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