114 lines
2.9 KiB
C++
114 lines
2.9 KiB
C++
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_HWUI_FENCE_H
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#define ANDROID_HWUI_FENCE_H
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#include <EGL/egl.h>
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#include <EGL/eglext.h>
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namespace android {
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namespace uirenderer {
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/**
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* Creating a Fence instance inserts a new sync fence in the OpenGL
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* commands stream. The caller can then wait for the fence to be signaled
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* by calling the wait method.
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*/
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class Fence {
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public:
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enum {
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/**
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* Default timeout in nano-seconds for wait()
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*/
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kDefaultTimeout = 1000000000
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};
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/**
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* Inserts a new sync fence in the OpenGL commands stream.
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*/
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Fence() {
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mDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
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if (mDisplay != EGL_NO_DISPLAY) {
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mFence = eglCreateSyncKHR(mDisplay, EGL_SYNC_FENCE_KHR, NULL);
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} else {
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mFence = EGL_NO_SYNC_KHR;
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}
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}
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/**
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* Destroys the fence. Any caller waiting on the fence will be
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* signaled immediately.
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*/
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~Fence() {
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if (mFence != EGL_NO_SYNC_KHR) {
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eglDestroySyncKHR(mDisplay, mFence);
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}
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}
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/**
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* Blocks the calling thread until this fence is signaled, or until
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* <timeout> nanoseconds have passed.
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*
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* Returns true if waiting for the fence was successful, false if
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* a timeout or an error occurred.
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*/
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bool wait(EGLTimeKHR timeout = kDefaultTimeout) {
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EGLint waitStatus = eglClientWaitSyncKHR(mDisplay, mFence,
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EGL_SYNC_FLUSH_COMMANDS_BIT_KHR, timeout);
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if (waitStatus == EGL_FALSE) {
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ALOGW("Failed to wait for the fence %#x", eglGetError());
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}
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return waitStatus == EGL_CONDITION_SATISFIED_KHR;
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}
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private:
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EGLDisplay mDisplay;
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EGLSyncKHR mFence;
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}; // class Fence
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/**
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* An AutoFence creates a Fence instance and waits for the fence
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* to be signaled when the AutoFence is destroyed. This is useful
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* to automatically wait for a series of OpenGL commands to be
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* executed. For example:
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*
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* void drawAndWait() {
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* glDrawElements();
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* AutoFence fence;
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* }
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*/
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class AutoFence {
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public:
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AutoFence(EGLTimeKHR timeout = Fence::kDefaultTimeout): mTimeout(timeout) {
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}
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~AutoFence() {
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mFence.wait(mTimeout);
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}
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private:
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EGLTimeKHR mTimeout;
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Fence mFence;
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}; // class AutoFence
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}; // namespace uirenderer
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}; // namespace android
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#endif // ANDROID_HWUI_FENCE_H
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