From fc73893f3c314029abf285c9d0147f84cffb3a19 Mon Sep 17 00:00:00 2001
From: Matt Borgerson <contact@mborgerson.com>
Date: Wed, 3 Mar 2021 17:10:30 -0700
Subject: [PATCH] nv2a: Fix clip range scaling precision loss

---
 hw/xbox/nv2a/vsh.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/xbox/nv2a/vsh.c b/hw/xbox/nv2a/vsh.c
index ec71a713e4..8b527ad8ba 100644
--- a/hw/xbox/nv2a/vsh.c
+++ b/hw/xbox/nv2a/vsh.c
@@ -774,7 +774,7 @@ void vsh_translate(uint16_t version,
          * on OS X.
          */
         "  if (clipRange.y != clipRange.x) {\n"
-        "    oPos.z = (oPos.z - 0.5 * (clipRange.x + clipRange.y)) / (0.5 * (clipRange.y - clipRange.x));\n"
+        "    oPos.z = (oPos.z - clipRange.x)/(0.5*(clipRange.y - clipRange.x)) - 1;\n"
         "  }\n"
 
         /* Correct for the perspective divide */