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      1 // Copyright (c) 2013 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_BROWSER_RENDERER_HOST_COMPOSITING_IOSURFACE_CONTEXT_MAC_H_
      6 #define CONTENT_BROWSER_RENDERER_HOST_COMPOSITING_IOSURFACE_CONTEXT_MAC_H_
      7 
      8 #import <AppKit/NSOpenGL.h>
      9 #include <OpenGL/OpenGL.h>
     10 #include <map>
     11 
     12 #include "base/basictypes.h"
     13 #include "base/lazy_instance.h"
     14 #include "base/mac/scoped_nsobject.h"
     15 #include "base/memory/ref_counted.h"
     16 #include "base/memory/scoped_ptr.h"
     17 #include "content/public/browser/gpu_data_manager_observer.h"
     18 #include "ui/gl/scoped_cgl.h"
     19 
     20 namespace content {
     21 
     22 class CompositingIOSurfaceContext
     23     : public base::RefCounted<CompositingIOSurfaceContext>,
     24       public content::GpuDataManagerObserver {
     25  public:
     26   enum {
     27     // The number used to look up the context used for async readback and for
     28     // initializing the IOSurface.
     29     kOffscreenContextWindowNumber = -2,
     30     // The number used to look up the context used by CAOpenGLLayers.
     31     kCALayerContextWindowNumber = -3,
     32   };
     33 
     34   // Get or create a GL context for the specified window with the specified
     35   // surface ordering. Share these GL contexts as much as possible because
     36   // creating and destroying them can be expensive
     37   // http://crbug.com/180463
     38   static scoped_refptr<CompositingIOSurfaceContext> Get(int window_number);
     39 
     40   // Mark that all the GL contexts in the same sharegroup as this context as
     41   // invalid, so they shouldn't be returned anymore by Get, but rather, new
     42   // contexts should be created. This is called as a precaution when unexpected
     43   // GL errors occur.
     44   void PoisonContextAndSharegroup();
     45   bool HasBeenPoisoned() const { return poisoned_; }
     46 
     47   CGLContextObj cgl_context() const { return cgl_context_; }
     48   int window_number() const { return window_number_; }
     49 
     50   // content::GpuDataManagerObserver implementation.
     51   virtual void OnGpuSwitching() OVERRIDE;
     52 
     53  private:
     54   friend class base::RefCounted<CompositingIOSurfaceContext>;
     55 
     56   CompositingIOSurfaceContext(
     57       int window_number,
     58       base::ScopedTypeRef<CGLContextObj> clg_context_strong,
     59       CGLContextObj clg_context);
     60   virtual ~CompositingIOSurfaceContext();
     61 
     62   int window_number_;
     63   base::ScopedTypeRef<CGLContextObj> cgl_context_strong_;
     64   // Weak, backed by |cgl_context_strong_|.
     65   CGLContextObj cgl_context_;
     66 
     67   bool poisoned_;
     68 
     69   // The global map from window number and window ordering to
     70   // context data.
     71   typedef std::map<int, CompositingIOSurfaceContext*> WindowMap;
     72   static base::LazyInstance<WindowMap> window_map_;
     73   static WindowMap* window_map();
     74 };
     75 
     76 }  // namespace content
     77 
     78 #endif  // CONTENT_BROWSER_RENDERER_HOST_COMPOSITING_IOSURFACE_CONTEXT_MAC_H_
     79