jni/jni_egl_fence.cpp

   1 /*
   2  * Copyright (C) 2012 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 #include "jni_egl_fence.h"
  18
  19 #include <android/log.h>
  20 #include <EGL/egl.h>
  21 #include <EGL/eglext.h>
  22 #include <string.h>
  23
  24 #define  ALOGE(...)  __android_log_print(ANDROID_LOG_ERROR,"egl_fence",__VA_ARGS__)
  25
  26 typedef EGLSyncKHR EGLAPIENTRY (*TypeEglCreateSyncKHR)(EGLDisplay dpy,
  27     EGLenum type, const EGLint *attrib_list);
  28 typedef EGLBoolean EGLAPIENTRY (*TypeEglDestroySyncKHR)(EGLDisplay dpy,
  29     EGLSyncKHR sync);
  30 typedef EGLint EGLAPIENTRY (*TypeEglClientWaitSyncKHR)(EGLDisplay dpy,
  31     EGLSyncKHR sync, EGLint flags, EGLTimeKHR timeout);
  32 static TypeEglCreateSyncKHR FuncEglCreateSyncKHR = NULL;
  33 static TypeEglClientWaitSyncKHR FuncEglClientWaitSyncKHR = NULL;
  34 static TypeEglDestroySyncKHR FuncEglDestroySyncKHR = NULL;
  35 static bool initialized = false;
  36 static bool egl_khr_fence_sync_supported = false;
  37
  38 bool IsEglKHRFenceSyncSupported() {
  39   if (!initialized) {
  40     EGLDisplay display = eglGetCurrentDisplay();
  41     const char* eglExtensions = eglQueryString(eglGetCurrentDisplay(), EGL_EXTENSIONS);
  42     if (eglExtensions && strstr(eglExtensions, "EGL_KHR_fence_sync")) {
  43       FuncEglCreateSyncKHR = (TypeEglCreateSyncKHR) eglGetProcAddress("eglCreateSyncKHR");
  44       FuncEglClientWaitSyncKHR = (TypeEglClientWaitSyncKHR) eglGetProcAddress("eglClientWaitSyncKHR");
  45       FuncEglDestroySyncKHR = (TypeEglDestroySyncKHR) eglGetProcAddress("eglDestroySyncKHR");
  46       if (FuncEglCreateSyncKHR != NULL && FuncEglClientWaitSyncKHR != NULL
  47           && FuncEglDestroySyncKHR != NULL) {
  48         egl_khr_fence_sync_supported = true;
  49       }
  50     }
  51     initialized = true;
  52   }
  53   return egl_khr_fence_sync_supported;
  54 }
  55
  56 void
  57 Java_com_android_gallery3d_photoeditor_FilterStack_nativeEglSetFenceAndWait(JNIEnv* env,
  58                                                                           jobject thiz) {
  59   if (!IsEglKHRFenceSyncSupported()) return;
  60   EGLDisplay display = eglGetCurrentDisplay();
  61
  62   // Create a egl fence and wait for egl to return it.
  63   // Additional reference on egl fence sync can be found in:
  64   // http://www.khronos.org/registry/vg/extensions/KHR/EGL_KHR_fence_sync.txt
  65   EGLSyncKHR fence = FuncEglCreateSyncKHR(display, EGL_SYNC_FENCE_KHR, NULL);
  66   if (fence == EGL_NO_SYNC_KHR) {
  67     return;
  68   }
  69
  70   EGLint result = FuncEglClientWaitSyncKHR(display,
  71                                        fence,
  72                                        EGL_SYNC_FLUSH_COMMANDS_BIT_KHR,
  73                                        EGL_FOREVER_KHR);
  74   if (result == EGL_FALSE) {
  75     ALOGE("EGL FENCE: error waiting for fence: %#x", eglGetError());
  76   }
  77   FuncEglDestroySyncKHR(display, fence);
  78 }