fixed bug with shifted global playfield animations during envelope requests

diff --git a/src/anim.c b/src/anim.c
index 9611fa67d2cbd4139aaba70cd6ebf0d8c8d4c4fd..4d67b458378eb27206df6d91bd7a12344a32edff 100644 (file)
--- a/src/anim.c
+++ b/src/anim.c
@@ -1732,10 +1732,13 @@ static int HandleGlobalAnim_Part(struct GlobalAnimPartControlInfo *part,
   if (c->position == POS_CE)
   {
     // calculate playfield position (with scrolling) for related CE tile
+    // (do not use FX/FY, which are incorrect during envelope requests)
+    int FX0 = 2 * TILEX_VAR;   // same as FX during DRAW_TO_FIELDBUFFER
+    int FY0 = 2 * TILEY_VAR;   // same as FY during DRAW_TO_FIELDBUFFER
     int fx = getFieldbufferOffsetX_RND(ScreenMovDir, ScreenGfxPos);
     int fy = getFieldbufferOffsetY_RND(ScreenMovDir, ScreenGfxPos);
-    int sx = FX + SCREENX(part->tile_x) * TILEX_VAR;
-    int sy = FY + SCREENY(part->tile_y) * TILEY_VAR;
+    int sx = FX0 + SCREENX(part->tile_x) * TILEX_VAR;
+    int sy = FY0 + SCREENY(part->tile_y) * TILEY_VAR;
     int cx = SX - REAL_SX;
     int cy = SY - REAL_SY;
     int x = sx - fx + cx;