| // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef CC_OUTPUT_CONTEXT_PROVIDER_H_ |
| #define CC_OUTPUT_CONTEXT_PROVIDER_H_ |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| #include "base/callback.h" |
| #include "base/memory/ref_counted.h" |
| #include "base/synchronization/lock.h" |
| #include "cc/base/cc_export.h" |
| #include "gpu/command_buffer/common/capabilities.h" |
| |
| class GrContext; |
| |
| namespace base { |
| class Lock; |
| } |
| |
| namespace gpu { |
| class ContextSupport; |
| namespace gles2 { class GLES2Interface; } |
| } |
| |
| namespace cc { |
| struct ManagedMemoryPolicy; |
| |
| class ContextProvider : public base::RefCountedThreadSafe<ContextProvider> { |
| public: |
| // Hold an instance of this lock while using a context across multiple |
| // threads. This only works for ContextProviders that will return a valid |
| // lock from GetLock(), so is not always supported. Most use of |
| // ContextProvider should be single-thread only on the thread that |
| // BindToCurrentThread is run on. |
| class ScopedContextLock { |
| public: |
| explicit ScopedContextLock(ContextProvider* context_provider) |
| : context_provider_(context_provider), |
| context_lock_(*context_provider_->GetLock()) { |
| // Allow current thread to use |context_provider_|. |
| context_provider_->DetachFromThread(); |
| } |
| ~ScopedContextLock() { |
| // Allow usage by thread for which |context_provider_| is bound to. |
| context_provider_->DetachFromThread(); |
| } |
| |
| gpu::gles2::GLES2Interface* ContextGL() { |
| return context_provider_->ContextGL(); |
| } |
| |
| private: |
| ContextProvider* const context_provider_; |
| base::AutoLock context_lock_; |
| }; |
| |
| // Bind the 3d context to the current thread. This should be called before |
| // accessing the contexts. Calling it more than once should have no effect. |
| // Once this function has been called, the class should only be accessed |
| // from the same thread unless the function has some explicitly specified |
| // rules for access on a different thread. See SetupLockOnMainThread(), which |
| // can be used to provide access from multiple threads. |
| virtual bool BindToCurrentThread() = 0; |
| |
| virtual gpu::gles2::GLES2Interface* ContextGL() = 0; |
| virtual gpu::ContextSupport* ContextSupport() = 0; |
| virtual class GrContext* GrContext() = 0; |
| |
| // Invalidates the cached OpenGL state in GrContext. |
| // See skia GrContext::resetContext for details. |
| virtual void InvalidateGrContext(uint32_t state) = 0; |
| |
| // Returns the capabilities of the currently bound 3d context. |
| virtual gpu::Capabilities ContextCapabilities() = 0; |
| |
| // Delete all cached gpu resources. |
| virtual void DeleteCachedResources() = 0; |
| |
| // Sets a callback to be called when the context is lost. This should be |
| // called from the same thread that the context is bound to. To avoid races, |
| // it should be called before BindToCurrentThread(). |
| typedef base::Closure LostContextCallback; |
| virtual void SetLostContextCallback( |
| const LostContextCallback& lost_context_callback) = 0; |
| |
| // Below are helper methods for ScopedContextLock. Use that instead of calling |
| // these directly. |
| // |
| // Detaches debugging thread checkers to allow use of the provider from the |
| // current thread. This can be called on any thread. |
| virtual void DetachFromThread() {} |
| // Returns the lock that should be held if using this context from multiple |
| // threads. This can be called on any thread. |
| virtual base::Lock* GetLock() = 0; |
| |
| protected: |
| friend class base::RefCountedThreadSafe<ContextProvider>; |
| virtual ~ContextProvider() {} |
| }; |
| |
| } // namespace cc |
| |
| #endif // CC_OUTPUT_CONTEXT_PROVIDER_H_ |