1 /*
2 * Copyright (C) 2016 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 "GLESVersionDetector.h"
18 
19 #include "DispatchTables.h"
20 
21 #include "emugl/common/feature_control.h"
22 
23 #include <algorithm>
24 
calcMaxVersionFromDispatch()25 GLESDispatchMaxVersion calcMaxVersionFromDispatch() {
26     // Detect the proper OpenGL ES version to advertise to the system.
27     //
28     // If the underlying glesv2 library also is on top of system OpenGL,
29     // we assume existence of a function called "gl_dispatch_get_max_version"
30     // which matches the return type of gles2_dispatch_get_max_version,
31     // and allows us to scale back if the underlying host machine
32     // doesn't actually suppport a particular GLES version.
33     if (!emugl_feature_is_enabled(android::featurecontrol::GLESDynamicVersion))
34         return GLES_DISPATCH_MAX_VERSION_2;
35 
36     GLESDispatchMaxVersion underlying_gles2_lib_max =
37         gles2_dispatch_get_max_version();
38     if (s_gles2.gl_dispatch_get_max_version) {
39         GLESDispatchMaxVersion underlying_gl_lib_max =
40             (GLESDispatchMaxVersion)s_gles2.gl_dispatch_get_max_version();
41         return std::min(underlying_gl_lib_max, underlying_gles2_lib_max);
42     } else {
43         return underlying_gles2_lib_max;
44     }
45 
46     return GLES_DISPATCH_MAX_VERSION_2;
47 }
48