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Diffstat (limited to 'src/mame/video/iqblock.c')
-rw-r--r--src/mame/video/iqblock.c103
1 files changed, 103 insertions, 0 deletions
diff --git a/src/mame/video/iqblock.c b/src/mame/video/iqblock.c
new file mode 100644
index 00000000000..c70b8aab076
--- /dev/null
+++ b/src/mame/video/iqblock.c
@@ -0,0 +1,103 @@
+#include "driver.h"
+#include "iqblock.h"
+
+
+UINT8 *iqblock_bgvideoram;
+//UINT8 *iqblock_fgscroll;
+UINT8 *iqblock_fgvideoram;
+int iqblock_videoenable;
+int iqblock_video_type;
+
+static tilemap *bg_tilemap,*fg_tilemap;
+
+
+/***************************************************************************
+
+ Callbacks for the TileMap code
+
+***************************************************************************/
+
+static TILE_GET_INFO( get_bg_tile_info )
+{
+ int code = iqblock_bgvideoram[tile_index] + (iqblock_bgvideoram[tile_index + 0x800] << 8);
+ SET_TILE_INFO(
+ 0,
+ code &(iqblock_video_type ? 0x1fff : 0x3fff),
+ iqblock_video_type? (2*(code >> 13)+1) : (4*(code >> 14)+3),
+ 0);
+}
+
+static TILE_GET_INFO( get_fg_tile_info )
+{
+ int code = iqblock_fgvideoram[tile_index];
+ SET_TILE_INFO(
+ 1,
+ code & 0x7f,
+ (code & 0x80) ? 3 : 0,
+ 0);
+}
+
+
+
+/***************************************************************************
+
+ Start the video hardware emulation.
+
+***************************************************************************/
+
+VIDEO_START( iqblock )
+{
+ bg_tilemap = tilemap_create(get_bg_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN, 8, 8,64,32);
+ fg_tilemap = tilemap_create(get_fg_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN,8,32,64, 8);
+
+ tilemap_set_transparent_pen(bg_tilemap,0);
+ tilemap_set_scroll_cols(fg_tilemap,64);
+}
+
+
+
+/***************************************************************************
+
+ Memory handlers
+
+***************************************************************************/
+
+WRITE8_HANDLER( iqblock_fgvideoram_w )
+{
+ iqblock_fgvideoram[offset] = data;
+ tilemap_mark_tile_dirty(fg_tilemap,offset);
+}
+
+WRITE8_HANDLER( iqblock_bgvideoram_w )
+{
+ iqblock_bgvideoram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap,offset & 0x7ff);
+}
+
+READ8_HANDLER( iqblock_bgvideoram_r )
+{
+ return iqblock_bgvideoram[offset];
+}
+
+WRITE8_HANDLER( iqblock_fgscroll_w )
+{
+ tilemap_set_scrolly(fg_tilemap,offset,data);
+}
+
+
+
+/***************************************************************************
+
+ Display refresh
+
+***************************************************************************/
+
+VIDEO_UPDATE( iqblock )
+{
+ if (!iqblock_videoenable) return 0;
+ tilemap_draw(bitmap,cliprect,fg_tilemap,0,0);
+ tilemap_draw(bitmap,cliprect,bg_tilemap,0,0);
+
+ return 0;
+}
+