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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"
class GrContext;
namespace WebKit { class WebGraphicsContext3D; }
namespace gpu { class ContextSupport; }
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 WebKit::WebGraphicsContext3D* Context3d() = 0;
virtual gpu::ContextSupport* ContextSupport() = 0;
virtual class GrContext* GrContext() = 0;
struct Capabilities {
bool bind_uniform_location;
bool discard_backbuffer;
bool egl_image_external;
bool fast_npot_mo8_textures;
bool iosurface;
bool map_image;
bool map_sub;
bool post_sub_buffer;
bool set_visibility;
bool shallow_flush;
bool swapbuffers_complete_callback;
bool texture_format_bgra8888;
bool texture_format_etc1;
bool texture_rectangle;
bool texture_storage;
bool texture_usage;
bool discard_framebuffer;
size_t max_transfer_buffer_usage_bytes;
CC_EXPORT Capabilities();
};
// 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;
// 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// the context inside the provider is no longer valid.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 swap buffers completes. This should be
// called from the same thread that the context is bound to.
typedef base::Closure SwapBuffersCompleteCallback;
virtual void SetSwapBuffersCompleteCallback(
const SwapBuffersCompleteCallback& swap_buffers_complete_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 cc::ManagedMemoryPolicy& policy,
bool discard_backbuffer_when_not_visible)> 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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