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// Copyright 2014 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 "ui/gl/gl_fence_egl.h"
#include "base/memory/ptr_util.h"
#include "ui/gl/egl_util.h"
#include "ui/gl/gl_bindings.h"
namespace gl {
namespace {
bool g_check_egl_fence_before_wait = false;
} // namespace
GLFenceEGL::GLFenceEGL() = default;
// static
std::unique_ptr<GLFenceEGL> GLFenceEGL::Create() {
auto fence = Create(EGL_SYNC_FENCE_KHR, nullptr);
// Default creation isn't supposed to fail.
DCHECK(fence);
return fence;
}
// static
std::unique_ptr<GLFenceEGL> GLFenceEGL::Create(EGLenum type, EGLint* attribs) {
// Can't use MakeUnique, the no-args constructor is private.
auto fence = base::WrapUnique(new GLFenceEGL());
if (!fence->InitializeInternal(type, attribs))
return nullptr;
return fence;
}
// static
void GLFenceEGL::CheckEGLFenceBeforeWait() {
g_check_egl_fence_before_wait = true;
}
bool GLFenceEGL::InitializeInternal(EGLenum type, EGLint* attribs) {
sync_ = EGL_NO_SYNC_KHR;
display_ = eglGetCurrentDisplay();
if (display_ != EGL_NO_DISPLAY) {
sync_ = eglCreateSyncKHR(display_, type, attribs);
glFlush();
}
return sync_ != EGL_NO_SYNC_KHR;
}
bool GLFenceEGL::HasCompleted() {
EGLint value = 0;
if (eglGetSyncAttribKHR(display_, sync_, EGL_SYNC_STATUS_KHR, &value) !=
EGL_TRUE) {
LOG(ERROR) << "Failed to get EGLSync attribute. error code:"
<< eglGetError();
return true;
}
DCHECK(value == EGL_SIGNALED_KHR || value == EGL_UNSIGNALED_KHR);
return !value || value == EGL_SIGNALED_KHR;
}
void GLFenceEGL::ClientWait() {
EGLint result = ClientWaitWithTimeoutNanos(EGL_FOREVER_KHR);
DCHECK_NE(EGL_TIMEOUT_EXPIRED_KHR, result);
}
EGLint GLFenceEGL::ClientWaitWithTimeoutNanos(EGLTimeKHR timeout) {
EGLint flags = 0;
EGLint result = eglClientWaitSyncKHR(display_, sync_, flags, timeout);
if (result == EGL_FALSE) {
LOG(ERROR) << "Failed to wait for EGLSync. error:"
<< ui::GetLastEGLErrorString();
CHECK(false);
}
return result;
}
void GLFenceEGL::ServerWait() {
if (!g_driver_egl.ext.b_EGL_KHR_wait_sync) {
ClientWait();
return;
}
EGLint flags = 0;
bool completed = false;
if (g_check_egl_fence_before_wait) {
// The i965 driver ends up doing a bunch of flushing if an already
// signalled fence is waited on. This causes performance to suffer.
// Check whether the fence is signalled before waiting.
completed = HasCompleted();
}
if (!completed && eglWaitSyncKHR(display_, sync_, flags) == EGL_FALSE) {
LOG(ERROR) << "Failed to wait for EGLSync. error:"
<< ui::GetLastEGLErrorString();
CHECK(false);
}
}
void GLFenceEGL::Invalidate() {
// Do nothing. We want the destructor to destroy the EGL fence even if the GL
// context was lost. The EGLDisplay may still be valid, and this helps avoid
// leaks.
}
GLFenceEGL::~GLFenceEGL() {
eglDestroySyncKHR(display_, sync_);
}
} // namespace gl
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