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Diffstat (limited to 'src/mame/video/lkage.c')
-rw-r--r--src/mame/video/lkage.c210
1 files changed, 210 insertions, 0 deletions
diff --git a/src/mame/video/lkage.c b/src/mame/video/lkage.c
new file mode 100644
index 00000000000..77e383a6d05
--- /dev/null
+++ b/src/mame/video/lkage.c
@@ -0,0 +1,210 @@
+#include "driver.h"
+
+static tilemap *bg_tilemap, *fg_tilemap, *tx_tilemap;
+static UINT8 bg_tile_bank, fg_tile_bank;
+UINT8 *lkage_scroll, *lkage_vreg;
+
+/*
+ lkage_scroll[0x00]: text layer horizontal scroll
+ lkage_scroll[0x01]: text layer vertical scroll
+ lkage_scroll[0x02]: foreground layer horizontal scroll
+ lkage_scroll[0x03]: foreground layer vertical scroll
+ lkage_scroll[0x04]: background layer horizontal scroll
+ lkage_scroll[0x05]: background layer vertical scroll
+
+ lkage_vreg[0]: 0x00,0x04
+ 0x04: fg tile bank select
+ 0x08: ?
+
+ lkage_vreg[1]: 0x7d
+ 0xf0: background/foreground palette select
+ 0x08: bg tile bank select
+ 0x07: priority config?
+
+ lkage_vreg[2]: 0xf3
+ 0x03: flip screen x/y
+ 0xf0: normally 1111, but 1001 and 0001 inbetween stages (while the
+ backgrounds are are being redrawn). These bits are probably used to enable
+ individual layers, but we have no way of knowing the mapping.
+
+ lkage_vreg:
+ 04 7d f3 : title screen 101
+ 0c 7d f3 : high score 101
+ 04 06 f3 : attract#1 110
+ 04 1e f3 : attract#2 110
+ 04 1e f3 : attract#3 110
+ 00 4e f3 : attract#4 110
+*/
+
+WRITE8_HANDLER( lkage_videoram_w )
+{
+ videoram[offset] = data;
+
+ switch( offset/0x400 )
+ {
+ case 0:
+ tilemap_mark_tile_dirty(tx_tilemap,offset & 0x3ff);
+ break;
+
+ case 1:
+ tilemap_mark_tile_dirty(fg_tilemap,offset & 0x3ff);
+ break;
+
+ case 2:
+ tilemap_mark_tile_dirty(bg_tilemap,offset & 0x3ff);
+ break;
+
+ default:
+ break;
+ }
+} /* lkage_videoram_w */
+
+static TILE_GET_INFO( get_bg_tile_info )
+{
+ int code = videoram[tile_index + 0x800] + 256 * (bg_tile_bank?5:1);
+ SET_TILE_INFO( 0/*gfx*/, code, 0/*color*/, 0/*flags*/ );
+}
+
+static TILE_GET_INFO( get_fg_tile_info )
+{
+ int code = videoram[tile_index + 0x400] + 256 * (fg_tile_bank?1:0);
+ SET_TILE_INFO( 0/*gfx*/, code, 0/*color*/, 0/*flags*/);
+}
+
+static TILE_GET_INFO( get_tx_tile_info )
+{
+ int code = videoram[tile_index];
+ SET_TILE_INFO( 0/*gfx*/, code, 0/*color*/, 0/*flags*/);
+}
+
+VIDEO_START( lkage )
+{
+ bg_tile_bank = fg_tile_bank = 0;
+
+ bg_tilemap = tilemap_create(get_bg_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN, 8,8,32,32);
+ fg_tilemap = tilemap_create(get_fg_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN,8,8,32,32);
+ tx_tilemap = tilemap_create(get_tx_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN,8,8,32,32);
+
+ tilemap_set_transparent_pen(fg_tilemap,0);
