content/browser/compositor/offscreen_browser_compositor_output_surface.cc

   1 // Copyright 2015 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 "content/browser/compositor/offscreen_browser_compositor_output_surface.h"
   6
   7 #include "base/logging.h"
   8 #include "cc/output/compositor_frame.h"
   9 #include "cc/output/compositor_frame_ack.h"
  10 #include "cc/output/gl_frame_data.h"
  11 #include "cc/output/output_surface_client.h"
  12 #include "cc/resources/resource_provider.h"
  13 #include "content/browser/compositor/browser_compositor_overlay_candidate_validator.h"
  14 #include "content/browser/compositor/reflector_impl.h"
  15 #include "content/browser/compositor/reflector_texture.h"
  16 #include "content/common/gpu/client/context_provider_command_buffer.h"
  17 #include "content/public/browser/browser_thread.h"
  18 #include "gpu/command_buffer/client/context_support.h"
  19 #include "gpu/command_buffer/client/gles2_interface.h"
  20 #include "third_party/khronos/GLES2/gl2.h"
  21 #include "third_party/khronos/GLES2/gl2ext.h"
  22
  23 using cc::CompositorFrame;
  24 using cc::GLFrameData;
  25 using cc::ResourceProvider;
  26 using gpu::gles2::GLES2Interface;
  27
  28 namespace content {
  29
  30 OffscreenBrowserCompositorOutputSurface::
  31     OffscreenBrowserCompositorOutputSurface(
  32         const scoped_refptr<ContextProviderCommandBuffer>& context,
  33         const scoped_refptr<ui::CompositorVSyncManager>& vsync_manager,
  34         scoped_ptr<BrowserCompositorOverlayCandidateValidator>
  35             overlay_candidate_validator)
  36     : BrowserCompositorOutputSurface(context,
  37                                      vsync_manager,
  38                                      overlay_candidate_validator.Pass()),
  39       fbo_(0),
  40       is_backbuffer_discarded_(false),
  41       weak_ptr_factory_(this) {
  42   capabilities_.max_frames_pending = 1;
  43   capabilities_.uses_default_gl_framebuffer = false;
  44 }
  45
  46 OffscreenBrowserCompositorOutputSurface::
  47     ~OffscreenBrowserCompositorOutputSurface() {
  48   DiscardBackbuffer();
  49 }
  50
  51 void OffscreenBrowserCompositorOutputSurface::EnsureBackbuffer() {
  52   is_backbuffer_discarded_ = false;
  53
  54   if (!reflector_texture_.get()) {
  55     reflector_texture_.reset(new ReflectorTexture(context_provider()));
  56
  57     GLES2Interface* gl = context_provider_->ContextGL();
  58
  59     int max_texture_size =
  60         context_provider_->ContextCapabilities().gpu.max_texture_size;
  61     int texture_width = std::min(max_texture_size, surface_size_.width());
  62     int texture_height = std::min(max_texture_size, surface_size_.height());
  63
  64     cc::ResourceFormat format = cc::RGBA_8888;
  65     gl->BindTexture(GL_TEXTURE_2D, reflector_texture_->texture_id());
  66     gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  67     gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  68     gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  69     gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  70     gl->TexImage2D(GL_TEXTURE_2D, 0, GLInternalFormat(format),
  71                    texture_width, texture_height, 0,
  72                    GLDataFormat(format), GLDataType(format), nullptr);
  73     if (!fbo_)
  74       gl->GenFramebuffers(1, &fbo_);
  75
  76     gl->BindFramebuffer(GL_FRAMEBUFFER, fbo_);
  77     gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
  78                              GL_TEXTURE_2D, reflector_texture_->texture_id(),
  79                              0);
  80     reflector_->OnSourceTextureMailboxUpdated(
  81         reflector_texture_->mailbox());
  82   }
  83 }
  84
  85 void OffscreenBrowserCompositorOutputSurface::DiscardBackbuffer() {
  86   is_backbuffer_discarded_ = true;
  87
  88   GLES2Interface* gl = context_provider_->ContextGL();
  89
  90   if (reflector_texture_) {
  91     reflector_texture_.reset();
  92     if (reflector_)
  93       reflector_->OnSourceTextureMailboxUpdated(nullptr);
  94   }
  95
  96   if (fbo_) {
  97     gl->BindFramebuffer(GL_FRAMEBUFFER, fbo_);
  98     gl->DeleteFramebuffers(1, &fbo_);
  99     fbo_ = 0;
 100   }
 101 }
 102
 103 void OffscreenBrowserCompositorOutputSurface::Reshape(const gfx::Size& size,
 104                                                       float scale_factor) {
 105   if (size == surface_size_)
 106     return;
 107
 108   surface_size_ = size;
 109   device_scale_factor_ = scale_factor;
 110   DiscardBackbuffer();
 111   EnsureBackbuffer();
 112 }
 113
 114 void OffscreenBrowserCompositorOutputSurface::BindFramebuffer() {
 115   bool need_to_bind = !!reflector_texture_.get();
 116   EnsureBackbuffer();
 117   DCHECK(reflector_texture_.get());
 118
 119   if (need_to_bind) {
 120     GLES2Interface* gl = context_provider_->ContextGL();
 121     gl->BindFramebuffer(GL_FRAMEBUFFER, fbo_);
 122   }
 123 }
 124
 125 void OffscreenBrowserCompositorOutputSurface::SwapBuffers(
 126     cc::CompositorFrame* frame) {
 127   if (reflector_) {
 128     if (frame->gl_frame_data->sub_buffer_rect ==
 129         gfx::Rect(frame->gl_frame_data->size))
 130       reflector_->OnSourceSwapBuffers();
 131     else
 132       reflector_->OnSourcePostSubBuffer(frame->gl_frame_data->sub_buffer_rect);
 133   }
 134
 135   client_->DidSwapBuffers();
 136 }
 137
 138 void OffscreenBrowserCompositorOutputSurface::OnReflectorChanged() {
 139   if (reflector_)
 140     EnsureBackbuffer();
 141 }
 142
 143 base::Closure
 144 OffscreenBrowserCompositorOutputSurface::CreateCompositionStartedCallback() {
 145   return base::Bind(&OutputSurface::OnSwapBuffersComplete,
 146                     weak_ptr_factory_.GetWeakPtr());
 147 }
 148
 149 #if defined(OS_MACOSX)
 150
 151 bool OffscreenBrowserCompositorOutputSurface::
 152 SurfaceShouldNotShowFramesAfterSuspendForRecycle() const {
 153   return true;
 154 }
 155
 156 #endif
 157
 158 }  // namespace content