void LayerTextureUpdaterSkPicture::updateTextureRect(LayerTexture* texture, const IntRect& sourceRect, const IntRect& destRect)
{
if (m_createFrameBuffer) {
deleteFrameBuffer();
createFrameBuffer();
m_createFrameBuffer = false;
}
if (!m_fbo)
return;
// Bind texture.
context()->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_fbo);
texture->framebufferTexture2D();
ASSERT(context()->checkFramebufferStatus(GraphicsContext3D::FRAMEBUFFER) == GraphicsContext3D::FRAMEBUFFER_COMPLETE);
// Notify SKIA to sync its internal GL state.
m_skiaContext->resetContext();
m_canvas->save();
m_canvas->clipRect(SkRect(destRect));
// Translate the origin of contentRect to that of destRect.
// Note that destRect is defined relative to sourceRect.
m_canvas->translate(contentRect().x() - sourceRect.x() + destRect.x(),
contentRect().y() - sourceRect.y() + destRect.y());
m_canvas->drawPicture(m_picture);
m_canvas->restore();
// Flush SKIA context so that all the rendered stuff appears on the texture.
m_skiaContext->flush(GrContext::kForceCurrentRenderTarget_FlushBit);
// Unbind texture.
context()->framebufferTexture2D(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::COLOR_ATTACHMENT0, GraphicsContext3D::TEXTURE_2D, 0, 0);
context()->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, 0);
}
bool LayerTextureUpdaterSkPicture::createFrameBuffer()
{
ASSERT(!m_fbo);
ASSERT(!m_bufferSize.isEmpty());
// SKIA only needs color and stencil buffers, not depth buffer.
// But it is very uncommon for cards to support color + stencil FBO config.
// The most common config is color + packed-depth-stencil.
// Instead of iterating through all possible FBO configs, we only try the
// most common one here.
// FIXME: Delegate the task of creating frame-buffer to SKIA.
// It has all necessary code to iterate through all possible configs
// and choose the one most suitable for its purposes.
Extensions3D* extensions = context()->getExtensions();
if (!extensions->supports("GL_OES_packed_depth_stencil"))
return false;
extensions->ensureEnabled("GL_OES_packed_depth_stencil");
// Create and bind a frame-buffer-object.
m_fbo = context()->createFramebuffer();
if (!m_fbo)
return false;
context()->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_fbo);
// We just need to create a stencil buffer for FBO.
// The color buffer (texture) will be provided by tiles.
// SKIA does not need depth buffer.
m_depthStencilBuffer = context()->createRenderbuffer();
if (!m_depthStencilBuffer) {
deleteFrameBuffer();
return false;
}
context()->bindRenderbuffer(GraphicsContext3D::RENDERBUFFER, m_depthStencilBuffer);
context()->renderbufferStorage(GraphicsContext3D::RENDERBUFFER, Extensions3D::DEPTH24_STENCIL8, m_bufferSize.width(), m_bufferSize.height());
context()->framebufferRenderbuffer(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::DEPTH_ATTACHMENT, GraphicsContext3D::RENDERBUFFER, m_depthStencilBuffer);
context()->framebufferRenderbuffer(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::STENCIL_ATTACHMENT, GraphicsContext3D::RENDERBUFFER, m_depthStencilBuffer);
// Create a skia gpu canvas.
GrContext* skiaContext = m_context->grContext();
GrPlatformSurfaceDesc targetDesc;
targetDesc.reset();
targetDesc.fSurfaceType = kRenderTarget_GrPlatformSurfaceType;
targetDesc.fRenderTargetFlags = kNone_GrPlatformRenderTargetFlagBit;
targetDesc.fWidth = m_bufferSize.width();
targetDesc.fHeight = m_bufferSize.height();
targetDesc.fConfig = kRGBA_8888_GrPixelConfig;
targetDesc.fStencilBits = 8;
targetDesc.fPlatformRenderTarget = m_fbo;
SkAutoTUnref<GrRenderTarget> target(static_cast<GrRenderTarget*>(skiaContext->createPlatformSurface(targetDesc)));
SkAutoTUnref<SkDevice> device(new SkGpuDevice(skiaContext, target.get()));
m_canvas = adoptPtr(new SkCanvas(device.get()));
context()->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, 0);
return true;
}
void LayerTextureUpdaterSkPicture::updateTextureRect(GraphicsContext3D* compositorContext, TextureAllocator* allocator, ManagedTexture* texture, const IntRect& sourceRect, const IntRect& destRect)
{
ASSERT(!m_context || m_context == compositorContext);
m_context = compositorContext;
if (m_createFrameBuffer) {
deleteFrameBuffer();
createFrameBuffer();
m_createFrameBuffer = false;
}
if (!m_fbo)
return;
// Bind texture.
context()->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_fbo);
texture->framebufferTexture2D(context(), allocator);
ASSERT(context()->checkFramebufferStatus(GraphicsContext3D::FRAMEBUFFER) == GraphicsContext3D::FRAMEBUFFER_COMPLETE);
// Make sure SKIA uses the correct GL context.
context()->makeContextCurrent();
GrContext* skiaContext = m_context->grContext();
// Notify SKIA to sync its internal GL state.
skiaContext->resetContext();
m_canvas->save();
m_canvas->clipRect(SkRect(destRect));
// Translate the origin of contentRect to that of destRect.
// Note that destRect is defined relative to sourceRect.
m_canvas->translate(contentRect().x() - sourceRect.x() + destRect.x(),
contentRect().y() - sourceRect.y() + destRect.y());
m_canvas->drawPicture(m_picture);
m_canvas->restore();
// Flush SKIA context so that all the rendered stuff appears on the texture.
skiaContext->flush();
// Unbind texture.
context()->framebufferTexture2D(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::COLOR_ATTACHMENT0, GraphicsContext3D::TEXTURE_2D, 0, 0);
context()->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, 0);
}
LayerTextureUpdaterSkPicture::~LayerTextureUpdaterSkPicture()
{
deleteFrameBuffer();
}