void CCLayerTreeHostImpl::calculateRenderPasses(CCRenderPassList& passes, CCLayerList& renderSurfaceLayerList)
{
renderSurfaceLayerList.append(rootLayer());
if (!rootLayer()->renderSurface())
rootLayer()->createRenderSurface();
rootLayer()->renderSurface()->clearLayerList();
rootLayer()->renderSurface()->setContentRect(IntRect(IntPoint(), viewportSize()));
rootLayer()->setClipRect(IntRect(IntPoint(), viewportSize()));
{
TransformationMatrix identityMatrix;
TRACE_EVENT("CCLayerTreeHostImpl::calcDrawEtc", this, 0);
CCLayerTreeHostCommon::calculateDrawTransformsAndVisibility(rootLayer(), rootLayer(), identityMatrix, identityMatrix, renderSurfaceLayerList, rootLayer()->renderSurface()->layerList(), &m_layerSorter, layerRendererCapabilities().maxTextureSize);
}
if (layerRendererCapabilities().usingPartialSwap)
trackDamageForAllSurfaces(rootLayer(), renderSurfaceLayerList);
m_rootDamageRect = rootLayer()->renderSurface()->damageTracker()->currentDamageRect();
for (int surfaceIndex = renderSurfaceLayerList.size() - 1; surfaceIndex >= 0 ; --surfaceIndex) {
CCLayerImpl* renderSurfaceLayer = renderSurfaceLayerList[surfaceIndex];
CCRenderSurface* renderSurface = renderSurfaceLayer->renderSurface();
OwnPtr<CCRenderPass> pass = CCRenderPass::create(renderSurface);
FloatRect surfaceDamageRect;
if (layerRendererCapabilities().usingPartialSwap)
surfaceDamageRect = damageInSurfaceSpace(renderSurfaceLayer, m_rootDamageRect);
pass->setSurfaceDamageRect(surfaceDamageRect);
const CCLayerList& layerList = renderSurface->layerList();
for (unsigned layerIndex = 0; layerIndex < layerList.size(); ++layerIndex) {
CCLayerImpl* layer = layerList[layerIndex];
if (layer->visibleLayerRect().isEmpty())
continue;
if (CCLayerTreeHostCommon::renderSurfaceContributesToTarget(layer, renderSurfaceLayer->id())) {
pass->appendQuadsForRenderSurfaceLayer(layer);
continue;
}
layer->willDraw(m_layerRenderer.get());
pass->appendQuadsForLayer(layer);
}
passes.append(pass.release());
}
}
void CCLayerTreeHostImpl::trackDamageForAllSurfaces(CCLayerImpl* rootDrawLayer, const CCLayerList& renderSurfaceLayerList)
{
// For now, we use damage tracking to compute a global scissor. To do this, we must
// compute all damage tracking before drawing anything, so that we know the root
// damage rect. The root damage rect is then used to scissor each surface.
for (int surfaceIndex = renderSurfaceLayerList.size() - 1; surfaceIndex >= 0 ; --surfaceIndex) {
CCLayerImpl* renderSurfaceLayer = renderSurfaceLayerList[surfaceIndex];
CCRenderSurface* renderSurface = renderSurfaceLayer->renderSurface();
ASSERT(renderSurface);
renderSurface->damageTracker()->updateDamageTrackingState(renderSurface->layerList(), renderSurfaceLayer->id(), renderSurfaceLayer->maskLayer());
}
}
void LayerRendererChromium::drawLayersInternal()
{
if (viewportSize().isEmpty() || !rootLayer())
return;
TRACE_EVENT("LayerRendererChromium::drawLayers", this, 0);
CCLayerImpl* rootDrawLayer = rootLayer();
makeContextCurrent();
if (!rootDrawLayer->renderSurface())
rootDrawLayer->createRenderSurface();
rootDrawLayer->renderSurface()->setContentRect(IntRect(IntPoint(), viewportSize()));
rootDrawLayer->setScissorRect(IntRect(IntPoint(), viewportSize()));
CCLayerList renderSurfaceLayerList;
renderSurfaceLayerList.append(rootDrawLayer);
m_defaultRenderSurface = rootDrawLayer->renderSurface();
m_defaultRenderSurface->clearLayerList();
{
TRACE_EVENT("LayerRendererChromium::drawLayersInternal::calcDrawEtc", this, 0);
CCLayerTreeHostCommon::calculateDrawTransformsAndVisibility(rootDrawLayer, rootDrawLayer, m_zoomAnimatorTransform, m_zoomAnimatorTransform, renderSurfaceLayerList, m_defaultRenderSurface->layerList(), &m_layerSorter, m_capabilities.maxTextureSize);
}
// The GL viewport covers the entire visible area, including the scrollbars.
