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04-25-24 04:30 AM |
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| Main - ROM Hacking - Question/Game Sprites... | New thread | New reply |
| RetroRain |
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 Fuzz Ball Level: 66 Posts: 32/994 EXP: 2437933 Next: 23918 Since: 09-30-07 Last post: 1933 days Last view: 956 days |
I was going to post this in my other thread, but I wanted to make sure this gets seen.
According to NESprgmn.txt, this is the routine for displaying a single 8x8 tile sprite: ldx #$00 ;set $2004 to the start of SPR-RAM stx $2003 stx $2003 lda #$7F ;y-1 sta $2004 lda #$00 ;sprite pattern number sta $2004 lda #%00000001 ;color bit sta $2004 lda #$08 ;x sta $2004 My question is, using Megaman 1 as an example, Megaman, standing still, consists of 9 tiles, right? Now, in Megaman's code, they didn't have to type the above code 9 times to get Megaman to show up? That would be insufficient, and a waste of code. So I guess what I'm asking is, would they use a table and a loop for every sprite they wanted to show on screen? Or is there another way of doing this? I just want to make sure, so I don't waste my time making code that I don't have to. ____________________ My YouTube Channel |
| kuja killer |
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Level: 55 Posts: 26/628 EXP: 1243749 Next: 70440 Since: 03-20-07 From: Lake Havasu City, Arizona Last post: 280 days Last view: 6 days |
Yea there's generally about 2 seperate types of data for constructing sprites.
Well i dont know about megaman 1 and 2 ... but 3, 4, and 5 follow the exact same format. There's a table for x/y positions And a table for tile id/pallete/flipping prioritys for every single gameplay sprite in the game (not including non-gameplay screens) I'm not going to go into detail how the coding side of the format works since that can get complicated, but it is looped though after a certain point. And run in a specific way to allow for sprite flicker handling so that sprites will flicker instead of being hidden all the time if there's more than 64 active sprites currently on the screen ..(or 8 per scanline) You wouldn't need to do any coding at all. Just editing the data tables only after you figured how to work it properly. |
| Main - ROM Hacking - Question/Game Sprites... | New thread | New reply |
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