gbadev : Message: RE: [gbadev] how to use 2 char block on the same bg?!?

gbadev

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how to use 2 char block on the same bg?!?

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Message #12621 of 15019 |

RE: [gbadev] how to use 2 char block on the same bg?!?

>I really see no point to this as you can access the entire video ram by
>setting your base block to zero. Since tile numbers are 0-1023 that's
>all 64KB of memory.
[...]

That's only valid with 256 color backgrounds.
You can access only 32KB of video memory with 10 bits indexes in 16 colors.

Fri Sep 6, 2002 10:24 am

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Omar Cornut <cornut@...>

segamastersy...

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Message #12621 of 15019 |

Expand Messages	Author	Sort by Date
I want to set up bg 2 in mode 1 to create a scrollable background. The bg is made from a complete image so there is no tile repetion and it is divided it in...	Marco xinn_it	Sep 4, 2002 3:00 pm
... You can fit 256 8-bit tiles or 512 4-bit tiles into a 16 KB bank. If you have more than 256 tiles, just use tile numbers greater than 255. If a tile...	yerricde	Sep 4, 2002 3:48 pm
you would need to use a hblank to change the char base block value at the correct position down the screen. either that or use two layers and have the first...	ninge n1nge	Sep 4, 2002 3:49 pm
... No, that was the NES, with a hard limit of 256 different tile indices. Some games stretched their title screens over four 4 KB tile banks to cover all 960...	yerricde	Sep 4, 2002 7:03 pm
yeah, got a bit confused as to what he was asking about there! the example I was giving was for a 360 * 240 map which was using 1350 unique 16 colour chars (it...	ninge n1nge	Sep 5, 2002 9:47 am
... the correct position down >the screen. either that or use two layers and have the first set to the first char block (showing >the top half) and the second...	JASON jason_lee_ro...	Sep 5, 2002 10:32 pm
er - you are incorrect.. 1 16 colour char is 32 bytes not 64 so you can actually only access half of video ram (32 * 1024 = 32768 bytes or 32k) in 16 colour...	Neil Holmes n1nge	Sep 6, 2002 10:52 am
... [...] That's only valid with 256 color backgrounds. You can access only 32KB of video memory with 10 bits indexes in 16 colors....	Omar Cornut segamastersy...	Sep 6, 2002 10:52 am

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