bool Canvas2DLayerBridge::prepareMailbox(WebExternalTextureMailbox* outMailbox, WebExternalBitmap* bitmap)
{
ASSERT(isAccelerated());
if (m_destructionInProgress) {
// It can be hit in the following sequence.
// 1. Canvas draws something.
// 2. The compositor begins the frame.
// 3. Javascript makes a context be lost.
// 4. Here.
return false;
}
if (bitmap) {
// Using accelerated 2d canvas with software renderer, which
// should only happen in tests that use fake graphics contexts
// or in Android WebView in software mode. In this case, we do
// not care about producing any results for this canvas.
skipQueuedDrawCommands();
m_lastImageId = 0;
return false;
}
if (!checkSurfaceValid())
return false;
WebGraphicsContext3D* webContext = context();
RefPtr<SkImage> image = newImageSnapshot(PreferAcceleration);
// Early exit if canvas was not drawn to since last prepareMailbox
GLenum filter = m_filterQuality == kNone_SkFilterQuality ? GL_NEAREST : GL_LINEAR;
if (image->uniqueID() == m_lastImageId && filter == m_lastFilter)
return false;
m_lastImageId = image->uniqueID();
m_lastFilter = filter;
{
MailboxInfo tmp;
tmp.m_image = image;
tmp.m_parentLayerBridge = this;
m_mailboxes.prepend(tmp);
}
MailboxInfo& mailboxInfo = m_mailboxes.first();
mailboxInfo.m_mailbox.nearestNeighbor = filter == GL_NEAREST;
GrContext* grContext = m_contextProvider->grContext();
if (!grContext)
return true; // for testing: skip gl stuff when using a mock graphics context.
// Need to flush skia's internal queue because texture is about to be accessed directly
grContext->flush();
ASSERT(image->getTexture());
// Because of texture sharing with the compositor, we must invalidate
// the state cached in skia so that the deferred copy on write
// in SkSurface_Gpu does not make any false assumptions.
mailboxInfo.m_image->getTexture()->textureParamsModified();
webContext->bindTexture(GL_TEXTURE_2D, mailboxInfo.m_image->getTexture()->getTextureHandle());
webContext->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter);
webContext->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
webContext->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
webContext->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
// Re-use the texture's existing mailbox, if there is one.
if (image->getTexture()->getCustomData()) {
ASSERT(image->getTexture()->getCustomData()->size() == sizeof(mailboxInfo.m_mailbox.name));
memcpy(&mailboxInfo.m_mailbox.name[0], image->getTexture()->getCustomData()->data(), sizeof(mailboxInfo.m_mailbox.name));
} else {
context()->genMailboxCHROMIUM(mailboxInfo.m_mailbox.name);
RefPtr<SkData> mailboxNameData = adoptRef(SkData::NewWithCopy(&mailboxInfo.m_mailbox.name[0], sizeof(mailboxInfo.m_mailbox.name)));
image->getTexture()->setCustomData(mailboxNameData.get());
webContext->produceTextureCHROMIUM(GL_TEXTURE_2D, mailboxInfo.m_mailbox.name);
}
if (isHidden()) {
// With hidden canvases, we release the SkImage immediately because
// there is no need for animations to be double buffered.
mailboxInfo.m_image.clear();
} else {
// FIXME: We'd rather insert a syncpoint than perform a flush here,
// but currentlythe canvas will flicker if we don't flush here.
webContext->flush();
// mailboxInfo.m_mailbox.syncPoint = webContext->insertSyncPoint();
}
webContext->bindTexture(GL_TEXTURE_2D, 0);
// Because we are changing the texture binding without going through skia,
// we must dirty the context.
grContext->resetContext(kTextureBinding_GrGLBackendState);
*outMailbox = mailboxInfo.m_mailbox;
return true;
}
// static
bool WebGLDrawBuffers::satisfiesWebGLRequirements(WebGLRenderingContextBase* webglContext)
{
WebGraphicsContext3D* context = webglContext->webContext();
Extensions3DUtil* extensionsUtil = webglContext->extensionsUtil();
// This is called after we make sure GL_EXT_draw_buffers is supported.
GLint maxDrawBuffers = 0;
GLint maxColorAttachments = 0;
context->getIntegerv(GL_MAX_DRAW_BUFFERS_EXT, &maxDrawBuffers);
context->getIntegerv(GL_MAX_COLOR_ATTACHMENTS_EXT, &maxColorAttachments);
if (maxDrawBuffers < 4 || maxColorAttachments < 4)
return false;
Platform3DObject fbo = context->createFramebuffer();
context->bindFramebuffer(GL_FRAMEBUFFER, fbo);
const unsigned char* buffer = 0; // Chromium doesn't allow init data for depth/stencil tetxures.
bool supportsDepth = (extensionsUtil->supportsExtension("GL_CHROMIUM_depth_texture")
|| extensionsUtil->supportsExtension("GL_OES_depth_texture")
|| extensionsUtil->supportsExtension("GL_ARB_depth_texture"));
bool supportsDepthStencil = (extensionsUtil->supportsExtension("GL_EXT_packed_depth_stencil")
|| extensionsUtil->supportsExtension("GL_OES_packed_depth_stencil"));
Platform3DObject depthStencil = 0;
if (supportsDepthStencil) {
depthStencil = context->createTexture();
context->bindTexture(GL_TEXTURE_2D, depthStencil);
context->texImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_STENCIL_OES, 1, 1, 0, GL_DEPTH_STENCIL_OES, GL_UNSIGNED_INT_24_8_OES, buffer);
}
Platform3DObject depth = 0;
if (supportsDepth) {
depth = context->createTexture();
context->bindTexture(GL_TEXTURE_2D, depth);
context->texImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, 1, 1, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, buffer);
}
Vector<Platform3DObject> colors;
bool ok = true;
GLint maxAllowedBuffers = std::min(maxDrawBuffers, maxColorAttachments);
for (GLint i = 0; i < maxAllowedBuffers; ++i) {
Platform3DObject color = context->createTexture();
colors.append(color);
context->bindTexture(GL_TEXTURE_2D, color);
context->texImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
context->framebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i, GL_TEXTURE_2D, color, 0);
if (context->checkFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
ok = false;
break;
}
if (supportsDepth) {
context->framebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depth, 0);
if (context->checkFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
ok = false;
break;
}
context->framebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
}
if (supportsDepthStencil) {
context->framebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depthStencil, 0);
context->framebufferTexture2D(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_TEXTURE_2D, depthStencil, 0);
if (context->checkFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
ok = false;
break;
}
context->framebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
context->framebufferTexture2D(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
}
}
webglContext->restoreCurrentFramebuffer();
context->deleteFramebuffer(fbo);
webglContext->restoreCurrentTexture2D();
if (supportsDepth)
context->deleteTexture(depth);
if (supportsDepthStencil)
context->deleteTexture(depthStencil);
for (size_t i = 0; i < colors.size(); ++i)
context->deleteTexture(colors[i]);
return ok;
}