cc/output/output_surface.cc

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/output/output_surface.h"
   6
   7 #include <set>
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/logging.h"
  12 #include "base/string_util.h"
  13 #include "base/strings/string_split.h"
  14 #include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
  15 #include "third_party/khronos/GLES2/gl2.h"
  16 #include "third_party/khronos/GLES2/gl2ext.h"
  17 #include "ui/gfx/rect.h"
  18 #include "ui/gfx/size.h"
  19
  20 using std::set;
  21 using std::string;
  22 using std::vector;
  23
  24 namespace cc {
  25
  26 OutputSurface::OutputSurface(
  27     scoped_ptr<WebKit::WebGraphicsContext3D> context3d)
  28     : client_(NULL),
  29       context3d_(context3d.Pass()),
  30       has_gl_discard_backbuffer_(false) {
  31 }
  32
  33 OutputSurface::OutputSurface(
  34     scoped_ptr<cc::SoftwareOutputDevice> software_device)
  35     : client_(NULL),
  36       software_device_(software_device.Pass()),
  37       has_gl_discard_backbuffer_(false) {
  38 }
  39
  40 OutputSurface::OutputSurface(
  41     scoped_ptr<WebKit::WebGraphicsContext3D> context3d,
  42     scoped_ptr<cc::SoftwareOutputDevice> software_device)
  43     : client_(NULL),
  44       context3d_(context3d.Pass()),
  45       software_device_(software_device.Pass()),
  46       has_gl_discard_backbuffer_(false) {
  47 }
  48
  49 OutputSurface::~OutputSurface() {
  50 }
  51
  52 bool OutputSurface::BindToClient(
  53     cc::OutputSurfaceClient* client) {
  54   DCHECK(client);
  55   client_ = client;
  56   if (!context3d_)
  57     return true;
  58   if (!context3d_->makeContextCurrent())
  59     return false;
  60
  61   string extensions_string = UTF16ToASCII(context3d_->getString(GL_EXTENSIONS));
  62   vector<string> extensions_list;
  63   base::SplitString(extensions_string, ' ', &extensions_list);
  64   set<string> extensions(extensions_list.begin(), extensions_list.end());
  65
  66   has_gl_discard_backbuffer_ =
  67       extensions.count("GL_CHROMIUM_discard_backbuffer") > 0;
  68
  69   return true;
  70 }
  71
  72 void OutputSurface::SendFrameToParentCompositor(CompositorFrame* frame) {
  73   NOTIMPLEMENTED();
  74 }
  75
  76 void OutputSurface::EnsureBackbuffer() {
  77   DCHECK(context3d_);
  78   if (has_gl_discard_backbuffer_)
  79     context3d_->ensureBackbufferCHROMIUM();
  80 }
  81
  82 void OutputSurface::DiscardBackbuffer() {
  83   DCHECK(context3d_);
  84   if (has_gl_discard_backbuffer_)
  85     context3d_->discardBackbufferCHROMIUM();
  86 }
  87
  88 void OutputSurface::Reshape(gfx::Size size) {
  89   DCHECK(context3d_);
  90   context3d_->reshape(size.width(), size.height());
  91 }
  92
  93 void OutputSurface::BindFramebuffer() {
  94   DCHECK(context3d_);
  95   context3d_->bindFramebuffer(GL_FRAMEBUFFER, 0);
  96 }
  97
  98 void OutputSurface::SwapBuffers(const LatencyInfo& latency_info) {
  99   DCHECK(context3d_);
 100   // Note that currently this has the same effect as SwapBuffers; we should
 101   // consider exposing a different entry point on WebGraphicsContext3D.
 102   context3d_->prepareTexture();
 103 }
 104
 105 void OutputSurface::PostSubBuffer(gfx::Rect rect,
 106                                   const LatencyInfo& latency_info) {
 107   DCHECK(context3d_);
 108   context3d_->postSubBufferCHROMIUM(
 109       rect.x(), rect.y(), rect.width(), rect.height());
 110 }
 111
 112 }  // namespace cc