diff options
Diffstat (limited to 'src/mame/video/timelimt.c')
-rw-r--r-- | src/mame/video/timelimt.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/src/mame/video/timelimt.c b/src/mame/video/timelimt.c new file mode 100644 index 00000000000..7fd0036985f --- /dev/null +++ b/src/mame/video/timelimt.c @@ -0,0 +1,152 @@ +#include "driver.h" + +/* globals */ +UINT8 *timelimt_bg_videoram; +size_t timelimt_bg_videoram_size; + +/* locals */ +static int scrollx, scrolly; + +static tilemap *bg_tilemap, *fg_tilemap; + +/*************************************************************************** + + Convert the color PROMs into a more useable format. + + Time Limit has two 32 bytes palette PROM, connected to the RGB output this + way: + + bit 7 -- 220 ohm resistor -- BLUE + -- 470 ohm resistor -- BLUE + -- 220 ohm resistor -- GREEN + -- 470 ohm resistor -- GREEN + -- 1 kohm resistor -- GREEN + -- 220 ohm resistor -- RED + -- 470 ohm resistor -- RED + bit 0 -- 1 kohm resistor -- RED + +***************************************************************************/ + +PALETTE_INIT( timelimt ) { + int i; + + for (i = 0;i < machine->drv->total_colors;i++) + { + int bit0,bit1,bit2,r,g,b; + + /* red component */ + bit0 = (*color_prom >> 0) & 0x01; + bit1 = (*color_prom >> 1) & 0x01; + bit2 = (*color_prom >> 2) & 0x01; + r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2; + /* green component */ + bit0 = (*color_prom >> 3) & 0x01; + bit1 = (*color_prom >> 4) & 0x01; + bit2 = (*color_prom >> 5) & 0x01; + g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2; + /* blue component */ + bit0 = (*color_prom >> 6) & 0x01; + bit1 = (*color_prom >> 7) & 0x01; + b = 0x4f * bit0 + 0xa8 * bit1; + + palette_set_color(machine,i,MAKE_RGB(r,g,b)); + color_prom++; + } +} + +/*************************************************************************** + + Start the video hardware emulation. + +***************************************************************************/ + +static TILE_GET_INFO( get_bg_tile_info ) +{ + SET_TILE_INFO(1, timelimt_bg_videoram[tile_index], 0, 0); +} + +static TILE_GET_INFO( get_fg_tile_info ) +{ + SET_TILE_INFO(0, videoram[tile_index], 0, 0); +} + +VIDEO_START( timelimt ) +{ + bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_rows, + TILEMAP_TYPE_PEN, 8, 8, 64, 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, 0); +} + +/***************************************************************************/ + +WRITE8_HANDLER( timelimt_videoram_w ) +{ + videoram[offset] = data; + tilemap_mark_tile_dirty(fg_tilemap, offset); +} + +WRITE8_HANDLER( timelimt_bg_videoram_w ) +{ + timelimt_bg_videoram[offset] = data; + tilemap_mark_tile_dirty(bg_tilemap, offset); +} + +WRITE8_HANDLER( timelimt_scroll_x_lsb_w ) +{ + scrollx &= 0x100; + scrollx |= data & 0xff; +} + +WRITE8_HANDLER( timelimt_scroll_x_msb_w ) +{ + scrollx &= 0xff; + scrollx |= ( data & 1 ) << 8; +} + +WRITE8_HANDLER( timelimt_scroll_y_w ) +{ + scrolly = data; +} + + +static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect) +{ + int offs; + + for( offs = spriteram_size; offs >= 0; offs -= 4 ) + { + int sy = 240 - spriteram[offs]; + int sx = spriteram[offs+3]; + int code = spriteram[offs+1] & 0x3f; + int attr = spriteram[offs+2]; + int flipy = spriteram[offs+1] & 0x80; + int flipx = spriteram[offs+1] & 0x40; + + code += ( attr & 0x80 ) ? 0x40 : 0x00; + code += ( attr & 0x40 ) ? 0x80 : 0x00; + + drawgfx( bitmap, machine->gfx[2], + code, + attr & 7, + flipx,flipy, + sx,sy, + cliprect,TRANSPARENCY_PEN,0); + } +} + + +VIDEO_UPDATE( timelimt ) +{ + tilemap_set_scrollx(bg_tilemap, 0, scrollx); + tilemap_set_scrolly(bg_tilemap, 0, scrolly); + tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0); + + draw_sprites(machine, bitmap, cliprect); + + tilemap_draw(bitmap, cliprect, fg_tilemap, 0, 0); + return 0; +} |