GraphicsContext3D* WebGLLayerChromium::context() const
{
if (drawingBuffer())
return drawingBuffer()->graphicsContext3D().get();
return 0;
}
void WebGLLayerChromium::updateCompositorResources(GraphicsContext3D* rendererContext, CCTextureUpdater&)
{
if (!drawsContent())
return;
if (!m_needsDisplay)
return;
if (m_textureChanged) {
rendererContext->bindTexture(GraphicsContext3D::TEXTURE_2D, m_textureId);
// Set the min-mag filters to linear and wrap modes to GL_CLAMP_TO_EDGE
// to get around NPOT texture limitations of GLES.
rendererContext->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR);
rendererContext->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::LINEAR);
rendererContext->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_S, GraphicsContext3D::CLAMP_TO_EDGE);
rendererContext->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_T, GraphicsContext3D::CLAMP_TO_EDGE);
m_textureChanged = false;
}
// Update the contents of the texture used by the compositor.
if (m_needsDisplay && m_textureUpdated) {
// publishToPlatformLayer prepares the contents of the off-screen render target for use by the compositor.
drawingBuffer()->publishToPlatformLayer();
context()->markLayerComposited();
m_updateRect = FloatRect(FloatPoint(), bounds());
m_needsDisplay = false;
m_textureUpdated = false;
}
}
void WebGLLayerChromium::paintContentsIfDirty(const Region&)
{
if (!drawsContent() || !m_needsDisplay || !m_textureUpdated)
return;
drawingBuffer()->publishToPlatformLayer();
context()->markLayerComposited();
m_needsDisplay = false;
m_textureUpdated = false;
m_contextLost = context()->getExtensions()->getGraphicsResetStatusARB() != GraphicsContext3D::NO_ERROR;
}