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     // Swap buffers and return the handle for the surface to send to the browser
  45     // process to display.
  46     virtual void SwapBuffers(const gfx::Size& size, float scale_factor) = 0;
  47
  48     // Indicate that the backbuffer will be written to.
  49     virtual void WillWriteToBackbuffer() = 0;
  50
  51     // Indicate that the backbuffer has been discarded and should not be seen
  52     // again.
  53     virtual void DiscardBackbuffer() = 0;
  54
  55     // Called once for every SwapBuffers call when the IPC for the present has
  56     // been processed by the browser. |disable_throttling| is set if the
  57     // browser suspects that GPU back-pressure should be disabled.
  58     virtual void SwapBuffersAckedByBrowser(bool disable_throttling) = 0;
  59   };
  60
  61   ImageTransportSurfaceFBO(GpuChannelManager* manager,
  62                            GpuCommandBufferStub* stub,
  63                            gfx::PluginWindowHandle handle);
  64
  65   // GLSurface implementation
  66   bool Initialize() override;
  67   void Destroy() override;
  68   bool DeferDraws() override;
  69   bool IsOffscreen() override;
  70   bool SwapBuffers() override;
  71   bool PostSubBuffer(int x, int y, int width, int height) override;
  72   bool SupportsPostSubBuffer() override;
  73   gfx::Size GetSize() override;
  74   void* GetHandle() override;
  75   void* GetDisplay() override;
  76   bool OnMakeCurrent(gfx::GLContext* context) override;
  77   void NotifyWasBound() override;
  78   unsigned int GetBackingFrameBufferObject() override;
  79   bool SetBackbufferAllocation(bool allocated) override;
  80   void SetFrontbufferAllocation(bool allocated) override;
  81
  82   // Called when the context may continue to make forward progress after a swap.
  83   void SendSwapBuffers(uint64 surface_handle,
  84                        const gfx::Size pixel_size,
  85                        float scale_factor);
  86   void SetRendererID(int renderer_id);
  87
  88  protected:
  89   // ImageTransportSurface implementation
  90   void OnBufferPresented(
  91       const AcceleratedSurfaceMsg_BufferPresented_Params& params) override;
  92   void OnResize(gfx::Size pixel_size, float scale_factor) override;
  93   void SetLatencyInfo(const std::vector<ui::LatencyInfo>&) override;
  94   void WakeUpGpu() override;
  95
  96   // GpuCommandBufferStub::DestructionObserver implementation.
  97   void OnWillDestroyStub() override;
  98
  99  private:
 100   ~ImageTransportSurfaceFBO() override;
 101
 102   void AdjustBufferAllocation();
 103   void DestroyFramebuffer();
 104   void AllocateOrResizeFramebuffer(
 105       const gfx::Size& pixel_size, float scale_factor);
 106
 107   scoped_ptr<StorageProvider> storage_provider_;
 108
 109   // Tracks the current buffer allocation state.
 110   bool backbuffer_suggested_allocation_;
 111   bool frontbuffer_suggested_allocation_;
 112
 113   uint32 fbo_id_;
 114   GLuint texture_id_;
 115   GLuint depth_stencil_renderbuffer_id_;
 116   bool has_complete_framebuffer_;
 117
 118   // Weak pointer to the context that this was last made current to.
 119   gfx::GLContext* context_;
 120
 121   gfx::Size pixel_size_;
 122   gfx::Size rounded_pixel_size_;
 123   float scale_factor_;
 124
 125   // Whether or not we've successfully made the surface current once.
 126   bool made_current_;
 127
 128   // Whether a SwapBuffers IPC needs to be sent to the browser.
 129   bool is_swap_buffers_send_pending_;
 130   std::vector<ui::LatencyInfo> latency_info_;
 131
 132   scoped_ptr<ImageTransportHelper> helper_;
 133
 134   DISALLOW_COPY_AND_ASSIGN(ImageTransportSurfaceFBO);
 135 };
 136
 137 }  // namespace content
 138
 139 #endif  // CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_FBO_MAC_H_