From d57b1026a398f2707fbcb4415bd8b9b3bbcbd3b0 Mon Sep 17 00:00:00 2001
From: Joshua Ashton <joshua@froggi.es>
Date: Wed, 6 Sep 2023 20:28:34 +0100
Subject: [PATCH] drm: Add g_bForceAsyncFlips

---
 src/drm.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/drm.cpp b/src/drm.cpp
index dd0f5c8..c67418c 100644
--- a/src/drm.cpp
+++ b/src/drm.cpp
@@ -2464,6 +2464,8 @@ drm_prepare_liftoff( struct drm_t *drm, const struct FrameInfo_t *frameInfo, boo
 	return ret;
 }
 
+bool g_bForceAsyncFlips = false;
+
 /* Prepares an atomic commit for the provided scene-graph. Returns 0 on success,
  * negative errno on failure or if the scene-graph can't be presented directly. */
 int drm_prepare( struct drm_t *drm, bool async, const struct FrameInfo_t *frameInfo )
@@ -2546,7 +2548,7 @@ int drm_prepare( struct drm_t *drm, bool async, const struct FrameInfo_t *frameI
 	if ( drm->crtc != nullptr )
 		flags |= DRM_MODE_PAGE_FLIP_EVENT;
 
-	if ( async )
+	if ( async || g_bForceAsyncFlips )
 		flags |= DRM_MODE_PAGE_FLIP_ASYNC;
 
 	if ( needs_modeset ) {