#include "emu.h"
#include "includes/mjkjidai.h"
/***************************************************************************
Callbacks for the TileMap code
***************************************************************************/
static TILE_GET_INFO( get_tile_info )
{
mjkjidai_state *state = machine.driver_data<mjkjidai_state>();
int attr = state->m_videoram[tile_index + 0x800];
int code = state->m_videoram[tile_index] + ((attr & 0x1f) << 8);
int color = state->m_videoram[tile_index + 0x1000];
SET_TILE_INFO(0,code,color >> 3,0);
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
VIDEO_START( mjkjidai )
{
mjkjidai_state *state = machine.driver_data<mjkjidai_state>();
state->m_bg_tilemap = tilemap_create(machine, get_tile_info,tilemap_scan_rows,8,8,64,32);
}
/***************************************************************************
Memory handlers
***************************************************************************/
WRITE8_HANDLER( mjkjidai_videoram_w )
{
mjkjidai_state *state = space->machine().driver_data<mjkjidai_state>();
state->m_videoram[offset] = data;
tilemap_mark_tile_dirty(state->m_bg_tilemap,offset & 0x7ff);
}
WRITE8_HANDLER( mjkjidai_ctrl_w )
{
mjkjidai_state *state = space->machine().driver_data<mjkjidai_state>();
UINT8 *rom = space->machine().region("maincpu")->base();
// logerror("%04x: port c0 = %02x\n",cpu_get_pc(&space->device()),data);
/* bit 0 = NMI enable */
interrupt_enable_w(space,0,data & 1);
/* bit 1 = flip screen */
flip_screen_set(space->machine(), data & 0x02);
/* bit 2 =display enable */
state->m_display_enable = data & 0x04;
/* bit 5 = coin counter */
coin_counter_w(space->machine(), 0,data & 0x20);
/* bits 6-7 select ROM bank */
if (data & 0xc0)
{
memory_set_bankptr(space->machine(), "bank1",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(space->machine(), "bank1",rom + 0x08000);
}
}
/***************************************************************************
Display refresh
***************************************************************************/
static void draw_sprites(running_machine &machine, bitmap_t *bitmap,const rectangle *cliprect)
{
mjkjidai_state *state = machine.driver_data<mjkjidai_state>();
UINT8 *spriteram = state->m_spriteram1;
UINT8 *spriteram_2 = state->m_spriteram2;
UINT8 *spriteram_3 = state->m_spriteram3;
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_get(machine))
{
sx = 496 - sx;
sy = 240 - sy;
flipx = !flipx;
flipy = !flipy;
}
sx += 16;
sy += 1;
drawgfx_transpen(bitmap,cliprect,machine.gfx[1],
code,
color,
flipx,flipy,
sx,sy,0);
}
}
SCREEN_UPDATE( mjkjidai )
{
mjkjidai_state *state = screen->machine().driver_data<mjkjidai_state>();
if (!state->m_display_enable)
bitmap_fill(bitmap,cliprect,get_black_pen(screen->machine()));
else
{
tilemap_draw(bitmap,cliprect,state->m_bg_tilemap,0,0);
draw_sprites(screen->machine(), bitmap,cliprect);
}
return 0;
}