Fix SCCAN2 sprite with zero X-coordinate

diff --git a/custom.cpp b/custom.cpp
index 37f26e49add5aa763648e8aeec100f530e9442ce..5e3fef1c625f6cb5d41abecc5e802a6afbd0d011 100644 (file)
--- a/custom.cpp
+++ b/custom.cpp
@@ -4361,7 +4361,8 @@ static void decide_sprites(int hpos, bool usepointx, bool quick)
                int hw_xp = sprxp >> sprite_buffer_res;
                int pointx = usepointx && (s->ctl & sprite_sprctlmask) ? 0 : 1;
 
-               if (hw_xp <= 0 || hw_xp > maxhpos * 2 + 1) {
+               // Sprite does not start if X=0 but SSCAN2 sprite does. Don't do X == 0 check here.
+               if (sprxp < 0 || hw_xp > maxhpos * 2 + 1) {
                        continue;
                }
 
@@ -4379,7 +4380,7 @@ static void decide_sprites(int hpos, bool usepointx, bool quick)
                        hw_xp = sprxp >> sprite_buffer_res;
                }
 
-               if (hw_xp > last_sprite_point && hw_xp <= point + pointx) {
+               if (hw_xp > 0 && hw_xp > last_sprite_point && hw_xp <= point + pointx) {
                        add_sprite(&count, i, sprxp, posns, nrs);
                }