virglrenderer: Add VIRGL_RES_BIND_SHARED bind flag.

Allow external users to intercept resource creation based on
shared bind flag.

Signed-off-by: David Riley <davidriley@chromium.org>
Reviewed-By: Gert Wollny <gert.wollny@collabora.com>

src/virgl_hw.h

@@ -271,6 +271,7 @@ enum virgl_formats {
  * are only read by the host.
  */
 #define VIRGL_BIND_STAGING       (1 << 19)
+#define VIRGL_BIND_SHARED        (1 << 20)
 
 struct virgl_caps_bool_set1 {
         unsigned indep_blend_enable:1;

src/virglrenderer.h

@@ -96,6 +96,7 @@ VIRGL_EXPORT int virgl_renderer_get_fd_for_texture2(uint32_t tex_id, int *fd, in
 #define VIRGL_RES_BIND_CURSOR        (1 << 16)
 #define VIRGL_RES_BIND_CUSTOM        (1 << 17)
 #define VIRGL_RES_BIND_SCANOUT       (1 << 18)
+#define VIRGL_RES_BIND_SHARED        (1 << 20)
 
 struct virgl_renderer_resource_create_args {
    uint32_t handle;