tc200obj.c

十七种模拟器源代码 非常有用的作课程设计不可缺少的

/******************************************************************************/
/*                                                                            */
/*              tc0200obj: TAITO OBJECT LAYER CHIP (F2-SYSTEM)                */
/*                                                                            */
/******************************************************************************/

#include "gameinc.h"
#include "tc200obj.h"

/*

This chip mainly exists in F2-System games.
It seems to behave slightly differently in most games (banking methods,
disable methods, offset methods). Horrible.

OBJECT RAM
----------

- 16 bytes/sprite
- 1024 sprites (0x4000 bytes)

-----+--------+-----------------------------------------------------------------
Byte | Bit(s) | Use
-----[phone]+-----------------------------------------------------------------
  0  |xxxxxxxx| Sprite Tile (high)
  1  |xxxxxxxx| Sprite Tile (low)
  2  |xxxxxxxx| Zoom Y
  3  |xxxxxxxx| Zoom X
  4  |.x......| Add Relative X and Y offsets [Final Blow]
  4  |.x......| Reset Relative X and Y offsets to 0 [Liquid Kids/Don Doko Don]
  4  |....xxxx| Sprite X (high)
  5  |xxxxxxxx| Sprite X (low)
  6  |x.......| Disable/Enable Sprites [Gun Frontier/Metal Black/Football Champ/Dead Connection]
  6  |....xxxx| Sprite Y (high)
  7  |xxxxxxxx| Sprite Y (low)
  8  |.....x..| Update Colour Bank and Zoom X/Y registers
  8  |......x.| Flip X Axis
  8  |.......x| Flip Y Axis
  9  |xxxxxxxx| Colour Bank
  A  |x.......| Jump to sprite Flag [Darius Gaiden]
  A  |....x...| Jump to sprite Bank A/B [Darius Gaiden]
  A  |......xx| Jump to sprite Number (high) [Darius Gaiden]
  B  |xxxxxxxx| Jump to sprite Number (low) [Darius Gaiden]
  B  |.......x| Last Sprite Marker
  D  |.......x| Last Sprite Marker (alt)
-----+--------+-----------------------------------------------------------------

Zoom:

00 = Full Size (16 sprites would span 256 pixels)
FF = Min Size  (16 sprites would span 1 pixel)

Direct Mapped Games:

Mega Blast              - OK
Thunder Fox             - OK
Camel Try               - OK [Colour Based Priorities]

Mapped 64 Colour Games:

Final Blow              - OK

Direct Mapped Rotate 180