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-rw-r--r--libmpv/opengl_cb.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/libmpv/opengl_cb.h b/libmpv/opengl_cb.h
index 1434c6cee3..0658a2e509 100644
--- a/libmpv/opengl_cb.h
+++ b/libmpv/opengl_cb.h
@@ -160,6 +160,9 @@ extern "C" {
* mpv_opengl_cb_window_pos struct pointer defined below.
* Note : The intended use is for hardware overlays that might require
* upscaling features (typically upscaling GL windows with drm to screen size).
+ *
+ * This is never used for GL rendering - only to map hardware overlays to
+ * GL rendering (for backends which support it).
*/
struct mpv_opengl_cb_window_pos {
int x; // left coordinates of window (usually 0)