Extensions.cpp revision 096895550b9d5430d7a001d491566decf4f9791b 
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
27namespace android {
28namespace 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
38Extensions::Extensions() {
39    StringCollection extensions((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