customTextureShader/customTextureShaderOverride.h

//-
// Copyright 2012 Autodesk, Inc.  All rights reserved.
//
// Use of this software is subject to the terms of the Autodesk license agreement
// provided at the time of installation or download, or which otherwise
// accompanies this software in either electronic or hard copy form.
//+

#ifndef CUSTOMTEXTURESHADEROVERRIDE_H
#define CUSTOMTEXTURESHADEROVERRIDE_H

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


class customTextureShaderOverride : public MHWRender::MPxShaderOverride
{
public:
    customTextureShaderOverride(const MObject& obj);
    static MHWRender::MPxShaderOverride* Creator(const MObject& obj);

    ~customTextureShaderOverride() override;

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

    MHWRender::MShaderInstance* shaderInstance(MHWRender::MDrawContext& context) const override;

    void updateDG(MObject object) override;
    void updateDevice() override;
    void endUpdate() override;

    bool handlesDraw(MHWRender::MDrawContext& context) override;
    void activateKey(MHWRender::MDrawContext& context, const MString& key) override;
    bool draw(MHWRender::MDrawContext& context,const MHWRender::MRenderItemList& renderItemList) const override;
    void terminateKey(MHWRender::MDrawContext& context, const MString& key) override;

    MHWRender::DrawAPI supportedDrawAPIs() const override;
    bool isTransparent() override;
    bool overridesDrawState() override;
    bool supportsMultiDraw() const override;

private:
    void updateShaderInstance();
    void generateCustomTexture();
    void buildAndUpdateCustomDataTextureViaMaya();

    // beauty shader
    MHWRender::MShaderInstance *m_beautyShaderInstance;
    MHWRender::MShaderInstance *m_multiDrawBeautyShaderInstance;

    bool m_shaderBound;
    bool m_inBeautyPass;
    bool m_inMultiDrawMode;

    // custom texture data:
    unsigned char* m_customTextureData;
    MHWRender::MTextureDescription m_desc;
};

#endif