diff options
Diffstat (limited to 'src/mame/video/dogfgt.c')
-rw-r--r-- | src/mame/video/dogfgt.c | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/src/mame/video/dogfgt.c b/src/mame/video/dogfgt.c new file mode 100644 index 00000000000..f3de2f0e97e --- /dev/null +++ b/src/mame/video/dogfgt.c @@ -0,0 +1,243 @@ +#include "driver.h" +#include "dogfgt.h" + + +UINT8 *dogfgt_bgvideoram; + +static UINT8 *bitmapram; +static int bm_plane; +static mame_bitmap *pixbitmap; +static int pixcolor; +static tilemap *bg_tilemap; + +#define PIXMAP_COLOR_BASE (16+32) + +#define BITMAPRAM_SIZE 0x6000 + + +/*************************************************************************** + + Convert the color PROMs into a more useable format. + + Dog-Fight has both palette RAM and PROMs. The PROMs are used for tiles & + pixmap, RAM for sprites. + +***************************************************************************/ + +PALETTE_INIT( dogfgt ) +{ + int i; + + /* first 16 colors are RAM */ + + for (i = 0;i < 64;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 = 0; + bit1 = (*color_prom >> 6) & 0x01; + bit2 = (*color_prom >> 7) & 0x01; + b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2; + + palette_set_color(machine,i+16,MAKE_RGB(r,g,b)); + color_prom++; + } +} + + +/*************************************************************************** + + Callbacks for the TileMap code + +***************************************************************************/ + +static TILE_GET_INFO( get_tile_info ) +{ + SET_TILE_INFO( + 0, + dogfgt_bgvideoram[tile_index], + dogfgt_bgvideoram[tile_index + 0x400] & 0x03, + 0); +} + + +/*************************************************************************** + + Start the video hardware emulation. + +***************************************************************************/ + +VIDEO_START( dogfgt ) +{ + bg_tilemap = tilemap_create(get_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN,16,16,32,32); + + bitmapram = auto_malloc(BITMAPRAM_SIZE); + + pixbitmap = auto_bitmap_alloc(256,256,machine->screen[0].format); +} + + +/*************************************************************************** + + Memory handlers + +***************************************************************************/ + +WRITE8_HANDLER( dogfgt_plane_select_w ) +{ + bm_plane = data; +} + +READ8_HANDLER( dogfgt_bitmapram_r ) +{ + if (bm_plane > 2) + { + popmessage("bitmapram_r offs %04x plane %d\n",offset,bm_plane); + return 0; + } + + return bitmapram[offset + BITMAPRAM_SIZE/3 * bm_plane]; +} + +static WRITE8_HANDLER( internal_bitmapram_w ) +{ + int x,y,subx; + + + bitmapram[offset] = data; + + offset &= (BITMAPRAM_SIZE/3-1); + x = 8 * (offset / 256); + y = offset % 256; + + for (subx = 0;subx < 8;subx++) + { + int i,color = 0; + + for (i = 0;i < 3;i++) + color |= ((bitmapram[offset + BITMAPRAM_SIZE/3 * i] >> subx) & 1) << i; + if (flip_screen) + *BITMAP_ADDR16(pixbitmap, y^0xff, (x+subx)^0xff) = PIXMAP_COLOR_BASE + 8*pixcolor + color; + else + *BITMAP_ADDR16(pixbitmap, y, x+subx) = PIXMAP_COLOR_BASE + 8*pixcolor + color; + } +} + +WRITE8_HANDLER( dogfgt_bitmapram_w ) +{ + if (bm_plane > 2) + { + popmessage("bitmapram_w offs %04x plane %d\n",offset,bm_plane); + return; + } + + internal_bitmapram_w(offset + BITMAPRAM_SIZE/3 * bm_plane,data); +} + +WRITE8_HANDLER( dogfgt_bgvideoram_w ) +{ + dogfgt_bgvideoram[offset] = data; + tilemap_mark_tile_dirty(bg_tilemap,offset & 0x3ff); +} + +WRITE8_HANDLER( dogfgt_scroll_w ) +{ + static int scroll[4]; + + scroll[offset] = data; + + tilemap_set_scrollx(bg_tilemap,0,scroll[0] + 256 * scroll[1] + 256); + tilemap_set_scrolly(bg_tilemap,0,scroll[2] + 256 * scroll[3]); +} + +WRITE8_HANDLER( dogfgt_1800_w ) +{ + /* bits 0 and 1 are probably text color (not verified because PROM is missing) */ + pixcolor = ((data & 0x01) << 1) | ((data & 0x02) >> 1); + + /* bits 4 and 5 are coin counters */ + coin_counter_w(0,data & 0x10); + coin_counter_w(1,data & 0x20); + + /* bit 7 is screen flip */ + flip_screen_set(data & 0x80); + + /* other bits unused? */ + logerror("PC %04x: 1800 = %02x\n",activecpu_get_pc(),data); +} + + +/*************************************************************************** + + Display refresh + +***************************************************************************/ + +static void draw_sprites(running_machine *machine, mame_bitmap *bitmap,const rectangle *cliprect) +{ + int offs; + + for (offs = 0;offs < spriteram_size;offs += 4) + { + if (spriteram[offs] & 0x01) + { + int sx,sy,flipx,flipy; + + sx = spriteram[offs+3]; + sy = (240 - spriteram[offs+2]) & 0xff; + flipx = spriteram[offs] & 0x04; + flipy = spriteram[offs] & 0x02; + if (flip_screen) + { + sx = 240 - sx; + sy = 240 - sy; + flipx = !flipx; + flipy = !flipy; + } + + drawgfx(bitmap,machine->gfx[1], + spriteram[offs+1] + ((spriteram[offs] & 0x30) << 4), + (spriteram[offs] & 0x08) >> 3, + flipx,flipy, + sx,sy, + cliprect,TRANSPARENCY_PEN,0); + } + } +} + + +VIDEO_UPDATE( dogfgt ) +{ + static int lastflip,lastpixcolor; + int offs; + + + if (lastflip != flip_screen || lastpixcolor != pixcolor) + { + lastflip = flip_screen; + lastpixcolor = pixcolor; + + for (offs = 0;offs < BITMAPRAM_SIZE;offs++) + internal_bitmapram_w(offs,bitmapram[offs]); + } + + + tilemap_draw(bitmap,cliprect,bg_tilemap,0,0); + + draw_sprites(machine, bitmap, cliprect); + + copybitmap(bitmap,pixbitmap,0,0,0,0,cliprect,TRANSPARENCY_COLOR,PIXMAP_COLOR_BASE + 8*pixcolor); + return 0; +} |