/*

* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:   

*

*/

#include "HuiFxVg10OnscreenRenderbuffer.h"

#include "HuiVg10RenderSurface.h"

#include "HuiVg10RenderPlugin.h"

CHuiFxVg10OnscreenRenderbuffer* CHuiFxVg10OnscreenRenderbuffer::NewL(CHuiVg10RenderPlugin& aPlugin, CHuiVg10RenderSurface& aSurface)

    {

    CHuiFxVg10OnscreenRenderbuffer* e = new (ELeave) CHuiFxVg10OnscreenRenderbuffer();

    CleanupStack::PushL(e);

    e->ConstructL(aPlugin, aSurface);

    CleanupStack::Pop(e);

    return e;

    }

void CHuiFxVg10OnscreenRenderbuffer::ConstructL(CHuiVg10RenderPlugin& aPlugin, CHuiVg10RenderSurface& aSurface)

    {

    CHuiFxRenderbuffer::ConstructL(aSurface.Size(), EBufferTypeOnscreen);

    iPlugin = &aPlugin;

    iSurface = &aSurface;

    iTextureUsage = ERenderbufferUsageReadWrite;

#ifndef __WINS__ // Should possibly query the supported mode instead?

    VGImageFormat imageInternalFormat = VG_sARGB_8888_PRE;

#else

    VGImageFormat imageInternalFormat = VG_sARGB_8888;

#endif

    iImage = vgCreateImage(imageInternalFormat, Size().iWidth, Size().iHeight, VG_IMAGE_QUALITY_NONANTIALIASED);

    HUIFX_VG_INVARIANT();

    // Initialize the context

    iGc = iPlugin->CreateGcL();

    BindAsRenderTarget();

    iGc->InitState();

    UnbindAsRenderTarget();

    // Let renderer know that we have been fiddlling with OpenVg state directly

    // "iGc->InitState" confuses scissoring setting, so lets notify it.

    CHuiVg10RenderPlugin& renderer = CHuiStatic::Vg10Renderer();

    renderer.AddRestoreStateFlags(EHuiVg10GcStateFlagDirtyScissor);    

    renderer.AddRestoreStateFlags(EHuiVg10GcStateFlagDirtyBlendMode);        

    }

CHuiFxVg10OnscreenRenderbuffer::~CHuiFxVg10OnscreenRenderbuffer()

    {

    vgDestroyImage(iImage);

    HUIFX_VG_INVARIANT();

    delete iGc;

    }

CHuiGc& CHuiFxVg10OnscreenRenderbuffer::BindAsRenderTarget()

    {

    // Save current context and surfaces

    iSavedContext = eglGetCurrentContext();

    iSavedDrawSurface = eglGetCurrentSurface(EGL_DRAW);

    iSavedReadSurface = eglGetCurrentSurface(EGL_READ);

    // Bind our own surface

    iSurface->MakeCurrent();

    return *iGc;

    }

void CHuiFxVg10OnscreenRenderbuffer::BindAsTexture(THuiFxRenderbufferUsage aUsage)

    {

    // Copy the contents of the framebuffer into our backbuffer image

    // TODO: figure out a more efficient way of doing this

    iTextureUsage = aUsage;

    if (aUsage == ERenderbufferUsageReadWrite || aUsage == ERenderbufferUsageReadOnly)

        {

        BindAsRenderTarget();

        vgGetPixels(iImage, 0, 0, 0, 0, Size().iWidth, Size().iHeight);

        HUIFX_VG_INVARIANT();

        UnbindAsRenderTarget();

        }

    }

void CHuiFxVg10OnscreenRenderbuffer::UnbindAsTexture()

    {

    // Copy the contents from our backbuffer image to the framebuffer

    if (iTextureUsage == ERenderbufferUsageReadWrite || iTextureUsage == ERenderbufferUsageWriteOnly)

        {

        BindAsRenderTarget();

        vgSetPixels(0, 0, iImage, 0, 0, Size().iWidth, Size().iHeight);

        HUIFX_VG_INVARIANT();

        UnbindAsRenderTarget();

        }

    }

void CHuiFxVg10OnscreenRenderbuffer::UnbindAsRenderTarget()

    {

    // Restore original surface & context

    eglMakeCurrent(iPlugin->EglDisplay(), iSavedDrawSurface, iSavedReadSurface,

                   iSavedContext);

    }

VGImage CHuiFxVg10OnscreenRenderbuffer::Image() const

    {

    return iImage;

    }

void CHuiFxVg10OnscreenRenderbuffer::PrepareForReuse(const TSize& /* aReusedRect */)

    {

    // this should never happen.

    ASSERT(FALSE);

    }