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#include "driver.h"
#include "video/konicdev.h"
static int AVAC_bits[4], AVAC_occupancy[4];
static int layer_colorbase[4], layer_pri[4];
static int AVAC_vrc, sprite_colorbase;
void gijoe_sprite_callback(running_machine *machine, int *code, int *color, int *priority_mask)
{
int pri, c = *color;
pri = (c & 0x03e0) >> 4;
if (pri <= layer_pri[3]) *priority_mask = 0; else
if (pri > layer_pri[3] && pri <= layer_pri[2]) *priority_mask = 0xff00; else
if (pri > layer_pri[2] && pri <= layer_pri[1]) *priority_mask = 0xff00|0xf0f0; else
if (pri > layer_pri[1] && pri <= layer_pri[0]) *priority_mask = 0xff00|0xf0f0|0xcccc; else
*priority_mask = 0xff00|0xf0f0|0xcccc|0xaaaa;
*color = sprite_colorbase | (c & 0x001f);
}
void gijoe_tile_callback(running_machine *machine, int layer, int *code, int *color, int *flags)
{
int tile = *code;
if (tile >= 0xf000 && tile <= 0xf4ff)
{
tile &= 0x0fff;
if (tile < 0x0310) { AVAC_occupancy[layer] |= 0x0f00; tile |= AVAC_bits[0]; } else
if (tile < 0x0470) { AVAC_occupancy[layer] |= 0xf000; tile |= AVAC_bits[1]; } else
{ AVAC_occupancy[layer] |= 0x00f0; tile |= AVAC_bits[2]; }
*code = tile;
}
*color = (*color>>2 & 0x0f) | layer_colorbase[layer];
}
VIDEO_START( gijoe )
{
const device_config *k056832 = devtag_get_device(machine, "k056832");
int i;
k056832_linemap_enable(k056832, 1);
for (i = 0; i < 4; i++)
AVAC_occupancy[i] = 0;
AVAC_vrc = 0xffff;
}
/* useful function to sort the four tile layers by priority order */
static void sortlayers(int *layer, int *pri)
{
#define SWAP(a,b) \
if (pri[a] <= pri[b]) \
{ \
int t; \
t = pri[a]; pri[a] = pri[b]; pri[b] = t; \
t = layer[a]; layer[a] = layer[b]; layer[b] = t; \
}
SWAP(0, 1)
SWAP(0, 2)
SWAP(0, 3)
SWAP(1, 2)
SWAP(1, 3)
SWAP(2, 3)
}
VIDEO_UPDATE( gijoe )
{
const device_config *k056832 = devtag_get_device(screen->machine, "k056832");
const device_config *k053251 = devtag_get_device(screen->machine, "k053251");
const device_config *k053246 = devtag_get_device(screen->machine, "k053246");
static const int K053251_CI[4] = { K053251_CI1, K053251_CI2, K053251_CI3, K053251_CI4 };
int layer[4];
int vrc_mode, vrc_new, colorbase_new, primode, dirty, i;
int mask = 0;
// update tile offsets
k056832_read_avac(k056832, &vrc_mode, &vrc_new);
if (vrc_mode)
{
for (dirty = 0xf000; dirty; dirty >>= 4)
if ((AVAC_vrc & dirty) != (vrc_new & dirty))
mask |= dirty;
AVAC_vrc = vrc_new;
AVAC_bits[0] = vrc_new<<4 & 0xf000;
AVAC_bits[1] = vrc_new & 0xf000;
AVAC_bits[2] = vrc_new<<8 & 0xf000;
AVAC_bits[3] = vrc_new<<12 & 0xf000;
}
else
AVAC_bits[3] = AVAC_bits[2] = AVAC_bits[1] = AVAC_bits[0] = 0xf000;
// update color info and refresh tilemaps
sprite_colorbase = k053251_get_palette_index(k053251, K053251_CI0);
for (i = 0; i < 4; i++)
{
dirty = 0;
colorbase_new = k053251_get_palette_index(k053251, K053251_CI[i]);
if (layer_colorbase[i] != colorbase_new)
{
layer_colorbase[i] = colorbase_new;
dirty = 1;
}
if (AVAC_occupancy[i] & mask)
dirty = 1;
if (dirty)
{
AVAC_occupancy[i] = 0;
k056832_mark_plane_dirty(k056832, i);
}
}
/*
Layer A is supposed to be a non-scrolling status display with static X-offset.
The weird thing is tilemap alignment only follows the 832 standard when 2 is
written to the layer's X-scroll register otherwise the chip expects totally
different alignment values.
*/
if (k056832_read_register(k056832, 0x14) == 2)
{
k056832_set_layer_offs(k056832, 0, 2, 0);
k056832_set_layer_offs(k056832, 1, 4, 0);
k056832_set_layer_offs(k056832, 2, 6, 0); // 7?
k056832_set_layer_offs(k056832, 3, 8, 0);
}
else
{
k056832_set_layer_offs(k056832, 0, 0, 0);
k056832_set_layer_offs(k056832, 1, 8, 0);
k056832_set_layer_offs(k056832, 2, 14, 0);
k056832_set_layer_offs(k056832, 3, 16, 0); // smaller?
}
// seems to switch the K053251 between different priority modes, detail unknown
primode = k053251_get_priority(k053251, K053251_CI1);
layer[0] = 0;
layer_pri[0] = 0; // not sure
layer[1] = 1;
layer_pri[1] = k053251_get_priority(k053251, K053251_CI2);
layer[2] = 2;
layer_pri[2] = k053251_get_priority(k053251, K053251_CI3);
layer[3] = 3;
layer_pri[3] = k053251_get_priority(k053251, K053251_CI4);
sortlayers(layer, layer_pri);
bitmap_fill(bitmap, cliprect, get_black_pen(screen->machine));
bitmap_fill(screen->machine->priority_bitmap, cliprect, 0);
k056832_tilemap_draw(k056832, bitmap,cliprect, layer[0], 0, 1);
k056832_tilemap_draw(k056832, bitmap,cliprect, layer[1], 0, 2);
k056832_tilemap_draw(k056832, bitmap,cliprect, layer[2], 0, 4);
k056832_tilemap_draw(k056832, bitmap,cliprect, layer[3], 0, 8);
k053247_sprites_draw(k053246, bitmap, cliprect);
return 0;
}
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