Indivision GFX CLUT8 Palette....any ideas?

[NovaCoder]

I've been playing around with the new Indivision direct chunky mode and have found that the way you setup the palette is a little strange, anyone know what it's doing?

// Palette translation for Indivision GFX
UBYTE ptranslate[] =
{
 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,
 0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f,
 0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f,
 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,
 0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f,
 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f,
 0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f,
 0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,0x5f,
};

ULONG video_colourtable[1 + 3*256 + 1];

    // Indivision GFX uses 15bit palette
      for (i=0; i<128; i++)
      {
       video_colourtable[ptranslate[i]]=
        ( (((UBYTE)(palette[6*i+3]] & 0xf8) >> 3) |
        (((UBYTE)(palette[6*i+4]) & 0xf8) << 2) |
        (((UBYTE)(palette[6*i+5]) & 0xf8) << 7) |
        (((UBYTE)(palette[6*i+0]) & 0xf8) << 13) |
        (((UBYTE)(palette[6*i+1]) & 0xf8) << 18) |
        (((UBYTE)(palette[6*i+2]) & 0xf8) << 23) );
      }

I think it's creating 128 32bit words with each 32bit word represents 2 15bit palette entries.

I think the format for each 32 word is: [red2, green2, blue2, red1, green1, blue1]


Where red1 is an 8 bit RGB value....


I've also attached the Indivision assembler file so you can see what it's doing with the palette values.



God only knows why it needs to use that 'ptranslate' array.