/***************************************************************************
Atari Shuuz hardware
****************************************************************************/
#include "emu.h"
#include "video/atarimo.h"
#include "includes/shuuz.h"
/*************************************
*
* Tilemap callbacks
*
*************************************/
static TILE_GET_INFO( get_playfield_tile_info )
{
shuuz_state *state = machine.driver_data<shuuz_state>();
UINT16 data1 = state->m_playfield[tile_index];
UINT16 data2 = state->m_playfield_upper[tile_index] >> 8;
int code = data1 & 0x3fff;
int color = data2 & 0x0f;
SET_TILE_INFO(0, code, color, (data1 >> 15) & 1);
}
/*************************************
*
* Video system start
*
*************************************/
VIDEO_START( shuuz )
{
static const atarimo_desc modesc =
{
1, /* index to which gfx system */
1, /* number of motion object banks */
1, /* are the entries linked? */
0, /* are the entries split? */
0, /* render in reverse order? */
0, /* render in swapped X/Y order? */
0, /* does the neighbor bit affect the next object? */
8, /* pixels per SLIP entry (0 for no-slip) */
0, /* pixel offset for SLIPs */
0, /* maximum number of links to visit/scanline (0=all) */
0x000, /* base palette entry */
0x100, /* maximum number of colors */
0, /* transparent pen index */
{{ 0x00ff,0,0,0 }}, /* mask for the link */
{{ 0 }}, /* mask for the graphics bank */
{{ 0,0x7fff,0,0 }}, /* mask for the code index */
{{ 0 }}, /* mask for the upper code index */
{{ 0,0,0x000f,0 }}, /* mask for the color */
{{ 0,0,0xff80,0 }}, /* mask for the X position */
{{ 0,0,0,0xff80 }}, /* mask for the Y position */
{{ 0,0,0,0x0070 }}, /* mask for the width, in tiles*/
{{ 0,0,0,0x0007 }}, /* mask for the height, in tiles */
{{ 0,0x8000,0,0 }}, /* mask for the horizontal flip */
{{ 0 }}, /* mask for the vertical flip */
{{ 0 }}, /* mask for the priority */
{{ 0 }}, /* mask for the neighbor */
{{ 0 }}, /* mask for absolute coordinates */
{{ 0 }}, /* mask for the special value */
0, /* resulting value to indicate "special" */
0 /* callback routine for special entries */
};
shuuz_state *state = machine.driver_data<shuuz_state>();
/* initialize the playfield */
state->m_playfield_tilemap = tilemap_create(machine, get_playfield_tile_info, tilemap_scan_cols, 8,8, 64,64);
/* initialize the motion objects */
atarimo_init(machine, 0, &modesc);
}
/*************************************
*
* Main refresh
*
*************************************/
SCREEN_UPDATE( shuuz )
{
shuuz_state *state = screen->machine().driver_data<shuuz_state>();
atarimo_rect_list rectlist;
bitmap_t *mobitmap;
int x, y, r;
/* draw the playfield */
tilemap_draw(bitmap, cliprect, state->m_playfield_tilemap, 0, 0);
/* draw and merge the MO */
mobitmap = atarimo_render(0, cliprect, &rectlist);
for (r = 0; r < rectlist.numrects; r++, rectlist.rect++)
for (y = rectlist.rect->min_y; y <= rectlist.rect->max_y; y++)
{
UINT16 *mo = (UINT16 *)mobitmap->base + mobitmap->rowpixels * y;
UINT16 *pf = (UINT16 *)bitmap->base + bitmap->rowpixels * y;
for (x = rectlist.rect->min_x; x <= rectlist.rect->max_x; x++)
if (mo[x])
{
/* verified from the GALs on the real PCB; equations follow
*
* --- O13 is 1 if (PFS7-4 == 0xf)
* O13=PFS6*PFS7*(PFS5&PFS4)
*
* --- PF/M is 1 if MOs have priority, or 0 if playfield has priority
* MO/PF=!PFS7*!(LBD7&LBD6)*!M1*!O13
* +!PFS7*!(LBD7&LBD6)*!M2*!O13
* +!PFS7*!(LBD7&LBD6)*!M3*!O13
* +PFS7*(LBD7&LBD6)*!M1*!O13
* +PFS7*(LBD7&LBD6)*!M2*!O13
* +PFS7*(LBD7&LBD6)*!M3*!O13
*
*/
int o13 = ((pf[x] & 0xf0) == 0xf0);
int mopf = 0;
/* compute the MO/PF signal */
if ((!(pf[x] & 0x80) && ((mo[x] & 0xc0) != 0xc0) && ((mo[x] & 0x0e) != 0x00) && !o13) ||
((pf[x] & 0x80) && ((mo[x] & 0xc0) == 0xc0) && ((mo[x] & 0x0e) != 0x00) && !o13))
mopf = 1;
/* if MO/PF is 1, we draw the MO */
if (mopf)
pf[x] = mo[x];
/* erase behind ourselves */
mo[x] = 0;
}
}
return 0;
}