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 "Debug.h"
18 #include "Extensions.h"
19
20 namespace android {
21
22 using namespace uirenderer;
23 ANDROID_SINGLETON_STATIC_INSTANCE(Extensions);
24
25 namespace uirenderer {
26
27 ///////////////////////////////////////////////////////////////////////////////
28 // Defines
29 ///////////////////////////////////////////////////////////////////////////////
30
31 // Debug
32 #if DEBUG_EXTENSIONS
33 #define EXT_LOGD(...) ALOGD(__VA_ARGS__)
34 #else
35 #define EXT_LOGD(...)
36 #endif
37
38 ///////////////////////////////////////////////////////////////////////////////
39 // Constructors
40 ///////////////////////////////////////////////////////////////////////////////
41
Extensions()42 Extensions::Extensions(): Singleton<Extensions>() {
43 const char* buffer = (const char*) glGetString(GL_EXTENSIONS);
44 const char* current = buffer;
45 const char* head = current;
46 EXT_LOGD("Available GL extensions:");
47 do {
48 head = strchr(current, ' ');
49 String8 s(current, head ? head - current : strlen(current));
50 if (s.length()) {
51 mExtensionList.add(s);
52 EXT_LOGD(" %s", s.string());
53 }
54 current = head + 1;
55 } while (head);
56
57 mHasNPot = hasExtension("GL_OES_texture_npot");
58 mHasFramebufferFetch = hasExtension("GL_NV_shader_framebuffer_fetch");
59 mHasDiscardFramebuffer = hasExtension("GL_EXT_discard_framebuffer");
60 mHasDebugMarker = hasExtension("GL_EXT_debug_marker");
61 mHasDebugLabel = hasExtension("GL_EXT_debug_label");
62 mHasTiledRendering = hasExtension("GL_QCOM_tiled_rendering");
63 mHas1BitStencil = hasExtension("GL_OES_stencil1");
64 mHas4BitStencil = hasExtension("GL_OES_stencil4");
65
66 mExtensions = strdup(buffer);
67
68 const char* version = (const char*) glGetString(GL_VERSION);
69 mVersion = strdup(version);
70
71 // Section 6.1.5 of the OpenGL ES specification indicates the GL version
72 // string strictly follows this format:
73 //
74 // OpenGL<space>ES<space><version number><space><vendor-specific information>
75 //
76 // In addition section 6.1.5 describes the version number thusly:
77 //
78 // "The version number is either of the form major number.minor number or
79 // major number.minor number.release number, where the numbers all have one
80 // or more digits. The release number and vendor specific information are
81 // optional."
82
83 if (sscanf(version, "OpenGL ES %d.%d", &mVersionMajor, &mVersionMinor) !=2) {
84 // If we cannot parse the version number, assume OpenGL ES 2.0
85 mVersionMajor = 2;
86 mVersionMinor = 0;
87 }
88 }
89
~Extensions()90 Extensions::~Extensions() {
91 free(mExtensions);
92 free(mVersion);
93 }
94
95 ///////////////////////////////////////////////////////////////////////////////
96 // Methods
97 ///////////////////////////////////////////////////////////////////////////////
98
hasExtension(const char * extension) const99 bool Extensions::hasExtension(const char* extension) const {
100 const String8 s(extension);
101 return mExtensionList.indexOf(s) >= 0;
102 }
103
dump() const104 void Extensions::dump() const {
105 ALOGD("%s", mVersion);
106 ALOGD("Supported extensions:\n%s", mExtensions);
107 }
108
109 }; // namespace uirenderer
110 }; // namespace android
111