/*************************************************************************** video.c Functions to emulate the video hardware of the machine. ***************************************************************************/ #include "driver.h" #include UINT8 *bublbobl_objectram; size_t bublbobl_objectram_size; int bublbobl_video_enable; VIDEO_UPDATE( bublbobl ) { int offs; int sx,sy,xc,yc; int gfx_num,gfx_attr,gfx_offs; const UINT8 *prom_line; /* Bubble Bobble doesn't have a real video RAM. All graphics (characters */ /* and sprites) are stored in the same memory region, and information on */ /* the background character columns is stored in the area dd00-dd3f */ /* This clears & redraws the entire screen each pass */ fillbitmap(bitmap,machine->pens[255],cliprect); if (!bublbobl_video_enable) return 0; sx = 0; for (offs = 0;offs < bublbobl_objectram_size;offs += 4) { /* skip empty sprites */ /* this is dword aligned so the UINT32 * cast shouldn't give problems */ /* on any architecture */ if (*(UINT32 *)(&bublbobl_objectram[offs]) == 0) continue; gfx_num = bublbobl_objectram[offs + 1]; gfx_attr = bublbobl_objectram[offs + 3]; prom_line = memory_region(REGION_PROMS) + 0x80 + ((gfx_num & 0xe0) >> 1); gfx_offs = ((gfx_num & 0x1f) * 0x80); if ((gfx_num & 0xa0) == 0xa0) gfx_offs |= 0x1000; sy = -bublbobl_objectram[offs + 0]; for (yc = 0;yc < 32;yc++) { if (prom_line[yc/2] & 0x08) continue; /* NEXT */ if (!(prom_line[yc/2] & 0x04)) /* next column */ { sx = bublbobl_objectram[offs + 2]; if (gfx_attr & 0x40) sx -= 256; } for (xc = 0;xc < 2;xc++) { int goffs,code,color,flipx,flipy,x,y; goffs = gfx_offs + xc * 0x40 + (yc & 7) * 0x02 + (prom_line[yc/2] & 0x03) * 0x10; code = videoram[goffs] + 256 * (videoram[goffs + 1] & 0x03) + 1024 * (gfx_attr & 0x0f); color = (videoram[goffs + 1] & 0x3c) >> 2; flipx = videoram[goffs + 1] & 0x40; flipy = videoram[goffs + 1] & 0x80; x = sx + xc * 8; y = (sy + yc * 8) & 0xff; if (flip_screen) { x = 248 - x; y = 248 - y; flipx = !flipx; flipy = !flipy; } drawgfx(bitmap,machine->gfx[0], code, color, flipx,flipy, x,y, cliprect,TRANSPARENCY_PEN,15); } } sx += 16; } return 0; }