/***************************************************************************
video/lkage.c
lkage_scroll[0x00]: text layer horizontal scroll
lkage_scroll[0x01]: text layer vertical scroll
lkage_scroll[0x02]: foreground layer horizontal scroll
lkage_scroll[0x03]: foreground layer vertical scroll
lkage_scroll[0x04]: background layer horizontal scroll
lkage_scroll[0x05]: background layer vertical scroll
lkage_vreg[0]: 0x00,0x04
0x02: tx tile bank select (bygone only?)
0x04: fg tile bank select
0x08: ?
lkage_vreg[1]: 0x7d
0xf0: background/foreground palette select
0x08: bg tile bank select
0x07: priority config?
lkage_vreg[2]: 0xf3
0x03: flip screen x/y
0xf0: normally 1111, but 1001 and 0001 inbetween stages (while the
backgrounds are are being redrawn). These bits are probably used to enable
individual layers, but we have no way of knowing the mapping.
lkage_vreg:
04 7d f3 : title screen 101
0c 7d f3 : high score 101
04 06 f3 : attract#1 110
04 1e f3 : attract#2 110
04 1e f3 : attract#3 110
00 4e f3 : attract#4 110
***************************************************************************/
#include "emu.h"
#include "includes/lkage.h"
WRITE8_HANDLER( lkage_videoram_w )
{
lkage_state *state = space->machine().driver_data<lkage_state>();
state->m_videoram[offset] = data;
switch (offset / 0x400)
{
case 0:
tilemap_mark_tile_dirty(state->m_tx_tilemap, offset & 0x3ff);
break;
case 1:
tilemap_mark_tile_dirty(state->m_fg_tilemap, offset & 0x3ff);
break;
case 2:
tilemap_mark_tile_dirty(state->m_bg_tilemap, offset & 0x3ff);
break;
default:
break;
}
}
static TILE_GET_INFO( get_bg_tile_info )
{
lkage_state *state = machine.driver_data<lkage_state>();
int code = state->m_videoram[tile_index + 0x800] + 256 * (state->m_bg_tile_bank ? 5 : 1);
SET_TILE_INFO( 0/*gfx*/, code, 0/*color*/, 0/*flags*/ );
}
static TILE_GET_INFO( get_fg_tile_info )
{
lkage_state *state = machine.driver_data<lkage_state>();
int code = state->m_videoram[tile_index + 0x400] + 256 * (state->m_fg_tile_bank ? 1 : 0);
SET_TILE_INFO( 0/*gfx*/, code, 0/*color*/, 0/*flags*/);
}
static TILE_GET_INFO( get_tx_tile_info )
{
lkage_state *state = machine.driver_data<lkage_state>();
int code = state->m_videoram[tile_index] + 256 * (state->m_tx_tile_bank ? 4 : 0);
SET_TILE_INFO( 0/*gfx*/, code, 0/*color*/, 0/*flags*/);
}
VIDEO_START( lkage )
{
lkage_state *state = machine.driver_data<lkage_state>();
state->m_bg_tilemap = tilemap_create(machine, get_bg_tile_info, tilemap_scan_rows, 8, 8, 32, 32);
state->m_fg_tilemap = tilemap_create(machine, get_fg_tile_info, tilemap_scan_rows, 8, 8, 32, 32);
state->m_tx_tilemap = tilemap_create(machine, get_tx_tile_info, tilemap_scan_rows, 8, 8, 32, 32);
tilemap_set_transparent_pen(state->m_fg_tilemap, 0);
tilemap_set_transparent_pen(state->m_tx_tilemap, 0);
tilemap_set_scrolldx(state->m_bg_tilemap, -5, -5 + 24);
tilemap_set_scrolldx(state->m_fg_tilemap, -3, -3 + 24);
tilemap_set_scrolldx(state->m_tx_tilemap, -1, -1 + 24);
}