+ tilemap_set_transparent_pen(tx_tilemap,0);
+
+ tilemap_set_scrolldx(bg_tilemap,-5,-5+24);
+ tilemap_set_scrolldx(fg_tilemap,-3,-3+24);
+ tilemap_set_scrolldx(tx_tilemap,-1,-1+24);
+} /* VIDEO_START( lkage ) */
+
+
+static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect )
+{
+ const UINT8 *source = spriteram;
+ const UINT8 *finish = source+0x60;
+ while( source<finish )
+ {
+ int attributes = source[2];
+ /* 0x01: horizontal flip
+ * 0x02: vertical flip
+ * 0x04: bank select
+ * 0x08: sprite size
+ * 0x70: color
+ * 0x80: priority
+ */
+ int priority_mask = 0;
+ int color = (attributes>>4)&7;
+ int flipx = attributes&0x01;
+ int flipy = attributes&0x02;
+ int height = (attributes&0x08) ? 2 : 1;
+ int sx = source[0]-15;
+ int sy = 256-16*height-source[1];
+ int sprite_number = source[3] + ((attributes & 0x04) << 6);
+ int y;
+
+ if( attributes&0x80 )
+ {
+ priority_mask = (0xf0|0xcc );
+ }
+ else
+ {
+ priority_mask = (0xf0);
+ }
+
+ if (flip_screen_x)
+ {
+ sx = 239 - sx - 24;
+ flipx = !flipx;
+ }
+ if( flip_screen_y )
+ {
+ sy = 254 - 16*height - sy;
+ flipy = !flipy;
+ }
+ if (height == 2 && !flipy)
+ {
+ sprite_number ^= 1;
+ }
+
+ for (y = 0;y < height;y++)
+ {
+ pdrawgfx(
+ bitmap,
+ machine->gfx[1],
+ sprite_number ^ y,
+ color,
+ flipx,flipy,
+ sx&0xff,
+ sy + 16*y,
+ cliprect,
+ TRANSPARENCY_PEN,0,
+ priority_mask );
+ }
+ source+=4;
+ }
+} /* draw_sprites */
+
+VIDEO_UPDATE( lkage )
+{
+ int bank;
+
+ flip_screen_x_set(~lkage_vreg[2] & 0x01);
+ flip_screen_y_set(~lkage_vreg[2] & 0x02);
+
+ bank = lkage_vreg[1]&0x08;
+ if( bg_tile_bank != bank )
+ {
+ bg_tile_bank = bank;
+ tilemap_mark_all_tiles_dirty( bg_tilemap );
+ }
+
+ bank = lkage_vreg[0]&0x04;
+ if( fg_tile_bank != bank )
+ {
+ fg_tile_bank = bank;
+ tilemap_mark_all_tiles_dirty( fg_tilemap );
+ }
+
+ tilemap_set_palette_offset( bg_tilemap, 0x300 + (lkage_vreg[1]&0xf0) );
+ tilemap_set_palette_offset( fg_tilemap, 0x200 + (lkage_vreg[1]&0xf0) );
+ tilemap_set_palette_offset( tx_tilemap, 0x110 );
+
+ tilemap_set_scrollx(tx_tilemap,0,lkage_scroll[0]);
+ tilemap_set_scrolly(tx_tilemap,0,lkage_scroll[1]);
+
+ tilemap_set_scrollx(fg_tilemap,0,lkage_scroll[2]);
+ tilemap_set_scrolly(fg_tilemap,0,lkage_scroll[3]);
+
+ tilemap_set_scrollx(bg_tilemap,0,lkage_scroll[4]);
+ tilemap_set_scrolly(bg_tilemap,0,lkage_scroll[5]);
+
+ fillbitmap(priority_bitmap, 0, cliprect);
+ if ((lkage_vreg[2] & 0xf0) == 0xf0)
+ {
+ tilemap_draw( bitmap,cliprect,bg_tilemap,0,1 );
+ tilemap_draw( bitmap,cliprect,fg_tilemap,0,(lkage_vreg[1]&2)?2:4 );
+ tilemap_draw( bitmap,cliprect,tx_tilemap,0,4 );
+ }
+ else
+ {
+ tilemap_draw( bitmap,cliprect,tx_tilemap,TILEMAP_DRAW_OPAQUE,0);
+ }
+ draw_sprites(machine, bitmap,cliprect );
+ return 0;
+}