Anybody have any insight into why the jump spring platform in Super Mario Bros is sometimes rendered backwards and sometimes forwards?  Normally it doesn't matter because the default object is symmetrical but if you change the tiles then it's quite noticeable.  There is a specific section of code which handles the flipping for the block but disabling the flipping there doesn't prevent the tiles from being flipped somewhere else  :banghead:


disabling the flipping there doesn't stop the flipping elsewhere   the tiles are already drawn at that point, sometimes forwards sometimes backwards.




[edit:  i see why.. the object doesn't set an sprite direction so it just uses the value that was there.  grrrr]

[edit2: and never mind i 'solved' it or at least kludged/hacked it to make it stop flipping..


changing ldy #$03   to sty $03 will make it stop flipping.  Y is always 00 and $03 is a temporary variable for the sprite direction.  since you're not loading #03 into Y the top left tile will no longer be flipped either but whatever that just makes it cleaner in the CHR-ROM.  If you disable the rest of the flipping in the code I first quoted you can put the tiles in the CHR-ROM exactly how they appear in the game, not all flipped around and stuff.