#include "driver.h"
#include "video/segaic24.h"
#include "includes/system24.h"
VIDEO_START(system24)
{
sys24_tile_vh_start(machine, 0xfff);
sys24_sprite_vh_start();
sys24_mixer_vh_start();
}
static int layer_cmp(const void *pl1, const void *pl2)
{
static const int default_pri[12] = { 0, 1, 2, 3, 4, 5, 6, 7, -4, -3, -2, -1 };
int l1 = *(int *)pl1;
int l2 = *(int *)pl2;
int p1 = sys24_mixer_get_reg(l1) & 7;
int p2 = sys24_mixer_get_reg(l2) & 7;
if(p1 != p2)
return p1 - p2;
return default_pri[l2] - default_pri[l1];
}
VIDEO_UPDATE(system24)
{
int i, level;
int order[12], spri[4];
if(sys24_mixer_get_reg(13) & 1) {
fillbitmap(bitmap, get_black_pen(machine), 0);
return 0;
}
sys24_tile_update(machine);
fillbitmap(priority_bitmap, 0, 0);
fillbitmap(bitmap, machine->pens[0], &machine->screen[0].visarea);
for(i=0; i<12; i++)
order[i] = i;
qsort(order, 12, sizeof(int), layer_cmp);
level = 0;
for(i=0; i<12; i++)
if(order[i] < 8)
sys24_tile_draw(machine, bitmap, cliprect, order[i], level, 0);
else {
spri[order[i]-8] = level;
level++;
}
sys24_sprite_draw(bitmap, cliprect, spri);
return 0;
}