95 lines
3.0 KiB
C++
95 lines
3.0 KiB
C++
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/*
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** Copyright 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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#define LOG_TAG "GLConsumer"
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#define GL_GLEXT_PROTOTYPES
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#define EGL_EGLEXT_PROTOTYPES
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#include <EGL/egl.h>
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#include <EGL/eglext.h>
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#include <utils/Log.h>
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#include <utils/Singleton.h>
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#include <utils/String8.h>
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#include <private/gui/SyncFeatures.h>
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EGLAPI const char* eglQueryStringImplementationANDROID(EGLDisplay dpy, EGLint name);
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namespace android {
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ANDROID_SINGLETON_STATIC_INSTANCE(SyncFeatures);
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SyncFeatures::SyncFeatures() : Singleton<SyncFeatures>(),
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mHasNativeFenceSync(false),
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mHasFenceSync(false),
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mHasWaitSync(false) {
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EGLDisplay dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
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// This can only be called after EGL has been initialized; otherwise the
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// check below will abort.
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const char* exts = eglQueryStringImplementationANDROID(dpy, EGL_EXTENSIONS);
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LOG_ALWAYS_FATAL_IF(exts == NULL, "eglQueryStringImplementationANDROID failed");
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if (strstr(exts, "EGL_ANDROID_native_fence_sync")) {
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// This makes GLConsumer use the EGL_ANDROID_native_fence_sync
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// extension to create Android native fences to signal when all
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// GLES reads for a given buffer have completed.
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mHasNativeFenceSync = true;
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}
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if (strstr(exts, "EGL_KHR_fence_sync")) {
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mHasFenceSync = true;
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}
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if (strstr(exts, "EGL_KHR_wait_sync")) {
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mHasWaitSync = true;
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}
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mString.append("[using:");
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if (useNativeFenceSync()) {
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mString.append(" EGL_ANDROID_native_fence_sync");
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}
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if (useFenceSync()) {
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mString.append(" EGL_KHR_fence_sync");
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}
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if (useWaitSync()) {
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mString.append(" EGL_KHR_wait_sync");
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}
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mString.append("]");
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}
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bool SyncFeatures::useNativeFenceSync() const {
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// EGL_ANDROID_native_fence_sync is not compatible with using the
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// EGL_KHR_fence_sync extension for the same purpose.
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return mHasNativeFenceSync;
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}
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bool SyncFeatures::useFenceSync() const {
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#ifdef DONT_USE_FENCE_SYNC
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// on some devices it's better to not use EGL_KHR_fence_sync
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// even if they have it
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return false;
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#endif
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// currently we shall only attempt to use EGL_KHR_fence_sync if
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// USE_FENCE_SYNC is set in our makefile
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return !mHasNativeFenceSync && mHasFenceSync;
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}
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bool SyncFeatures::useWaitSync() const {
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return (useNativeFenceSync() || useFenceSync()) && mHasWaitSync;
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}
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String8 SyncFeatures::toString() const {
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return mString;
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}
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} // namespace android
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