GLC(m_context.get(), m_context->viewport(0, 0, viewportWidth(), viewportHeight()));
m_windowMatrix = screenMatrix(0, 0, viewportWidth(), viewportHeight());
// Bind the common vertex attributes used for drawing all the layers.
m_sharedGeometry->prepareForDraw();
GLC(m_context.get(), m_context->disable(GraphicsContext3D::SCISSOR_TEST));
GLC(m_context.get(), m_context->disable(GraphicsContext3D::DEPTH_TEST));
GLC(m_context.get(), m_context->disable(GraphicsContext3D::CULL_FACE));
useRenderSurface(m_defaultRenderSurface);
if (m_zoomAnimatorTransform.isIdentity())
// Clear to blue to make it easier to spot unrendered regions.
m_context->clearColor(0, 0, 1, 1);
else
// Clear to grey, as zoom animation may leave unrendered regions.
// FIXME(wjmaclean): Render some interesting texture in unrendered regions.
m_context->clearColor(0.25, 0.25, 0.25, 1);
m_context->colorMask(true, true, true, true);
m_context->clear(GraphicsContext3D::COLOR_BUFFER_BIT);
GLC(m_context.get(), m_context->enable(GraphicsContext3D::BLEND));
GLC(m_context.get(), m_context->blendFunc(GraphicsContext3D::ONE, GraphicsContext3D::ONE_MINUS_SRC_ALPHA));
GLC(m_context.get(), m_context->enable(GraphicsContext3D::SCISSOR_TEST));
// Update the contents of the render surfaces. We traverse the array from
// back to front to guarantee that nested render surfaces get rendered in the
// correct order.
for (int surfaceIndex = renderSurfaceLayerList.size() - 1; surfaceIndex >= 0 ; --surfaceIndex) {
CCLayerImpl* renderSurfaceLayer = renderSurfaceLayerList[surfaceIndex].get();
CCRenderSurface* renderSurface = renderSurfaceLayer->renderSurface();
ASSERT(renderSurface);
renderSurface->setSkipsDraw(true);
// Render surfaces whose drawable area has zero width or height
// will have no layers associated with them and should be skipped.
if (!renderSurface->layerList().size())
continue;
// Skip completely transparent render surfaces.
if (!renderSurface->drawOpacity())
continue;
if (useRenderSurface(renderSurface)) {
renderSurface->setSkipsDraw(false);
if (renderSurfaceLayer != rootDrawLayer) {
GLC(m_context.get(), m_context->disable(GraphicsContext3D::SCISSOR_TEST));
GLC(m_context.get(), m_context->clearColor(0, 0, 0, 0));
GLC(m_context.get(), m_context->clear(GraphicsContext3D::COLOR_BUFFER_BIT));
GLC(m_context.get(), m_context->enable(GraphicsContext3D::SCISSOR_TEST));
}
const CCLayerList& layerList = renderSurface->layerList();
for (unsigned layerIndex = 0; layerIndex < layerList.size(); ++layerIndex)
drawLayer(layerList[layerIndex].get(), renderSurface);
}
}
if (m_headsUpDisplay->enabled()) {
GLC(m_context.get(), m_context->enable(GraphicsContext3D::BLEND));
GLC(m_context.get(), m_context->blendFunc(GraphicsContext3D::ONE, GraphicsContext3D::ONE_MINUS_SRC_ALPHA));
GLC(m_context.get(), m_context->disable(GraphicsContext3D::SCISSOR_TEST));
useRenderSurface(m_defaultRenderSurface);
m_headsUpDisplay->draw();
}
GLC(m_context.get(), m_context->disable(GraphicsContext3D::SCISSOR_TEST));
GLC(m_context.get(), m_context->disable(GraphicsContext3D::BLEND));
}
