Extensions.cpp revision df1dc28ba0c63b195016ad0453fc58025ee82acb 
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
20namespace android {
21
22using namespace uirenderer;
23ANDROID_SINGLETON_STATIC_INSTANCE(Extensions);
24
25namespace 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
42Extensions::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
90Extensions::~Extensions() {
91   free(mExtensions);
92   free(mVersion);
93}
94
95///////////////////////////////////////////////////////////////////////////////
96// Methods
97///////////////////////////////////////////////////////////////////////////////
98
99bool Extensions::hasExtension(const char* extension) const {
100   const String8 s(extension);
101   return mExtensionList.indexOf(s) >= 0;
102}
103
104void Extensions::dump() const {
105   ALOGD("%s", mVersion);
106   ALOGD("Supported extensions:\n%s", mExtensions);
107}
108
109}; // namespace uirenderer
110}; // namespace android
111