/*************************************************************************** Atari Escape hardware ****************************************************************************/ #include "emu.h" #include "video/atarimo.h" #include "includes/eprom.h" /************************************* * * Palette * *************************************/ static void update_palette(running_machine &machine) { eprom_state *state = machine.driver_data(); int color; for (color = 0; color < 0x800; ++color) { int i, r, g, b; UINT16 const data = machine.generic.paletteram.u16[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 - state->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; palette_set_color_rgb(machine, color, r, g, b); } } /************************************* * * Tilemap callbacks * *************************************/ static TILE_GET_INFO( get_alpha_tile_info ) { eprom_state *state = machine.driver_data(); UINT16 data = state->m_alpha[tile_index]; int code = data & 0x3ff; int color = ((data >> 10) & 0x0f) | ((data >> 9) & 0x20); int opaque = data & 0x8000; SET_TILE_INFO(1, code, color, opaque ? TILE_FORCE_LAYER0 : 0); } static TILE_GET_INFO( get_playfield_tile_info ) { eprom_state *state = machine.driver_data(); UINT16 data1 = state->m_playfield[tile_index]; UINT16 data2 = state->m_playfield_upper[tile_index] >> 8; int code = data1 & 0x7fff; int color = 0x10 + (data2 & 0x0f); SET_TILE_INFO(0, code, color, (data1 >> 15) & 1); } static TILE_GET_INFO( guts_get_playfield_tile_info ) { eprom_state *state = machine.driver_data(); UINT16 data1 = state->m_playfield[tile_index]; UINT16 data2 = state->m_playfield_upper[tile_index] >> 8; int code = data1 & 0x7fff; int color = 0x10 + (data2 & 0x0f); SET_TILE_INFO(2, code, color, (data1 >> 15) & 1); } /************************************* * * Video system start * *************************************/ VIDEO_START( eprom ) { static const atarimo_desc modesc = { 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 }}, /* mask for the graphics bank */ {{ 0,0x7fff,0,0 }}, /* mask for the code index */ {{ 0 }}, /* mask for the upper 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" */ 0 /* callback routine for special entries */ }; eprom_state *state = machine.driver_data(); /* initialize the playfield */ state->m_playfield_tilemap = tilemap_create(machine, get_playfield_tile_info, tilemap_scan_cols, 8,8, 64,64); /* initialize the motion objects */ atarimo_init(machine, 0, &modesc); /* initialize the alphanumerics */ state->m_alpha_tilemap = tilemap_create(machine, get_alpha_tile_info, tilemap_scan_rows, 8,8, 64,32); tilemap_set_transparent_pen(state->m_alpha_tilemap, 0); /* save states */ state->save_item(NAME(state->m_screen_intensity)); state->save_item(NAME(state->m_video_disable)); } VIDEO_START( guts ) { static const atarimo_desc modesc = { 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 }}, /* mask for the graphics bank */ {{ 0,0x7fff,0,0 }}, /* mask for the code index */ {{ 0 }}, /* mask for the upper 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" */ 0 /* callback routine for special entries */ }; eprom_state *state = machine.driver_data(); /* initialize the playfield */ state->m_playfield_tilemap = tilemap_create(machine, guts_get_playfield_tile_info, tilemap_scan_cols, 8,8, 64,64); /* initialize the motion objects */ atarimo_init(machine, 0, &modesc); /* initialize the alphanumerics */ state->m_alpha_tilemap = tilemap_create(machine, get_alpha_tile_info, tilemap_scan_rows, 8,8, 64,32); tilemap_set_transparent_pen(state->m_alpha_tilemap, 0); /* save states */ state->save_item(NAME(state->m_screen_intensity)); state->save_item(NAME(state->m_video_disable)); } /************************************* * * Periodic scanline updater * *************************************/ void eprom_scanline_update(screen_device &screen, int scanline) { eprom_state *state = screen.machine().driver_data(); /* update the playfield */ if (scanline == 0) { int xscroll = (state->m_alpha[0x780] >> 7) & 0x1ff; int yscroll = (state->m_alpha[0x781] >> 7) & 0x1ff; tilemap_set_scrollx(state->m_playfield_tilemap, 0, xscroll); tilemap_set_scrolly(state->m_playfield_tilemap, 0, yscroll); atarimo_set_xscroll(0, xscroll); atarimo_set_yscroll(0, yscroll); } } /************************************* * * Main refresh * *************************************/ SCREEN_UPDATE( eprom ) { eprom_state *state = screen->machine().driver_data(); atarimo_rect_list rectlist; bitmap_t *mobitmap; int x, y, r; if (state->m_video_disable) { bitmap_fill(bitmap,cliprect,get_black_pen(screen->machine())); return 0; } update_palette(screen->machine()); /* draw the playfield */ tilemap_draw(bitmap, cliprect, state->m_playfield_tilemap, 0, 0); /* draw and merge the MO */ mobitmap = atarimo_render(0, cliprect, &rectlist); for (r = 0; r < rectlist.numrects; r++, rectlist.rect++) for (y = rectlist.rect->min_y; y <= rectlist.rect->max_y; y++) { UINT16 *mo = (UINT16 *)mobitmap->base + mobitmap->rowpixels * y; UINT16 *pf = (UINT16 *)bitmap->base + bitmap->rowpixels * y; for (x = rectlist.rect->min_x; x <= rectlist.rect->max_x; x++) if (mo[x]) { /* 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] >> ATARIMO_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] & ATARIMO_DATA_MASK; else pf[x] = mo[x] & ATARIMO_DATA_MASK & ~0x70; } else { if (shade) pf[x] |= 0x100; if (m7) pf[x] |= 0x080; } /* don't erase yet -- we need to make another pass later */ } } /* add the alpha on top */ tilemap_draw(bitmap, cliprect, state->m_alpha_tilemap, 0, 0); /* now go back and process the upper bit of MO priority */ rectlist.rect -= rectlist.numrects; for (r = 0; r < rectlist.numrects; r++, rectlist.rect++) for (y = rectlist.rect->min_y; y <= rectlist.rect->max_y; y++) { UINT16 *mo = (UINT16 *)mobitmap->base + mobitmap->rowpixels * y; UINT16 *pf = (UINT16 *)bitmap->base + bitmap->rowpixels * y; for (x = rectlist.rect->min_x; x <= rectlist.rect->max_x; x++) if (mo[x]) { int mopriority = mo[x] >> ATARIMO_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) atarimo_mark_high_palette(bitmap, pf, mo, x, y); } /* erase behind ourselves */ mo[x] = 0; } } return 0; } SCREEN_UPDATE( guts ) { eprom_state *state = screen->machine().driver_data(); atarimo_rect_list rectlist; bitmap_t *mobitmap; int x, y, r; if (state->m_video_disable) { bitmap_fill(bitmap,cliprect,get_black_pen(screen->machine())); return 0; } update_palette(screen->machine()); /* draw the playfield */ tilemap_draw(bitmap, cliprect, state->m_playfield_tilemap, 0, 0); /* draw and merge the MO */ mobitmap = atarimo_render(0, cliprect, &rectlist); for (r = 0; r < rectlist.numrects; r++, rectlist.rect++) for (y = rectlist.rect->min_y; y <= rectlist.rect->max_y; y++) { UINT16 *mo = (UINT16 *)mobitmap->base + mobitmap->rowpixels * y; UINT16 *pf = (UINT16 *)bitmap->base + bitmap->rowpixels * y; for (x = rectlist.rect->min_x; x <= rectlist.rect->max_x; x++) if (mo[x]) { int mopriority = (mo[x] >> ATARIMO_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] & ATARIMO_DATA_MASK; /* don't erase yet -- we need to make another pass later */ } } /* add the alpha on top */ tilemap_draw(bitmap, cliprect, state->m_alpha_tilemap, 0, 0); /* now go back and process the upper bit of MO priority */ rectlist.rect -= rectlist.numrects; for (r = 0; r < rectlist.numrects; r++, rectlist.rect++) for (y = rectlist.rect->min_y; y <= rectlist.rect->max_y; y++) { UINT16 *mo = (UINT16 *)mobitmap->base + mobitmap->rowpixels * y; UINT16 *pf = (UINT16 *)bitmap->base + bitmap->rowpixels * y; for (x = rectlist.rect->min_x; x <= rectlist.rect->max_x; x++) if (mo[x]) { int mopriority = mo[x] >> ATARIMO_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) atarimo_mark_high_palette(bitmap, pf, mo, x, y); } /* erase behind ourselves */ mo[x] = 0; } } return 0; }