From 034cd4ed62d15ab8eedfb702ea6adcca04f51983 Mon Sep 17 00:00:00 2001
From: jacksonmj <mj-pt@jacksonmj.co.uk>
Date: Wed, 19 Oct 2011 02:04:31 +0800
Subject: [PATCH] FILT subtracts photon colours when tmp=3

---
 src/powder.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/powder.c b/src/powder.c
index 1851f45a7..bb91cd342 100644
--- a/src/powder.c
+++ b/src/powder.c
@@ -277,6 +277,8 @@ int try_move(int i, int x, int y, int nx, int ny)
 				parts[i].ctype &= 0x1F << temp_bin; //Filter Colour
 			} else if(parts[r>>8].tmp==2){
 				parts[i].ctype |= 0x1F << temp_bin; //Add Colour
+			} else if(parts[r>>8].tmp==3){
+				parts[i].ctype &= ~(0x1F << temp_bin); //Subtract Colour
 			}
 		}
 		if (parts[i].type == PT_NEUT && (r&0xFF)==PT_GLAS) {