content/common/gpu/image_transport_surface_fbo_mac.h

   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 #ifndef CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_FBO_MAC_H_
   6 #define CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_FBO_MAC_H_
   7
   8 #include "base/mac/scoped_cftyperef.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "content/common/gpu/gpu_command_buffer_stub.h"
  11 #include "content/common/gpu/image_transport_surface.h"
  12 #include "ui/gl/gl_bindings.h"
  13
  14 namespace content {
  15
  16 // We are backed by an offscreen surface for the purposes of creating
  17 // a context, but use FBOs to render to texture. The texture may be backed by
  18 // an IOSurface, or it may be presented to the screen via a CALayer, depending
  19 // on the StorageProvider class specified.
  20 class ImageTransportSurfaceFBO
  21     : public gfx::GLSurface,
  22       public ImageTransportSurface,
  23       public GpuCommandBufferStub::DestructionObserver {
  24  public:
  25   // The interface through which storage for the color buffer of the FBO is
  26   // allocated.
  27   class StorageProvider {
  28    public:
  29     virtual ~StorageProvider() {}
  30     // IOSurfaces cause too much address space fragmentation if they are
  31     // allocated on every resize. This gets a rounded size for allocation.
  32     virtual gfx::Size GetRoundedSize(gfx::Size size) = 0;
  33
  34     // Allocate the storage for the color buffer. The specified context is
  35     // current, and there is a texture bound to GL_TEXTURE_RECTANGLE_ARB.
  36     virtual bool AllocateColorBufferStorage(
  37         CGLContextObj context, const base::Closure& context_dirtied_callback,
  38         GLuint texture, gfx::Size size, float scale_factor) = 0;
  39
  40     // Free the storage allocated in the AllocateColorBufferStorage call. The
  41     // GL texture that was bound has already been deleted by the caller.
  42     virtual void FreeColorBufferStorage() = 0;
  43
  44     // Called when the frame size has changed (the buffer may not have been
  45     // reallocated, since its size may be rounded).
  46     virtual void FrameSizeChanged(
  47         const gfx::Size& pixel_size, float scale_factor) = 0;
  48
  49     // Swap buffers, or post sub-buffer.
  50     virtual void SwapBuffers() = 0;
  51
  52     // Indicate that the backbuffer will be written to.
  53     virtual void WillWriteToBackbuffer() = 0;
  54
  55     // Indicate that the backbuffer has been discarded and should not be seen
  56     // again.
  57     virtual void DiscardBackbuffer() = 0;
  58
  59     // Called once for every SwapBuffers call when the IPC for the present has
  60     // been processed by the browser. |disable_throttling| is set if the
  61     // browser suspects that GPU back-pressure should be disabled.
  62     virtual void SwapBuffersAckedByBrowser(bool disable_throttling) = 0;
  63   };
  64
  65   ImageTransportSurfaceFBO(GpuChannelManager* manager,
  66                            GpuCommandBufferStub* stub,
  67                            gfx::PluginWindowHandle handle);
  68
  69   // GLSurface implementation
  70   bool Initialize() override;
  71   void Destroy() override;
  72   bool DeferDraws() override;
  73   bool IsOffscreen() override;
  74   bool SwapBuffers() override;
  75   bool PostSubBuffer(int x, int y, int width, int height) override;
  76   bool SupportsPostSubBuffer() override;
  77   gfx::Size GetSize() override;
  78   void* GetHandle() override;
  79   void* GetDisplay() override;
  80   bool OnMakeCurrent(gfx::GLContext* context) override;
  81   void NotifyWasBound() override;
  82   unsigned int GetBackingFrameBufferObject() override;
  83   bool SetBackbufferAllocation(bool allocated) override;
  84   void SetFrontbufferAllocation(bool allocated) override;
  85
  86   // Called when the context may continue to make forward progress after a swap.
  87   void SendSwapBuffers(uint64 surface_handle,
  88                        const gfx::Size pixel_size,
  89                        float scale_factor);
  90   void SetRendererID(int renderer_id);
  91
  92  protected:
  93   // ImageTransportSurface implementation
  94   void OnBufferPresented(
  95       const AcceleratedSurfaceMsg_BufferPresented_Params& params) override;
  96   void OnResize(gfx::Size pixel_size, float scale_factor) override;
  97   void SetLatencyInfo(const std::vector<ui::LatencyInfo>&) override;
  98   void WakeUpGpu() override;
  99
 100   // GpuCommandBufferStub::DestructionObserver implementation.
 101   void OnWillDestroyStub() override;
 102
 103  private:
 104   ~ImageTransportSurfaceFBO() override;
 105
 106   void AdjustBufferAllocation();
 107   void DestroyFramebuffer();
 108   void AllocateOrResizeFramebuffer(
 109       const gfx::Size& pixel_size, float scale_factor);
 110   bool SwapBuffersInternal();
 111
 112   scoped_ptr<StorageProvider> storage_provider_;
 113
 114   // Tracks the current buffer allocation state.
 115   bool backbuffer_suggested_allocation_;
 116   bool frontbuffer_suggested_allocation_;
 117
 118   uint32 fbo_id_;
 119   GLuint texture_id_;
 120   GLuint depth_stencil_renderbuffer_id_;
 121   bool has_complete_framebuffer_;
 122
 123   // Weak pointer to the context that this was last made current to.
 124   gfx::GLContext* context_;
 125
 126   gfx::Size pixel_size_;
 127   gfx::Size rounded_pixel_size_;
 128   float scale_factor_;
 129
 130   // Whether or not we've successfully made the surface current once.
 131   bool made_current_;
 132
 133   // Whether a SwapBuffers IPC needs to be sent to the browser.
 134   bool is_swap_buffers_send_pending_;
 135   std::vector<ui::LatencyInfo> latency_info_;
 136
 137   scoped_ptr<ImageTransportHelper> helper_;
 138
 139   DISALLOW_COPY_AND_ASSIGN(ImageTransportSurfaceFBO);
 140 };
 141
 142 }  // namespace content
 143
 144 #endif  // CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_FBO_MAC_H_