cameraview.cc: call glFlush after creating fence

pd0wm · pd0wm · commit 8655f6df6bd9 · 2022-01-04T15:55:28.000+01:00
diff --git a/selfdrive/ui/qt/widgets/cameraview.cc b/selfdrive/ui/qt/widgets/cameraview.cc
@@ -309,6 +309,10 @@ void CameraViewWidget::vipcThread() {
           assert(glGetError() == GL_NO_ERROR);
 
           wait_fence.reset(new WaitFence());
+
+          // Ensure the fence is in the GPU command queue, or waiting on it might block
+          // https://www.khronos.org/opengl/wiki/Sync_Object#Flushing_and_contexts
+          glFlush();
         }
         latest_texture_id = buf->idx;
       }

Original file line number	Diff line number	Diff line change
`@@ -309,6 +309,10 @@ void CameraViewWidget::vipcThread() {`
`309`	`309`	`assert(glGetError() == GL_NO_ERROR);`
`310`	`310`
`311`	`311`	`wait_fence.reset(new WaitFence());`
	`312`	`+`
	`313`	`+ // Ensure the fence is in the GPU command queue, or waiting on it might block`
	`314`	`+ // https://www.khronos.org/opengl/wiki/Sync_Object#Flushing_and_contexts`
	`315`	`+ glFlush();`
`312`	`316`	`}`
`313`	`317`	`latest_texture_id = buf->idx;`
`314`	`318`	`}`