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 GL_GLEXT_PROTOTYPES
20 #define EGL_EGLEXT_PROTOTYPES
21
22 #include <EGL/egl.h>
23 #include <EGL/eglext.h>
24
25 #include <utils/Log.h>
26 #include <utils/Singleton.h>
27 #include <utils/String8.h>
28
29 #include <private/gui/SyncFeatures.h>
30
31 EGLAPI const char* eglQueryStringImplementationANDROID(EGLDisplay dpy, EGLint name);
32
33 namespace android {
34
35 ANDROID_SINGLETON_STATIC_INSTANCE(SyncFeatures);
36
SyncFeatures()37 SyncFeatures::SyncFeatures() : Singleton<SyncFeatures>(),
38 mHasNativeFenceSync(false),
39 mHasFenceSync(false),
40 mHasWaitSync(false) {
41 EGLDisplay dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
42 // This can only be called after EGL has been initialized; otherwise the
43 // check below will abort.
44 const char* exts = eglQueryStringImplementationANDROID(dpy, EGL_EXTENSIONS);
45 LOG_ALWAYS_FATAL_IF(exts == NULL, "eglQueryStringImplementationANDROID failed");
46 if (strstr(exts, "EGL_ANDROID_native_fence_sync")) {
47 // This makes GLConsumer use the EGL_ANDROID_native_fence_sync
48 // extension to create Android native fences to signal when all
49 // GLES reads for a given buffer have completed.
50 mHasNativeFenceSync = true;
51 }
52 if (strstr(exts, "EGL_KHR_fence_sync")) {
53 mHasFenceSync = true;
54 }
55 if (strstr(exts, "EGL_KHR_wait_sync")) {
56 mHasWaitSync = true;
57 }
58 mString.append("[using:");
59 if (useNativeFenceSync()) {
60 mString.append(" EGL_ANDROID_native_fence_sync");
61 }
62 if (useFenceSync()) {
63 mString.append(" EGL_KHR_fence_sync");
64 }
65 if (useWaitSync()) {
66 mString.append(" EGL_KHR_wait_sync");
67 }
68 mString.append("]");
69 }
70
useNativeFenceSync() const71 bool SyncFeatures::useNativeFenceSync() const {
72 // EGL_ANDROID_native_fence_sync is not compatible with using the
73 // EGL_KHR_fence_sync extension for the same purpose.
74 return mHasNativeFenceSync;
75 }
useFenceSync() const76 bool SyncFeatures::useFenceSync() const {
77 #ifdef DONT_USE_FENCE_SYNC
78 // on some devices it's better to not use EGL_KHR_fence_sync
79 // even if they have it
80 return false;
81 #endif
82 // currently we shall only attempt to use EGL_KHR_fence_sync if
83 // USE_FENCE_SYNC is set in our makefile
84 return !mHasNativeFenceSync && mHasFenceSync;
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