// license:BSD-3-Clause // copyright-holders:Aaron Giles /*************************************************************************** Atari Shuuz hardware ****************************************************************************/ #include "emu.h" #include "includes/shuuz.h" /************************************* * * Tilemap callbacks * *************************************/ TILE_GET_INFO_MEMBER(shuuz_state::get_playfield_tile_info) { uint16_t data1 = m_vad->playfield().basemem_read(tile_index); uint16_t data2 = m_vad->playfield().extmem_read(tile_index) >> 8; int code = data1 & 0x3fff; int color = data2 & 0x0f; SET_TILE_INFO_MEMBER(0, code, color, (data1 >> 15) & 1); } /************************************* * * Video system start * *************************************/ const atari_motion_objects_config shuuz_state::s_mob_config = { 1, /* index to which gfx system */ 1, /* number of motion object banks */ 1, /* 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? */ 8, /* pixels per SLIP entry (0 for no-slip) */ 0, /* pixel offset for SLIPs */ 0, /* maximum number of links to visit/scanline (0=all) */ 0x000, /* base palette entry */ 0x100, /* maximum number of colors */ 0, /* transparent pen index */ {{ 0x00ff,0,0,0 }}, /* mask for the link */ {{ 0,0x7fff,0,0 }}, /* mask for the code index */ {{ 0,0,0x000f,0 }}, /* mask for the color */ {{ 0,0,0xff80,0 }}, /* mask for the X position */ {{ 0,0,0,0xff80 }}, /* mask for the Y position */ {{ 0,0,0,0x0070 }}, /* mask for the width, in tiles*/ {{ 0,0,0,0x0007 }}, /* mask for the height, in tiles */ {{ 0,0x8000,0,0 }}, /* mask for the horizontal flip */ {{ 0 }}, /* mask for the vertical flip */ {{ 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 shuuz_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { // start drawing m_vad->mob().draw_async(cliprect); /* draw the playfield */ m_vad->playfield().draw(screen, bitmap, cliprect, 0, 0); // draw and merge the MO bitmap_ind16 &mobitmap = m_vad->mob().bitmap(); for (const sparse_dirty_rect *rect = m_vad->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 from the GALs on the real PCB; equations follow * * --- O13 is 1 if (PFS7-4 == 0xf) * O13=PFS6*PFS7*(PFS5&PFS4) * * --- PF/M is 1 if MOs have priority, or 0 if playfield has priority * MO/PF=!PFS7*!(LBD7&LBD6)*!M1*!O13 * +!PFS7*!(LBD7&LBD6)*!M2*!O13 * +!PFS7*!(LBD7&LBD6)*!M3*!O13 * +PFS7*(LBD7&LBD6)*!M1*!O13 * +PFS7*(LBD7&LBD6)*!M2*!O13 * +PFS7*(LBD7&LBD6)*!M3*!O13 * */ int o13 = ((pf[x] & 0xf0) == 0xf0); int mopf = 0; /* compute the MO/PF signal */ if ((!(pf[x] & 0x80) && ((mo[x] & 0xc0) != 0xc0) && ((mo[x] & 0x0e) != 0x00) && !o13) || ((pf[x] & 0x80) && ((mo[x] & 0xc0) == 0xc0) && ((mo[x] & 0x0e) != 0x00) && !o13)) mopf = 1; /* if MO/PF is 1, we draw the MO */ if (mopf) pf[x] = mo[x]; } } return 0; }