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Diffstat (limited to 'src/mame/video/mosaic.c')
-rw-r--r--src/mame/video/mosaic.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/src/mame/video/mosaic.c b/src/mame/video/mosaic.c
new file mode 100644
index 00000000000..46ca2b87252
--- /dev/null
+++ b/src/mame/video/mosaic.c
@@ -0,0 +1,87 @@
+/***************************************************************************
+
+ video.c
+
+ Functions to emulate the video hardware of the machine.
+
+***************************************************************************/
+
+#include "driver.h"
+
+
+UINT8 *mosaic_fgvideoram;
+UINT8 *mosaic_bgvideoram;
+
+static tilemap *bg_tilemap,*fg_tilemap;
+
+
+
+/***************************************************************************
+
+ Callbacks for the TileMap code
+
+***************************************************************************/
+
+static TILE_GET_INFO( get_fg_tile_info )
+{
+ tile_index *= 2;
+ SET_TILE_INFO(
+ 0,
+ mosaic_fgvideoram[tile_index] + (mosaic_fgvideoram[tile_index+1] << 8),
+ 0,
+ 0);
+}
+
+static TILE_GET_INFO( get_bg_tile_info )
+{
+ tile_index *= 2;
+ SET_TILE_INFO(
+ 1,
+ mosaic_bgvideoram[tile_index] + (mosaic_bgvideoram[tile_index+1] << 8),
+ 0,
+ 0);
+}
+
+
+
+/***************************************************************************
+
+ Start the video hardware emulation.
+
+***************************************************************************/
+
+VIDEO_START( mosaic )
+{
+ fg_tilemap = tilemap_create(get_fg_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN,8,8,64,32);
+ bg_tilemap = tilemap_create(get_bg_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN, 8,8,64,32);
+
+ tilemap_set_transparent_pen(fg_tilemap,0xff);
+}
+
+
+/***************************************************************************
+
+ Memory handlers
+
+***************************************************************************/
+
+WRITE8_HANDLER( mosaic_fgvideoram_w )
+{
+ mosaic_fgvideoram[offset] = data;
+ tilemap_mark_tile_dirty(fg_tilemap,offset/2);
+}
+
+WRITE8_HANDLER( mosaic_bgvideoram_w )
+{
+ mosaic_bgvideoram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap,offset/2);
+}
+
+
+
+VIDEO_UPDATE( mosaic )
+{
+ tilemap_draw(bitmap,cliprect,bg_tilemap,0,0);
+ tilemap_draw(bitmap,cliprect,fg_tilemap,0,0);
+ return 0;
+}