summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/video/news.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/mame/video/news.c')
-rw-r--r--src/mame/video/news.c103
1 files changed, 103 insertions, 0 deletions
diff --git a/src/mame/video/news.c b/src/mame/video/news.c
new file mode 100644
index 00000000000..560c4b5f8db
--- /dev/null
+++ b/src/mame/video/news.c
@@ -0,0 +1,103 @@
+#include "driver.h"
+#include "news.h"
+
+
+UINT8 *news_fgram;
+UINT8 *news_bgram;
+
+static int bgpic;
+static tilemap *fg_tilemap, *bg_tilemap;
+
+
+
+/***************************************************************************
+
+ Callbacks for the TileMap code
+
+***************************************************************************/
+
+static TILE_GET_INFO( get_fg_tile_info )
+{
+ int code = (news_fgram[tile_index*2] << 8) | news_fgram[tile_index*2+1];
+ SET_TILE_INFO(
+ 0,
+ code & 0x0fff,
+ (code & 0xf000) >> 12,
+ 0);
+}
+
+static TILE_GET_INFO( get_bg_tile_info )
+{
+ int code = (news_bgram[tile_index*2] << 8) | news_bgram[tile_index*2+1];
+ int color = (code & 0xf000) >> 12;
+
+ code &= 0x0fff;
+ if ((code & 0x0e00) == 0x0e00) code = (code & 0x1ff) | (bgpic << 9);
+
+ SET_TILE_INFO(
+ 0,
+ code,
+ color,
+ 0);
+}
+
+
+
+/***************************************************************************
+
+ Start the video hardware emulation.
+
+***************************************************************************/
+
+VIDEO_START( news )
+{
+
+ fg_tilemap = tilemap_create(get_fg_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN,8,8,32, 32);
+ tilemap_set_transparent_pen(fg_tilemap,0);
+
+ bg_tilemap = tilemap_create(get_bg_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN,8,8,32, 32);
+}
+
+
+
+/***************************************************************************
+
+ Memory handlers
+
+***************************************************************************/
+
+WRITE8_HANDLER( news_fgram_w )
+{
+ news_fgram[offset] = data;
+ tilemap_mark_tile_dirty(fg_tilemap,offset/2);
+}
+
+WRITE8_HANDLER( news_bgram_w )
+{
+ news_bgram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap,offset/2);
+}
+
+WRITE8_HANDLER( news_bgpic_w )
+{
+ if (bgpic != data)
+ {
+ bgpic = data;
+ tilemap_mark_all_tiles_dirty(bg_tilemap);
+ }
+}
+
+
+
+/***************************************************************************
+
+ Display refresh
+
+***************************************************************************/
+
+VIDEO_UPDATE( news )
+{
+ tilemap_draw(bitmap,cliprect,bg_tilemap,0,0);
+ tilemap_draw(bitmap,cliprect,fg_tilemap,0,0);
+ return 0;
+}