Signed-off-by: Bryce Harrington <[email protected]>
---
src/main.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/src/main.c b/src/main.c
index 7370292..310382a 100644
--- a/src/main.c
+++ b/src/main.c
@@ -748,6 +748,19 @@ load_drm_backend(struct weston_compositor *c, const char
*backend,
"gbm-format", &config->base.format,
NULL);
+ /* Use a major/minor versioning scheme to enable backends to detect
+ * ABI changes in the config struct we're passing in.
+ *
+ * NOTE: Alternate designs were proposed for using opaque structures[1]
+ * and for section+key/value getter/setters[2]. The rationale for
+ * selecting the transparent structure design is based on several
+ * assumptions[3] which may require re-evaluating the design choice
+ * if they fail to hold.
+ *
+ * 1:
https://lists.freedesktop.org/archives/wayland-devel/2016-February/026989.html
+ * 2:
https://lists.freedesktop.org/archives/wayland-devel/2016-February/026929.html
+ * 3:
https://lists.freedesktop.org/archives/wayland-devel/2016-February/027228.html
+ */
config->base.base.struct_version = 1;
config->base.base.struct_size = sizeof(struct
weston_drm_backend_config);
config->base.configure_output = drm_configure_output;
--
1.9.1
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