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// 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 "base/callback.h"
#include "base/memory/ref_counted.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:
// 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.
virtual bool BindToCurrentThread() = 0;
virtual void DetachFromThread() {}
virtual gpu::gles2::GLES2Interface* ContextGL() = 0;
virtual gpu::ContextSupport* ContextSupport() = 0;
virtual class GrContext* GrContext() = 0;
struct Capabilities {
gpu::Capabilities gpu;
size_t max_transfer_buffer_usage_bytes;
CC_EXPORT Capabilities();
};
// Invalidates the cached OpenGL state in GrContext.
// See skia GrContext::resetContext for details.
virtual void InvalidateGrContext(uint32_t state) = 0;
// Sets up a lock so this context can be used from multiple threads.
virtual void SetupLock() = 0;
// Returns the lock that should be held if using this context from multiple
// threads.
virtual base::Lock* GetLock() = 0;
// Returns the capabilities of the currently bound 3d context.
virtual Capabilities ContextCapabilities() = 0;
// Ask the provider to check if the contexts are valid or lost. If they are,
// this should invalidate the provider so that it can be replaced with a new
// one.
virtual void VerifyContexts() = 0;
// Delete all cached gpu resources.
virtual void DeleteCachedResources() = 0;
// A method to be called from the main thread that should return true if
// the context inside the provider is no longer valid.
virtual bool DestroyedOnMainThread() = 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(), or VerifyContexts()
// should be called after setting the callback.
typedef base::Closure LostContextCallback;
virtual void SetLostContextCallback(
const LostContextCallback& lost_context_callback) = 0;
// Sets a callback to be called when the memory policy changes. This should be
// called from the same thread that the context is bound to.
typedef base::Callback<void(const ManagedMemoryPolicy& policy)>
MemoryPolicyChangedCallback;
virtual void SetMemoryPolicyChangedCallback(
const MemoryPolicyChangedCallback& memory_policy_changed_callback) = 0;
protected:
friend class base::RefCountedThreadSafe<ContextProvider>;
virtual ~ContextProvider() {}
};
} // namespace cc
#endif // CC_OUTPUT_CONTEXT_PROVIDER_H_
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