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
30 namespace android {
31 namespace uirenderer {
32
Extensions()33 Extensions::Extensions() {
34 if (Properties::isSkiaEnabled()) {
35 return;
36 }
37 const char* version = (const char*)glGetString(GL_VERSION);
38
39 // Section 6.1.5 of the OpenGL ES specification indicates the GL version
40 // string strictly follows this format:
41 //
42 // OpenGL<space>ES<space><version number><space><vendor-specific information>
43 //
44 // In addition section 6.1.5 describes the version number thusly:
45 //
46 // "The version number is either of the form major number.minor number or
47 // major number.minor number.release number, where the numbers all have one
48 // or more digits. The release number and vendor specific information are
49 // optional."
50
51 if (sscanf(version, "OpenGL ES %d.%d", &mVersionMajor, &mVersionMinor) != 2) {
52 // If we cannot parse the version number, assume OpenGL ES 2.0
53 mVersionMajor = 2;
54 mVersionMinor = 0;
55 }
56
57 auto extensions = StringUtils::split((const char*)glGetString(GL_EXTENSIONS));
58 mHasNPot = extensions.has("GL_OES_texture_npot");
59 mHasFramebufferFetch = extensions.has("GL_NV_shader_framebuffer_fetch");
60 mHasDiscardFramebuffer = extensions.has("GL_EXT_discard_framebuffer");
61 mHasDebugMarker = extensions.has("GL_EXT_debug_marker");
62 mHas1BitStencil = extensions.has("GL_OES_stencil1");
63 mHas4BitStencil = extensions.has("GL_OES_stencil4");
64 mHasUnpackSubImage = extensions.has("GL_EXT_unpack_subimage");
65 mHasRenderableFloatTexture = extensions.has("GL_OES_texture_half_float");
66
67 mHasSRGB = mVersionMajor >= 3 || extensions.has("GL_EXT_sRGB");
68 mHasSRGBWriteControl = extensions.has("GL_EXT_sRGB_write_control");
69
70 #ifdef ANDROID_ENABLE_LINEAR_BLENDING
71 // If linear blending is enabled, the device must have (ES3.0 or EXT_sRGB)
72 // and EXT_sRGB_write_control
73 LOG_ALWAYS_FATAL_IF(!mHasSRGB, "Linear blending requires ES 3.0 or EXT_sRGB");
74 LOG_ALWAYS_FATAL_IF(!mHasSRGBWriteControl, "Linear blending requires EXT_sRGB_write_control");
75
76 mHasLinearBlending = true;
77 #else
78 mHasLinearBlending = false;
79 #endif
80 }
81
82 }; // namespace uirenderer
83 }; // namespace android
84