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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/compositor/offscreen_browser_compositor_output_surface.h"
#include "base/logging.h"
#include "cc/output/compositor_frame.h"
#include "cc/output/compositor_frame_ack.h"
#include "cc/output/gl_frame_data.h"
#include "cc/output/output_surface_client.h"
#include "cc/resources/resource_provider.h"
#include "content/browser/compositor/browser_compositor_overlay_candidate_validator.h"
#include "content/browser/compositor/reflector_impl.h"
#include "content/browser/compositor/reflector_texture.h"
#include "content/common/gpu/client/context_provider_command_buffer.h"
#include "content/public/browser/browser_thread.h"
#include "gpu/command_buffer/client/context_support.h"
#include "gpu/command_buffer/client/gles2_interface.h"
#include "third_party/khronos/GLES2/gl2.h"
#include "third_party/khronos/GLES2/gl2ext.h"
using cc::CompositorFrame;
using cc::GLFrameData;
using cc::ResourceProvider;
using gpu::gles2::GLES2Interface;
namespace content {
OffscreenBrowserCompositorOutputSurface::
OffscreenBrowserCompositorOutputSurface(
const scoped_refptr<ContextProviderCommandBuffer>& context,
const scoped_refptr<ui::CompositorVSyncManager>& vsync_manager,
scoped_ptr<BrowserCompositorOverlayCandidateValidator>
overlay_candidate_validator)
: BrowserCompositorOutputSurface(context,
vsync_manager,
overlay_candidate_validator.Pass()),
fbo_(0),
is_backbuffer_discarded_(false),
weak_ptr_factory_(this) {
capabilities_.max_frames_pending = 1;
capabilities_.uses_default_gl_framebuffer = false;
}
OffscreenBrowserCompositorOutputSurface::
~OffscreenBrowserCompositorOutputSurface() {
DiscardBackbuffer();
}
void OffscreenBrowserCompositorOutputSurface::EnsureBackbuffer() {
is_backbuffer_discarded_ = false;
if (!reflector_texture_.get()) {
reflector_texture_.reset(new ReflectorTexture(context_provider()));
GLES2Interface* gl = context_provider_->ContextGL();
int max_texture_size =
context_provider_->ContextCapabilities().gpu.max_texture_size;
int texture_width = std::min(max_texture_size, surface_size_.width());
int texture_height = std::min(max_texture_size, surface_size_.height());
cc::ResourceFormat format = cc::RGBA_8888;
gl->BindTexture(GL_TEXTURE_2D, reflector_texture_->texture_id());
gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
gl->TexImage2D(GL_TEXTURE_2D, 0, GLInternalFormat(format),
texture_width, texture_height, 0,
GLDataFormat(format), GLDataType(format), nullptr);
if (!fbo_)
gl->GenFramebuffers(1, &fbo_);
gl->BindFramebuffer(GL_FRAMEBUFFER, fbo_);
gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D, reflector_texture_->texture_id(),
0);
reflector_->OnSourceTextureMailboxUpdated(
reflector_texture_->mailbox());
}
}
void OffscreenBrowserCompositorOutputSurface::DiscardBackbuffer() {
is_backbuffer_discarded_ = true;
GLES2Interface* gl = context_provider_->ContextGL();
if (reflector_texture_) {
reflector_texture_.reset();
if (reflector_)
reflector_->OnSourceTextureMailboxUpdated(nullptr);
}
if (fbo_) {
gl->BindFramebuffer(GL_FRAMEBUFFER, fbo_);
gl->DeleteFramebuffers(1, &fbo_);
fbo_ = 0;
}
}
void OffscreenBrowserCompositorOutputSurface::Reshape(const gfx::Size& size,
float scale_factor) {
if (size == surface_size_)
return;
surface_size_ = size;
device_scale_factor_ = scale_factor;
DiscardBackbuffer();
EnsureBackbuffer();
}
void OffscreenBrowserCompositorOutputSurface::BindFramebuffer() {
bool need_to_bind = !!reflector_texture_.get();
EnsureBackbuffer();
DCHECK(reflector_texture_.get());
if (need_to_bind) {
GLES2Interface* gl = context_provider_->ContextGL();
gl->BindFramebuffer(GL_FRAMEBUFFER, fbo_);
}
}
void OffscreenBrowserCompositorOutputSurface::SwapBuffers(
cc::CompositorFrame* frame) {
if (reflector_) {
if (frame->gl_frame_data->sub_buffer_rect ==
gfx::Rect(frame->gl_frame_data->size))
reflector_->OnSourceSwapBuffers();
else
reflector_->OnSourcePostSubBuffer(frame->gl_frame_data->sub_buffer_rect);
}
client_->DidSwapBuffers();
// TODO(oshima): sync with the reflector's SwapBuffersComplete
// (crbug.com/520567).
// The original implementation had a flickering issue (crbug.com/515332).
uint32_t sync_point =
context_provider_->ContextGL()->InsertSyncPointCHROMIUM();
context_provider_->ContextSupport()->SignalSyncPoint(
sync_point, base::Bind(&OutputSurface::OnSwapBuffersComplete,
weak_ptr_factory_.GetWeakPtr()));
}
void OffscreenBrowserCompositorOutputSurface::OnReflectorChanged() {
if (reflector_)
EnsureBackbuffer();
}
base::Closure
OffscreenBrowserCompositorOutputSurface::CreateCompositionStartedCallback() {
return base::Closure();
}
#if defined(OS_MACOSX)
bool OffscreenBrowserCompositorOutputSurface::
SurfaceShouldNotShowFramesAfterSuspendForRecycle() const {
return true;
}
#endif
} // namespace content
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