gtk4: Reset app context and display if GL context creation fails

No need to keep them around and that way we either have all 3 values set
or none of them.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1038>

1 files changed, 8 insertions, 0 deletions

diff --git a/video/gtk4/src/sink/imp.rs b/video/gtk4/src/sink/imp.rs
index 4dea878e6..8a9332ed0 100644
--- a/video/gtk4/src/sink/imp.rs
+++ b/video/gtk4/src/sink/imp.rs
@@ -678,6 +678,8 @@ impl PaintableSink {
             Ok(_) => gst::info!(CAT, imp: self, "Successfully activated GL Context."),
             Err(_) => {
                 gst::error!(CAT, imp: self, "Failed to activate GL context",);
+                *app_ctx_guard = None;
+                *display_guard = None;
                 return false;
             }
         };
@@ -696,12 +698,16 @@ impl PaintableSink {
                     "Failed to deactivate the context after failing fill info",
                 );
             }
+            *app_ctx_guard = None;
+            *display_guard = None;
 
             return false;
         }
 
         if app_ctx.activate(false).is_err() {
             gst::error!(CAT, imp: self, "Failed to deactivate GL context",);
+            *app_ctx_guard = None;
+            *display_guard = None;
             return false;
         }
 
@@ -720,6 +726,8 @@ impl PaintableSink {
             }
             Err(err) => {
                 gst::error!(CAT, imp: self, "Could not create GL context: {err}");
+                *app_ctx_guard = None;
+                *display_guard = None;
                 false
             }
         }