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Diffstat (limited to 'src/mame/video/stadhero.c')
-rw-r--r--src/mame/video/stadhero.c169
1 files changed, 169 insertions, 0 deletions
diff --git a/src/mame/video/stadhero.c b/src/mame/video/stadhero.c
new file mode 100644
index 00000000000..71f299c588d
--- /dev/null
+++ b/src/mame/video/stadhero.c
@@ -0,0 +1,169 @@
+/***************************************************************************
+
+ stadhero video emulation - Bryan McPhail, mish@tendril.co.uk
+
+*********************************************************************
+
+ MXC-06 chip to produce sprites, see dec0.c
+ BAC-06 chip for background?
+
+***************************************************************************/
+
+#include "driver.h"
+
+UINT16 *stadhero_pf1_data,*stadhero_pf2_data;
+static tilemap *pf1_tilemap,*pf2_tilemap;
+static int flipscreen;
+
+static UINT16 stadhero_pf2_control_0[8];
+static UINT16 stadhero_pf2_control_1[8];
+
+/******************************************************************************/
+
+static void draw_sprites(running_machine *machine, mame_bitmap *bitmap,const rectangle *cliprect,int pri_mask,int pri_val)
+{
+ int offs;
+
+ for (offs = 0;offs < 0x400;offs += 4)
+ {
+ int x,y,sprite,colour,multi,fx,fy,inc,flash,mult;
+
+ y = spriteram16[offs];
+ if ((y&0x8000) == 0) continue;
+
+ x = spriteram16[offs+2];
+ colour = x >> 12;
+ if ((colour & pri_mask) != pri_val) continue;
+
+ flash=x&0x800;
+ if (flash && (cpu_getcurrentframe() & 1)) continue;
+
+ fx = y & 0x2000;
+ fy = y & 0x4000;
+ multi = (1 << ((y & 0x1800) >> 11)) - 1; /* 1x, 2x, 4x, 8x height */
+ /* multi = 0 1 3 7 */
+
+ sprite = spriteram16[offs+1] & 0x0fff;
+
+ x = x & 0x01ff;
+ y = y & 0x01ff;
+ if (x >= 256) x -= 512;
+ if (y >= 256) y -= 512;
+ x = 240 - x;
+ y = 240 - y;
+
+ sprite &= ~multi;
+ if (fy)
+ inc = -1;
+ else
+ {
+ sprite += multi;
+ inc = 1;
+ }
+
+ if (flip_screen) {
+ y=240-y;
+ x=240-x;
+ if (fx) fx=0; else fx=1;
+ if (fy) fy=0; else fy=1;
+ mult=16;
+ }
+ else mult=-16;
+
+ while (multi >= 0)
+ {
+ drawgfx(bitmap,machine->gfx[2],
+ sprite - multi * inc,
+ colour,
+ fx,fy,
+ x,y + mult * multi,
+ cliprect,TRANSPARENCY_PEN,0);
+ multi--;
+ }
+ }
+}
+
+/******************************************************************************/
+
+VIDEO_UPDATE( stadhero )
+{
+ flipscreen=stadhero_pf2_control_0[0]&0x80;
+ tilemap_set_flip(ALL_TILEMAPS,flipscreen ? (TILEMAP_FLIPY | TILEMAP_FLIPX) : 0);
+ tilemap_set_scrollx( pf2_tilemap,0, stadhero_pf2_control_1[0] );
+ tilemap_set_scrolly( pf2_tilemap,0, stadhero_pf2_control_1[1] );
+
+ tilemap_draw(bitmap,cliprect,pf2_tilemap,0,0);
+ draw_sprites(machine, bitmap,cliprect,0x00,0x00);
+ tilemap_draw(bitmap,cliprect,pf1_tilemap,0,0);
+ return 0;
+}
+
+/******************************************************************************/
+
+WRITE16_HANDLER( stadhero_pf1_data_w )
+{
+ COMBINE_DATA(&stadhero_pf1_data[offset]);
+ tilemap_mark_tile_dirty(pf1_tilemap,offset);
+}
+
+WRITE16_HANDLER( stadhero_pf2_data_w )
+{
+ COMBINE_DATA(&stadhero_pf2_data[offset]);
+ tilemap_mark_tile_dirty(pf2_tilemap,offset);
+}
+
+WRITE16_HANDLER( stadhero_pf2_control_0_w )
+{
+ COMBINE_DATA(&stadhero_pf2_control_0[offset]);
+}
+
+WRITE16_HANDLER( stadhero_pf2_control_1_w )
+{
+ COMBINE_DATA(&stadhero_pf2_control_1[offset]);
+}
+
+/******************************************************************************/
+
+static TILEMAP_MAPPER( stadhero_scan )
+{
+ /* logical (col,row) -> memory offset */
+ return (col & 0xf) + ((row & 0xf) << 4) + ((row & 0x30) << 4) + ((col & 0x30) << 6);
+}
+
+static TILE_GET_INFO( get_pf2_tile_info )
+{
+ int tile,color;
+
+ tile=stadhero_pf2_data[tile_index];
+ color=tile >> 12;
+ tile=tile&0xfff;
+
+ SET_TILE_INFO(
+ 1,
+ tile,
+ color,
+ 0);
+}
+
+static TILE_GET_INFO( get_pf1_tile_info )
+{
+ int tile=stadhero_pf1_data[tile_index];
+ int color=tile >> 12;
+
+ tile=tile&0xfff;
+ SET_TILE_INFO(
+ 0,
+ tile,
+ color,
+ 0);
+}
+
+VIDEO_START( stadhero )
+{
+ pf1_tilemap = tilemap_create(get_pf1_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN, 8, 8,32,32);
+ pf2_tilemap = tilemap_create(get_pf2_tile_info,stadhero_scan,TILEMAP_TYPE_PEN, 16,16,64,64);
+
+ tilemap_set_transparent_pen(pf1_tilemap,0);
+}
+
+/******************************************************************************/