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 extern "C" EGLAPI const char* eglQueryStringImplementationANDROID(EGLDisplay dpy, EGLint name);
31
32 namespace android {
33
34 ANDROID_SINGLETON_STATIC_INSTANCE(SyncFeatures);
35
SyncFeatures()36 SyncFeatures::SyncFeatures() : Singleton<SyncFeatures>(),
37 mHasNativeFenceSync(false),
38 mHasFenceSync(false),
39 mHasWaitSync(false) {
40 EGLDisplay dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
41 // This can only be called after EGL has been initialized; otherwise the
42 // check below will abort.
43 const char* exts = eglQueryStringImplementationANDROID(dpy, EGL_EXTENSIONS);
44 LOG_ALWAYS_FATAL_IF(exts == nullptr, "eglQueryStringImplementationANDROID failed");
45 if (strstr(exts, "EGL_ANDROID_native_fence_sync")) {
46 // This makes GLConsumer use the EGL_ANDROID_native_fence_sync
47 // extension to create Android native fences to signal when all
48 // GLES reads for a given buffer have completed.
49 mHasNativeFenceSync = true;
50 }
51 if (strstr(exts, "EGL_KHR_fence_sync")) {
52 mHasFenceSync = true;
53 }
54 if (strstr(exts, "EGL_KHR_wait_sync")) {
55 mHasWaitSync = true;
56 }
57 mString.append("[using:");
58 if (useNativeFenceSync()) {
59 mString.append(" EGL_ANDROID_native_fence_sync");
60 }
61 if (useFenceSync()) {
62 mString.append(" EGL_KHR_fence_sync");
63 }
64 if (useWaitSync()) {
65 mString.append(" EGL_KHR_wait_sync");
66 }
67 mString.append("]");
68 }
69
useNativeFenceSync() const70 bool SyncFeatures::useNativeFenceSync() const {
71 // EGL_ANDROID_native_fence_sync is not compatible with using the
72 // EGL_KHR_fence_sync extension for the same purpose.
73 return mHasNativeFenceSync;
74 }
useFenceSync() const75 bool SyncFeatures::useFenceSync() const {
76 #ifdef DONT_USE_FENCE_SYNC
77 // on some devices it's better to not use EGL_KHR_fence_sync
78 // even if they have it
79 return false;
80 #else
81 // currently we shall only attempt to use EGL_KHR_fence_sync if
82 // USE_FENCE_SYNC is set in our makefile
83 return !mHasNativeFenceSync && mHasFenceSync;
84 #endif
85 }
useWaitSync() const86 bool SyncFeatures::useWaitSync() const {
87 return (useNativeFenceSync() || useFenceSync()) && mHasWaitSync;
88 }
89
toString() const90 String8 SyncFeatures::toString() const {
91 return mString;
92 }
93
94 } // namespace android
95