[mutter] screen-cast: Test allocate DMA buffer with implicit API

[Marge Bot <marge-bot src gnome org>]

commit 2b4a24132bc5e5d0ed8dd097ef155d083e302187
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri Apr 22 11:23:07 2022 +0200

    screen-cast: Test allocate DMA buffer with implicit API
    
    DMA buffers might be allocatable, but it doesn't mean the driver doesn't
    fail when we try to allocate a buffer with an implicit modifier. Using
    the proprietary NVIDIA driver for example, it will fail. Lets catch this
    up front and avoid advertising DMA buffer support when we know it won't
    work.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2383>

 cogl/cogl/cogl-dma-buf-handle.h           |  2 ++
 src/backends/native/meta-backend-native.c | 17 +++++++++++++++++
 2 files changed, 19 insertions(+)
---
diff --git a/cogl/cogl/cogl-dma-buf-handle.h b/cogl/cogl/cogl-dma-buf-handle.h
index c505ff76c1..4081566842 100644
--- a/cogl/cogl/cogl-dma-buf-handle.h
+++ b/cogl/cogl/cogl-dma-buf-handle.h
@@ -141,4 +141,6 @@ cogl_dma_buf_handle_get_offset (CoglDmaBufHandle *dmabuf_handle);
 COGL_EXPORT int
 cogl_dma_buf_handle_get_bpp (CoglDmaBufHandle *dmabuf_handle);
 
+G_DEFINE_AUTOPTR_CLEANUP_FUNC (CoglDmaBufHandle, cogl_dma_buf_handle_free)
+
 #endif /* __COGL_DMA_BUF_HANDLE_H__ */
diff --git a/src/backends/native/meta-backend-native.c b/src/backends/native/meta-backend-native.c
index 5a59d7dd51..2245387876 100644
--- a/src/backends/native/meta-backend-native.c
+++ b/src/backends/native/meta-backend-native.c
@@ -160,6 +160,13 @@ maybe_disable_screen_cast_dma_bufs (MetaBackendNative *native)
   MetaBackend *backend = META_BACKEND (native);
   MetaRenderer *renderer = meta_backend_get_renderer (backend);
   MetaScreenCast *screen_cast = meta_backend_get_screen_cast (backend);
+  ClutterBackend *clutter_backend =
+    meta_backend_get_clutter_backend (backend);
+  CoglContext *cogl_context =
+    clutter_backend_get_cogl_context (clutter_backend);
+  CoglRenderer *cogl_renderer = cogl_context_get_renderer (cogl_context);
+  g_autoptr (GError) error = NULL;
+  g_autoptr (CoglDmaBufHandle) dmabuf_handle = NULL;
 
   if (!meta_renderer_is_hardware_accelerated (renderer))
     {
@@ -167,6 +174,16 @@ maybe_disable_screen_cast_dma_bufs (MetaBackendNative *native)
                  "(not hardware accelerated)");
       meta_screen_cast_disable_dma_bufs (screen_cast);
     }
+
+  dmabuf_handle = cogl_renderer_create_dma_buf (cogl_renderer,
+                                                1, 1,
+                                                &error);
+  if (!dmabuf_handle)
+    {
+      g_message ("Disabling DMA buffer screen sharing "
+                 "(implicit modifiers not supported)");
+      meta_screen_cast_disable_dma_bufs (screen_cast);
+    }
 }
 #endif /* HAVE_REMOTE_DESKTOP */