#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;
}