// license:BSD-3-Clause // copyright-holders:Aaron Giles, Phil Bennett /*************************************************************************** Atari Cyberstorm hardware ****************************************************************************/ #include "emu.h" #include "includes/cybstorm.h" /************************************* * * Tilemap callbacks * *************************************/ TILE_GET_INFO_MEMBER(cybstorm_state::get_alpha_tile_info) { uint16_t data = m_vad->alpha().basemem_read(tile_index); int code = ((data & 0x400) ? (m_alpha_tile_bank * 0x400) : 0) + (data & 0x3ff); int color = (data >> 11) & 0x0f; int opaque = data & 0x8000; SET_TILE_INFO_MEMBER(2, code, color, opaque ? TILEMAP_PIXEL_LAYER0 : 0); } TILE_GET_INFO_MEMBER(cybstorm_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) & 0xff; int code = data1; int color = 8 + (data2 & 0x07); SET_TILE_INFO_MEMBER(0, code, color, data2 & 0x80 ? TILE_FLIPX : 0); tileinfo.category = (data2 >> 4) & 3; } TILE_GET_INFO_MEMBER(cybstorm_state::get_playfield2_tile_info) { uint16_t data1 = m_vad->playfield2().basemem_read(tile_index); uint16_t data2 = m_vad->playfield2().extmem_read(tile_index) >> 8; int code = data1; int color = data2 & 0x07; SET_TILE_INFO_MEMBER(0, code, color, data2 & 0x80 ? TILE_FLIPX : 0); tileinfo.category = (data2 >> 4) & 3; } TILEMAP_MAPPER_MEMBER(cybstorm_state::playfield_scan) { int bank = 1 - (col / (num_cols / 2)); return bank * (num_rows * num_cols / 2) + row * (num_cols / 2) + (col % (num_cols / 2)); } /************************************* * * Video system start * *************************************/ const atari_motion_objects_config cybstorm_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? */ 1, /* 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) */ 0x1000, /* base palette entry */ 0x1000, /* maximum number of colors */ 0, /* transparent pen index */ {{ 0x03ff,0,0,0 }}, /* mask for the link */ {{ 0,0x7fff,0,0 }, { 0x3c00,0,0,0 }}, /* 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 */ {{ 0,0,0x0070,0 }}, /* 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" */ }; void cybstorm_state::video_start() { /* motion objects have 256 color granularity */ m_gfxdecode->gfx(1)->set_granularity(256); } /************************************* * * Main refresh * *************************************/ uint32_t cybstorm_state::screen_update_cybstorm(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { m_vad->mob().draw_async(cliprect); /* draw the playfield */ bitmap_ind8 &priority_bitmap = screen.priority(); priority_bitmap.fill(0, cliprect); m_vad->playfield().draw(screen, bitmap, cliprect, 0, 0x00); m_vad->playfield().draw(screen, bitmap, cliprect, 1, 0x01); m_vad->playfield().draw(screen, bitmap, cliprect, 2, 0x02); m_vad->playfield().draw(screen, bitmap, cliprect, 3, 0x03); m_vad->playfield2().draw(screen, bitmap, cliprect, 0, 0x80); m_vad->playfield2().draw(screen, bitmap, cliprect, 1, 0x84); m_vad->playfield2().draw(screen, bitmap, cliprect, 2, 0x88); m_vad->playfield2().draw(screen, bitmap, cliprect, 3, 0x8c); /* 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->min_y; y <= rect->max_y; y++) { uint16_t *mo = &mobitmap.pix16(y); uint16_t *pf = &bitmap.pix16(y); uint8_t *pri = &priority_bitmap.pix8(y); for (int x = rect->min_x; x <= rect->max_x; x++) if (mo[x]) { int mopriority = mo[x] >> atari_motion_objects_device::PRIORITY_SHIFT; /* upper bit of MO priority signals special rendering and doesn't draw anything */ if (mopriority & 4) { if ((mopriority & 0x3) != 0) continue; } /* foreground playfield case */ if (pri[x] & 0x80) { int pfpriority = (pri[x] >> 2) & 3; if (mopriority > pfpriority) pf[x] = (mo[x] & atari_motion_objects_device::DATA_MASK) | 0x1000; } /* background playfield case */ else { int pfpriority = pri[x] & 3; /* playfield priority 3 always wins */ if (pfpriority == 3) ; /* otherwise, MOs get shown */ else pf[x] = (mo[x] & atari_motion_objects_device::DATA_MASK) | 0x1000; } /* don't erase yet -- we need to make another pass later */ } } /* now go back and process the upper bit of MO priority */ for (const sparse_dirty_rect *rect = m_vad->mob().first_dirty_rect(cliprect); rect != nullptr; rect = rect->next()) for (int y = rect->min_y; y <= rect->max_y; y++) { uint16_t *mo = &mobitmap.pix16(y); uint16_t *pf = &bitmap.pix16(y); int count = 0; for (int x = rect->min_x; x <= rect->max_x || (count && x < bitmap.width()); x++) { const uint16_t START_MARKER = ((4 << atari_motion_objects_device::PRIORITY_SHIFT) | 3); const uint16_t END_MARKER = ((4 << atari_motion_objects_device::PRIORITY_SHIFT) | 7); const uint16_t MASK = ((4 << atari_motion_objects_device::PRIORITY_SHIFT) | 0x3f); // TODO: Stain pixels should not overlap sprites! if ((mo[x] & MASK) == START_MARKER) { count++; } if (count) { // Only applies to PF pixels if ((pf[x] & 0x1000) == 0) { pf[x] |= 0x2000; } } if ((mo[x] & MASK) == END_MARKER) { count--; } /* erase behind ourselves */ mo[x] = 0; } } /* add the alpha on top */ m_vad->alpha().draw(screen, bitmap, cliprect, 0, 0); return 0; }