1 /*
2 ** Copyright 2013, The Android Open Source Project
3 **
4 ** Licensed under the Apache License, Version 2.0 (the "License");
5 ** you may not use this file except in compliance with the License.
6 ** You may obtain a copy of the License at
7 **
8 ** http://www.apache.org/licenses/LICENSE-2.0
9 **
10 ** Unless required by applicable law or agreed to in writing, software
11 ** distributed under the License is distributed on an "AS IS" BASIS,
12 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 ** See the License for the specific language governing permissions and
14 ** limitations under the License.
15 */
16
17 #define LOG_TAG "GLConsumer"
18
19 #define EGL_EGLEXT_PROTOTYPES
20
21 #include <EGL/egl.h>
22 #include <EGL/eglext.h>
23
24 #include <utils/Log.h>
25 #include <utils/Singleton.h>
26 #include <utils/String8.h>
27
28 #include <private/gui/SyncFeatures.h>
29
30 namespace android {
31
32 ANDROID_SINGLETON_STATIC_INSTANCE(SyncFeatures);
33
SyncFeatures()34 SyncFeatures::SyncFeatures() : Singleton<SyncFeatures>(),
35 mHasNativeFenceSync(false),
36 mHasFenceSync(false),
37 mHasWaitSync(false) {
38 EGLDisplay dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
39 // eglQueryString can only be called after EGL has been initialized;
40 // otherwise the check below will abort. If RenderEngine is using SkiaVk,
41 // EGL will not have been initialized. There's no problem with initializing
42 // it again here (it is ref counted), and then terminating it later.
43 EGLBoolean initialized = eglInitialize(dpy, nullptr, nullptr);
44 LOG_ALWAYS_FATAL_IF(!initialized, "eglInitialize failed");
45 const char* exts = eglQueryString(dpy, EGL_EXTENSIONS);
46 LOG_ALWAYS_FATAL_IF(exts == nullptr, "eglQueryString failed");
47 if (strstr(exts, "EGL_ANDROID_native_fence_sync")) {
48 // This makes GLConsumer use the EGL_ANDROID_native_fence_sync
49 // extension to create Android native fences to signal when all
50 // GLES reads for a given buffer have completed.
51 mHasNativeFenceSync = true;
52 }
53 if (strstr(exts, "EGL_KHR_fence_sync")) {
54 mHasFenceSync = true;
55 }
56 if (strstr(exts, "EGL_KHR_wait_sync")) {
57 mHasWaitSync = true;
58 }
59 mString.append("[using:");
60 if (useNativeFenceSync()) {
61 mString.append(" EGL_ANDROID_native_fence_sync");
62 }
63 if (useFenceSync()) {
64 mString.append(" EGL_KHR_fence_sync");
65 }
66 if (useWaitSync()) {
67 mString.append(" EGL_KHR_wait_sync");
68 }
69 mString.append("]");
70 // Terminate EGL to match the eglInitialize above
71 eglTerminate(dpy);
72 }
73
useNativeFenceSync() const74 bool SyncFeatures::useNativeFenceSync() const {
75 // EGL_ANDROID_native_fence_sync is not compatible with using the
76 // EGL_KHR_fence_sync extension for the same purpose.
77 return mHasNativeFenceSync;
78 }
useFenceSync() const79 bool SyncFeatures::useFenceSync() const {
80 return !mHasNativeFenceSync && mHasFenceSync;
81 }
useWaitSync() const82 bool SyncFeatures::useWaitSync() const {
83 return (useNativeFenceSync() || useFenceSync()) && mHasWaitSync;
84 }
85
toString() const86 String8 SyncFeatures::toString() const {
87 return mString;
88 }
89
90 } // namespace android
91