From 406900e253bfcaa4a8b70d394b6e6bc36918e244 Mon Sep 17 00:00:00 2001
From: fgsfds <derp.primus@gmail.com>
Date: Thu, 3 Aug 2023 16:50:24 +0200
Subject: [PATCH] port: detect fog color usage

---
 port/fast3d/gfx_pc.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/port/fast3d/gfx_pc.cpp b/port/fast3d/gfx_pc.cpp
index ed8104e76..37b153aa7 100644
--- a/port/fast3d/gfx_pc.cpp
+++ b/port/fast3d/gfx_pc.cpp
@@ -1114,7 +1114,8 @@ static void gfx_sp_vertex(size_t n_vertices, size_t dest_index, const Vtx* verti
         d->z = z;
         d->w = w;
 
-        if (rsp.geometry_mode & G_FOG) {
+        // seems like PD uses the fog color without setting G_FOG sometimes
+        if ((rsp.geometry_mode & G_FOG) || (rdp.other_mode_l >> 30) == G_BL_CLR_FOG) {
             if (fabsf(w) < 0.001f) {
                 // To avoid division by zero
                 w = 0.001f;