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04-26-24 10:29 AM |
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| 0 users currently in ROM Hacking | 4 guests |
| Main - ROM Hacking - Mega Man 4 Hack - PPU Address | New thread | New reply |
| MartsINY |
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 Micro-Goomba Level: 11 Posts: 1/17 EXP: 4843 Next: 1142 Since: 03-31-11 Last post: 2073 days Last view: 2073 days |
Hi!
I'm making a hack of Mega Man 4. I'm actually trying to load tile ine the PPU VRAM, and I'M succeding, by setting #$00 in $2001, and then writing my datas at 2006 and 2007. But the problem, is when #$00 is in 2001, after a certain number of cycle, parts of my screen become black. How can I prevent this? thx for your time |
| never-obsolete |
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 Rat Level: 24 Posts: 74/96 EXP: 74495 Next: 3630 Since: 02-22-07 From: Phoenix, AZ Last post: 2596 days Last view: 2596 days |
Writing #$00 to $2001 disables background and sprite rendering, so you have to add another write to turn them back on. Writing #$00 to $2001 midframe will cause portions of the screen not to be drawn. If you do all your writes to $2006/$2007 during VBlank, you don't need to write #$00 to $2001.
Also, here's a breakdown of what each bit of $2001 does. |
| MartsINY |
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Micro-Goomba Level: 11 Posts: 2/17 EXP: 4843 Next: 1142 Since: 03-31-11 Last post: 2073 days Last view: 2073 days |
thx a lot!
so I get it, because I do it midframe, my screen turn black, so I have to do it during VBlank. But to do it during VBlank, it makes a wait during the gameplay of my game... I don't understand VBlank 100% percent... but is there a way to call it? For example... I don't know if you know mega man 5.... but in this game, during gameplay, without loading time, tiles are update in the PPU. and what I don't get is how I can do it if I have to wait for VBlank? can I provoke it? thx again a lot for the answer, really helpful |
| never-obsolete |
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Rat Level: 24 Posts: 75/96 EXP: 74495 Next: 3630 Since: 02-22-07 From: Phoenix, AZ Last post: 2596 days Last view: 2596 days |
You can't call VBlank, because from the NES point of view, its just an interrupt that is synced to the tv.
You don't normally want to wait for vblank to write directly to VRAM because that will cause your game to slow down. You'd instead want to buffer the data so that it's written on the next VBlank. VBlank is not very long, so be careful you don't go over or you'll glitch the screen. |
| MartsINY |
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Micro-Goomba Level: 11 Posts: 3/17 EXP: 4843 Next: 1142 Since: 03-31-11 Last post: 2073 days Last view: 2073 days |
thx a lot for the answer, I was able to understand it and do what I had to do! |
| Main - ROM Hacking - Mega Man 4 Hack - PPU Address | New thread | New reply |
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