CCIOSurfaceLayerImpl.cpp   [plain text]

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
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#include "config.h"

#if USE(ACCELERATED_COMPOSITING)

#include "cc/CCIOSurfaceLayerImpl.h"

#include "Extensions3DChromium.h"
#include "GraphicsContext3D.h"
#include "LayerRendererChromium.h"
#include "cc/CCIOSurfaceDrawQuad.h"
#include "cc/CCProxy.h"
#include "cc/CCQuadCuller.h"

namespace WebCore {

CCIOSurfaceLayerImpl::CCIOSurfaceLayerImpl(int id)
    : CCLayerImpl(id)
    , m_ioSurfaceId(0)
    , m_ioSurfaceChanged(false)
    , m_ioSurfaceTextureId(0)
{
}

CCIOSurfaceLayerImpl::~CCIOSurfaceLayerImpl()
{
    // FIXME: it seems there is no layer renderer / GraphicsContext3D available here. Ideally we
    // would like to delete m_ioSurfaceTextureId.
    m_ioSurfaceTextureId = 0;
}

void CCIOSurfaceLayerImpl::willDraw(LayerRendererChromium* layerRenderer)
{
    CCLayerImpl::willDraw(layerRenderer);

    if (m_ioSurfaceChanged) {
        GraphicsContext3D* context = layerRenderer->context();
        Extensions3DChromium* extensions = static_cast<Extensions3DChromium*>(context->getExtensions());
        ASSERT(extensions->supports("GL_CHROMIUM_iosurface"));
        ASSERT(extensions->supports("GL_ARB_texture_rectangle"));

        if (!m_ioSurfaceTextureId)
            m_ioSurfaceTextureId = context->createTexture();

        GLC(context, context->activeTexture(GraphicsContext3D::TEXTURE0));
        GLC(context, context->bindTexture(Extensions3D::TEXTURE_RECTANGLE_ARB, m_ioSurfaceTextureId));
        GLC(context, context->texParameteri(Extensions3D::TEXTURE_RECTANGLE_ARB, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR));
        GLC(context, context->texParameteri(Extensions3D::TEXTURE_RECTANGLE_ARB, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::LINEAR));
        GLC(context, context->texParameteri(Extensions3D::TEXTURE_RECTANGLE_ARB, GraphicsContext3D::TEXTURE_WRAP_S, GraphicsContext3D::CLAMP_TO_EDGE));
        GLC(context, context->texParameteri(Extensions3D::TEXTURE_RECTANGLE_ARB, GraphicsContext3D::TEXTURE_WRAP_T, GraphicsContext3D::CLAMP_TO_EDGE));
        extensions->texImageIOSurface2DCHROMIUM(Extensions3D::TEXTURE_RECTANGLE_ARB,
                                                m_ioSurfaceSize.width(),
                                                m_ioSurfaceSize.height(),
                                                m_ioSurfaceId,
                                                0);
        // Do not check for error conditions. texImageIOSurface2DCHROMIUM is supposed to hold on to
        // the last good IOSurface if the new one is already closed. This is only a possibility
        // during live resizing of plugins. However, it seems that this is not sufficient to
        // completely guard against garbage being drawn. If this is found to be a significant issue,
        // it may be necessary to explicitly tell the embedder when to free the surfaces it has
        // allocated.
        m_ioSurfaceChanged = false;
    }
}

void CCIOSurfaceLayerImpl::appendQuads(CCQuadCuller& quadList, const CCSharedQuadState* sharedQuadState, bool&)
{
    IntRect quadRect(IntPoint(), bounds());
    quadList.append(CCIOSurfaceDrawQuad::create(sharedQuadState, quadRect, m_ioSurfaceSize, m_ioSurfaceTextureId));
}

void CCIOSurfaceLayerImpl::dumpLayerProperties(TextStream& ts, int indent) const
{
    writeIndent(ts, indent);
    ts << "iosurface id: " << m_ioSurfaceId << " texture id: " << m_ioSurfaceTextureId;
    CCLayerImpl::dumpLayerProperties(ts, indent);
}

void CCIOSurfaceLayerImpl::didLoseContext()
{
    // We don't have a valid texture ID in the new context; however,
    // the IOSurface is still valid.
    m_ioSurfaceTextureId = 0;
    m_ioSurfaceChanged = true;
}

void CCIOSurfaceLayerImpl::setIOSurfaceProperties(unsigned ioSurfaceId, const IntSize& size)
{
    if (m_ioSurfaceId != ioSurfaceId)
        m_ioSurfaceChanged = true;

    m_ioSurfaceId = ioSurfaceId;
    m_ioSurfaceSize = size;
}
}

#endif // USE(ACCELERATED_COMPOSITING)