/*************************************************************************** Atari ThunderJaws hardware ****************************************************************************/ #include "emu.h" #include "machine/atarigen.h" #include "video/atarimo.h" #include "includes/thunderj.h" /************************************* * * Tilemap callbacks * *************************************/ static TILE_GET_INFO( get_alpha_tile_info ) { thunderj_state *state = machine.driver_data(); UINT16 data = state->m_alpha[tile_index]; int code = ((data & 0x200) ? (state->m_alpha_tile_bank * 0x200) : 0) + (data & 0x1ff); int color = ((data >> 10) & 0x0f) | ((data >> 9) & 0x20); int opaque = data & 0x8000; SET_TILE_INFO(2, code, color, opaque ? TILE_FORCE_LAYER0 : 0); } static TILE_GET_INFO( get_playfield_tile_info ) { thunderj_state *state = machine.driver_data(); UINT16 data1 = state->m_playfield[tile_index]; UINT16 data2 = state->m_playfield_upper[tile_index] & 0xff; int code = data1 & 0x7fff; int color = 0x10 + (data2 & 0x0f); SET_TILE_INFO(0, code, color, (data1 >> 15) & 1); tileinfo->category = (data2 >> 4) & 3; } static TILE_GET_INFO( get_playfield2_tile_info ) { thunderj_state *state = machine.driver_data(); UINT16 data1 = state->m_playfield2[tile_index]; UINT16 data2 = state->m_playfield_upper[tile_index] >> 8; int code = data1 & 0x7fff; int color = data2 & 0x0f; SET_TILE_INFO(0, code, color, (data1 >> 15) & 1); tileinfo->category = (data2 >> 4) & 3; } /************************************* * * Video system start * *************************************/ VIDEO_START( thunderj ) { static const atarimo_desc modesc = { 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) */ 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 */ {{ 0,0x8000,0,0 }}, /* 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" */ NULL /* callback routine for special entries */ }; thunderj_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 second playfield */ state->m_playfield2_tilemap = tilemap_create(machine, get_playfield2_tile_info, tilemap_scan_cols, 8,8, 64,64); tilemap_set_transparent_pen(state->m_playfield2_tilemap, 0); /* 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); } /************************************* * * Main refresh * *************************************/ SCREEN_UPDATE( thunderj ) { thunderj_state *state = screen->machine().driver_data(); bitmap_t *priority_bitmap = screen->machine().priority_bitmap; atarimo_rect_list rectlist; bitmap_t *mobitmap; int x, y, r; /* draw the playfield */ bitmap_fill(priority_bitmap, cliprect, 0); tilemap_draw(bitmap, cliprect, state->m_playfield_tilemap, 0, 0x00); tilemap_draw(bitmap, cliprect, state->m_playfield_tilemap, 1, 0x01); tilemap_draw(bitmap, cliprect, state->m_playfield_tilemap, 2, 0x02); tilemap_draw(bitmap, cliprect, state->m_playfield_tilemap, 3, 0x03); tilemap_draw(bitmap, cliprect, state->m_playfield2_tilemap, 0, 0x80); tilemap_draw(bitmap, cliprect, state->m_playfield2_tilemap, 1, 0x84); tilemap_draw(bitmap, cliprect, state->m_playfield2_tilemap, 2, 0x88); tilemap_draw(bitmap, cliprect, state->m_playfield2_tilemap, 3, 0x8c); /* 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; UINT8 *pri = (UINT8 *)priority_bitmap->base + priority_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 * * --- PF/M is 1 if playfield has priority, or 0 if MOs have priority * PF/M=MPX0*!MPX1*!MPX2*!MPX3*!MPX4*!MPX5*!MPX6*!MPX7 * +PFX3*PFX8*PFX9*!MPR0 * +PFX3*PFX8*!MPR0*!MPR1 * +PFX3*PFX9*!MPR1 * * --- CS1 is 1 if the playfield should be displayed * CS1=PF/M*!ALBG*!APIX0*!APIX1 * +!MPX0*!MPX1*!MPX2*!MPX3*!ALBG*!APIX0*!APIX1 * * --- CS0 is 1 if the MOs should be displayed * CS0=!PF/M*MPX0*!ALBG*!APIX0*!APIX1 * +!PF/M*MPX1*!ALBG*!APIX0*!APIX1 * +!PF/M*MPX2*!ALBG*!APIX0*!APIX1 * +!PF/M*MPX3*!ALBG*!APIX0*!APIX1 * * --- CRA10 is the 0x200 bit of the color RAM index; set if pf is displayed * CRA10:=CS1 * * --- CRA9 is the 0x100 bit of the color RAM index; set if mo is displayed * or if the playfield selected is playfield #2 * CRA9:=PFXS*CS1 * +!CS1*CS0 * * --- CRA8-1 are the low 8 bits of the color RAM index; set as expected * CRA8:=CS1*PFX7 * +!CS1*MPX7*CS0 * +!CS1*!CS0*ALC4 * * CRA7:=CS1*PFX6 * +!CS1*MPX6*CS0 * * CRA6:=CS1*PFX5 * +MPX5*!CS1*CS0 * +!CS1*!CS0*ALC3 * * CRA5:=CS1*PFX4 * +MPX4*!CS1*CS0 * +!CS1*ALC2*!CS0 * * CRA4:=CS1*PFX3 * +!CS1*MPX3*CS0 * +!CS1*!CS0*ALC1 * * CRA3:=CS1*PFX2 * +MPX2*!CS1*CS0 * +!CS1*!CS0*ALC0 * * CRA2:=CS1*PFX1 * +MPX1*!CS1*CS0 * +!CS1*!CS0*APIX1 * * CRA1:=CS1*PFX0 * +MPX0*!CS1*CS0 * +!CS1*!CS0*APIX0 */ int mopriority = mo[x] >> ATARIMO_PRIORITY_SHIFT; int pfm = 0; /* upper bit of MO priority signals special rendering and doesn't draw anything */ if (mopriority & 4) continue; /* determine pf/m signal */ if ((mo[x] & 0xff) == 1) pfm = 1; else if (pf[x] & 8) { int pfpriority = (pri[x] & 0x80) ? ((pri[x] >> 2) & 3) : (pri[x] & 3); if (((pfpriority == 3) && !(mopriority & 1)) || ((pfpriority & 1) && (mopriority == 0)) || ((pfpriority & 2) && !(mopriority & 2))) pfm = 1; } /* if pfm is low, we display the mo */ if (!pfm) 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; }