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Diffstat (limited to 'src/mame/video/wc90b.c')
-rw-r--r--src/mame/video/wc90b.c151
1 files changed, 151 insertions, 0 deletions
diff --git a/src/mame/video/wc90b.c b/src/mame/video/wc90b.c
new file mode 100644
index 00000000000..e00092377c6
--- /dev/null
+++ b/src/mame/video/wc90b.c
@@ -0,0 +1,151 @@
+#include "driver.h"
+
+
+UINT8 *wc90b_fgvideoram,*wc90b_bgvideoram,*wc90b_txvideoram;
+
+UINT8 *wc90b_scroll1x;
+UINT8 *wc90b_scroll2x;
+
+UINT8 *wc90b_scroll1y;
+UINT8 *wc90b_scroll2y;
+
+
+static tilemap *tx_tilemap,*fg_tilemap,*bg_tilemap;
+
+
+
+
+/***************************************************************************
+
+ Callbacks for the TileMap code
+
+***************************************************************************/
+
+static TILE_GET_INFO( get_bg_tile_info )
+{
+ int attr = wc90b_bgvideoram[tile_index];
+ int tile = wc90b_bgvideoram[tile_index + 0x800];
+ SET_TILE_INFO(
+ 9 + ((attr & 3) + ((attr >> 1) & 4)),
+ tile,
+ attr >> 4,
+ 0);
+}
+
+static TILE_GET_INFO( get_fg_tile_info )
+{
+ int attr = wc90b_fgvideoram[tile_index];
+ int tile = wc90b_fgvideoram[tile_index + 0x800];
+ SET_TILE_INFO(
+ 1 + ((attr & 3) + ((attr >> 1) & 4)),
+ tile,
+ attr >> 4,
+ 0);
+}
+
+static TILE_GET_INFO( get_tx_tile_info )
+{
+ SET_TILE_INFO(
+ 0,
+ wc90b_txvideoram[tile_index + 0x800] + ((wc90b_txvideoram[tile_index] & 0x07) << 8),
+ wc90b_txvideoram[tile_index] >> 4,
+ 0);
+}
+
+
+
+/***************************************************************************
+
+ Start the video hardware emulation.
+
+***************************************************************************/
+
+VIDEO_START( wc90b )
+{
+ bg_tilemap = tilemap_create(get_bg_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN, 16,16,64,32);
+ fg_tilemap = tilemap_create(get_fg_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN,16,16,64,32);
+ tx_tilemap = tilemap_create(get_tx_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN, 8, 8,64,32);
+
+ tilemap_set_transparent_pen(fg_tilemap,15);
+ tilemap_set_transparent_pen(tx_tilemap,15);
+}
+
+
+
+/***************************************************************************
+
+ Memory handlers
+
+***************************************************************************/
+
+WRITE8_HANDLER( wc90b_bgvideoram_w )
+{
+ wc90b_bgvideoram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap,offset & 0x7ff);
+}
+
+WRITE8_HANDLER( wc90b_fgvideoram_w )
+{
+ wc90b_fgvideoram[offset] = data;
+ tilemap_mark_tile_dirty(fg_tilemap,offset & 0x7ff);
+}
+
+WRITE8_HANDLER( wc90b_txvideoram_w )
+{
+ wc90b_txvideoram[offset] = data;
+ tilemap_mark_tile_dirty(tx_tilemap,offset & 0x7ff);
+}
+
+
+
+/***************************************************************************
+
+ Display refresh
+
+***************************************************************************/
+
+static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect, int priority ){
+ int offs;
+
+ /* draw all visible sprites of specified priority */
+ for ( offs = spriteram_size - 8;offs >= 0;offs -= 8 ){
+
+ if ( ( ~( spriteram[offs+3] >> 6 ) & 3 ) == priority ) {
+
+ if ( spriteram[offs+1] > 16 ) { /* visible */
+ int code = ( spriteram[offs+3] & 0x3f ) << 4;
+ int bank = spriteram[offs+0];
+ int flags = spriteram[offs+4];
+
+ code += ( bank & 0xf0 ) >> 4;
+ code <<= 2;
+ code += ( bank & 0x0f ) >> 2;
+
+ drawgfx( bitmap,machine->gfx[ 17 ], code,
+ flags >> 4, /* color */
+ bank&1, /* flipx */
+ bank&2, /* flipy */
+ spriteram[offs + 2], /* sx */
+ 240 - spriteram[offs + 1], /* sy */
+ cliprect,TRANSPARENCY_PEN,15 );
+ }
+ }
+ }
+}
+
+VIDEO_UPDATE( wc90b )
+{
+ tilemap_set_scrollx(bg_tilemap,0,8 * wc90b_scroll2x[0] + 256);
+ tilemap_set_scrolly(bg_tilemap,0,wc90b_scroll2y[0] + ((wc90b_scroll2y[0] < 0x10 || wc90b_scroll2y[0] == 0xff) ? 256 : 0));
+ tilemap_set_scrollx(fg_tilemap,0,8 * wc90b_scroll1x[0] + 256);
+ tilemap_set_scrolly(fg_tilemap,0,wc90b_scroll1y[0] + ((wc90b_scroll1y[0] < 0x10 || wc90b_scroll1y[0] == 0xff) ? 256 : 0));
+
+// draw_sprites(machine, bitmap,cliprect, 3 );
+ tilemap_draw(bitmap,cliprect,bg_tilemap,0,0);
+ draw_sprites(machine, bitmap,cliprect, 2 );
+ tilemap_draw(bitmap,cliprect,fg_tilemap,0,0);
+ draw_sprites(machine, bitmap,cliprect, 1 );
+ tilemap_draw(bitmap,cliprect,tx_tilemap,0,0);
+ draw_sprites(machine, bitmap,cliprect, 0 );
+ return 0;
+}