Extensions.cpp revision 253f2c213f6ecda63b6872aee77bd30d5ec07c82 
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
26#include <utils/Log.h>
27
28namespace android {
29namespace uirenderer {
30
31// Debug
32#if DEBUG_EXTENSIONS
33    #define EXT_LOGD(...) ALOGD(__VA_ARGS__)
34#else
35    #define EXT_LOGD(...)
36#endif
37
38
39Extensions::Extensions() {
40    auto extensions = StringUtils::split((const char*) glGetString(GL_EXTENSIONS));
41    mHasNPot = extensions.has("GL_OES_texture_npot");
42    mHasFramebufferFetch = extensions.has("GL_NV_shader_framebuffer_fetch");
43    mHasDiscardFramebuffer = extensions.has("GL_EXT_discard_framebuffer");
44    mHasDebugMarker = extensions.has("GL_EXT_debug_marker");
45    mHas1BitStencil = extensions.has("GL_OES_stencil1");
46    mHas4BitStencil = extensions.has("GL_OES_stencil4");
47    mHasUnpackSubImage = extensions.has("GL_EXT_unpack_subimage");
48    mHasSRGB = extensions.has("GL_EXT_sRGB");
49    mHasSRGBWriteControl = extensions.has("GL_EXT_sRGB_write_control");
50
51    // If linear blending is enabled, the device must have ES3.0 and GL_EXT_sRGB_write_control
52#ifdef ANDROID_ENABLE_LINEAR_BLENDING
53    assert(mVersionMajor >= 3 || mHasSRGB);
54    assert(mHasSRGBWriteControl);
55#endif
56
57    const char* version = (const char*) glGetString(GL_VERSION);
58
59    // Section 6.1.5 of the OpenGL ES specification indicates the GL version
60    // string strictly follows this format:
61    //
62    // OpenGL<space>ES<space><version number><space><vendor-specific information>
63    //
64    // In addition section 6.1.5 describes the version number thusly:
65    //
66    // "The version number is either of the form major number.minor number or
67    // major number.minor number.release number, where the numbers all have one
68    // or more digits. The release number and vendor specific information are
69    // optional."
70
71    if (sscanf(version, "OpenGL ES %d.%d", &mVersionMajor, &mVersionMinor) != 2) {
72        // If we cannot parse the version number, assume OpenGL ES 2.0
73        mVersionMajor = 2;
74        mVersionMinor = 0;
75    }
76}
77
78}; // namespace uirenderer
79}; // namespace android
80