/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2014 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-----------------------------------------------------------------------------
*/

#ifndef RENDERSYSTEMS_GLSUPPORT_INCLUDE_OGREGLHARDWAREPIXELBUFFERCOMMON_H_
#define RENDERSYSTEMS_GLSUPPORT_INCLUDE_OGREGLHARDWAREPIXELBUFFERCOMMON_H_

#include "OgreGLSupportPrerequisites.h"
#include "OgreTexture.h"
#include "OgreHardwarePixelBuffer.h"

namespace Ogre
{

class _OgreGLExport GLHardwarePixelBufferCommon : public HardwarePixelBuffer
{
protected:
    /// Lock a box
    PixelBox lockImpl(const Box &lockBox,  LockOptions options) override;

    /// Unlock a box
    void unlockImpl(void) override;

    // Internal buffer; either on-card or in system memory, freed/allocated on demand
    // depending on buffer usage
    PixelBox mBuffer;
    uint32 mGLInternalFormat; // GL internal format

    // Buffer allocation/freeage
    void allocateBuffer();

    void freeBuffer();

    // Upload a box of pixels to this buffer on the card
    virtual void upload(const PixelBox &data, const Box &dest);

    // Download a box of pixels from the card
    virtual void download(const PixelBox &data);

    virtual bool needsConversion(PixelFormat format) { return format != mFormat; }

    void _blitFromMemory(const PixelBox &src, const Box& dst);

public:
    /// Should be called by HardwareBufferManager
    GLHardwarePixelBufferCommon(uint32 mWidth, uint32 mHeight, uint32 mDepth,
                               PixelFormat mFormat,
                               HardwareBuffer::Usage usage);

    virtual ~GLHardwarePixelBufferCommon();

    /** Bind surface to frame buffer. Needs FBO extension.
     */
    virtual void bindToFramebuffer(uint32 attachment, uint32 zoffset);

    uint32 getGLFormat() { return mGLInternalFormat; }
};

} /* namespace Ogre */

#endif /* RENDERSYSTEMS_GLSUPPORT_INCLUDE_OGREGLHARDWAREPIXELBUFFERCOMMON_H_ */