSUBDIVSHADEROVERRIDE_H_
#define EXAMPLES_MAYAVIEWER_OPENSUBDIVSHADEROVERRIDE_H_

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

class OpenSubdivShader;
class OsdMeshData;

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

    virtual ~OpenSubdivShaderOverride();

    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, OsdMeshData *data );

private:
    explicit OpenSubdivShaderOverride(const MObject &obj);

    OpenSubdivShader *_shader;

    MCallbackIdArray _callbackIds;
};

#endif  // EXAMPLES_MAYAVIEWER_OPENSUBDIVSHADEROVERRIDE_H_