xorg: initialize glamor provider

This allows Xorg to use Glamor GLX when Glamor is requested,
and eliminates usage of DRI2 in case of Glamor.

Signed-off-by: Konstantin Pugin <ria.freelander@gmail.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Acked-by: Emma Anholt <emma@anholt.net>

glamor/glamor_egl.c

@@ -46,6 +46,7 @@
 
 #include "glamor.h"
 #include "glamor_priv.h"
+#include "glamor_glx_provider.h"
 #include "dri3.h"
 
 struct glamor_egl_screen_private {
@@ -886,6 +887,9 @@ glamor_egl_screen_init(ScreenPtr screen, struct glamor_context *glamor_ctx)
         glamor_egl_get_screen_private(scrn);
 #ifdef DRI3
     glamor_screen_private *glamor_priv = glamor_get_screen_private(screen);
+#endif
+#ifdef GLXEXT
+    static Bool vendor_initialized = FALSE;
 #endif
     const char *gbm_backend_name;
 
@@ -927,6 +931,13 @@ glamor_egl_screen_init(ScreenPtr screen, struct glamor_context *glamor_ctx)
         }
     }
 #endif
+#ifdef GLXEXT
+    if (!vendor_initialized) {
+        GlxPushProvider(&glamor_provider);
+        xorgGlxCreateVendor();
+        vendor_initialized = TRUE;
+    }
+#endif
 }
 
 static void glamor_egl_cleanup(struct glamor_egl_screen_private *glamor_egl)

hw/xfree86/glamor_egl/meson.build

@@ -15,7 +15,7 @@ shared_module(
         dependency('libdrm', version: '>= 2.4.46'),
         gbm_dep,
     ],
-    link_with: glamor,
+    link_with: [glamor, libxserver_glx],
 
     install: true,
     install_dir: module_dir,