File size: 6,358 Bytes
d5f2893 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 | //g++ glad/egl.c glad/gl.c egl.cpp -I glad -lpthread -ldl
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <unistd.h>
#include <glad/egl.h>
#include <glad/gl.h>
struct EGLInternalData2 {
bool m_isInitialized;
int m_windowWidth;
int m_windowHeight;
int m_renderDevice;
EGLBoolean success;
EGLint num_configs;
EGLConfig egl_config;
EGLSurface egl_surface;
EGLContext egl_context;
EGLDisplay egl_display;
EGLInternalData2()
: m_isInitialized(false),
m_windowWidth(0),
m_windowHeight(0) {}
};
int main(){
int m_windowWidth;
int m_windowHeight;
int m_renderDevice;
EGLBoolean success;
EGLint num_configs;
EGLConfig egl_config;
EGLSurface egl_surface;
EGLContext egl_context;
EGLDisplay egl_display;
m_windowWidth = 256;
m_windowHeight = 256;
m_renderDevice = -1;
EGLint egl_config_attribs[] = {EGL_RED_SIZE,
8,
EGL_GREEN_SIZE,
8,
EGL_BLUE_SIZE,
8,
EGL_DEPTH_SIZE,
8,
EGL_SURFACE_TYPE,
EGL_PBUFFER_BIT,
EGL_RENDERABLE_TYPE,
EGL_OPENGL_BIT,
EGL_NONE};
EGLint egl_pbuffer_attribs[] = {
EGL_WIDTH, m_windowWidth, EGL_HEIGHT, m_windowHeight,
EGL_NONE,
};
EGLInternalData2* m_data = new EGLInternalData2();
// Load EGL functions
int egl_version = gladLoaderLoadEGL(NULL);
if(!egl_version) {
fprintf(stderr, "failed to EGL with glad.\n");
exit(EXIT_FAILURE);
};
// Query EGL Devices
const int max_devices = 32;
EGLDeviceEXT egl_devices[max_devices];
EGLint num_devices = 0;
EGLint egl_error = eglGetError();
if (!eglQueryDevicesEXT(max_devices, egl_devices, &num_devices) ||
egl_error != EGL_SUCCESS) {
printf("eglQueryDevicesEXT Failed.\n");
m_data->egl_display = EGL_NO_DISPLAY;
}
// Query EGL Screens
if(m_data->m_renderDevice == -1) {
// Chose default screen, by trying all
for (EGLint i = 0; i < num_devices; ++i) {
// Set display
EGLDisplay display = eglGetPlatformDisplayEXT(EGL_PLATFORM_DEVICE_EXT,
egl_devices[i], NULL);
if (eglGetError() == EGL_SUCCESS && display != EGL_NO_DISPLAY) {
int major, minor;
EGLBoolean initialized = eglInitialize(display, &major, &minor);
if (eglGetError() == EGL_SUCCESS && initialized == EGL_TRUE) {
m_data->egl_display = display;
}
}
}
} else {
// Chose specific screen, by using m_renderDevice
if (m_data->m_renderDevice < 0 || m_data->m_renderDevice >= num_devices) {
fprintf(stderr, "Invalid render_device choice: %d < %d.\n", m_data->m_renderDevice, num_devices);
exit(EXIT_FAILURE);
}
// Set display
EGLDisplay display = eglGetPlatformDisplayEXT(EGL_PLATFORM_DEVICE_EXT,
egl_devices[m_data->m_renderDevice], NULL);
if (eglGetError() == EGL_SUCCESS && display != EGL_NO_DISPLAY) {
int major, minor;
EGLBoolean initialized = eglInitialize(display, &major, &minor);
if (eglGetError() == EGL_SUCCESS && initialized == EGL_TRUE) {
m_data->egl_display = display;
}
}
}
if (!eglInitialize(m_data->egl_display, NULL, NULL)) {
fprintf(stderr, "Unable to initialize EGL\n");
exit(EXIT_FAILURE);
}
egl_version = gladLoaderLoadEGL(m_data->egl_display);
if (!egl_version) {
fprintf(stderr, "Unable to reload EGL.\n");
exit(EXIT_FAILURE);
}
printf("Loaded EGL %d.%d after reload.\n", GLAD_VERSION_MAJOR(egl_version),
GLAD_VERSION_MINOR(egl_version));
m_data->success = eglBindAPI(EGL_OPENGL_API);
if (!m_data->success) {
// TODO: Properly handle this error (requires change to default window
// API to change return on all window types to bool).
fprintf(stderr, "Failed to bind OpenGL API.\n");
exit(EXIT_FAILURE);
}
m_data->success =
eglChooseConfig(m_data->egl_display, egl_config_attribs,
&m_data->egl_config, 1, &m_data->num_configs);
if (!m_data->success) {
// TODO: Properly handle this error (requires change to default window
// API to change return on all window types to bool).
fprintf(stderr, "Failed to choose config (eglError: %d)\n", eglGetError());
exit(EXIT_FAILURE);
}
if (m_data->num_configs != 1) {
fprintf(stderr, "Didn't get exactly one config, but %d\n", m_data->num_configs);
exit(EXIT_FAILURE);
}
m_data->egl_surface = eglCreatePbufferSurface(
m_data->egl_display, m_data->egl_config, egl_pbuffer_attribs);
if (m_data->egl_surface == EGL_NO_SURFACE) {
fprintf(stderr, "Unable to create EGL surface (eglError: %d)\n", eglGetError());
exit(EXIT_FAILURE);
}
m_data->egl_context = eglCreateContext(
m_data->egl_display, m_data->egl_config, EGL_NO_CONTEXT, NULL);
if (!m_data->egl_context) {
fprintf(stderr, "Unable to create EGL context (eglError: %d)\n",eglGetError());
exit(EXIT_FAILURE);
}
m_data->success =
eglMakeCurrent(m_data->egl_display, m_data->egl_surface, m_data->egl_surface,
m_data->egl_context);
if (!m_data->success) {
fprintf(stderr, "Failed to make context current (eglError: %d)\n", eglGetError());
exit(EXIT_FAILURE);
}
if (!gladLoadGL(eglGetProcAddress)) {
fprintf(stderr, "failed to load GL with glad.\n");
exit(EXIT_FAILURE);
}
const GLubyte* ven = glGetString(GL_VENDOR);
printf("GL_VENDOR=%s\n", ven);
const GLubyte* ren = glGetString(GL_RENDERER);
printf("GL_RENDERER=%s\n", ren);
const GLubyte* ver = glGetString(GL_VERSION);
printf("GL_VERSION=%s\n", ver);
const GLubyte* sl = glGetString(GL_SHADING_LANGUAGE_VERSION);
printf("GL_SHADING_LANGUAGE_VERSION=%s\n", sl);
}
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