Color palette display help

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Main - ROM Hacking - Color palette display help

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Stifu

Posted on 03-23-07 10:28 PM

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Sooo... I'd like to display SNES color palettes in my editor (coded in C++). Any tips ?
I know colors are defined by 2 bytes, so 4 figures... The first figure could be the alpha channel, while the 3 others are the RGB ones, or something ?
Can anyone direct me to some documentation, or program sources ? I'm currently having a look at the sources of Tile Molester, but there may be something better for me to look at...

Thanks.

Kawa

Posted on 03-23-07 10:45 PM (rev. 2 of 03-23-07 10:45 PM)

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1 bit wasted, 5 blue, 5 green, 5 red.
In that order.

0x0000 black, 0x7FFF white.

Same format as DS, GBA, GBC and SGB.

Fun fact: 0xFFFF is also white but the last bit is ignored so yeah.

Edit: Best I have is a VB6 program I made.

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Stifu

Posted on 03-24-07 09:17 AM

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I'm still confused... 1+5+5+5 = 16, so that's just one byte out of 4 then ?

Got other examples other than black and white ? Thanks...

Sukasa

Posted on 03-24-07 09:39 AM (rev. 2 of 03-24-07 09:40 AM)

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The bits are like this x b b b b b g g | g g g r r r r r

(High Byte | Low Byte)

x - Unused
b - blue
g - green
r - red

Stifu

Posted on 03-24-07 09:58 AM (rev. 2 of 03-24-07 10:02 AM)

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Ah okay, I get it better...
Although I have no idea how to handle colors if they are shared like that. For example, the 3rd figure is 3g and 1r... How do you deal with that ? So changing that figure will affect both the green and the red ?
Or maybe I should just not set my editor to hex mode, but to another one that'd display 16 figures rather than 4 ?

I need to study that more...

Kawa

Posted on 03-24-07 10:25 AM

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Bit shifting, masking and scaling.

Where you'd convert a Windows-style 24/32-bit color by masking out complete bytes, you'd mask out a SNES-style 15-bit color by masking out only the right bits.

Here's the VB code I used to convert 15 to 24 bits:



snesR = snesColor And &H1F

snesG = (snesColor / 32) And &H1F

snesB = (snesColor / 1024) And &H1F

winColor = RGB(snesR * 8.3, snesG * 8.3 snesB * 8.3)

All magic is hand-calculated because VB Classic does not have bitshifting ops. Normally, you'd do bitshifts instead of / and * but that's pretty much the only difference. The 8.3 is only to make sure 0x1F really does become 0xFF.

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Stifu

Posted on 03-24-07 11:39 AM

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Thank you.
I assume that in "snesColor", you have the data of the color palettes...
But what's in &H1F ?

I've never done anything like that, but your code looks short and simple enough (although I don't quite get it yet), so hopefully I'll get it right soon.

Kawa

Posted on 03-24-07 11:47 AM (rev. 2 of 03-24-07 11:49 AM)

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&H is VB's 0x and its bit pattern is 00011111b.

Basically, I cut out 11111111111111100000 by anding snesColor with 0x1F. That's one. For the rest, I shift out the first five/ten bits before anding.

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Keitaro

Posted on 03-24-07 07:24 PM

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Another thing you could always do is enter the RGB values in to something like TLP, then save the pallet to a file. Hex edit it, and ignore the first four bytes (those are a header of sorts for the pallet file) and you have your pallet, stored in whatever format you were working with.

dirtbag

Posted on 03-24-07 10:18 PM

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Posted by Keitaro
Another thing you could always do is enter the RGB values in to something like TLP, then save the pallet to a file. Hex edit it, and ignore the first four bytes (those are a header of sorts for the pallet file) and you have your pallet, stored in whatever format you were working with.

The problem with that is that the pallet would not be worked out dynamically then. It would be working on the assumption that the ROM contains the default colour pallet.

Stifu

Posted on 03-24-07 10:57 PM

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Yeah, the whole point is to have something dynamic, else I could just display BMP pictures like Track Designer does...

Anyway, I'll work more on this later...

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