cc/output/context_provider.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 CC_OUTPUT_CONTEXT_PROVIDER_H_
   6 #define CC_OUTPUT_CONTEXT_PROVIDER_H_
   7
   8 #include "base/callback.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "cc/base/cc_export.h"
  11 #include "gpu/command_buffer/common/capabilities.h"
  12
  13 class GrContext;
  14
  15 namespace base {
  16 class Lock;
  17 }
  18
  19 namespace gpu {
  20 class ContextSupport;
  21 namespace gles2 { class GLES2Interface; }
  22 }
  23
  24 namespace cc {
  25 struct ManagedMemoryPolicy;
  26
  27 class ContextProvider : public base::RefCountedThreadSafe<ContextProvider> {
  28  public:
  29   // Bind the 3d context to the current thread. This should be called before
  30   // accessing the contexts. Calling it more than once should have no effect.
  31   // Once this function has been called, the class should only be accessed
  32   // from the same thread.
  33   virtual bool BindToCurrentThread() = 0;
  34   virtual void DetachFromThread() {}
  35
  36   virtual gpu::gles2::GLES2Interface* ContextGL() = 0;
  37   virtual gpu::ContextSupport* ContextSupport() = 0;
  38   virtual class GrContext* GrContext() = 0;
  39
  40   struct Capabilities {
  41     gpu::Capabilities gpu;
  42     size_t max_transfer_buffer_usage_bytes;
  43
  44     CC_EXPORT Capabilities();
  45   };
  46
  47   // Sets up a lock so this context can be used from multiple threads.
  48   virtual void SetupLock() = 0;
  49
  50   // Returns the lock that should be held if using this context from multiple
  51   // threads.
  52   virtual base::Lock* GetLock() = 0;
  53
  54   // Returns the capabilities of the currently bound 3d context.
  55   virtual Capabilities ContextCapabilities() = 0;
  56
  57   // Checks if the context is currently known to be lost.
  58   virtual bool IsContextLost() = 0;
  59
  60   // Ask the provider to check if the contexts are valid or lost. If they are,
  61   // this should invalidate the provider so that it can be replaced with a new
  62   // one.
  63   virtual void VerifyContexts() = 0;
  64
  65   // Delete all cached gpu resources.
  66   virtual void DeleteCachedResources() = 0;
  67
  68   // A method to be called from the main thread that should return true if
  69   // the context inside the provider is no longer valid.
  70   virtual bool DestroyedOnMainThread() = 0;
  71
  72   // Sets a callback to be called when the context is lost. This should be
  73   // called from the same thread that the context is bound to. To avoid races,
  74   // it should be called before BindToCurrentThread(), or VerifyContexts()
  75   // should be called after setting the callback.
  76   typedef base::Closure LostContextCallback;
  77   virtual void SetLostContextCallback(
  78       const LostContextCallback& lost_context_callback) = 0;
  79
  80   // Sets a callback to be called when the memory policy changes. This should be
  81   // called from the same thread that the context is bound to.
  82   typedef base::Callback<void(const ManagedMemoryPolicy& policy)>
  83       MemoryPolicyChangedCallback;
  84   virtual void SetMemoryPolicyChangedCallback(
  85       const MemoryPolicyChangedCallback& memory_policy_changed_callback) = 0;
  86
  87  protected:
  88   friend class base::RefCountedThreadSafe<ContextProvider>;
  89   virtual ~ContextProvider() {}
  90 };
  91
  92 }  // namespace cc
  93
  94 #endif  // CC_OUTPUT_CONTEXT_PROVIDER_H_