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render/egl: add support for EGL_KHR_display_reference

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See the spec at [1]. tl;dr EGL has terrible defaults: eglTerminate()
may have side-effects on completely unrelated EGLDisplay objects.
This extension allows us to opt-in to get the sane behavior:
eglTerminate() only free's our own EGLDisplay without affecting
others.

[1]: https://registry.khronos.org/EGL/extensions/KHR/EGL_KHR_display_reference.txt
This commit is contained in:
Simon Ser 2022-09-16 20:44:46 +02:00 • committed by Simon Zeni
parent 2ad25b1460
commit 5206cea566
2 changed files with 15 additions and 2 deletions
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1
include/render/egl.h
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@ -24,6 +24,7 @@ struct wlr_egl {
bool EXT_device_query;
bool KHR_platform_gbm;
bool EXT_platform_device;
bool KHR_display_reference;
} exts;
struct {

16
render/egl.c
View file

@ -207,9 +207,10 @@ static struct wlr_egl *egl_create(void) {
egl->exts.KHR_platform_gbm = check_egl_ext(client_exts_str,
"EGL_KHR_platform_gbm");
egl->exts.EXT_platform_device = check_egl_ext(client_exts_str,
"EGL_EXT_platform_device");
egl->exts.KHR_display_reference = check_egl_ext(client_exts_str,
"EGL_KHR_display_reference");
if (check_egl_ext(client_exts_str, "EGL_EXT_device_base") || check_egl_ext(client_exts_str, "EGL_EXT_device_enumeration")) {
load_egl_proc(&egl->procs.eglQueryDevicesEXT, "eglQueryDevicesEXT");
@ -351,8 +352,19 @@ static bool egl_init_display(struct wlr_egl *egl, EGLDisplay display) {
static bool egl_init(struct wlr_egl *egl, EGLenum platform,
void *remote_display) {
EGLint display_attribs[3] = {0};
size_t display_attribs_len = 0;
if (egl->exts.KHR_display_reference) {
display_attribs[display_attribs_len++] = EGL_TRACK_REFERENCES_KHR;
display_attribs[display_attribs_len++] = EGL_TRUE;
}
display_attribs[display_attribs_len++] = EGL_NONE;
assert(display_attribs_len < sizeof(display_attribs) / sizeof(display_attribs[0]));
EGLDisplay display = egl->procs.eglGetPlatformDisplayEXT(platform,
remote_display, NULL);
remote_display, display_attribs);
if (display == EGL_NO_DISPLAY) {
wlr_log(WLR_ERROR, "Failed to create EGL display");
return false;