cogl/renderer: Add API to query DRM format modifiers

Will be used to do explicit modifier buffer allocation via the Cogl API.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3900>

cogl/cogl/cogl-renderer.c

@@ -594,6 +594,28 @@ cogl_renderer_get_driver (CoglRenderer *renderer)
   return renderer->driver;
 }
 
+GArray *
+cogl_renderer_query_drm_modifiers (CoglRenderer           *renderer,
+                                   CoglPixelFormat         format,
+                                   CoglDrmModifierFilter   filter,
+                                   GError                **error)
+{
+  const CoglWinsysVtable *winsys = _cogl_renderer_get_winsys (renderer);
+
+  if (winsys->renderer_query_drm_modifiers)
+    {
+      return winsys->renderer_query_drm_modifiers (renderer,
+                                                   format,
+                                                   filter,
+                                                   error);
+    }
+
+  g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
+               "CoglRenderer doesn't support querying drm modifiers");
+
+  return NULL;
+}
+
 CoglDmaBufHandle *
 cogl_renderer_create_dma_buf (CoglRenderer     *renderer,
                               CoglPixelFormat   format,

cogl/cogl/cogl-renderer.h

@@ -225,6 +225,18 @@ COGL_EXPORT CoglDriver
 cogl_renderer_get_driver (CoglRenderer *renderer);
 
 
+/**
+ * cogl_renderer_query_drm_modifiers: (skip)
+ * @renderer: A #CoglRenderer
+ * @format: The #CoglPixelFormat
+ * @error: (nullable): return location for a #GError
+ */
+COGL_EXPORT GArray *
+cogl_renderer_query_drm_modifiers (CoglRenderer           *renderer,
+                                   CoglPixelFormat         format,
+                                   CoglDrmModifierFilter   filter,
+                                   GError                **error);
+
 /**
  * cogl_renderer_create_dma_buf: (skip)
  * @renderer: A #CoglRenderer

cogl/cogl/winsys/cogl-winsys-private.h

@@ -107,6 +107,12 @@ typedef struct _CoglWinsysVtable
   void
   (*display_destroy) (CoglDisplay *display);
 
+  GArray *
+  (* renderer_query_drm_modifiers) (CoglRenderer           *renderer,
+                                    CoglPixelFormat         format,
+                                    CoglDrmModifierFilter   filter,
+                                    GError                **error);
+
   CoglDmaBufHandle *
   (*renderer_create_dma_buf) (CoglRenderer     *renderer,
                               CoglPixelFormat   format,

src/backends/native/meta-renderer-native.c

@@ -954,6 +954,34 @@ meta_renderer_native_queue_mode_set_update (MetaRendererNative *renderer_native,
   meta_kms_update_free (new_kms_update);
 }
 
+static GArray *
+meta_renderer_native_query_drm_modifiers (CoglRenderer           *cogl_renderer,
+                                          CoglPixelFormat         format,
+                                          CoglDrmModifierFilter   filter,
+                                          GError                **error)
+{
+  CoglRendererEGL *cogl_renderer_egl = cogl_renderer->winsys;
+  MetaRendererNativeGpuData *renderer_gpu_data = cogl_renderer_egl->platform;
+  const MetaFormatInfo *format_info;
+  uint32_t drm_format;
+  MetaRenderDevice *render_device;
+
+  format_info = meta_format_info_from_cogl_format (format);
+  if (!format_info)
+    {
+      g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND,
+                   "Format %s not supported",
+                   cogl_pixel_format_to_string (format));
+      return NULL;
+    }
+
+  drm_format = format_info->drm_format;
+
+  render_device = renderer_gpu_data->render_device;
+  return meta_render_device_query_drm_modifiers (render_device, drm_format,
+                                                 filter, error);
+}
+
 static void
 close_fds (int *fds,
            int  n_fds)
@@ -1304,6 +1332,7 @@ get_native_cogl_winsys_vtable (CoglRenderer *cogl_renderer)
 
       vtable.renderer_connect = meta_renderer_native_connect;
       vtable.renderer_disconnect = meta_renderer_native_disconnect;
+      vtable.renderer_query_drm_modifiers = meta_renderer_native_query_drm_modifiers;
       vtable.renderer_create_dma_buf = meta_renderer_native_create_dma_buf;
       vtable.renderer_is_dma_buf_supported =
         meta_renderer_native_is_dma_buf_supported;