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Diffstat (limited to 'src/mame/video/sderby.c')
-rw-r--r--src/mame/video/sderby.c142
1 files changed, 142 insertions, 0 deletions
diff --git a/src/mame/video/sderby.c b/src/mame/video/sderby.c
new file mode 100644
index 00000000000..c9cc5e5f485
--- /dev/null
+++ b/src/mame/video/sderby.c
@@ -0,0 +1,142 @@
+#include "driver.h"
+
+static tilemap *sderby_tilemap;
+extern UINT16 *sderby_videoram;
+
+static tilemap *sderby_md_tilemap;
+extern UINT16 *sderby_md_videoram;
+
+static tilemap *sderby_fg_tilemap;
+extern UINT16 *sderby_fg_videoram;
+
+/* BG Layer */
+
+static TILE_GET_INFO( get_sderby_tile_info )
+{
+ int tileno,colour;
+
+ tileno = sderby_videoram[tile_index*2];
+ colour = sderby_videoram[tile_index*2+1] & 0x0f;
+
+ SET_TILE_INFO(1,tileno,colour,0);
+}
+
+WRITE16_HANDLER( sderby_videoram_w )
+{
+ COMBINE_DATA(&sderby_videoram[offset]);
+ tilemap_mark_tile_dirty(sderby_tilemap,offset/2);
+}
+
+/* MD Layer */
+
+static TILE_GET_INFO( get_sderby_md_tile_info )
+{
+ int tileno,colour;
+
+ tileno = sderby_md_videoram[tile_index*2];
+ colour = sderby_md_videoram[tile_index*2+1] & 0x0f;
+
+ SET_TILE_INFO(1,tileno,colour+16,0);
+}
+
+WRITE16_HANDLER( sderby_md_videoram_w )
+{
+ COMBINE_DATA(&sderby_md_videoram[offset]);
+ tilemap_mark_tile_dirty(sderby_md_tilemap,offset/2);
+}
+
+/* FG Layer */
+
+static TILE_GET_INFO( get_sderby_fg_tile_info )
+{
+ int tileno,colour;
+
+ tileno = sderby_fg_videoram[tile_index*2];
+ colour = sderby_fg_videoram[tile_index*2+1] & 0x0f;
+
+ SET_TILE_INFO(0,tileno,colour+32,0);
+}
+
+WRITE16_HANDLER( sderby_fg_videoram_w )
+{
+ COMBINE_DATA(&sderby_fg_videoram[offset]);
+ tilemap_mark_tile_dirty(sderby_fg_tilemap,offset/2);
+}
+
+
+static void draw_sprites(running_machine *machine, mame_bitmap *bitmap,const rectangle *cliprect,int codeshift)
+{
+ int offs;
+ int height = machine->gfx[0]->height;
+ int colordiv = machine->gfx[0]->color_granularity / 16;
+
+ for (offs = 4;offs < spriteram_size/2;offs += 4)
+ {
+ int sx,sy,code,color,flipx;
+
+ sy = spriteram16[offs+3-4]; /* -4? what the... ??? */
+ if (sy == 0x2000) return; /* end of list marker */
+
+ flipx = sy & 0x4000;
+ sx = (spriteram16[offs+1] & 0x01ff) - 16-7;
+ sy = (256-8-height - sy) & 0xff;
+ code = spriteram16[offs+2] >> codeshift;
+ color = (spriteram16[offs+1] & 0x3e00) >> 9;
+
+ drawgfx(bitmap,machine->gfx[1],
+ code,
+ color/colordiv+48,
+ flipx,0,
+ sx,sy,
+ cliprect,TRANSPARENCY_PEN,0);
+ }
+}
+
+
+VIDEO_START( sderby )
+{
+ sderby_tilemap = tilemap_create(get_sderby_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN, 16, 16,32,32);
+ sderby_md_tilemap = tilemap_create(get_sderby_md_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN, 16, 16,32,32);
+
+ tilemap_set_transparent_pen(sderby_md_tilemap,0);
+
+ sderby_fg_tilemap = tilemap_create(get_sderby_fg_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN, 8, 8,64,32);
+ tilemap_set_transparent_pen(sderby_fg_tilemap,0);
+}
+
+VIDEO_UPDATE( sderby )
+{
+ tilemap_draw(bitmap,cliprect,sderby_tilemap,0,0);
+ draw_sprites(machine, bitmap,cliprect,0);
+ tilemap_draw(bitmap,cliprect,sderby_md_tilemap,0,0);
+ tilemap_draw(bitmap,cliprect,sderby_fg_tilemap,0,0);
+ return 0;
+}
+
+VIDEO_UPDATE( pmroulet )
+{
+ tilemap_draw(bitmap,cliprect,sderby_tilemap,0,0);
+ tilemap_draw(bitmap,cliprect,sderby_md_tilemap,0,0);
+ draw_sprites(machine, bitmap,cliprect,0);
+ tilemap_draw(bitmap,cliprect,sderby_fg_tilemap,0,0);
+ return 0;
+}
+
+
+WRITE16_HANDLER( sderby_scroll_w )
+{
+ static UINT16 scroll[6];
+
+
+ data = COMBINE_DATA(&scroll[offset]);
+
+ switch (offset)
+ {
+ case 0: tilemap_set_scrollx(sderby_fg_tilemap,0,data+2);break;
+ case 1: tilemap_set_scrolly(sderby_fg_tilemap,0,data-8);break;
+ case 2: tilemap_set_scrollx(sderby_md_tilemap,0,data+4);break;
+ case 3: tilemap_set_scrolly(sderby_md_tilemap,0,data-8);break;
+ case 4: tilemap_set_scrollx(sderby_tilemap,0,data+6); break;
+ case 5: tilemap_set_scrolly(sderby_tilemap,0,data-8); break;
+ }
+}