drm: add support for DMA-BUFs

Mesa's Vulkan WSI still uses wl_drm when modifiers aren't supported.
This has been fixed in [1] but will take some time to be propagated
to users. In the meantime, add a fallback.

[1]: https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4942

1 files changed, 16 insertions, 0 deletions

diff --git a/include/wlr/types/wlr_drm.h b/include/wlr/types/wlr_drm.h
index 51764928..efcf139f 100644
--- a/include/wlr/types/wlr_drm.h
+++ b/include/wlr/types/wlr_drm.h
@@ -13,6 +13,15 @@
 
 struct wlr_renderer;
 
+struct wlr_drm_buffer {
+	struct wlr_buffer base;
+
+	struct wl_resource *resource; // can be NULL if the client destroyed it
+	struct wlr_dmabuf_attributes dmabuf;
+
+	struct wl_listener release;
+};
+
 /**
  * A stub implementation of Mesa's wl_drm protocol.
  *
@@ -21,6 +30,7 @@ struct wlr_renderer;
  */
 struct wlr_drm {
 	struct wl_global *global;
+	struct wlr_renderer *renderer;
 	char *node_name;
 
 	struct {
@@ -28,8 +38,14 @@ struct wlr_drm {
 	} events;
 
 	struct wl_listener display_destroy;
+	struct wl_listener renderer_destroy;
 };
 
+bool wlr_drm_buffer_is_resource(struct wl_resource *resource);
+
+struct wlr_drm_buffer *wlr_drm_buffer_from_resource(
+	struct wl_resource *resource);
+
 struct wlr_drm *wlr_drm_create(struct wl_display *display,
 	struct wlr_renderer *renderer);