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// Copyright 2016 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.
#include "platform/PlatformExport.h"
#include "wtf/ThreadSpecific.h"
#include <memory>
namespace gpu {
namespace gles2 {
class GLES2Interface;
}
}
class GrContext;
namespace blink {
class WaitableEvent;
class WebGraphicsContext3DProvider;
// SharedGpuContext provides access to a thread-specific GPU context
// that is shared by many callsites throughout the thread.
// When on the main thread, provides access to the same context as
// Platform::createSharedOffscreenGraphicsContext3DProvider
class PLATFORM_EXPORT SharedGpuContext {
public:
// The contextId is incremented each time a new underlying context
// is created. For example, when the context is lost, then restored.
// User code can rely on this Id to determine whether long-lived
// gpu resources are still alive in the current context.
static unsigned contextId();
static gpu::gles2::GLES2Interface*
gl(); // May re-create context if context was lost
static GrContext* gr(); // May re-create context if context was lost
static bool isValid(); // May re-create context if context was lost
static bool isValidWithoutRestoring();
typedef std::function<std::unique_ptr<WebGraphicsContext3DProvider>()>
ContextProviderFactory;
static void setContextProviderFactoryForTesting(ContextProviderFactory);
enum {
kNoSharedContext = 0,
};
private:
static SharedGpuContext* getInstanceForCurrentThread();
SharedGpuContext();
void createContextProviderOnMainThread(WaitableEvent*);
void createContextProviderIfNeeded();
ContextProviderFactory m_contextProviderFactory = nullptr;
std::unique_ptr<WebGraphicsContext3DProvider> m_contextProvider;
unsigned m_contextId;
friend class WTF::ThreadSpecific<SharedGpuContext>;
};
} // blink
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