1 /*
2  * Copyright (C) 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 #include "Extensions.h"
18 
19 #include "Debug.h"
20 #include "Properties.h"
21 #include "utils/StringUtils.h"
22 
23 #include <GLES2/gl2.h>
24 #include <GLES2/gl2ext.h>
25 #include <utils/Log.h>
26 
27 namespace android {
28 namespace uirenderer {
29 
30 // Debug
31 #if DEBUG_EXTENSIONS
32     #define EXT_LOGD(...) ALOGD(__VA_ARGS__)
33 #else
34     #define EXT_LOGD(...)
35 #endif
36 
37 
Extensions()38 Extensions::Extensions() {
39     auto extensions = StringUtils::split((const char*) glGetString(GL_EXTENSIONS));
40     mHasNPot = extensions.has("GL_OES_texture_npot");
41     mHasFramebufferFetch = extensions.has("GL_NV_shader_framebuffer_fetch");
42     mHasDiscardFramebuffer = extensions.has("GL_EXT_discard_framebuffer");
43     mHasDebugMarker = extensions.has("GL_EXT_debug_marker");
44     mHas1BitStencil = extensions.has("GL_OES_stencil1");
45     mHas4BitStencil = extensions.has("GL_OES_stencil4");
46     mHasUnpackSubImage = extensions.has("GL_EXT_unpack_subimage");
47 
48     const char* version = (const char*) glGetString(GL_VERSION);
49 
50     // Section 6.1.5 of the OpenGL ES specification indicates the GL version
51     // string strictly follows this format:
52     //
53     // OpenGL<space>ES<space><version number><space><vendor-specific information>
54     //
55     // In addition section 6.1.5 describes the version number thusly:
56     //
57     // "The version number is either of the form major number.minor number or
58     // major number.minor number.release number, where the numbers all have one
59     // or more digits. The release number and vendor specific information are
60     // optional."
61 
62     if (sscanf(version, "OpenGL ES %d.%d", &mVersionMajor, &mVersionMinor) != 2) {
63         // If we cannot parse the version number, assume OpenGL ES 2.0
64         mVersionMajor = 2;
65         mVersionMinor = 0;
66     }
67 }
68 
69 }; // namespace uirenderer
70 }; // namespace android
71