[PATCH xserver] xwayland: add envvar XWAYLAND_NO_GLAMOR

[Olivier Fourdan]

Not all compositors allow for customizing the Xwayland command line,
gnome-shell/mutter for example have the command line and path to
Xwayland binary hardcoded, which makes it harder for users to disable
glamor acceleration in Xwayland (glamor being used by default).

Add an environment variable XWAYLAND_NO_GLAMOR t odiable glamor support
in Xwayland.

Signed-off-by: Olivier Fourdan <ofourdan at redhat.com>
---
 hw/xwayland/xwayland-glamor.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/hw/xwayland/xwayland-glamor.c b/hw/xwayland/xwayland-glamor.c
index b3d0aab..45de54f 100644
--- a/hw/xwayland/xwayland-glamor.c
+++ b/hw/xwayland/xwayland-glamor.c
@@ -549,6 +549,13 @@ Bool
 xwl_glamor_init(struct xwl_screen *xwl_screen)
 {
     ScreenPtr screen = xwl_screen->screen;
+    const char *no_glamor_env;
+
+    no_glamor_env = getenv("XWAYLAND_NO_GLAMOR");
+    if (no_glamor_env && *no_glamor_env != '0') {
+        ErrorF("Disabling glamor and dri3 support, XWAYLAND_NO_GLAMOR is set\n");
+        return FALSE;
+    }
 
     if (xwl_screen->egl_context == EGL_NO_CONTEXT) {
         ErrorF("Disabling glamor and dri3, EGL setup failed\n");
-- 
2.9.3