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Diffstat (limited to 'src/mame/video/mjkjidai.c')
-rw-r--r--src/mame/video/mjkjidai.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/src/mame/video/mjkjidai.c b/src/mame/video/mjkjidai.c
new file mode 100644
index 00000000000..c279586d94c
--- /dev/null
+++ b/src/mame/video/mjkjidai.c
@@ -0,0 +1,141 @@
+#include "driver.h"
+
+
+UINT8 *mjkjidai_videoram;
+
+static int display_enable;
+static tilemap *bg_tilemap;
+
+
+
+/***************************************************************************
+
+ Callbacks for the TileMap code
+
+***************************************************************************/
+
+static TILE_GET_INFO( get_tile_info )
+{
+ int attr = mjkjidai_videoram[tile_index + 0x800];
+ int code = mjkjidai_videoram[tile_index] + ((attr & 0x1f) << 8);
+ int color = mjkjidai_videoram[tile_index + 0x1000];
+ SET_TILE_INFO(0,code,color >> 3,0);
+}
+
+
+
+/***************************************************************************
+
+ Start the video hardware emulation.
+
+***************************************************************************/
+
+VIDEO_START( mjkjidai )
+{
+ bg_tilemap = tilemap_create(get_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN,8,8,64,32);
+}
+
+
+
+/***************************************************************************
+
+ Memory handlers
+
+***************************************************************************/
+
+WRITE8_HANDLER( mjkjidai_videoram_w )
+{
+ mjkjidai_videoram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap,offset & 0x7ff);
+}
+
+WRITE8_HANDLER( mjkjidai_ctrl_w )
+{
+ UINT8 *rom = memory_region(REGION_CPU1);
+
+// logerror("%04x: port c0 = %02x\n",activecpu_get_pc(),data);
+
+ /* bit 0 = NMI enable */
+ interrupt_enable_w(0,data & 1);
+
+ /* bit 1 = flip screen */
+ flip_screen_set(data & 0x02);
+
+ /* bit 2 =display enable */
+ display_enable = data & 0x04;
+
+ /* bit 5 = coin counter */
+ coin_counter_w(0,data & 0x20);
+
+ /* bits 6-7 select ROM bank */
+ if (data & 0xc0)
+ {
+ memory_set_bankptr(1,rom + 0x10000-0x4000 + ((data & 0xc0) << 8));
+ }
+ else
+ {
+ /* there is code flowing from 7fff to this bank so they have to be contiguous in memory */
+ memory_set_bankptr(1,rom + 0x08000);
+ }
+}
+
+
+
+/***************************************************************************
+
+ Display refresh
+
+***************************************************************************/
+
+static void draw_sprites(running_machine *machine, mame_bitmap *bitmap,const rectangle *cliprect)
+{
+ int offs;
+
+ for (offs = 0x20-2;offs >= 0;offs -= 2)
+ {
+ int code = spriteram[offs] + ((spriteram_2[offs] & 0x1f) << 8);
+ int color = (spriteram_3[offs] & 0x78) >> 3;
+ int sx = 2*spriteram_2[offs+1];
+ int sy = 240 - spriteram[offs+1];
+ int flipx = code & 1;
+ int flipy = code & 2;
+
+ code >>= 2;
+
+ sx += (spriteram_2[offs] & 0x20) >> 5; // not sure about this
+
+ if (flip_screen)
+ {
+ sx = 496 - sx;
+ sy = 240 - sy;
+ flipx = !flipx;
+ flipy = !flipy;
+ }
+
+ sx += 16;
+ sy += 1;
+
+ drawgfx(bitmap,machine->gfx[1],
+ code,
+ color,
+ flipx,flipy,
+ sx,sy,
+ cliprect,TRANSPARENCY_PEN,0);
+ }
+}
+
+
+
+VIDEO_UPDATE( mjkjidai )
+{
+ if (!display_enable)
+ {
+ fillbitmap(bitmap,get_black_pen(machine),cliprect);
+ }
+ else
+ {
+ tilemap_draw(bitmap,cliprect,bg_tilemap,0,0);
+ draw_sprites(machine, bitmap,cliprect);
+ }
+ return 0;
+}