virgl: Allow importing resources without known templ

On windows when external resources are imported
there is no information about them. And in such cases
resource_from_hanlde templ argument is equal NULL.

To support such case on virgl, virgl winsys can now
fill in template for resource, that will be used if
templ=NULL. Additionally helper functions were
added to convert virgl encoded enums to pipe.

Reviewed-by: Feng Jiang <jiangfeng@kylinos.cn>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27308>

src/gallium/drivers/virgl/virgl_resource.c

@@ -717,22 +717,29 @@ static struct pipe_resource *virgl_resource_from_handle(struct pipe_screen *scre
    uint32_t storage_size;
 
    struct virgl_screen *vs = virgl_screen(screen);
-   if (templ->target == PIPE_BUFFER)
+   if (templ && templ->target == PIPE_BUFFER)
       return NULL;
 
    struct virgl_resource *res = CALLOC_STRUCT(virgl_resource);
-   res->b = *templ;
+   if (templ)
+      res->b = *templ;
    res->b.screen = &vs->base;
    pipe_reference_init(&res->b.reference, 1);
 
    plane = winsys_stride = plane_offset = modifier = 0;
    res->hw_res = vs->vws->resource_create_from_handle(vs->vws, whandle,
+                                                      &res->b,
                                                       &plane,
                                                       &winsys_stride,
                                                       &plane_offset,
                                                       &modifier,
                                                       &res->blob_mem);
 
+   if (!res->hw_res) {
+      FREE(res);
+      return NULL;
+   }
+
    /* do not use winsys returns for guest storage info of classic resource */
    if (!res->blob_mem) {
       winsys_stride = 0;
@@ -742,10 +749,6 @@ static struct pipe_resource *virgl_resource_from_handle(struct pipe_screen *scre
 
    virgl_resource_layout(&res->b, &res->metadata, plane, winsys_stride,
                          plane_offset, modifier);
-   if (!res->hw_res) {
-      FREE(res);
-      return NULL;
-   }
 
    /*
    *  If the overall resource is larger than a single page in size, we can

src/gallium/drivers/virgl/virgl_winsys.h

@@ -27,6 +27,7 @@
 #include "virtio-gpu/virgl_hw.h"
 
 struct pipe_box;
+struct pipe_resource;
 struct pipe_fence_handle;
 struct winsys_handle;
 struct virgl_hw_res;
@@ -86,6 +87,7 @@ struct virgl_winsys {
 
    struct virgl_hw_res *(*resource_create_from_handle)(struct virgl_winsys *vws,
                                                        struct winsys_handle *whandle,
+                                                       struct pipe_resource *templ,
                                                        uint32_t *plane,
                                                        uint32_t *stride,
                                                        uint32_t *plane_offset,
@@ -184,5 +186,5 @@ static inline void virgl_ws_fill_new_caps_defaults(struct virgl_drm_caps *caps)
 }
 
 extern enum virgl_formats pipe_to_virgl_format(enum pipe_format format);
-
+extern enum pipe_format virgl_to_pipe_format(enum virgl_formats format);
 #endif

src/gallium/winsys/virgl/drm/virgl_drm_winsys.c

@@ -478,6 +478,7 @@ virgl_drm_winsys_resource_get_storage_size(struct virgl_winsys *qws,
 static struct virgl_hw_res *
 virgl_drm_winsys_resource_create_handle(struct virgl_winsys *qws,
                                         struct winsys_handle *whandle,
+                                        UNUSED struct pipe_resource *templ,
                                         uint32_t *plane,
                                         uint32_t *stride,
                                         uint32_t *plane_offset,