1 /*
2 * Copyright (C) 2021 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 "host/libs/graphics_detector/egl.h"
18
19 #include <GLES/gl.h>
20 #include <android-base/logging.h>
21 #include <android-base/strings.h>
22
23 namespace cuttlefish {
24 namespace {
25
26 constexpr const char kEglLib[] = "libEGL.so";
27 constexpr const char kEglLibAlt[] = "libEGL.so.1";
28
LoadEglLib()29 std::optional<Lib> LoadEglLib() {
30 for (const auto* possible_name : {kEglLib, kEglLibAlt}) {
31 auto lib_opt = Lib::Load(possible_name);
32 if (!lib_opt) {
33 LOG(VERBOSE) << "Failed to load " << possible_name;
34 } else {
35 LOG(VERBOSE) << "Loaded " << possible_name;
36 return std::move(lib_opt);
37 }
38 }
39 return std::nullopt;
40 }
41
42 } // namespace
43
44 /*static*/
Load()45 std::optional<Egl> Egl::Load() {
46 auto lib_opt = LoadEglLib();
47 if (!lib_opt) {
48 return std::nullopt;
49 }
50
51 Egl egl;
52 egl.lib_ = std::move(*lib_opt);
53
54 #define LOAD_EGL_FUNCTION_POINTER(return_type, function_name, signature) \
55 egl.function_name = reinterpret_cast<return_type(GL_APIENTRY*) signature>( \
56 egl.lib_.GetSymbol(#function_name)); \
57 if (egl.function_name == nullptr) { \
58 egl.function_name = reinterpret_cast<return_type(GL_APIENTRY*) signature>( \
59 egl.eglGetProcAddress(#function_name)); \
60 } \
61 if (egl.function_name == nullptr) { \
62 LOG(VERBOSE) << "Failed to load EGL function: " << #function_name; \
63 } else { \
64 LOG(VERBOSE) << "Loaded EGL function: " << #function_name; \
65 }
66
67 FOR_EACH_EGL_FUNCTION(LOAD_EGL_FUNCTION_POINTER);
68
69 egl.Init();
70
71 return std::move(egl);
72 }
73
Init()74 void Egl::Init() {
75 EGLDisplay display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
76 if (display == EGL_NO_DISPLAY) {
77 LOG(FATAL) << "Failed to get default display";
78 }
79
80 EGLint client_version_major = 0;
81 EGLint client_version_minor = 0;
82 if (eglInitialize(display, &client_version_major, &client_version_minor) !=
83 EGL_TRUE) {
84 LOG(FATAL) << "Failed to initialize display.";
85 return;
86 }
87 LOG(VERBOSE) << "Found EGL client version " << client_version_major << "."
88 << client_version_minor;
89
90 const std::string vendor_string = eglQueryString(display, EGL_VENDOR);
91 if (vendor_string.empty()) {
92 LOG(FATAL) << "Failed to query vendor.";
93 return;
94 }
95 LOG(VERBOSE) << "Found EGL vendor: " << vendor_string;
96
97 const std::string extensions_string = eglQueryString(display, EGL_EXTENSIONS);
98 if (extensions_string.empty()) {
99 LOG(FATAL) << "Failed to query extensions.";
100 return;
101 }
102 LOG(VERBOSE) << "Found EGL extensions: " << extensions_string;
103
104 if (eglBindAPI(EGL_OPENGL_ES_API) == EGL_FALSE) {
105 LOG(FATAL) << "Failed to bind GLES API.";
106 return;
107 }
108
109 const EGLint attribs[] = {
110 // clang-format off
111 EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
112 EGL_RENDERABLE_TYPE, EGL_OPENGL_ES3_BIT,
113 EGL_RED_SIZE, 8,
114 EGL_GREEN_SIZE, 8,
115 EGL_BLUE_SIZE, 8,
116 EGL_ALPHA_SIZE, 8,
117 EGL_NONE,
118 // clang-format on
119 };
120
121 EGLConfig config;
122 EGLint num_configs = 0;
123 if (eglChooseConfig(display, attribs, &config, 1, &num_configs) != EGL_TRUE) {
124 LOG(FATAL) << "Failed to find matching framebuffer config.";
125 return;
126 }
127 LOG(VERBOSE) << "Found matching framebuffer config.";
128
129 const EGLint pbuffer_attribs[] = {
130 // clang-format off
131 EGL_WIDTH, 720,
132 EGL_HEIGHT, 720,
133 EGL_NONE,
134 // clang-format on
135 };
136
137 EGLSurface primary_surface =
138 eglCreatePbufferSurface(display, config, pbuffer_attribs);
139 if (primary_surface == EGL_NO_SURFACE) {
140 LOG(FATAL) << "Failed to create EGL surface.";
141 return;
142 }
143
144 const EGLint context_attribs[] = {
145 // clang-format off
146 EGL_CONTEXT_CLIENT_VERSION, 3,
147 EGL_NONE
148 // clang-format on
149 };
150
151 EGLContext primary_context =
152 eglCreateContext(display, config, EGL_NO_CONTEXT, context_attribs);
153 if (primary_context == EGL_NO_CONTEXT) {
154 LOG(FATAL) << "Failed to create EGL context.";
155 return;
156 }
157
158 if (eglMakeCurrent(display, primary_surface, primary_surface,
159 primary_context) == EGL_FALSE) {
160 LOG(FATAL) << "Failed to make primary EGL context/surface current.";
161 return;
162 }
163 }
164
165 } // namespace cuttlefish