tc100scn.c

著名ARC模拟器源码,包括多个平台

/******************************************************************************/
/*                                                                            */
/*             tc0100scn: TAITO SCREEN LAYER CHIP (BG0/BG1/FG0)               */
/*                                                                            */
/******************************************************************************/

#include "gameinc.h"
#include "tc100scn.h"

extern int layer_id_data[MAX_CHIP][3];

/*

SCREEN RAM
----------

----------+-----------------------------
 Range    | Use
----------+-----------------------------
0000-3FFF | BG0 Layer [512x512x8: 4 bytes]
4000-5FFF | FG0 Layer [512x512x8: 2 bytes]
6000-7FFF | FG0 GFX
8000-BFFF | BG1 Layer [512x512x8: 4 bytes]
C000-C7FF | Line-Line Scroll? (AquaJack)
E000-E0FF | ? (AquaJack)
----------+-----------------------------

SCROLL RAM
----------

-----+--------+-------------------------
Byte | Bit(s) | Use
-----[phone]+-------------------------
  0  |.......x| BG0 Scroll X
  1  |xxxxxxxx| BG0 Scroll X
  2  |.......x| BG1 Scroll X
  3  |xxxxxxxx| BG1 Scroll X
  4  |.......x| FG0 Scroll X
  5  |xxxxxxxx| FG0 Scroll X
  6  |.......x| BG0 Scroll Y
  7  |xxxxxxxx| BG0 Scroll Y
  8  |.......x| BG1 Scroll Y
  9  |xxxxxxxx| BG1 Scroll Y
  A  |.......x| FG0 Scroll Y
  B  |xxxxxxxx| FG0 Scroll Y
  D  |.......x| BG0 Disable
  D  |......x.| BG1 Disable
  D  |.....x..| FG0 Disable
  D  |....x...| Swap BG0:BG1
  F  |.......x| Screen Flip
  F  |..x.....| Priority for 2 chips?
-----+--------+-------------------------

Not implemented:

- FG0 seems to be offset differently in some games.
- The variable stuff is slower, unless it can use self
  modifying code, so need to convert to asm.
- Need to add support for different screen orientations
  (screen flip Y-Axis, screen rotate 90 degrees).
- Line-line scroll is used occasionally (Chase HQ).
- FG0 gfx mask is missing (might be faster, might not make
  much difference).

Direct Mapped Games:

Bonze Adventure/Jigoku	- OK
Cadash/Cadash Italian	- OK (title screen might use line-line scroll)
Mega Blast		- OK
Camel Try		- OK (only need FG0)
Growl			- OK (fg0 is different offset in test mode)
Ninja Kids		- OK
Thunder Fox		- OK (priorities between dual tc0100scn and sprites wrong)
Operation Wolf		- OK (Old/Split scroll ram)
Rastan			- ? (Old/Split scroll ram)
Rainbow Islands		- ? (Old/Split scroll ram)

Mapped Games:

Final Blow		- OK
Chase HQ		- OK (uses line-line scroll)
Pulirula		- OK
AquaJack		- OK
Dino Rex		- OK
Night Striker		- OK (uses line-line scroll)
Chase HQ 2		- ?
Continental Circus	- ?

Mapped rotate 270