DrawingBuffer::TextureInfo DrawingBuffer::createDefaultTextureAndAllocateMemory(const IntSize& size)
{
TextureParameters parameters = defaultTextureParameters();
GLuint textureId = createColorTexture(parameters);
texImage2DResourceSafe(parameters.target, 0, parameters.creationInternalColorFormat, size.width(), size.height(), 0, parameters.colorFormat, GL_UNSIGNED_BYTE);
DrawingBuffer::TextureInfo info;
info.textureId = textureId;
info.parameters = parameters;
return info;
}
unsigned DrawingBuffer::createColorTexture(const IntSize& size)
{
if (!m_context)
return 0;
unsigned offscreenColorTexture = m_context->createTexture();
if (!offscreenColorTexture)
return 0;
m_context->bindTexture(GL_TEXTURE_2D, offscreenColorTexture);
m_context->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
m_context->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
m_context->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
m_context->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
if (!size.isEmpty())
texImage2DResourceSafe(GL_TEXTURE_2D, 0, m_internalColorFormat, size.width(), size.height(), 0, m_colorFormat, GL_UNSIGNED_BYTE);
return offscreenColorTexture;
}
PassRefPtr<DrawingBuffer::MailboxInfo> DrawingBuffer::recycledMailbox()
{
if (!m_context || m_recycledMailboxes.isEmpty())
return PassRefPtr<MailboxInfo>();
RefPtr<MailboxInfo> mailboxInfo = m_recycledMailboxes.last().release();
m_recycledMailboxes.removeLast();
if (mailboxInfo->mailbox.syncPoint) {
m_context->waitSyncPoint(mailboxInfo->mailbox.syncPoint);
mailboxInfo->mailbox.syncPoint = 0;
}
if (mailboxInfo->size != m_size) {
m_context->bindTexture(GL_TEXTURE_2D, mailboxInfo->textureId);
texImage2DResourceSafe(GL_TEXTURE_2D, 0, m_internalColorFormat, m_size.width(), m_size.height(), 0, m_colorFormat, GL_UNSIGNED_BYTE);
mailboxInfo->size = m_size;
}
return mailboxInfo.release();
}
void DrawingBuffer::resizeTextureMemory(TextureInfo* info, const IntSize& size)
{
ASSERT(info->textureId);
if (info->imageId) {
deleteChromiumImageForTexture(info);
info->imageId = m_gl->CreateGpuMemoryBufferImageCHROMIUM(size.width(), size.height(), info->parameters.creationInternalColorFormat, GC3D_SCANOUT_CHROMIUM);
if (info->imageId) {
m_gl->BindTexture(info->parameters.target, info->textureId);
m_gl->BindTexImage2DCHROMIUM(info->parameters.target, info->imageId);
clearChromiumImageAlpha(*info);
return;
}
// If the desired texture target is different, there's no way to fall back
// to a non CHROMIUM_image texture.
if (chromiumImageTextureParameters().target != defaultTextureParameters().target)
return;
}
m_gl->BindTexture(info->parameters.target, info->textureId);
texImage2DResourceSafe(info->parameters.target, 0, info->parameters.creationInternalColorFormat, size.width(), size.height(), 0, info->parameters.colorFormat, GL_UNSIGNED_BYTE);
}
bool DrawingBuffer::resizeFramebuffer(const IntSize& size)
{
// resize regular FBO
m_context->bindFramebuffer(GL_FRAMEBUFFER, m_fbo);
m_context->bindTexture(GL_TEXTURE_2D, m_colorBuffer);
texImage2DResourceSafe(GL_TEXTURE_2D, 0, m_internalColorFormat, size.width(), size.height(), 0, m_colorFormat, GL_UNSIGNED_BYTE);
if (m_multisampleMode == ImplicitResolve)
m_context->framebufferTexture2DMultisampleEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_colorBuffer, 0, m_sampleCount);
else
m_context->framebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_colorBuffer, 0);
m_context->bindTexture(GL_TEXTURE_2D, 0);
if (m_multisampleMode != ExplicitResolve)
resizeDepthStencil(size);
if (m_context->checkFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
return false;
return true;
}