CLXDAT bit 0 special case fix.

diff --git a/drawing.cpp b/drawing.cpp
index e98190807f3bd294205b640f112782ca62af9ae2..f4176a17f6f9446c9699388f8d5ac629d21dce25 100644 (file)
--- a/drawing.cpp
+++ b/drawing.cpp
@@ -3222,12 +3222,13 @@ static void expand_colmask(void)
                clxcon_bpl_enable2 = 0;
                clxcon_bpl_match2 = 0;
        }
+       bool bplalwayson = currprefs.collision_level >= 3 && clxcon_bpl_enable2 == 0;
        if (clxcon_bpl_enable_o != clxcon_bpl_enable2 || clxcon_bpl_match_o != clxcon_bpl_match2) {
                for (int i = 0; i < (aga_mode ? 256 : 64); i++) {
                        uae_u8 m = i & clxcon_bpl_enable;
                        uae_u8 odd = m & 0x55;
                        uae_u8 even = m & 0xaa;
-                       if ((odd && even) && m == (clxcon_bpl_enable2 & clxcon_bpl_match2)) {
+                       if (((odd && even) && m == (clxcon_bpl_enable2 & clxcon_bpl_match2)) || bplalwayson) {
                                bplcoltable[i] = 0x0001;
                        } else {
                                bplcoltable[i] = 0x0000;