From e650eff100a6648173b09d084b4fc8908bc061f3 Mon Sep 17 00:00:00 2001
From: Denis Pauk <pauk.denis@gmail.com>
Date: Tue, 22 Mar 2022 22:49:13 +0200
Subject: [PATCH] soft: preshift values in lightmap

---
 src/client/refresh/soft/sw_image.c | 11 +++++++----
 src/client/refresh/soft/sw_main.c  |  2 +-
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/src/client/refresh/soft/sw_image.c b/src/client/refresh/soft/sw_image.c
index 4ac01b5b..3c37615d 100644
--- a/src/client/refresh/soft/sw_image.c
+++ b/src/client/refresh/soft/sw_image.c
@@ -363,10 +363,13 @@ R_ApplyLight(pixel_t pix, const light3_t light)
 	b_g = vid_lightmap[light_masked[1] + b_g];
 	b_b = vid_lightmap[light_masked[2] + b_b];
 
-	/* convert back to indexed color */
-	b_r = ( b_r >> 3 ) & 31;
-	b_g = ( b_g >> 2 ) & 63;
-	b_b = ( b_b >> 3 ) & 31;
+	/*
+	 * convert back to indexed color (value reshifted >> 2)
+	 * look to R_Convert32To8bit
+	 */
+	b_r = ( b_r >> 1 ); // & 31;
+	b_g = ( b_g >> 0 ); // & 63;
+	b_b = ( b_b >> 1 ); // & 31;
 
 	i_c = b_r | ( b_g << 5 ) | ( b_b << 11 );
 
diff --git a/src/client/refresh/soft/sw_main.c b/src/client/refresh/soft/sw_main.c
index 6008754e..1ce75dd3 100644
--- a/src/client/refresh/soft/sw_main.c
+++ b/src/client/refresh/soft/sw_main.c
@@ -1811,7 +1811,7 @@ Draw_GetPalette (void)
 			vid_lightthreshold = i * 256;
 
 		for(j=0; j < 256; j++)
-			vid_lightmap[i * 256 + j] = (j * scale) / 255;
+			vid_lightmap[i * 256 + j] = ((j * scale / 255) >> 2) & 63;
 	}
 }