static void draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect )
{
lkage_state *state = machine.driver_data<lkage_state>();
const UINT8 *source = state->m_spriteram;
const UINT8 *finish = source + 0x60;
while (source < finish)
{
int attributes = source[2];
/* 0x01: horizontal flip
* 0x02: vertical flip
* 0x04: bank select
* 0x08: sprite size
* 0x70: color
* 0x80: priority
*/
int priority_mask = 0;
int color = (attributes >> 4) & 7;
int flipx = attributes & 0x01;
int flipy = attributes & 0x02;
int height = (attributes & 0x08) ? 2 : 1;
int sx = source[0] - 15 + state->m_sprite_dx;
int sy = 256 - 16 * height - source[1];
int sprite_number = source[3] + ((attributes & 0x04) << 6);
int y;
if (attributes & 0x80)
{
priority_mask = (0xf0 | 0xcc);
}
else
{
priority_mask = 0xf0;
}
if (flip_screen_x_get(machine))
{
sx = 239 - sx - 24;
flipx = !flipx;
}
if (flip_screen_y_get(machine))
{
sy = 254 - 16 * height - sy;
flipy = !flipy;
}
if (height == 2 && !flipy)
{
sprite_number ^= 1;
}
for (y = 0; y < height; y++)
{
pdrawgfx_transpen(
bitmap,
cliprect,
machine.gfx[1],
sprite_number ^ y,
color,
flipx,flipy,
sx&0xff,
sy + 16*y,
machine.priority_bitmap,
priority_mask,0 );
}
source += 4;
}
}
SCREEN_UPDATE( lkage )
{
lkage_state *state = screen->machine().driver_data<lkage_state>();
int bank;
flip_screen_x_set(screen->machine(), ~state->m_vreg[2] & 0x01);
flip_screen_y_set(screen->machine(), ~state->m_vreg[2] & 0x02);
bank = state->m_vreg[1] & 0x08;
if (state->m_bg_tile_bank != bank)
{
state->m_bg_tile_bank = bank;
tilemap_mark_all_tiles_dirty(state->m_bg_tilemap);
}
bank = state->m_vreg[0]&0x04;
if (state->m_fg_tile_bank != bank)
{
state->m_fg_tile_bank = bank;
tilemap_mark_all_tiles_dirty(state->m_fg_tilemap);
}
bank = state->m_vreg[0]&0x02;
if (state->m_tx_tile_bank != bank)
{
state->m_tx_tile_bank = bank;
tilemap_mark_all_tiles_dirty(state->m_tx_tilemap);
}
tilemap_set_palette_offset(state->m_bg_tilemap, 0x300 + (state->m_vreg[1] & 0xf0));
tilemap_set_palette_offset(state->m_fg_tilemap, 0x200 + (state->m_vreg[1] & 0xf0));
tilemap_set_palette_offset(state->m_tx_tilemap, 0x110);
tilemap_set_scrollx(state->m_tx_tilemap, 0, state->m_scroll[0]);
tilemap_set_scrolly(state->m_tx_tilemap, 0, state->m_scroll[1]);
tilemap_set_scrollx(state->m_fg_tilemap, 0, state->m_scroll[2]);
tilemap_set_scrolly(state->m_fg_tilemap, 0, state->m_scroll[3]);
tilemap_set_scrollx(state->m_bg_tilemap, 0, state->m_scroll[4]);
tilemap_set_scrolly(state->m_bg_tilemap, 0, state->m_scroll[5]);
bitmap_fill(screen->machine().priority_bitmap, cliprect, 0);
if ((state->m_vreg[2] & 0xf0) == 0xf0)
{
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 1);
tilemap_draw(bitmap, cliprect, state->m_fg_tilemap, 0, (state->m_vreg[1] & 2) ? 2 : 4);
tilemap_draw(bitmap, cliprect, state->m_tx_tilemap, 0, 4);
draw_sprites(screen->machine(), bitmap, cliprect);
}
else
{
tilemap_draw(bitmap, cliprect, state->m_tx_tilemap, TILEMAP_DRAW_OPAQUE, 0);
}
return 0;
}