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Diffstat (limited to 'src/mame/video/dogfgt.c')
-rw-r--r--src/mame/video/dogfgt.c243
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;
+}