// license:BSD-3-Clause // copyright-holders:Aaron Giles /*************************************************************************** Atari Escape hardware ****************************************************************************/ #include "emu.h" #include "includes/eprom.h" /************************************* * * Palette * *************************************/ void eprom_state::update_palette() { int color; for (color = 0; color < 0x800; ++color) { int i, r, g, b; uint16_t const data = m_paletteram[color]; /* FIXME this is only a very crude approximation of the palette output. * The circuit involves a dozen transistors and probably has an output * which is quite different from this. * This is, however, good enough to match the video and description * of MAMETesters bug #02677. */ i = (((data >> 12) & 15) + 1) * (4 - m_screen_intensity); if (i < 0) i = 0; r = ((data >> 8) & 15) * i / 4; g = ((data >> 4) & 15) * i / 4; b = ((data >> 0) & 15) * i / 4; m_palette->set_pen_color(color, r, g, b); } } /************************************* * * Tilemap callbacks * *************************************/ TILE_GET_INFO_MEMBER(eprom_state::get_alpha_tile_info) { uint16_t data = m_alpha_tilemap->basemem_read(tile_index); int code = data & 0x3ff; int color = ((data >> 10) & 0x0f) | ((data >> 9) & 0x20); int opaque = data & 0x8000; SET_TILE_INFO_MEMBER(1, code, color, opaque ? TILE_FORCE_LAYER0 : 0); } TILE_GET_INFO_MEMBER(eprom_state::get_playfield_tile_info) { uint16_t data1 = m_playfield_tilemap->basemem_read(tile_index); uint16_t data2 = m_playfield_tilemap->extmem_read(tile_index) >> 8; int code = data1 & 0x7fff; int color = 0x10 + (data2 & 0x0f); SET_TILE_INFO_MEMBER(0, code, color, (data1 >> 15) & 1); } TILE_GET_INFO_MEMBER(eprom_state::guts_get_playfield_tile_info) { uint16_t data1 = m_playfield_tilemap->basemem_read(tile_index); uint16_t data2 = m_playfield_tilemap->extmem_read(tile_index) >> 8; int code = data1 & 0x7fff; int color = 0x10 + (data2 & 0x0f); SET_TILE_INFO_MEMBER(2, code, color, (data1 >> 15) & 1); } /************************************* * * Video system start * *************************************/ const atari_motion_objects_config eprom_state::s_mob_config = { 0, /* 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) */ 0x100, /* base palette entry */ 0x100, /* maximum number of colors */ 0, /* transparent pen index */ {{ 0x03ff,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 */ {{ 0,0,0,0x0008 }}, /* 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" */ }; VIDEO_START_MEMBER(eprom_state,eprom) { /* save states */ save_item(NAME(m_screen_intensity)); save_item(NAME(m_video_disable)); } const atari_motion_objects_config eprom_state::s_guts_mob_config = { 0, /* 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) */ 0x100, /* base palette entry */ 0x100, /* maximum number of colors */ 0, /* transparent pen index */ {{ 0x03ff,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*/ {{ 0,0,0,0x000f }}, /* 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" */ }; VIDEO_START_MEMBER(eprom_state,guts) { /* save states */ save_item(NAME(m_screen_intensity)); save_item(NAME(m_video_disable)); } /************************************* * * Periodic scanline updater * *************************************/ void eprom_state::scanline_update(screen_device &screen, int scanline) { /* update the playfield */ if (scanline == 0) { int xscroll = (m_alpha_tilemap->basemem_read(0x780) >> 7) & 0x1ff; int yscroll = (m_alpha_tilemap->basemem_read(0x781) >> 7) & 0x1ff; m_playfield_tilemap->set_scrollx(0, xscroll); m_playfield_tilemap->set_scrolly(0, yscroll); m_mob->set_scroll(xscroll, yscroll); } } /************************************* * * Main refresh * *************************************/ uint32_t eprom_state::screen_update_eprom(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { if (m_video_disable) { bitmap.fill(m_palette->black_pen(), cliprect); return 