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// Copyright (c) 2012 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_GL_FENCE_H_
#define UI_GL_GL_FENCE_H_
#include "base/macros.h"
#include "ui/gl/gl_export.h"
typedef void *EGLDisplay;
typedef void *EGLSyncKHR;
typedef struct __GLsync *GLsync;
namespace gl {
union TransferableFence {
enum SyncType {
NoSync,
EglSync,
ArbSync
};
SyncType type;
struct {
SyncType type;
EGLDisplay display;
EGLSyncKHR sync;
} egl;
struct {
SyncType type;
GLsync sync;
} arb;
TransferableFence() : type(NoSync) { }
operator bool() { return type != NoSync; }
void reset() { type = NoSync; }
};
class GL_EXPORT GLFence {
public:
GLFence();
virtual ~GLFence();
static bool IsSupported();
static GLFence* Create();
virtual TransferableFence Transfer() = 0;
virtual bool HasCompleted() = 0;
virtual void ClientWait() = 0;
// Will block the server if supported, but might fall back to blocking the
// client.
virtual void ServerWait() = 0;
// Returns true if re-setting state is supported.
virtual bool ResetSupported();
// Resets the fence to the original state.
virtual void ResetState();
// Loses the reference to the fence. Useful if the context is lost.
virtual void Invalidate();
private:
DISALLOW_COPY_AND_ASSIGN(GLFence);
};
} // namespace gl
#endif // UI_GL_GL_FENCE_H_
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