/***************************************************************************
Goindol
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "emu.h"
#include "includes/goindol.h"
/***************************************************************************
Callbacks for the TileMap code
***************************************************************************/
static TILE_GET_INFO( get_fg_tile_info )
{
goindol_state *state = machine.driver_data<goindol_state>();
int code = state->m_fg_videoram[2 * tile_index + 1];
int attr = state->m_fg_videoram[2 * tile_index];
SET_TILE_INFO(
0,
code | ((attr & 0x7) << 8) | (state->m_char_bank << 11),
(attr & 0xf8) >> 3,
0);
}
static TILE_GET_INFO( get_bg_tile_info )
{
goindol_state *state = machine.driver_data<goindol_state>();
int code = state->m_bg_videoram[2 * tile_index + 1];
int attr = state->m_bg_videoram[2 * tile_index];
SET_TILE_INFO(
1,
code | ((attr & 0x7) << 8) | (state->m_char_bank << 11),
(attr & 0xf8) >> 3,
0);
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
VIDEO_START( goindol )
{
goindol_state *state = machine.driver_data<goindol_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);
tilemap_set_transparent_pen(state->m_fg_tilemap, 0);
}
/***************************************************************************
Memory handlers
***************************************************************************/
WRITE8_HANDLER( goindol_fg_videoram_w )
{
goindol_state *state = space->machine().driver_data<goindol_state>();
state->m_fg_videoram[offset] = data;
tilemap_mark_tile_dirty(state->m_fg_tilemap, offset / 2);
}
WRITE8_HANDLER( goindol_bg_videoram_w )
{
goindol_state *state = space->machine().driver_data<goindol_state>();
state->m_bg_videoram[offset] = data;
tilemap_mark_tile_dirty(state->m_bg_tilemap, offset / 2);
}
/***************************************************************************
Display refresh
***************************************************************************/
static void draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect, int gfxbank, UINT8 *sprite_ram )
{
goindol_state *state = machine.driver_data<goindol_state>();
int offs, sx, sy, tile, palette;
for (offs = 0; offs < state->m_spriteram_size; offs += 4)
{
sx = sprite_ram[offs];
sy = 240 - sprite_ram[offs + 1];
if (flip_screen_get(machine))
{
sx = 248 - sx;
sy = 248 - sy;
}
if ((sprite_ram[offs + 1] >> 3) && (sx < 248))
{
tile = ((sprite_ram[offs + 3]) + ((sprite_ram[offs + 2] & 7) << 8));
tile += tile;
palette = sprite_ram[offs + 2] >> 3;
drawgfx_transpen(bitmap,cliprect,
machine.gfx[gfxbank],
tile,
palette,
flip_screen_get(machine),flip_screen_get(machine),
sx,sy, 0);
drawgfx_transpen(bitmap,cliprect,
machine.gfx[gfxbank],
tile+1,
palette,
flip_screen_get(machine),flip_screen_get(machine),
sx,sy + (flip_screen_get(machine) ? -8 : 8), 0);
}
}
}
SCREEN_UPDATE( goindol )
{
goindol_state *state = screen->machine().driver_data<goindol_state>();
tilemap_set_scrollx(state->m_fg_tilemap, 0, *state->m_fg_scrollx);
tilemap_set_scrolly(state->m_fg_tilemap, 0, *state->m_fg_scrolly);
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0);
tilemap_draw(bitmap, cliprect, state->m_fg_tilemap, 0, 0);
draw_sprites(screen->machine(), bitmap, cliprect, 1, state->m_spriteram);
draw_sprites(screen->machine(), bitmap, cliprect, 0, state->m_spriteram2);
return 0;
}