viewOverrideTrackTexture/viewOverrideTrackTexture.h

#ifndef viewOverrideTrackTexture_h_
#define viewOverrideTrackTexture_h_
//-
// Copyright 2015 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.
//+
#include <maya/MString.h>
#include <maya/MViewport2Renderer.h>
#include <maya/MShaderManager.h>
#include <maya/MTextureManager.h>

//
// Simple override class derived from MRenderOverride
//
class viewOverrideTrackTexture : public MHWRender::MRenderOverride
{
public:
    viewOverrideTrackTexture( const MString & name );
    virtual ~viewOverrideTrackTexture();
    virtual MHWRender::DrawAPI supportedDrawAPIs() const;

    // Basic setup and cleanup
    virtual MStatus setup( const MString & destination );
    virtual MStatus cleanup();

    // Operation iteration methods
    virtual bool startOperationIterator();
    virtual MHWRender::MRenderOperation * renderOperation();
    virtual bool nextRenderOperation();

    // UI name
    virtual MString uiName() const
    {
        return mUIName;
    }
    
protected:
    // UI name 
    MString mUIName;

    // Operations and operation names
    MHWRender::MRenderOperation* mOperations[2];
    MString mOperationNames[2];

    // Temporary of operation iteration
    int mCurrentOperation;

    MHWRender::MTexture *mTexture;
};

//
// Image blit used to perform the 'scene render'
//
class TextureBlit : public MHWRender::MQuadRender
{
public:
    TextureBlit(const MString &name);
    ~TextureBlit();

    virtual const MHWRender::MShaderInstance * shader();
    virtual MHWRender::MClearOperation & clearOperation();

    inline void setColorTexture(MHWRender::MTexture* texture)
    {
        mColorTexture.texture = texture;
        mColorTextureChanged = true;
    }

protected:
    // Shader to use for the quad render
    MHWRender::MShaderInstance *mShaderInstance;
    // Texture used for the quad render. Not owned by operation.
    MHWRender::MTextureAssignment mColorTexture;
    bool mColorTextureChanged;
};

#endif