diff options
Diffstat (limited to 'src/mame/video/vindictr.c')
-rw-r--r-- | src/mame/video/vindictr.c | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/src/mame/video/vindictr.c b/src/mame/video/vindictr.c new file mode 100644 index 00000000000..1c69805b485 --- /dev/null +++ b/src/mame/video/vindictr.c @@ -0,0 +1,303 @@ +/*************************************************************************** + + Atari Vindicators hardware + +****************************************************************************/ + +#include "driver.h" +#include "machine/atarigen.h" +#include "vindictr.h" +#include "thunderj.h" + + + +/************************************* + * + * Statics + * + *************************************/ + +static UINT8 playfield_tile_bank; +static UINT16 playfield_xscroll; +static UINT16 playfield_yscroll; + + + +/************************************* + * + * Tilemap callbacks + * + *************************************/ + +static TILE_GET_INFO( get_alpha_tile_info ) +{ + UINT16 data = atarigen_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 ) +{ + UINT16 data = atarigen_playfield[tile_index]; + int code = (playfield_tile_bank * 0x1000) + (data & 0xfff); + int color = 0x10 + 2 * ((data >> 12) & 7); + SET_TILE_INFO(0, code, color, (data >> 15) & 1); +} + + + +/************************************* + * + * Video system start + * + *************************************/ + +VIDEO_START( vindictr ) +{ + static const struct 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 */ + + {{ 0,0,0,0x03ff }}, /* mask for the link */ + {{ 0 }}, /* mask for the graphics bank */ + {{ 0x7fff,0,0,0 }}, /* mask for the code index */ + {{ 0 }}, /* mask for the upper code index */ + {{ 0,0x000f,0,0 }}, /* mask for the color */ + {{ 0,0xff80,0,0 }}, /* mask for the X position */ + {{ 0,0,0xff80,0 }}, /* mask for the Y position */ + {{ 0,0,0x0038,0 }}, /* mask for the width, in tiles*/ + {{ 0,0,0x0007,0 }}, /* mask for the height, in tiles */ + {{ 0,0,0x0040,0 }}, /* mask for the horizontal flip */ + {{ 0 }}, /* mask for the vertical flip */ + {{ 0,0x0070,0,0 }}, /* 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 */ + }; + + /* initialize the playfield */ + atarigen_playfield_tilemap = tilemap_create(get_playfield_tile_info, tilemap_scan_cols, TILEMAP_TYPE_PEN, 8,8, 64,64); + + /* initialize the motion objects */ + atarimo_init(machine, 0, &modesc); + + /* initialize the alphanumerics */ + atarigen_alpha_tilemap = tilemap_create(get_alpha_tile_info, tilemap_scan_rows, TILEMAP_TYPE_PEN, 8,8, 64,32); + tilemap_set_transparent_pen(atarigen_alpha_tilemap, 0); +} + + + +/************************************* + * + * Palette RAM control + * + *************************************/ + +WRITE16_HANDLER( vindictr_paletteram_w ) +{ + static const int ztable[16] = + { 0x0, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf, 0x10, 0x11 }; + int c; + + /* first blend the data */ + COMBINE_DATA(&paletteram16[offset]); + data = paletteram16[offset]; + + /* now generate colors at all 16 intensities */ + for (c = 0; c < 8; c++) + { + int i = ztable[((data >> 12) + (c * 2)) & 15]; + int r = ((data >> 8) & 15) * i; + int g = ((data >> 4) & 15) * i; + int b = ((data >> 0) & 15) * i; + + palette_set_color(Machine,offset + c*2048,MAKE_RGB(r,g,b)); + } +} + + + +/************************************* + * + * Periodic scanline updater + * + *************************************/ + +void vindictr_scanline_update(running_machine *machine, int scrnum, int scanline) +{ + UINT16 *base = &atarigen_alpha[((scanline - 8) / 8) * 64 + 42]; + int x; + + /* keep in range */ + if (base < atarigen_alpha) + base += 0x7c0; + else if (base >= &atarigen_alpha[0x7c0]) + return; + + /* update the current parameters */ + for (x = 42; x < 64; x++) + { + UINT16 data = *base++; + + switch ((data >> 9) & 7) + { + case 2: /* /PFB */ + if (playfield_tile_bank != (data & 7)) + { + video_screen_update_partial(0, scanline - 1); + playfield_tile_bank = data & 7; + tilemap_mark_all_tiles_dirty(atarigen_playfield_tilemap); + } + break; + + case 3: /* /PFHSLD */ + if (playfield_xscroll != (data & 0x1ff)) + { + video_screen_update_partial(0, scanline - 1); + tilemap_set_scrollx(atarigen_playfield_tilemap, 0, data); + playfield_xscroll = data & 0x1ff; + } + break; + + case 4: /* /MOHS */ + if (atarimo_get_xscroll(0) != (data & 0x1ff)) + { + video_screen_update_partial(0, scanline - 1); + atarimo_set_xscroll(0, data & 0x1ff); + } + break; + + case 5: /* /PFSPC */ + break; + + case 6: /* /VIRQ */ + atarigen_scanline_int_gen(); + break; + + case 7: /* /PFVS */ + { + /* a new vscroll latches the offset into a counter; we must adjust for this */ + int offset = scanline; + if (offset > machine->screen[0].visarea.max_y) + offset -= machine->screen[0].visarea.max_y + 1; + + if (playfield_yscroll != ((data - offset) & 0x1ff)) + { + video_screen_update_partial(0, scanline - 1); + tilemap_set_scrolly(atarigen_playfield_tilemap, 0, data - offset); + atarimo_set_yscroll(0, (data - offset) & 0x1ff); + } + break; + } + } + } +} + + + +/************************************* + * + * Main refresh + * + *************************************/ + +VIDEO_UPDATE( vindictr ) +{ + struct atarimo_rect_list rectlist; + mame_bitmap *mobitmap; + int x, y, r; + + /* draw the playfield */ + tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 0, 0); + + /* draw and merge the MO */ + mobitmap = atarimo_render(machine, 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]) + { + /* partially verified via schematics (there are a lot of PALs involved!): + + SHADE = PAL(MPR1-0, LB7-0, PFX6-5, PFX3-2, PF/M) + + if (SHADE) + CRA |= 0x100 + + MOG3-1 = ~MAT3-1 if MAT6==1 and MSD3==1 + */ + int mopriority = mo[x] >> ATARIMO_PRIORITY_SHIFT; + + /* upper bit of MO priority signals special rendering and doesn't draw anything */ + if (mopriority & 4) + continue; + + /* MO pen 1 doesn't draw, but it sets the SHADE flag and bumps the palette offset */ + if ((mo[x] & 0x0f) == 1) + { + if ((mo[x] & 0xf0) != 0) + pf[x] |= 0x100; + } + else + 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, atarigen_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) + thunderj_mark_high_palette(bitmap, pf, mo, x, y); + + /* if the upper bit of pen data is set, we adjust the final intensity */ + if (mo[x] & 8) + pf[x] |= (~mo[x] & 0xe0) << 6; + } + + /* erase behind ourselves */ + mo[x] = 0; + } + } + return 0; +} |