From 549c1dbfcc034554c2114d37134bac935c453846 Mon Sep 17 00:00:00 2001
From: Eric Wasylishen <ewasylishen@gmail.com>
Date: Sun, 16 Jan 2022 20:42:25 -0700
Subject: [PATCH] vis: use ClusterFlow in all cases

---
 vis/vis.cc | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/vis/vis.cc b/vis/vis.cc
index 48432f7d..7bf77668 100644
--- a/vis/vis.cc
+++ b/vis/vis.cc
@@ -686,7 +686,7 @@ void CalcVis(mbsp_t *bsp)
     //
     // assemble the leaf vis lists by oring and compressing the portal lists
     //
-    if (portalleafs == portalleafs_real && bsp->loadversion->game->id != GAME_QUAKE_II) {
+    if (0 && portalleafs == portalleafs_real && bsp->loadversion->game->id != GAME_QUAKE_II) {
         // Legacy, non-detail Q1 vis codepath
         // FIXME: Should be possible to remove this and just use ClusterFlow even on Q1 maps
         // with no detail.
@@ -868,6 +868,11 @@ static void LoadPortals(const std::filesystem::path &name, mbsp_t *bsp)
 
     // No clusters
     if (portalleafs == portalleafs_real) {
+        // e.g. Quake 1, PRT1 (no func_detail).
+        // Assign the identity cluster numbers for consistency
+        for (i = 0; i < portalleafs; i++) {
+            bsp->dleafs[i + 1].cluster = i;
+        }
         return;
     }