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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 CompositingIOSurfaceShaderPrograms;
     23 
     24 class CompositingIOSurfaceContext
     25     : public base::RefCounted<CompositingIOSurfaceContext>,
     26       public content::GpuDataManagerObserver {
     27  public:
     28   enum {
     29     // The number used to look up the context used for async readback and for
     30     // initializing the IOSurface.
     31     kOffscreenContextWindowNumber = -2,
     32     // The number used to look up the context used by CAOpenGLLayers.
     33     kCALayerContextWindowNumber = -3,
     34   };
     35 
     36   // Get or create a GL context for the specified window with the specified
     37   // surface ordering. Share these GL contexts as much as possible because
     38   // creating and destroying them can be expensive
     39   // http://crbug.com/180463
     40   static scoped_refptr<CompositingIOSurfaceContext> Get(int window_number);
     41 
     42   // Mark that all the GL contexts in the same sharegroup as this context as
     43   // invalid, so they shouldn't be returned anymore by Get, but rather, new
     44   // contexts should be created. This is called as a precaution when unexpected
     45   // GL errors occur.
     46   void PoisonContextAndSharegroup();
     47   bool HasBeenPoisoned() const { return poisoned_; }
     48 
     49   CompositingIOSurfaceShaderPrograms* shader_program_cache() const {
     50     return shader_program_cache_.get();
     51   }
     52   CGLContextObj cgl_context() const { return cgl_context_; }
     53   bool is_vsync_disabled() const { return is_vsync_disabled_; }
     54   int window_number() const { return window_number_; }
     55 
     56   // content::GpuDataManagerObserver implementation.
     57   virtual void OnGpuSwitching() OVERRIDE;
     58 
     59  private:
     60   friend class base::RefCounted<CompositingIOSurfaceContext>;
     61 
     62   CompositingIOSurfaceContext(
     63       int window_number,
     64       base::ScopedTypeRef<CGLContextObj> clg_context_strong,
     65       CGLContextObj clg_context,
     66       bool is_vsync_disabled_,
     67       scoped_ptr<CompositingIOSurfaceShaderPrograms> shader_program_cache);
     68   virtual ~CompositingIOSurfaceContext();
     69 
     70   int window_number_;
     71   base::ScopedTypeRef<CGLContextObj> cgl_context_strong_;
     72   // Weak, backed by |cgl_context_strong_|.
     73   CGLContextObj cgl_context_;
     74 
     75   bool is_vsync_disabled_;
     76   scoped_ptr<CompositingIOSurfaceShaderPrograms> shader_program_cache_;
     77   bool poisoned_;
     78 
     79   // The global map from window number and window ordering to
     80   // context data.
     81   typedef std::map<int, CompositingIOSurfaceContext*> WindowMap;
     82   static base::LazyInstance<WindowMap> window_map_;
     83   static WindowMap* window_map();
     84 };
     85 
     86 }  // namespace content
     87 
     88 #endif  // CONTENT_BROWSER_RENDERER_HOST_COMPOSITING_IOSURFACE_CONTEXT_MAC_H_
     89