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User:Buddha^/GSoC2007-ProjectDiary (view source)
Revision as of 09:46, 31 July 2007
, 09:46, 31 July 2007Added info on done work on 2007-07-30.
(Added info on done work on 2007-07-28 and 2007-07-29.) |
(Added info on done work on 2007-07-30.) |
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* Header offset 51 | * Header offset 51 | ||
** Unknown function, uses values 0, 1, 2, 7 | ** Unknown function, uses values 0, 1, 2, 7 | ||
== 2007-07-30 (Monday) - Locating Apple IIGS instruments and Atari ST and Apple IIGS palettes == | |||
Played with [http://hte.sourceforge.net/ HT Editor] to find out where the instrument | |||
data is in different Apple IIGS AGI games. Found out the offsets into the games' executables | |||
but haven't yet compared the instrument data between games to see how much of it is shared data. | |||
Also looked into the SIERRASTANDARD-file that comes with Apple IIGS AGI games. | |||
It's a 65536 bytes long file containing raw unsigned 8-bit mono PCM-audio data. | |||
Its identical between all the Apple IIGS AGI games I've tested, excluding Space | |||
Quest I (It has a couple of different sounds). | |||
As I was going through the Apple IIGS AGI executables in search for the instrument data | |||
I also though why not look for the palette data as well. Tried out a couple of possibilities | |||
and finally found the palette with the search key (0xBB, 0x0B). As I had looked up from | |||
Wikipedia that Apple IIGS used a 4096 (12-bit) palette it helped to narrow down the | |||
search possibilities. Bytes 0xBB, 0x0B define an AGI palette color 7, which is gray. | |||
So I looked through all the Apple IIGS game data I had for different palettes and compared | |||
them. | |||
According to the data I have compared there are two different Apple IIGS AGI palettes. | |||
The first one is older and is only used in Space Quest I (AGI version 1.002) and it | |||
is identical to the oldest generation [[User:Buddha%5E/GSoC2007-ProjectDiary#The_three_generations_of_Amiga_AGI_palettes | Amiga AGI palette]]. | |||
All other games (AGI versions 1.003 - 3.003) use a slightly different palette that's otherwise | |||
identical to the first one but has a different color 13. Older palette uses an orange 0xF70 | |||
(12-bit RGB) there but all others use a light purple 0xD9F. | |||
Just for the kicks I also looked through Atari ST AGI executables for palette data. | |||
Wikipedia helped here again as it told me that the original Atari ST had a 64-color | |||
palette. So after some searching I found the palette data. Extracted palettes from | |||
all the Atari ST AGI executables I had access to and compared the data. I only | |||
found a single identical palette shared between all of the Atari ST AGI games. | |||
Here it is: | |||
<pre> | |||
/** | |||
* Atari ST AGI palette. | |||
* Used by all of the tested Atari ST AGI games. | |||
* 16 RGB colors. 3 bits per color component. | |||
*/ | |||
static const byte atariStAgiPalette[16 * 3] = { | |||
0x0, 0x0, 0x0, | |||
0x0, 0x0, 0x7, | |||
0x0, 0x4, 0x0, | |||
0x0, 0x5, 0x4, | |||
0x5, 0x0, 0x0, | |||
0x5, 0x3, 0x6, | |||
0x4, 0x3, 0x0, | |||
0x5, 0x5, 0x5, | |||
0x3, 0x3, 0x2, | |||
0x0, 0x5, 0x7, | |||
0x0, 0x6, 0x0, | |||
0x0, 0x7, 0x6, | |||
0x7, 0x2, 0x3, | |||
0x7, 0x4, 0x7, | |||
0x7, 0x7, 0x4, | |||
0x7, 0x7, 0x7 | |||
}; | |||
</pre> | |||