// license:BSD-3-Clause // copyright-holders:Bryan McPhail, David Graves #include "emu.h" #include "includes/groundfx.h" #include "screen.h" /******************************************************************/ void groundfx_state::video_start() { m_spritelist = std::make_unique(0x4000); /* Hack */ m_hack_cliprect.set(69, 250, 24 + 5, 24 + 44); } /*************************************************************** SPRITE DRAW ROUTINES We draw a series of small tiles ("chunks") together to create each big sprite. The spritemap rom provides the lookup table for this. The game hardware looks up 16x16 sprite chunks from the spritemap rom, creating a 64x64 sprite like this: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 (where the number is the word offset into the spritemap rom). It can also create 32x32 sprites. NB: unused portions of the spritemap rom contain hex FF's. It is a useful coding check to warn in the log if these are being accessed. [They can be inadvertently while spriteram is being tested, take no notice of that.] Heavy use is made of sprite zooming. *** Sprite table layout (4 long words per entry) ------------------------------------------ 0 | ........ x....... ........ ........ | Flip X 0 | ........ .xxxxxxx ........ ........ | ZoomX 0 | ........ ........ .xxxxxxx xxxxxxxx | Sprite Tile | | 2 | ........ ....xx.. ........ ........ | Sprite/tile priority [*] 2 | ........ ......xx xxxxxx.. ........ | Palette bank 2 | ........ ........ ......xx xxxxxxxx | X position | | 3 | ........ .....x.. ........ ........ | Sprite size (0=32x32, 1=64x64) 3 | ........ ......x. ........ ........ | Flip Y 3 | ........ .......x xxxxxx.. ........ | ZoomY 3 | ........ ........ ......xx xxxxxxxx | Y position ------------------------------------------ [* 00=over BG0, 01=BG1, 10=BG2, 11=BG3 ] [or 00=over BG1, 01=BG2, 10=BG3, 11=BG3 ] ***************************************************************/ void groundfx_state::draw_sprites(screen_device &screen, bitmap_ind16 &bitmap,const rectangle &cliprect,int do_hack,int x_offs,int y_offs) { uint32_t *spriteram32 = m_spriteram; uint16_t *spritemap = (uint16_t *)memregion("user1")->base(); int offs, data, tilenum, color, flipx, flipy; int x, y, priority, dblsize, curx, cury; int sprites_flipscreen = 0; int zoomx, zoomy, zx, zy; int sprite_chunk,map_offset,code,j,k,px,py; int dimension,total_chunks; static const int primasks[4] = {0xffff, 0xfffc, 0xfff0, 0xff00 }; /* pdrawgfx() needs us to draw sprites front to back, so we have to build a list while processing sprite ram and then draw them all at the end */ struct gfx_tempsprite *sprite_ptr = m_spritelist.get(); for (offs = (m_spriteram.bytes()/4-4);offs >= 0;offs -= 4) { data = spriteram32[offs+0]; flipx = (data & 0x00800000) >> 23; zoomx = (data & 0x007f0000) >> 16; tilenum = (data & 0x00007fff); data = spriteram32[offs+2]; priority = (data & 0x000c0000) >> 18; color = (data & 0x0003fc00) >> 10; x = (data & 0x000003ff); data = spriteram32[offs+3]; dblsize = (data & 0x00040000) >> 18; flipy = (data & 0x00020000) >> 17; zoomy = (data & 0x0001fc00) >> 10; y = (data & 0x000003ff); // color |= (0x100 + (priority << 6)); /* priority bits select color bank */ color /= 2; /* as sprites are 5bpp */ flipy = !flipy; y = (-y &0x3ff); if (!tilenum) continue; flipy = !flipy; zoomx += 1; zoomy += 1; y += y_offs; /* treat coords as signed */ if (x>0x340) x -= 0x400; if (y>0x340) y -= 0x400; x -= x_offs; dimension = ((dblsize*2) + 2); // 2 or 4 total_chunks = ((dblsize*3) + 1) << 2; // 4 or 16 map_offset = tilenum << 2; { for (sprite_chunk=0;sprite_chunkgfx = 0; sprite_ptr->code = code; sprite_ptr->color = color; sprite_ptr->flipx = !flipx; sprite_ptr->flipy = flipy; sprite_ptr->x = curx; sprite_ptr->y = cury; sprite_ptr->zoomx = zx << 12; sprite_ptr->zoomy = zy << 12; sprite_ptr->pri = priority; sprite_ptr++; } } } /* this happens only if primsks != nullptr */ while (sprite_ptr != m_spritelist.get()) { const rectangle *clipper; sprite_ptr--; if (do_hack && sprite_ptr->pri==1 && sprite_ptr->y<100) clipper=&m_hack_cliprect; else clipper=&cliprect; m_gfxdecode->gfx(sprite_ptr->gfx)->prio_zoom_transpen(bitmap,*clipper, sprite_ptr->code, sprite_ptr->color, sprite_ptr->flipx,sprite_ptr->flipy, sprite_ptr->x,sprite_ptr->y, sprite_ptr->zoomx,sprite_ptr->zoomy, screen.priority(),primasks[sprite_ptr->pri],0); } } /************************************************************** SCREEN REFRESH **************************************************************/ uint32_t groundfx_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { address_space &space = machine().dummy_space(); uint8_t layer[5]; uint8_t scclayer[3]; uint16_t priority; m_tc0100scn->tilemap_update(); m_tc0480scp->tilemap_update(); priority = m_tc0480scp->get_bg_priority(); layer[0] = (priority & 0xf000) >> 12; /* tells us which bg layer is bottom */ layer[1] = (priority & 0x0f00) >> 8; layer[2] = (priority & 0x00f0) >> 4; layer[3] = (priority & 0x000f) >> 0; /* tells us which is top */ layer[4] = 4; /* text layer always over bg layers */ scclayer[0] = m_tc0100scn->bottomlayer(); scclayer[1] = scclayer[0]^1; scclayer[2] = 2; screen.priority().fill(0, cliprect); bitmap.fill(0, cliprect); /* wrong color? */ m_tc0100scn->tilemap_draw(screen, bitmap, cliprect, scclayer[0], TILEMAP_DRAW_OPAQUE, 0); m_tc0100scn->tilemap_draw(screen, bitmap, cliprect, scclayer[1], 0, 0); /* BIG HACK! The rear view mirror is a big priority trick - the text layer of TC0100SCN is used as a stencil to display the bottom layer of TC0480SCP and a particular sprite priority. These never appear outside of the stencil. I'm not sure how the game turns this effect on/off (the 480 layer is used normally in the frontend of the game). I haven't implemented it properly yet, instead I'm doing a hacky cliprect around the rearview and drawing it's contents the usual way. */ if (m_tc0100scn->long_r(space, 0x4090 / 4, 0xffffffff) || m_tc0480scp->long_r(space, 0x20 / 4, 0xffffffff) == 0x240866) /* Anything in text layer - really stupid hack */ { m_tc0480scp->tilemap_draw(screen, bitmap, cliprect, layer[1], 0, 2); m_tc0480scp->tilemap_draw(screen, bitmap, cliprect, layer[2], 0, 4); m_tc0480scp->tilemap_draw(screen, bitmap, cliprect, layer[3], 0, 8); //m_tc0100scn->tilemap_draw(screen, bitmap, cliprect, 0, scclayer[2], 0, 0); if (m_tc0480scp->long_r(space, 0x20 / 4, 0xffffffff) != 0x240866) /* Stupid hack for start of race */ m_tc0480scp->tilemap_draw(screen, bitmap, m_hack_cliprect, layer[0], 0, 0); draw_sprites(screen, bitmap, cliprect, 1, 44, -574); } else { m_tc0480scp->tilemap_draw(screen, bitmap, cliprect, layer[0], 0, 1); m_tc0480scp->tilemap_draw(screen, bitmap, cliprect, layer[1], 0, 2); m_tc0480scp->tilemap_draw(screen, bitmap, cliprect, layer[2], 0, 4); m_tc0480scp->tilemap_draw(screen, bitmap, cliprect, layer[3], 0, 8); m_tc0100scn->tilemap_draw(screen, bitmap, cliprect, scclayer[2], 0, 0); draw_sprites(screen, bitmap, cliprect, 0, 44, -574); } m_tc0480scp->tilemap_draw(screen, bitmap, cliprect, layer[4], 0, 0); /* TC0480SCP text layer */ return 0; }