diff options
Diffstat (limited to 'src/mame/video/stadhero.c')
-rw-r--r-- | src/mame/video/stadhero.c | 169 |
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); +} + +/******************************************************************************/ |