Gameboy Development Forum

Crona · 2014-10-08 08:52:52

This peice of code glitches out just before the printf

set_bkg_data(0,256,SpaceKittyGamesLogo_tiledata);
set_bkg_tiles(0,0,20,18,SpaceKittyGamesLogo_tilemap);
SHOW_BKG;
delay(3000);
HIDE_BKG;
printf(" \n\n\n PEW PEW\n\n\n\n\n (PRESS START)\n\n\n\n\n MadeBy:\nIsaac Tschampl\n Website:\nSpaceKittyGames.com");
waitpad(J_START);
waitpadup();

Is there something I am clearly doing wrong here that I just cant figure out? It works totally fine on an emulator (you can try for yourself if you want here is the rom)

Last edited by Crona (2014-10-08 08:53:10)

Crona · 2014-10-08 09:03:23

Like it shows the first splash screen thing waits 3 seconds, and then the tiles spaz out and the screen goes blank.

Last edited by Crona (2014-10-08 09:11:06)

a cat · 2014-10-08 10:41:08

i think you need to turn the display on and off
try this:

set_bkg_data(0,256,SpaceKittyGamesLogo_tiledata);
set_bkg_tiles(0,0,20,18,SpaceKittyGamesLogo_tilemap);
SHOW_BKG

DISPLAY_ON;

delay(3000);
HIDE_BKG;
DISPLAY_OFF;

printf(" \n\n\n PEW PEW\n\n\n\n\n (PRESS START)\n\n\n\n\n MadeBy:\nIsaac Tschampl\n Website:\nSpaceKittyGames.com");
waitpad(J_START);
waitpadup();

Crona · 2014-10-08 11:34:08

It still glitches out with that. I remember hearing or reading in some tutorial doing a printf while graphics are active is a no-no, but there has to be a way to do it. I would just make the printf into a separate background, but I don't think there is enough space left.

Crona · 2014-10-08 12:42:43

I tried making it into a background and it did the same thing.

Whats weird is that in an older version of the code I go from bkg to a printf no problem. The only difference is that the new code has const in front of the tiles.

______________________________________________________________________________________________________

Thats what the problem was, apparently you cant change background data if its a const and printf occupies the background layer.

Last edited by Crona (2014-10-08 14:49:16)

andreai · 2014-10-27 02:20:24

Hey Crona, try using wait_vbl_done() before and after setting background tiles or when inside an interrupt.

Crona · 2014-10-27 11:10:39

I am a little confused about how vbl works, from what I understand it lets you run code in the time right before the screen draws. But wouldn't wait_vbl_done() make it run while the screen is drawing?

andreai · 2014-10-29 15:16:06

using wait_vbl_done() you just make sure the processor is done drawing the screen before you do anything new.

nitro2k01 · 2014-10-29 16:43:26

Be sure to use BGB for debugging. It is both an accurate emulator and a well equipped debugger.

http://bgb.bircd.org/

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#1 2014-10-08 08:52:52

Tiles glitch out when I play on a real Gameboy but not on emulator.

#2 2014-10-08 09:03:23

Re: Tiles glitch out when I play on a real Gameboy but not on emulator.

#3 2014-10-08 10:41:08

Re: Tiles glitch out when I play on a real Gameboy but not on emulator.

#4 2014-10-08 11:34:08

Re: Tiles glitch out when I play on a real Gameboy but not on emulator.

#5 2014-10-08 12:42:43

Re: Tiles glitch out when I play on a real Gameboy but not on emulator.

#6 2014-10-27 02:20:24

Re: Tiles glitch out when I play on a real Gameboy but not on emulator.

#7 2014-10-27 11:10:39

Re: Tiles glitch out when I play on a real Gameboy but not on emulator.

#8 2014-10-29 15:16:06

Re: Tiles glitch out when I play on a real Gameboy but not on emulator.

#9 2014-10-29 16:43:26

Re: Tiles glitch out when I play on a real Gameboy but not on emulator.

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