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/*
** Copyright 2013, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#define LOG_TAG "GLConsumer"
#define EGL_EGLEXT_PROTOTYPES
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <utils/Log.h>
#include <utils/Singleton.h>
#include <utils/String8.h>
#include <private/gui/SyncFeatures.h>
EGLAPI const char* eglQueryStringImplementationANDROID(EGLDisplay dpy, EGLint name);
namespace android {
ANDROID_SINGLETON_STATIC_INSTANCE(SyncFeatures);
SyncFeatures::SyncFeatures() : Singleton<SyncFeatures>(),
mHasNativeFenceSync(false),
mHasFenceSync(false),
mHasWaitSync(false) {
EGLDisplay dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
// This can only be called after EGL has been initialized; otherwise the
// check below will abort.
const char* exts = eglQueryStringImplementationANDROID(dpy, EGL_EXTENSIONS);
LOG_ALWAYS_FATAL_IF(exts == NULL, "eglQueryStringImplementationANDROID failed");
if (strstr(exts, "EGL_ANDROID_native_fence_sync")) {
// This makes GLConsumer use the EGL_ANDROID_native_fence_sync
// extension to create Android native fences to signal when all
// GLES reads for a given buffer have completed.
mHasNativeFenceSync = true;
}
if (strstr(exts, "EGL_KHR_fence_sync")) {
mHasFenceSync = true;
}
if (strstr(exts, "EGL_KHR_wait_sync")) {
mHasWaitSync = true;
}
mString.append("[using:");
if (useNativeFenceSync()) {
mString.append(" EGL_ANDROID_native_fence_sync");
}
if (useFenceSync()) {
mString.append(" EGL_KHR_fence_sync");
}
if (useWaitSync()) {
mString.append(" EGL_KHR_wait_sync");
}
mString.append("]");
}
bool SyncFeatures::useNativeFenceSync() const {
// EGL_ANDROID_native_fence_sync is not compatible with using the
// EGL_KHR_fence_sync extension for the same purpose.
return mHasNativeFenceSync;
}
bool SyncFeatures::useFenceSync() const {
#ifdef DONT_USE_FENCE_SYNC
// on some devices it's better to not use EGL_KHR_fence_sync
// even if they have it
return false;
#else
// currently we shall only attempt to use EGL_KHR_fence_sync if
// USE_FENCE_SYNC is set in our makefile
return !mHasNativeFenceSync && mHasFenceSync;
#endif
}
bool SyncFeatures::useWaitSync() const {
return (useNativeFenceSync() || useFenceSync()) && mHasWaitSync;
}
String8 SyncFeatures::toString() const {
return mString;
}
} // namespace android
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