src/type3_AndroidCloud/anbox-master/external/android-emugl/host/libs/libOpenGLESDispatch/EGLDispatch.cpp

   1 /*
   2 * Copyright (C) 2011 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 #include "OpenGLESDispatch/EGLDispatch.h"
  17
  18 #include "emugl/common/shared_library.h"
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22
  23 namespace {
  24 constexpr const char *egl_lib_env_var{"ANBOX_EGL_LIB"};
  25 }
  26
  27 EGLDispatch s_egl;
  28
  29 #define RENDER_EGL_LOAD_FIELD(return_type, function_name, signature) \
  30     s_egl. function_name = (function_name ## _t) lib->findSymbol(#function_name);
  31
  32 #define RENDER_EGL_LOAD_OPTIONAL_FIELD(return_type, function_name, signature) \
  33     if (s_egl.eglGetProcAddress) s_egl. function_name = \
  34             (function_name ## _t) s_egl.eglGetProcAddress(#function_name); \
  35     if (!s_egl.function_name || !s_egl.eglGetProcAddress) \
  36             RENDER_EGL_LOAD_FIELD(return_type, function_name, signature)
  37
  38 bool init_egl_dispatch(const char *path) {
  39     const char *libName = getenv(egl_lib_env_var);
  40     if (!libName)
  41       libName = path;
  42     if (!libName)
  43       return false;
  44
  45     char error[256];
  46     emugl::SharedLibrary *lib = emugl::SharedLibrary::open(libName, error, sizeof(error));
  47     if (!lib) {
  48         printf("Failed to open %s: [%s]\n", libName, error);
  49         return false;
  50     }
  51
  52     LIST_RENDER_EGL_FUNCTIONS(RENDER_EGL_LOAD_FIELD)
  53     LIST_RENDER_EGL_EXTENSIONS_FUNCTIONS(RENDER_EGL_LOAD_OPTIONAL_FIELD)
  54
  55     s_egl.initialized = true;
  56
  57     return true;
  58 }