diff options
Diffstat (limited to 'src/mame/video/commando.c')
-rw-r--r-- | src/mame/video/commando.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/src/mame/video/commando.c b/src/mame/video/commando.c new file mode 100644 index 00000000000..16c5a533aec --- /dev/null +++ b/src/mame/video/commando.c @@ -0,0 +1,140 @@ +/*************************************************************************** + + video.c + + Functions to emulate the video hardware of the machine. + +***************************************************************************/ + +#include "driver.h" + +UINT8 *commando_videoram2, *commando_colorram2; + +static tilemap *bg_tilemap, *fg_tilemap; + +WRITE8_HANDLER( commando_videoram_w ) +{ + videoram[offset] = data; + tilemap_mark_tile_dirty(bg_tilemap, offset); +} + +WRITE8_HANDLER( commando_colorram_w ) +{ + colorram[offset] = data; + tilemap_mark_tile_dirty(bg_tilemap, offset); +} + +WRITE8_HANDLER( commando_videoram2_w ) +{ + commando_videoram2[offset] = data; + tilemap_mark_tile_dirty(fg_tilemap, offset); +} + +WRITE8_HANDLER( commando_colorram2_w ) +{ + commando_colorram2[offset] = data; + tilemap_mark_tile_dirty(fg_tilemap, offset); +} + +WRITE8_HANDLER( commando_scrollx_w ) +{ + static UINT8 scroll[2]; + + scroll[offset] = data; + tilemap_set_scrollx(bg_tilemap,0,scroll[0] | (scroll[1] << 8)); +} + +WRITE8_HANDLER( commando_scrolly_w ) +{ + static UINT8 scroll[2]; + + scroll[offset] = data; + tilemap_set_scrolly(bg_tilemap,0,scroll[0] | (scroll[1] << 8)); +} + +WRITE8_HANDLER( commando_c804_w ) +{ + // bits 0 and 1 are coin counters + coin_counter_w(0, data & 0x01); + coin_counter_w(1, data & 0x02); + + // bit 4 resets the sound CPU + cpunum_set_input_line(1, INPUT_LINE_RESET, (data & 0x10) ? ASSERT_LINE : CLEAR_LINE); + + // bit 7 flips screen + flip_screen_set(data & 0x80); +} + +static TILE_GET_INFO( get_bg_tile_info ) +{ + int attr = colorram[tile_index]; + int code = videoram[tile_index] + ((attr & 0xc0) << 2); + int color = attr & 0x0f; + int flags = TILE_FLIPYX((attr & 0x30) >> 4); + + SET_TILE_INFO(1, code, color, flags); +} + +static TILE_GET_INFO( get_fg_tile_info ) +{ + int attr = commando_colorram2[tile_index]; + int code = commando_videoram2[tile_index] + ((attr & 0xc0) << 2); + int color = attr & 0x0f; + int flags = TILE_FLIPYX((attr & 0x30) >> 4); + + SET_TILE_INFO(0, code, color, flags); +} + +VIDEO_START( commando ) +{ + bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_cols, + TILEMAP_TYPE_PEN, 16, 16, 32, 32); + + fg_tilemap = tilemap_create(get_fg_tile_info, tilemap_scan_rows, + TILEMAP_TYPE_PEN, 8, 8, 32, 32); + + tilemap_set_transparent_pen(fg_tilemap, 3); +} + +static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect) +{ + int offs; + + for (offs = spriteram_size - 4; offs >= 0; offs -= 4) + { + // bit 1 of attr is not used + int attr = buffered_spriteram[offs + 1]; + int bank = (attr & 0xc0) >> 6; + int code = buffered_spriteram[offs] + 256 * bank; + int color = (attr & 0x30) >> 4; + int flipx = attr & 0x04; + int flipy = attr & 0x08; + int sx = buffered_spriteram[offs + 3] - ((attr & 0x01) << 8); + int sy = buffered_spriteram[offs + 2]; + + if (flip_screen) + { + sx = 240 - sx; + sy = 240 - sy; + flipx = !flipx; + flipy = !flipy; + } + + if (bank < 3) + drawgfx(bitmap,machine->gfx[2], code, color, flipx, flipy, sx, sy, + cliprect, TRANSPARENCY_PEN, 15); + } +} + +VIDEO_UPDATE( commando ) +{ + tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0); + draw_sprites(machine, bitmap, cliprect); + tilemap_draw(bitmap, cliprect, fg_tilemap, 0, 0); + return 0; +} + +VIDEO_EOF( commando ) +{ + buffer_spriteram_w(0, 0); +} |