gallium: initialize simple screen in drivers
diff --git a/src/gallium/drivers/i915simple/i915_screen.c b/src/gallium/drivers/i915simple/i915_screen.c
index 069cc33..5bb127f 100644
--- a/src/gallium/drivers/i915simple/i915_screen.c
+++ b/src/gallium/drivers/i915simple/i915_screen.c
@@ -27,6 +27,7 @@
 
 
 #include "util/u_memory.h"
+#include "util/u_simple_screen.h"
 #include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_inlines.h"
 #include "util/u_string.h"
@@ -279,6 +280,7 @@
    i915screen->screen.surface_unmap = i915_surface_unmap;
 
    i915_init_screen_texture_functions(&i915screen->screen);
+   u_simple_screen_init(&i915screen->screen);
 
    return &i915screen->screen;
 }