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 <cutils/compiler.h>
24
25#include <GLES2/gl2.h>
26#include <GLES2/gl2ext.h>
27
28#include <utils/Log.h>
29
30namespace android {
31namespace uirenderer {
32
33Extensions::Extensions() {
34    const char* version = (const char*) glGetString(GL_VERSION);
35
36    // Section 6.1.5 of the OpenGL ES specification indicates the GL version
37    // string strictly follows this format:
38    //
39    // OpenGL<space>ES<space><version number><space><vendor-specific information>
40    //
41    // In addition section 6.1.5 describes the version number thusly:
42    //
43    // "The version number is either of the form major number.minor number or
44    // major number.minor number.release number, where the numbers all have one
45    // or more digits. The release number and vendor specific information are
46    // optional."
47
48    if (sscanf(version, "OpenGL ES %d.%d", &mVersionMajor, &mVersionMinor) != 2) {
49        // If we cannot parse the version number, assume OpenGL ES 2.0
50        mVersionMajor = 2;
51        mVersionMinor = 0;
52    }
53
54    auto extensions = StringUtils::split((const char*) glGetString(GL_EXTENSIONS));
55    mHasNPot = extensions.has("GL_OES_texture_npot");
56    mHasFramebufferFetch = extensions.has("GL_NV_shader_framebuffer_fetch");
57    mHasDiscardFramebuffer = extensions.has("GL_EXT_discard_framebuffer");
58    mHasDebugMarker = extensions.has("GL_EXT_debug_marker");
59    mHas1BitStencil = extensions.has("GL_OES_stencil1");
60    mHas4BitStencil = extensions.has("GL_OES_stencil4");
61    mHasUnpackSubImage = extensions.has("GL_EXT_unpack_subimage");
62
63    mHasSRGB = mVersionMajor >= 3 || extensions.has("GL_EXT_sRGB");
64    mHasSRGBWriteControl = extensions.has("GL_EXT_sRGB_write_control");
65
66#ifdef ANDROID_ENABLE_LINEAR_BLENDING
67    // If linear blending is enabled, the device must have (ES3.0 or EXT_sRGB)
68    // and EXT_sRGB_write_control
69    LOG_ALWAYS_FATAL_IF(!mHasSRGB, "Linear blending requires ES 3.0 or EXT_sRGB");
70    LOG_ALWAYS_FATAL_IF(!mHasSRGBWriteControl, "Linear blending requires EXT_sRGB_write_control");
71
72    mHasLinearBlending = true;
73#else
74    mHasLinearBlending = false;
75#endif
76}
77
78}; // namespace uirenderer
79}; // namespace android
80