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// Copyright (c) 2013 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 "cc/output/output_surface.h"
#include <set>
#include <string>
#include <vector>
#include "base/logging.h"
#include "base/string_util.h"
#include "base/strings/string_split.h"
#include "cc/output/output_surface_client.h"
#include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
#include "third_party/khronos/GLES2/gl2.h"
#include "third_party/khronos/GLES2/gl2ext.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/size.h"
using std::set;
using std::string;
using std::vector;
namespace cc {
class OutputSurfaceCallbacks :
public WebKit::WebGraphicsContext3D::WebGraphicsSwapBuffersCompleteCallbackCHROMIUM,
public WebKit::WebGraphicsContext3D::WebGraphicsContextLostCallback {
public:
explicit OutputSurfaceCallbacks(OutputSurfaceClient* client)
: client_(client) {}
// WK:WGC3D::WGSwapBuffersCompleteCallbackCHROMIUM implementation.
virtual void onSwapBuffersComplete() {
client_->OnSwapBuffersComplete();
}
// WK:WGC3D::WGContextLostCallback implementation.
virtual void onContextLost() {
client_->DidLoseOutputSurface();
}
private:
OutputSurfaceClient* client_;
};
OutputSurface::OutputSurface(
scoped_ptr<WebKit::WebGraphicsContext3D> context3d)
: client_(NULL),
context3d_(context3d.Pass()),
has_gl_discard_backbuffer_(false) {
}
OutputSurface::OutputSurface(
scoped_ptr<cc::SoftwareOutputDevice> software_device)
: client_(NULL),
software_device_(software_device.Pass()),
has_gl_discard_backbuffer_(false) {
}
OutputSurface::OutputSurface(
scoped_ptr<WebKit::WebGraphicsContext3D> context3d,
scoped_ptr<cc::SoftwareOutputDevice> software_device)
: client_(NULL),
context3d_(context3d.Pass()),
software_device_(software_device.Pass()),
has_gl_discard_backbuffer_(false) {
}
OutputSurface::~OutputSurface() {
}
bool OutputSurface::BindToClient(
cc::OutputSurfaceClient* client) {
DCHECK(client);
client_ = client;
if (!context3d_)
return true;
if (!context3d_->makeContextCurrent())
return false;
string extensions_string = UTF16ToASCII(context3d_->getString(GL_EXTENSIONS));
vector<string> extensions_list;
base::SplitString(extensions_string, ' ', &extensions_list);
set<string> extensions(extensions_list.begin(), extensions_list.end());
has_gl_discard_backbuffer_ =
extensions.count("GL_CHROMIUM_discard_backbuffer") > 0;
callbacks_.reset(new OutputSurfaceCallbacks(client_));
context3d_->setSwapBuffersCompleteCallbackCHROMIUM(callbacks_.get());
context3d_->setContextLostCallback(callbacks_.get());
return true;
}
void OutputSurface::SendFrameToParentCompositor(CompositorFrame* frame) {
NOTIMPLEMENTED();
}
void OutputSurface::EnsureBackbuffer() {
DCHECK(context3d_);
if (has_gl_discard_backbuffer_)
context3d_->ensureBackbufferCHROMIUM();
}
void OutputSurface::DiscardBackbuffer() {
DCHECK(context3d_);
if (has_gl_discard_backbuffer_)
context3d_->discardBackbufferCHROMIUM();
}
void OutputSurface::Reshape(gfx::Size size) {
DCHECK(context3d_);
context3d_->reshape(size.width(), size.height());
}
void OutputSurface::BindFramebuffer() {
DCHECK(context3d_);
context3d_->bindFramebuffer(GL_FRAMEBUFFER, 0);
}
void OutputSurface::SwapBuffers(const LatencyInfo& latency_info) {
DCHECK(context3d_);
// Note that currently this has the same effect as SwapBuffers; we should
// consider exposing a different entry point on WebGraphicsContext3D.
context3d_->prepareTexture();
}
void OutputSurface::PostSubBuffer(gfx::Rect rect,
const LatencyInfo& latency_info) {
DCHECK(context3d_);
context3d_->postSubBufferCHROMIUM(
rect.x(), rect.y(), rect.width(), rect.height());
}
} // namespace cc
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