vo_opengl_cb: make mpv_opengl_cb_render() return left frames

Instead of error code which was not helpful because it's always 0,
mpv_opengl_cb_render() returns the number of left frames in the
frame queue now.

1 files changed, 1 insertions, 1 deletions

diff --git a/libmpv/opengl_cb.h b/libmpv/opengl_cb.h
index 042a5a46aa..bf6dfb4136 100644
--- a/libmpv/opengl_cb.h
+++ b/libmpv/opengl_cb.h
@@ -191,7 +191,7 @@ int mpv_opengl_cb_init_gl(mpv_opengl_cb_context *ctx, const char *exts,
  *           image - the renderer will flip it before setting the viewport
  *           (typically you want to flip the image if you are rendering
  *           directly to the main framebuffer).
- * @return error code
+ * @return the number of left frames in the internal queue to be rendered
  */
 int mpv_opengl_cb_render(mpv_opengl_cb_context *ctx, int fbo, int vp[4]);