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- // Copyright 2020 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 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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