gpu: Change Produce/ConsumeTexture to allow texture sharing

content/common/gpu/texture_image_transport_surface.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_COMMON_GPU_TEXTURE_IMAGE_TRANSPORT_SURFACE_H_
 #define CONTENT_COMMON_GPU_TEXTURE_IMAGE_TRANSPORT_SURFACE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/common/gpu/gpu_command_buffer_stub.h"
 #include "content/common/gpu/image_transport_surface.h"
 #include "gpu/command_buffer/service/mailbox_manager.h"
-#include "gpu/command_buffer/service/texture_definition.h"
 #include "gpu/command_buffer/service/texture_manager.h"
 #include "ui/gl/gl_context.h"
 #include "ui/gl/gl_surface.h"
 
 namespace content {
 class GpuChannelManager;
 
 class TextureImageTransportSurface
     : public ImageTransportSurface,
       public GpuCommandBufferStub::DestructionObserver,
       public gfx::GLSurface {
  public:
   TextureImageTransportSurface(GpuChannelManager* manager,
                                GpuCommandBufferStub* stub,
                                const gfx::GLSurfaceHandle& handle);
 
   // gfx::GLSurface implementation.
   virtual bool Initialize() OVERRIDE;
   virtual void Destroy() OVERRIDE;
   virtual bool DeferDraws() OVERRIDE;
-  virtual bool Resize(const gfx::Size& size) OVERRIDE;
   virtual bool IsOffscreen() OVERRIDE;
   virtual bool SwapBuffers() OVERRIDE;
   virtual gfx::Size GetSize() OVERRIDE;
   virtual void* GetHandle() OVERRIDE;
   virtual unsigned GetFormat() OVERRIDE;
   virtual std::string GetExtensions() OVERRIDE;
   virtual unsigned int GetBackingFrameBufferObject() OVERRIDE;
   virtual bool PostSubBuffer(int x, int y, int width, int height) OVERRIDE;
-  virtual bool OnMakeCurrent(gfx::GLContext* context) OVERRIDE;
   virtual bool SetBackbufferAllocation(bool allocated) OVERRIDE;
   virtual void SetFrontbufferAllocation(bool allocated) OVERRIDE;
   virtual void* GetShareHandle() OVERRIDE;
   virtual void* GetDisplay() OVERRIDE;
   virtual void* GetConfig() OVERRIDE;
 
  protected:
   // ImageTransportSurface implementation.
   virtual void OnBufferPresented(
       const AcceleratedSurfaceMsg_BufferPresented_Params& params) OVERRIDE;
   virtual void OnResizeViewACK() OVERRIDE;
   virtual void OnResize(gfx::Size size) OVERRIDE;
   virtual void SetLatencyInfo(
       const cc::LatencyInfo& latency_info) OVERRIDE;
 
   // GpuCommandBufferStub::DestructionObserver implementation.
   virtual void OnWillDestroyStub() OVERRIDE;
 
  private:
 
   gfx::Size backbuffer_size() const {
-    return gfx::Size(backbuffer_->level_infos()[0][0].width,
-                     backbuffer_->level_infos()[0][0].height);
+    DCHECK(backbuffer_);
+    GLsizei width = 0;
+    GLsizei height = 0;
+    backbuffer_->texture()->GetLevelSize(GL_TEXTURE_2D, 0, &width, &height);
+    return gfx::Size(width, height);
   }
 
   virtual ~TextureImageTransportSurface();
   void CreateBackTexture();
   void AttachBackTextureToFBO();
   void ReleaseBackTexture();
+  void ReleaseFrontTexture();
   void BufferPresentedImpl(const std::string& mailbox_name);
-  void ProduceTexture();
-  void ConsumeTexture();
-
-  static gpu::gles2::TextureDefinition* CreateTextureDefinition(gfx::Size size,
-                                                                int service_id);
 
   // The framebuffer that represents this surface (service id). Allocated lazily
   // in OnMakeCurrent.
   uint32 fbo_id_;
 
   // The current backbuffer.
-  scoped_ptr<gpu::gles2::TextureDefinition> backbuffer_;
+  scoped_refptr<gpu::gles2::TextureRef> backbuffer_;
+  scoped_refptr<gpu::gles2::TextureRef> frontbuffer_;
 
   // The mailbox name for the current backbuffer texture. Needs to be unique per
   // GL texture and is invalid while service_id is zero.
-  gpu::gles2::MailboxName mailbox_name_;
+  gpu::gles2::MailboxName back_mailbox_name_;
+  gpu::gles2::MailboxName front_mailbox_name_;
 
   // The current size of the GLSurface. Used to disambiguate from the current
   // texture size which might be outdated (since we use two buffers).
   gfx::Size current_size_;
 
   // Whether or not the command buffer stub has been destroyed.
   bool stub_destroyed_;
 
   bool backbuffer_suggested_allocation_;
   bool frontbuffer_suggested_allocation_;
 
   scoped_ptr<ImageTransportHelper> helper_;
   gfx::GLSurfaceHandle handle_;
 
   // The offscreen surface used to make the context current. However note that
   // the actual rendering is always redirected to an FBO.
   scoped_refptr<gfx::GLSurface> surface_;
 
-  // Holds a reference to the underlying context for cleanup.
-  scoped_refptr<gfx::GLContext> context_;
-
   // Whether a SwapBuffers is pending.
   bool is_swap_buffers_pending_;
 
   // Whether we unscheduled command buffer because of pending SwapBuffers.
   bool did_unschedule_;
 
   // Holds a reference to the mailbox manager for cleanup.
   scoped_refptr<gpu::gles2::MailboxManager> mailbox_manager_;
 
   cc::LatencyInfo latency_info_;
   DISALLOW_COPY_AND_ASSIGN(TextureImageTransportSurface);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_TEXTURE_IMAGE_TRANSPORT_SURFACE_H_