content/browser/renderer_host/compositing_iosurface_context_mac.h

   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_