diff options
Diffstat (limited to 'src/mame/video/mjkjidai.c')
-rw-r--r-- | src/mame/video/mjkjidai.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/src/mame/video/mjkjidai.c b/src/mame/video/mjkjidai.c new file mode 100644 index 00000000000..c279586d94c --- /dev/null +++ b/src/mame/video/mjkjidai.c @@ -0,0 +1,141 @@ +#include "driver.h" + + +UINT8 *mjkjidai_videoram; + +static int display_enable; +static tilemap *bg_tilemap; + + + +/*************************************************************************** + + Callbacks for the TileMap code + +***************************************************************************/ + +static TILE_GET_INFO( get_tile_info ) +{ + int attr = mjkjidai_videoram[tile_index + 0x800]; + int code = mjkjidai_videoram[tile_index] + ((attr & 0x1f) << 8); + int color = mjkjidai_videoram[tile_index + 0x1000]; + SET_TILE_INFO(0,code,color >> 3,0); +} + + + +/*************************************************************************** + + Start the video hardware emulation. + +***************************************************************************/ + +VIDEO_START( mjkjidai ) +{ + bg_tilemap = tilemap_create(get_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN,8,8,64,32); +} + + + +/*************************************************************************** + + Memory handlers + +***************************************************************************/ + +WRITE8_HANDLER( mjkjidai_videoram_w ) +{ + mjkjidai_videoram[offset] = data; + tilemap_mark_tile_dirty(bg_tilemap,offset & 0x7ff); +} + +WRITE8_HANDLER( mjkjidai_ctrl_w ) +{ + UINT8 *rom = memory_region(REGION_CPU1); + +// logerror("%04x: port c0 = %02x\n",activecpu_get_pc(),data); + + /* bit 0 = NMI enable */ + interrupt_enable_w(0,data & 1); + + /* bit 1 = flip screen */ + flip_screen_set(data & 0x02); + + /* bit 2 =display enable */ + display_enable = data & 0x04; + + /* bit 5 = coin counter */ + coin_counter_w(0,data & 0x20); + + /* bits 6-7 select ROM bank */ + if (data & 0xc0) + { + memory_set_bankptr(1,rom + 0x10000-0x4000 + ((data & 0xc0) << 8)); + } + else + { + /* there is code flowing from 7fff to this bank so they have to be contiguous in memory */ + memory_set_bankptr(1,rom + 0x08000); + } +} + + + +/*************************************************************************** + + Display refresh + +***************************************************************************/ + +static void draw_sprites(running_machine *machine, mame_bitmap *bitmap,const rectangle *cliprect) +{ + int offs; + + for (offs = 0x20-2;offs >= 0;offs -= 2) + { + int code = spriteram[offs] + ((spriteram_2[offs] & 0x1f) << 8); + int color = (spriteram_3[offs] & 0x78) >> 3; + int sx = 2*spriteram_2[offs+1]; + int sy = 240 - spriteram[offs+1]; + int flipx = code & 1; + int flipy = code & 2; + + code >>= 2; + + sx += (spriteram_2[offs] & 0x20) >> 5; // not sure about this + + if (flip_screen) + { + sx = 496 - sx; + sy = 240 - sy; + flipx = !flipx; + flipy = !flipy; + } + + sx += 16; + sy += 1; + + drawgfx(bitmap,machine->gfx[1], + code, + color, + flipx,flipy, + sx,sy, + cliprect,TRANSPARENCY_PEN,0); + } +} + + + +VIDEO_UPDATE( mjkjidai ) +{ + if (!display_enable) + { + fillbitmap(bitmap,get_black_pen(machine),cliprect); + } + else + { + tilemap_draw(bitmap,cliprect,bg_tilemap,0,0); + draw_sprites(machine, bitmap,cliprect); + } + return 0; +} |