Home | History | Annotate | Download | only in gpu 
      1 // Copyright (c) 2012 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 #ifndef CONTENT_RENDERER_GPU_MAILBOX_OUTPUT_SURFACE_H_
      6 #define CONTENT_RENDERER_GPU_MAILBOX_OUTPUT_SURFACE_H_
      7 
      8 #include <queue>
      9 
     10 #include "cc/resources/resource_format.h"
     11 #include "cc/resources/transferable_resource.h"
     12 #include "content/renderer/gpu/compositor_output_surface.h"
     13 #include "ui/gfx/size.h"
     14 
     15 namespace cc {
     16 class CompositorFrameAck;
     17 }
     18 
     19 namespace content {
     20 
     21 // Implementation of CompositorOutputSurface that renders to textures which
     22 // are sent to the browser through the mailbox extension.
     23 // This class can be created only on the main thread, but then becomes pinned
     24 // to a fixed thread when bindToClient is called.
     25 class MailboxOutputSurface : public CompositorOutputSurface {
     26  public:
     27   MailboxOutputSurface(
     28       int32 routing_id,
     29       uint32 output_surface_id,
     30       const scoped_refptr<ContextProviderCommandBuffer>& context_provider,
     31       scoped_ptr<cc::SoftwareOutputDevice> software_device,
     32       cc::ResourceFormat format);
     33   virtual ~MailboxOutputSurface();
     34 
     35   // cc::OutputSurface implementation.
     36   virtual void EnsureBackbuffer() OVERRIDE;
     37   virtual void DiscardBackbuffer() OVERRIDE;
     38   virtual void Reshape(const gfx::Size& size, float scale_factor) OVERRIDE;
     39   virtual void BindFramebuffer() OVERRIDE;
     40   virtual void SwapBuffers(cc::CompositorFrame* frame) OVERRIDE;
     41 
     42  private:
     43   // CompositorOutputSurface overrides.
     44   virtual void OnSwapAck(uint32 output_surface_id,
     45                          const cc::CompositorFrameAck& ack) OVERRIDE;
     46 
     47   size_t GetNumAcksPending();
     48 
     49   struct TransferableFrame {
     50     TransferableFrame() : texture_id(0), sync_point(0) {}
     51 
     52     TransferableFrame(uint32 texture_id,
     53                       const gpu::Mailbox& mailbox,
     54                       const gfx::Size size)
     55         : texture_id(texture_id), mailbox(mailbox), size(size), sync_point(0) {}
     56 
     57     uint32 texture_id;
     58     gpu::Mailbox mailbox;
     59     gfx::Size size;
     60     uint32 sync_point;
     61   };
     62 
     63   TransferableFrame current_backing_;
     64   std::deque<TransferableFrame> pending_textures_;
     65   std::queue<TransferableFrame> returned_textures_;
     66 
     67   uint32 fbo_;
     68   bool is_backbuffer_discarded_;
     69   cc::ResourceFormat format_;
     70 };
     71 
     72 }  // namespace content
     73 
     74 #endif  // CONTENT_RENDERER_GPU_MAILBOX_OUTPUT_SURFACE_H_
     75