====== Textures ======
All of the Blast Corps textures are compressed inside of the ROM using either gzip or one of 6 custom compression schemes.

===== Texture Table =====
The texture table stores information about each of the textures used in the display lists. The table is located between offsets 0x4CE0-0xCCE0 in the ROM. Each entry is 8 bytes and stores the texture offset (relative to the table base), the compressed length, and the texture type.

===== Texture Type 0 =====
Texture type 0 is uncompressed and just memcpy's the data from ROM.

===== Texture Type 1 =====
Type 1 textures use 16-bit data with lookback to compress RGBA16.
^  15  ^  14-10  ^  9 - 6  ^  5 - 1  ^  0  ^
|   0  |   Red   |  Green  |  Blue   | A |

^  15  ^      14 - 5      ^     4 - 0     ^
|  1  |  Offset (bytes)  |  Length (16)  |

   if MSB is 0:
     DataOut = ((DataIn & 0xFFC0) << 1) | (DataIn & 0x3F);
     this implies that the 7th bit (lsb of green) is always 0
   if MSB is 1: copy 'length' 16-bit values from -offset
      length16 = DataIn & 0x1F;
      offset8  = (DataIn & 0x7FFF) >> 5;

===== Texture Type 2 =====
Type 2 textures use 32-bit data with lookback to compress RGBA32.
^  15  ^  14-11  ^  10- 7  ^  6 - 3  ^  2 - 0  ^
|  0   |   Red   |  Green  |  Blue   |  Alpha  |  

^  15  ^     14 - 5    ^     4 - 0     ^
|   1  |  Offset (16)  |  Length (32)  |

   if MSB is 0:
     DataOut = ((DataIn & 0x7800) << 17) | ((DataIn & 0x780) << 13) | 
               ((DataIn & 0x78) << 9)    | ((DataIn & 0x7) << 5);
     Implies that four LSBs of R,G,B are 0, five LSBs of A are 0
   if MSB is 1: copy 'length' 32-bit values from -offset
      length32 = DataIn & 0x1F;
      offset16 = (DataIn & 0x7FE0) >> 4;

===== Texture Type 3 =====
Type 3 textures use 16-bit data with lookback to compress IA16.

^  15  ^  14 - 8  ^  7  ^    6 - 0    ^
|   0  |  Alpha   |  X  |  Intensity  |

^  15  ^      14 - 5      ^     4 - 0     ^
|  1   |  Offset (bytes)  |  Length (16)  |

   if MSB is 0:
     ByteOut0 = ((DataIn >> 8) << 1);
     ByteOut1 = ((DataIn) & 0xFF) << 1);
     Implies that the LSBs I and A are 0
   if MSB is 1: copy 'length' 16-bit values from -offset
      length16 = DataIn & 0x1F;
      offset8  = (DataIn & 0x7FFF) >> 5;

===== Texture Type 4 =====
Type 4 textures use 16-bit data to reference a 16-bit lookup table and 32-bit lookback - used for explosions? RGBA32?

^  15  ^  14 - 9   ^   8   ^   7 - 1   ^   0   ^
|   0  |  Offset1  |  LB1  |  Offset2  |  LB2  |

^  15  ^     14 - 5    ^     4 - 0     ^
|   1  |  Offset (16)  |  Length (32)  |

   LUT passed through T4, assigned from a0->0xC in 802A57DC(), set from FP
   if MSB is 0:
     U16Out1 = (LUT[((DataIn >> 8) & 0xFE)] << 1) | ((DataIn >> 8) & 0x1);
     U16Out2 = (LUT[(DataIn & 0xFE)] << 1) | (DataIn& 0x1);
   if MSB is 1: copy 'length' 32-bit values from -offset
      length32 = DataIn & 0x1F;
      offset16 = (DataIn & 0x7FE0) >> 4;

===== Texture Type 5 =====
Type 5 textures use 16-bit data with a 32-bit lookup table and lookback - maybe used for some text?

^  15  ^  14 - 4  ^  3 - 0  ^
|   0  |  Offset  |  LSBs   |

^  15  ^     14 - 5    ^     4 - 0     ^
|   1  |  Offset (16)  |  Length (32)  |

   Similar to Type 4, T4 passed in as LUT
   if MSB is 0:
     Offset = (DataIn >> 4) << 1;
     Tmp16 = (LUT[Offset] << 1) | ((DataIn >> 8) & 0x1);
     U32Out = ((Tmp16 & 0x7C00) << 17) | ((Tmp16 & 0x3E0) << 14) | 
              ((Tmp16 & 0x1F) << 11) | ((DataIn & 0xF) << 4);
   if MSB is 1: copy 'length' 32-bit values from -offset
      length32 = DataIn & 0x1F;
      offset16 = (DataIn & 0x7FE0) >> 4;

===== Texture Type 6 =====
Type 6 textures are primarily used to compress IA8 fonts using 16-bit data with lookback.

^  15  ^  14  ^  13-11  ^  10-8  ^  7-6  ^  5-3  ^  2-0  ^
|  0   |  X   |   I1    |   A1   |   X   |  I2   |  A2   |

^  15  ^       14 - 5     ^     4 - 0     ^
|   1  |  Offset (bytes)  |  Length (16)  |

   if MSB is 0:
     ByteOut0 = (((DataIn >> 8) & 0x38) << 2) | (((DataIn >> 8) & 0x7) << 1);
     ByteOut1 = ((DataIn & 0x38) << 2) | ((DataIn & 0x7) << 1);
     Implies that the LSBs I and A are 0
   if MSB is 1: copy 'length' 16-bit values from -offset
      length = DataIn & 0x1F;
      offset = (DataIn & 0x7FFF) >> 5;