content/browser/compositor/gpu_surfaceless_browser_compositor_output_surface.cc

   1 // Copyright 2014 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/gpu_surfaceless_browser_compositor_output_surface.h"
   6
   7 #include "cc/output/compositor_frame.h"
   8 #include "content/browser/compositor/browser_compositor_overlay_candidate_validator.h"
   9 #include "content/browser/compositor/buffer_queue.h"
  10 #include "content/browser/compositor/reflector_impl.h"
  11 #include "content/browser/gpu/gpu_surface_tracker.h"
  12 #include "content/common/gpu/client/context_provider_command_buffer.h"
  13 #include "content/common/gpu/client/gl_helper.h"
  14 #include "gpu/GLES2/gl2extchromium.h"
  15 #include "gpu/command_buffer/client/gles2_interface.h"
  16
  17 namespace content {
  18
  19 GpuSurfacelessBrowserCompositorOutputSurface::
  20     GpuSurfacelessBrowserCompositorOutputSurface(
  21         const scoped_refptr<ContextProviderCommandBuffer>& context,
  22         int surface_id,
  23         const scoped_refptr<ui::CompositorVSyncManager>& vsync_manager,
  24         scoped_ptr<BrowserCompositorOverlayCandidateValidator>
  25             overlay_candidate_validator,
  26         unsigned internalformat,
  27         BrowserGpuMemoryBufferManager* gpu_memory_buffer_manager)
  28     : GpuBrowserCompositorOutputSurface(context,
  29                                         vsync_manager,
  30                                         overlay_candidate_validator.Pass()),
  31       internalformat_(internalformat),
  32       gpu_memory_buffer_manager_(gpu_memory_buffer_manager) {
  33   capabilities_.uses_default_gl_framebuffer = false;
  34   capabilities_.flipped_output_surface = true;
  35   // Set |max_frames_pending| to 2 for surfaceless, which aligns scheduling
  36   // more closely with the previous surfaced behavior.
  37   // With a surface, swap buffer ack used to return early, before actually
  38   // presenting the back buffer, enabling the browser compositor to run ahead.
  39   // Surfaceless implementation acks at the time of actual buffer swap, which
  40   // shifts the start of the new frame forward relative to the old
  41   // implementation.
  42   capabilities_.max_frames_pending = 2;
  43
  44   gl_helper_.reset(new GLHelper(context_provider_->ContextGL(),
  45                                 context_provider_->ContextSupport()));
  46   output_surface_.reset(
  47       new BufferQueue(context_provider_, internalformat_, gl_helper_.get(),
  48                       gpu_memory_buffer_manager_, surface_id));
  49   output_surface_->Initialize();
  50 }
  51
  52 GpuSurfacelessBrowserCompositorOutputSurface::
  53     ~GpuSurfacelessBrowserCompositorOutputSurface() {
  54 }
  55
  56 void GpuSurfacelessBrowserCompositorOutputSurface::SwapBuffers(
  57     cc::CompositorFrame* frame) {
  58   DCHECK(output_surface_);
  59
  60   GLuint texture = output_surface_->current_texture_id();
  61   output_surface_->SwapBuffers(frame->gl_frame_data->sub_buffer_rect);
  62   const gfx::Size& size = frame->gl_frame_data->size;
  63   context_provider_->ContextGL()->ScheduleOverlayPlaneCHROMIUM(
  64       0,
  65       GL_OVERLAY_TRANSFORM_NONE_CHROMIUM,
  66       texture,
  67       0,
  68       0,
  69       size.width(),
  70       size.height(),
  71       0,
  72       0,
  73       1.0f,
  74       1.0f);
  75   GpuBrowserCompositorOutputSurface::SwapBuffers(frame);
  76 }
  77
  78 void GpuSurfacelessBrowserCompositorOutputSurface::OnSwapBuffersComplete() {
  79   DCHECK(output_surface_);
  80   output_surface_->PageFlipComplete();
  81   GpuBrowserCompositorOutputSurface::OnSwapBuffersComplete();
  82 }
  83
  84 void GpuSurfacelessBrowserCompositorOutputSurface::BindFramebuffer() {
  85   DCHECK(output_surface_);
  86   output_surface_->BindFramebuffer();
  87 }
  88
  89 void GpuSurfacelessBrowserCompositorOutputSurface::Reshape(
  90     const gfx::Size& size,
  91     float scale_factor) {
  92   GpuBrowserCompositorOutputSurface::Reshape(size, scale_factor);
  93   DCHECK(output_surface_);
  94   output_surface_->Reshape(SurfaceSize(), scale_factor);
  95 }
  96
  97 }  // namespace content