0; } update_palette(); // 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 from the GALs on the real PCB; equations follow * * --- FORCEMC0 forces 3 bits of the MO color to 0 under some conditions * FORCEMC0=!PFX3*PFX4*PFX5*!MPR0 * +!PFX3*PFX5*!MPR1 * +!PFX3*PFX4*!MPR0*!MPR1 * * --- SHADE selects an alternate color bank for the playfield * !SHADE=!MPX0 * +MPX1 * +MPX2 * +MPX3 * +!MPX4*!MPX5*!MPX6*!MPX7 * +FORCEMC0 * * --- PF/M is 1 if playfield has priority, or 0 if MOs have priority * !PF/M=MPR0*MPR1 * +PFX3 * +!PFX4*MPR1 * +!PFX5*MPR1 * +!PFX5*MPR0 * +!PFX4*!PFX5*!MPR0*!MPR1 * * --- M7 is passed as the upper MO bit to the GPC ASIC * M7=MPX0*!MPX1*!MPX2*!MPX3 * * --- CL10-9 are outputs from the GPC, specifying which layer to render * CL10 = 1 if pf * CL9 = 1 if mo * * --- CRA10 is the 0x200 bit of the color RAM index; it comes directly from the GPC * CRA10 = CL10 * * --- CRA9 is the 0x100 bit of the color RAM index; is comes directly from the GPC * or if the SHADE flag is set, it affects the playfield color bank * CRA9 = SHADE*CL10 * +CL9 * * --- CRA8-1 are the low 8 bits of the color RAM index; set as expected */ int mopriority = (mo[x] >> atari_motion_objects_device::PRIORITY_SHIFT) & 7; int pfpriority = (pf[x] >> 4) & 3; int forcemc0 = 0, shade = 1, pfm = 1, m7 = 0; /* upper bit of MO priority signals special rendering and doesn't draw anything */ if (mopriority & 4) continue; /* compute the FORCEMC signal */ if (!(pf[x] & 8)) { if (((pfpriority == 3) && !(mopriority & 1)) || ((pfpriority & 2) && !(mopriority & 2)) || ((pfpriority & 1) && (mopriority == 0))) forcemc0 = 1; } /* compute the SHADE signal */ if (((mo[x] & 0x0f) != 1) || ((mo[x] & 0xf0) == 0) || forcemc0) shade = 0; /* compute the PF/M signal */ if ((mopriority == 3) || (pf[x] & 8) || (!(pfpriority & 1) && (mopriority & 2)) || (!(pfpriority & 2) && (mopriority & 2)) || (!(pfpriority & 2) && (mopriority & 1)) || ((pfpriority == 0) && (mopriority == 0))) pfm = 0; /* compute the M7 signal */ if ((mo[x] & 0x0f) == 1) m7 = 1; /* PF/M and M7 go in the GPC ASIC and select playfield or MO layers */ if (!pfm && !m7) { if (!forcemc0) pf[x] = mo[x] & atari_motion_objects_device::DATA_MASK; else pf[x] = mo[x] & atari_motion_objects_device::DATA_MASK & ~0x70; } else { if (shade) pf[x] |= 0x100; if (m7) pf[x] |= 0x080; } } } /* add the alpha on top */ m_alpha_tilemap->draw(screen, bitmap, cliprect, 0, 0); /* now go back and process the upper bit of MO priority */ 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) { int mopriority = mo[x] >> atari_motion_objects_device::PRIORITY_SHIFT; /* upper bit of MO priority might mean palette kludges */ if (mopriority & 4) { /* if bit 2 is set, start setting high palette bits */ if (mo[x] & 2) m_mob->apply_stain(bitmap, pf, mo, x, y); } } } return 0; } uint32_t eprom_state::screen_update_guts(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { if (m_video_disable) { bitmap.fill(m_palette->black_pen(), cliprect); return 0; } update_palette(); // 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) { int mopriority = (mo[x] >> atari_motion_objects_device::PRIORITY_SHIFT) & 7; int pfpriority = (pf[x] >> 5) & 3; /* upper bit of MO priority signals special rendering and doesn't draw anything */ if (mopriority & 4) continue; /* check the priority */ if (!(pf[x] & 8) || mopriority >= pfpriority) pf[x] = mo[x] & atari_motion_objects_device::DATA_MASK; } } /* add the alpha on top */ m_alpha_tilemap->draw(screen, bitmap, cliprect, 0, 0); /* now go back and process the upper bit of MO priority */ 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) { int mopriority = mo[x] >> atari_motion_objects_device::PRIORITY_SHIFT; /* upper bit of MO priority might mean palette kludges */ if (mopriority & 4) { /* if bit 2 is set, start setting high palette bits */ if (mo[x] & 2) m_mob->apply_stain(bitmap, pf, mo, x, y); } } } return 0; }