void
init(void) {
load("libEGL.so.1");
initX();
eglExtensions = eglQueryString(EGL_NO_DISPLAY, EGL_EXTENSIONS);
if (eglExtensions &&
checkExtension("EGL_EXT_platform_x11", eglExtensions)) {
Attributes<EGLint> attribs;
attribs.add(EGL_PLATFORM_X11_SCREEN_EXT, screen);
attribs.add(EGL_NONE);
eglDisplay = eglGetPlatformDisplayEXT(EGL_PLATFORM_X11_EXT, display, attribs);
} else {
eglDisplay = eglGetDisplay((EGLNativeDisplayType)display);
}
if (eglDisplay == EGL_NO_DISPLAY) {
std::cerr << "error: unable to get EGL display\n";
XCloseDisplay(display);
exit(1);
}
EGLint major, minor;
if (!eglInitialize(eglDisplay, &major, &minor)) {
std::cerr << "error: unable to initialize EGL display\n";
XCloseDisplay(display);
exit(1);
}
eglExtensions = eglQueryString(eglDisplay, EGL_EXTENSIONS);
has_EGL_KHR_create_context = checkExtension("EGL_KHR_create_context", eglExtensions);
}
static void
create_gl_core_context()
{
const char *client_extensions = eglQueryString(EGL_NO_DISPLAY,
EGL_EXTENSIONS);
if (!client_extensions) {
fprintf(stderr, "ERROR: Missing EGL_EXT_client_extensions\n");
exit(1);
}
if (!strstr(client_extensions, "EGL_MESA_platform_gbm")) {
fprintf(stderr, "ERROR: Missing EGL_MESA_platform_gbm\n");
exit(1);
}
fd = open("/dev/dri/renderD128", O_RDWR);
if (unlikely(fd < 0)) {
fprintf(stderr, "ERROR: Couldn't open /dev/dri/renderD128\n");
exit(1);
}
struct gbm_device *gbm = gbm_create_device(fd);
if (unlikely(gbm == NULL)) {
fprintf(stderr, "ERROR: Couldn't create gbm device\n");
exit(1);
}
egl_dpy = eglGetPlatformDisplayEXT(EGL_PLATFORM_GBM_MESA,
gbm, NULL);
if (unlikely(egl_dpy == EGL_NO_DISPLAY)) {
fprintf(stderr, "ERROR: eglGetDisplay() failed\n");
exit(1);
}
if (unlikely(!eglInitialize(egl_dpy, NULL, NULL))) {
fprintf(stderr, "ERROR: eglInitialize() failed\n");
exit(1);
}
static const char *egl_extension[] = {
"EGL_KHR_create_context",
"EGL_KHR_surfaceless_context"
};
const char *extension_string = eglQueryString(egl_dpy, EGL_EXTENSIONS);
for (int i = 0; i < ARRAY_SIZE(egl_extension); i++) {
if (strstr(extension_string, egl_extension[i]) == NULL) {
fprintf(stderr, "ERROR: Missing %s\n", egl_extension[i]);
exit(1);
}
}
static const EGLint config_attribs[] = {
EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
EGL_NONE
};
EGLConfig cfg;
EGLint count;
if (!eglChooseConfig(egl_dpy, config_attribs, &cfg, 1, &count) ||
count == 0) {
fprintf(stderr, "ERROR: eglChooseConfig() failed\n");
exit(1);
}
eglBindAPI(EGL_OPENGL_API);
static const EGLint attribs[] = {
EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR,
EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR,
EGL_CONTEXT_MAJOR_VERSION_KHR, 4,
EGL_CONTEXT_MINOR_VERSION_KHR, 3,
EGL_NONE
};
ctx = eglCreateContext(egl_dpy, cfg, EGL_NO_CONTEXT, attribs);
if (ctx == EGL_NO_CONTEXT) {
fprintf(stderr, "eglCreateContext(GL 3.2) failed.\n");
exit(1);
}
if (!eglMakeCurrent(egl_dpy, EGL_NO_SURFACE, EGL_NO_SURFACE, ctx)) {
fprintf(stderr, "eglMakeCurrent failed.\n");
exit(1);
}
}