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  57   // the context inside the provider is no longer valid.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