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Diffstat (limited to 'src/mame/video/atetris.c')
-rw-r--r--src/mame/video/atetris.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/src/mame/video/atetris.c b/src/mame/video/atetris.c
new file mode 100644
index 00000000000..91fce2e9bb5
--- /dev/null
+++ b/src/mame/video/atetris.c
@@ -0,0 +1,67 @@
+/***************************************************************************
+
+ Atari Tetris hardware
+
+***************************************************************************/
+
+#include "driver.h"
+#include "atetris.h"
+
+
+static tilemap *bg_tilemap;
+
+
+/*************************************
+ *
+ * Tilemap callback
+ *
+ *************************************/
+
+static TILE_GET_INFO( get_tile_info )
+{
+ int code = videoram[tile_index * 2] | ((videoram[tile_index * 2 + 1] & 7) << 8);
+ int color = (videoram[tile_index * 2 + 1] & 0xf0) >> 4;
+
+ SET_TILE_INFO(0, code, color, 0);
+}
+
+
+
+/*************************************
+ *
+ * Video RAM write
+ *
+ *************************************/
+
+WRITE8_HANDLER( atetris_videoram_w )
+{
+ videoram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap, offset / 2);
+}
+
+
+
+/*************************************
+ *
+ * Video system start
+ *
+ *************************************/
+
+VIDEO_START( atetris )
+{
+ bg_tilemap = tilemap_create(get_tile_info, tilemap_scan_rows, TILEMAP_TYPE_PEN, 8,8, 64,32);
+}
+
+
+
+/*************************************
+ *
+ * Main refresh
+ *
+ *************************************/
+
+VIDEO_UPDATE( atetris )
+{
+ tilemap_draw(bitmap, cliprect, bg_tilemap, 0,0);
+ return 0;
+}