// license:BSD-3-Clause // copyright-holders:Aaron Giles /*************************************************************************** Atari Xybots hardware ****************************************************************************/ #include "emu.h" #include "machine/atarigen.h" #include "video/atarimo.h" #include "includes/xybots.h" /************************************* * * Tilemap callbacks * *************************************/ TILE_GET_INFO_MEMBER(xybots_state::get_alpha_tile_info) { uint16_t data = m_alpha_tilemap->basemem_read(tile_index); int code = data & 0x3ff; int color = (data >> 12) & 7; int opaque = data & 0x8000; SET_TILE_INFO_MEMBER(2, code, color, opaque ? TILE_FORCE_LAYER0 : 0); } TILE_GET_INFO_MEMBER(xybots_state::get_playfield_tile_info) { uint16_t data = m_playfield_tilemap->basemem_read(tile_index); int code = data & 0x1fff; int color = (data >> 11) & 0x0f; SET_TILE_INFO_MEMBER(0, code, color, (data >> 15) & 1); } /************************************* * * Video system start * *************************************/ const atari_motion_objects_config xybots_state::s_mob_config = { 1, /* index to which gfx system */ 1, /* number of motion object banks */ 0, /* are the entries linked? */ 0, /* are the entries split? */ 0, /* render in reverse order? */ 0, /* render in swapped X/Y order? */ 0, /* does the neighbor bit affect the next object? */ 0, /* pixels per SLIP entry (0 for no-slip) */ 0, /* pixel offset for SLIPs */ 0, /* maximum number of links to visit/scanline (0=all) */ 0x100, /* base palette entry */ 0x300, /* maximum number of colors */ 0, /* transparent pen index */ {{ 0x3f }}, /* mask for the link (dummy) */ {{ 0x3fff,0,0,0 }}, /* mask for the code index */ {{ 0,0,0,0x000f }}, /* mask for the color */ {{ 0,0,0,0xff80 }}, /* mask for the X position */ {{ 0,0,0xff80,0 }}, /* mask for the Y position */ {{ 0 }}, /* mask for the width, in tiles*/ {{ 0,0,0x0007,0 }}, /* mask for the height, in tiles */ {{ 0x8000,0,0,0 }}, /* mask for the horizontal flip */ {{ 0 }}, /* mask for the vertical flip */ {{ 0,0x000f,0,0 }}, /* mask for the priority */ {{ 0 }}, /* mask for the neighbor */ {{ 0 }}, /* mask for absolute coordinates */ {{ 0 }}, /* mask for the special value */ 0 /* resulting value to indicate "special" */ }; /************************************* * * Main refresh * *************************************/ uint32_t xybots_state::screen_update_xybots(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { // start drawing m_mob->draw_async(cliprect); /* draw the playfield */ m_playfield_tilemap->draw(screen, bitmap, cliprect, 0, 0); // draw and merge the MO bitmap_ind16 &mobitmap = m_mob->bitmap(); for (const sparse_dirty_rect *rect = m_mob->first_dirty_rect(cliprect); rect != nullptr; rect = rect->next()) for (int y = rect->top(); y <= rect->bottom(); y++) { uint16_t *mo = &mobitmap.pix16(y); uint16_t *pf = &bitmap.pix16(y); for (int x = rect->left(); x <= rect->right(); x++) if (mo[x] != 0xffff) { /* verified via schematics: PRIEN = ~(~MOPIX3 & ~MOPIX2 & ~MOPIX1) = (MOPIX3-0 > 1) if (PRIEN) PF/MO = (~MOPRI3-0 > PFCOL3-0) else PF/MO = (~MOPRI3-0 >= PFCOL3-0) if (PF/MO | ~(PRIEN & MOCOL3)) GPC(P3-0) = PFPIX3-0 else GPC(P3-0) = ~MOCOL3-0 */ int mopriority = (mo[x] >> atari_motion_objects_device::PRIORITY_SHIFT) ^ 15; int pfcolor = (pf[x] >> 4) & 0x0f; int prien = ((mo[x] & 0x0f) > 1); if (prien) { if (mopriority <= pfcolor) { /* this first case doesn't make sense from the schematics, but it has */ /* the correct effect */ if (mo[x] & 0x80) pf[x] = (mo[x] ^ 0x2f0) & atari_motion_objects_device::DATA_MASK; else pf[x] = mo[x] & atari_motion_objects_device::DATA_MASK; } } else { if (mopriority < pfcolor) pf[x] = mo[x] & atari_motion_objects_device::DATA_MASK; } } } /* add the alpha on top */ m_alpha_tilemap->draw(screen, bitmap, cliprect, 0, 0); return 0; }