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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_GL_SHARED_GL_FENCE_EGL_H_
#define UI_GL_SHARED_GL_FENCE_EGL_H_
#include "base/memory/raw_ptr.h"
#include "base/memory/ref_counted.h"
#include "base/synchronization/lock.h"
#include "base/thread_annotations.h"
#include "ui/gl/gl_export.h"
namespace gl {
class GLFenceEGL;
class GLApi;
// This class is an optimized way to share an egl fence among multiple
// consumers. Once the shared |egl_fence_| has been waited upon by any of the
// consumer, all the future waits to the same fence becomes no-op since we don't
// need to wait again on the same fence any more. This saves un-neccesary gl
// calls issued to do wait by each consumer.
// This object should only be shared among consumers of the same GL context
// which is true for Webview case.
// TODO(vikassoni): Add logic to handle consumers from different GL context.
class GL_EXPORT SharedGLFenceEGL
: public base::RefCountedThreadSafe<SharedGLFenceEGL> {
public:
SharedGLFenceEGL();
SharedGLFenceEGL(const SharedGLFenceEGL&) = delete;
SharedGLFenceEGL& operator=(const SharedGLFenceEGL&) = delete;
// Issues a ServerWait on the |egl_fence_|.
void ServerWait();
protected:
virtual ~SharedGLFenceEGL();
private:
friend class base::RefCountedThreadSafe<SharedGLFenceEGL>;
std::unique_ptr<GLFenceEGL> egl_fence_ GUARDED_BY(lock_);
// A lock that guard against multiple threads trying to access |egl_fence_|.
base::Lock lock_;
// GLApi on which all the consumers for this object should be on.
raw_ptr<gl::GLApi> gl_api_ = nullptr;
};
} // namespace gl
#endif // UI_GL_SHARED_GL_FENCE_EGL_H_
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