static Display *open_windowless_display(void)
{
Display *display = XOpenDisplay(NULL);
xcb_connection_t *xcb_conn;
xcb_screen_iterator_t screen_iterator;
xcb_screen_t *screen;
int screen_num;
if (!display) {
blog(LOG_ERROR, "Unable to open new X connection!");
return NULL;
}
xcb_conn = XGetXCBConnection(display);
if (!xcb_conn) {
blog(LOG_ERROR, "Unable to get XCB connection to main display");
goto error;
}
screen_iterator = xcb_setup_roots_iterator(xcb_get_setup(xcb_conn));
screen = screen_iterator.data;
if (!screen) {
blog(LOG_ERROR, "Unable to get screen root");
goto error;
}
screen_num = get_screen_num_from_root(xcb_conn, screen->root);
if (screen_num == -1) {
blog(LOG_ERROR, "Unable to get screen number from root");
goto error;
}
if (!gladLoadGLX(display, screen_num)) {
blog(LOG_ERROR, "Unable to load GLX entry functions.");
goto error;
}
return display;
error:
if (display)
XCloseDisplay(display);
return NULL;
}
extern bool gl_platform_init_swapchain(struct gs_swap_chain *swap)
{
Display *display = swap->device->plat->display;
struct gs_init_data *info = &swap->info;
xcb_connection_t *xcb_conn = XGetXCBConnection(display);
xcb_window_t wid = xcb_generate_id(xcb_conn);
xcb_window_t parent = swap->info.window.id;
xcb_get_geometry_reply_t *geometry =
get_window_geometry(xcb_conn, parent);
bool status = false;
int screen_num;
int visual;
GLXFBConfig *fb_config;
if (!geometry) goto fail_geometry_request;
screen_num = get_screen_num_from_root(xcb_conn, geometry->root);
if (screen_num == -1) {
goto fail_screen;
}
/* NOTE:
* So GLX is odd. You can have different extensions per screen,
* not just per video card or visual.
*
* Because of this, it makes sense to call LoadGLX everytime
* we open a frackin' window. In Windows, entry points can change
* so it makes more sense there. Here, despite it virtually never
* having the possibility of changing unless the user is intentionally
* being an asshole to cause this behavior, we still have to give it
* the correct screen num just out of good practice. *sigh*
*/
if (!gladLoadGLX(display, screen_num)) {
blog(LOG_ERROR, "Unable to load GLX entry functions.");
goto fail_load_glx;
}
/* Define our FBConfig hints for GLX... */
const int fb_attribs[] = {
GLX_STENCIL_SIZE, get_stencil_format_bits(info->zsformat),
GLX_DEPTH_SIZE, get_depth_format_bits(info->zsformat),
GLX_BUFFER_SIZE, get_color_format_bits(info->format),
GLX_DOUBLEBUFFER, true,
GLX_X_RENDERABLE, true,
None
};
/* ...fetch the best match... */
{
int num_configs;
fb_config = glXChooseFBConfig(display, screen_num,
fb_attribs, &num_configs);
if (!fb_config || !num_configs) {
blog(LOG_ERROR, "Failed to find FBConfig!");
goto fail_fb_config;
}
}
/* ...then fetch matching visual info for xcb. */
{
int error = glXGetFBConfigAttrib(display, fb_config[0], GLX_VISUAL_ID, &visual);
if (error) {
blog(LOG_ERROR, "Bad call to GetFBConfigAttrib!");
goto fail_visual_id;
}
}
xcb_colormap_t colormap = xcb_generate_id(xcb_conn);
uint32_t mask = XCB_CW_BORDER_PIXEL | XCB_CW_COLORMAP;
uint32_t mask_values[] = { 0, colormap, 0 };
xcb_create_colormap(xcb_conn,
XCB_COLORMAP_ALLOC_NONE,
colormap,
parent,
visual
);
xcb_create_window(
xcb_conn, 24 /* Hardcoded? */,
wid, parent,
0, 0,
geometry->width,
geometry->height,
0, 0,
visual, mask, mask_values
);
swap->wi->config = fb_config[0];
swap->wi->window = wid;
xcb_map_window(xcb_conn, wid);
XFree(fb_config);
status = true;
goto success;
fail_visual_id:
XFree(fb_config);
fail_fb_config:
fail_load_glx:
fail_screen:
fail_geometry_request:
success:
free(geometry);
return status;
}
extern bool gl_platform_init_swapchain(struct gs_swap_chain *swap)
{
Display *display = swap->device->plat->display;
xcb_connection_t *xcb_conn = XGetXCBConnection(display);
xcb_window_t wid = xcb_generate_id(xcb_conn);
xcb_window_t parent = swap->info.window.id;
xcb_get_geometry_reply_t *geometry =
get_window_geometry(xcb_conn, parent);
bool status = false;
int screen_num;
int visual;
GLXFBConfig *fb_config;
if (!geometry) goto fail_geometry_request;
screen_num = get_screen_num_from_root(xcb_conn, geometry->root);
if (screen_num == -1) {
goto fail_screen;
}
/* ...fetch the best match... */
{
int num_configs;
fb_config = glXChooseFBConfig(display, screen_num,
ctx_visual_attribs, &num_configs);
if (!fb_config || !num_configs) {
blog(LOG_ERROR, "Failed to find FBConfig!");
goto fail_fb_config;
}
}
/* ...then fetch matching visual info for xcb. */
{
int error = glXGetFBConfigAttrib(display, fb_config[0], GLX_VISUAL_ID, &visual);
if (error) {
blog(LOG_ERROR, "Bad call to GetFBConfigAttrib!");
goto fail_visual_id;
}
}
xcb_colormap_t colormap = xcb_generate_id(xcb_conn);
uint32_t mask = XCB_CW_BORDER_PIXEL | XCB_CW_COLORMAP;
uint32_t mask_values[] = { 0, colormap, 0 };
xcb_create_colormap(xcb_conn,
XCB_COLORMAP_ALLOC_NONE,
colormap,
parent,
visual
);
xcb_create_window(
xcb_conn, 24 /* Hardcoded? */,
wid, parent,
0, 0,
geometry->width,
geometry->height,
0, 0,
visual, mask, mask_values
);
swap->wi->config = fb_config[0];
swap->wi->window = wid;
xcb_map_window(xcb_conn, wid);
XFree(fb_config);
status = true;
goto success;
fail_visual_id:
XFree(fb_config);
fail_fb_config:
fail_screen:
fail_geometry_request:
success:
free(geometry);
return status;
}