1 files changed, 5 insertions, 0 deletions
diff --git a/video/out/gl_common.h b/video/out/gl_common.h
index 8a133784c7..1c908cfa2b 100644
--- a/video/out/gl_common.h
+++ b/video/out/gl_common.h
@@ -118,6 +118,11 @@ typedef struct MPGLContext {
     // If false, OpenGL renderers should not draw anything.
     bool (*is_active)(struct MPGLContext *);
 
+    // Optional callback on the beginning of a frame. The frame will be finished
+    // with swapGlBuffers(). Like is_active, this returns false if use of the
+    // OpenGL context should be avoided.
+    bool (*start_frame)(struct MPGLContext *);
+
     // For free use by the backend.
     void *priv;
 } MPGLContext;