diff options
Diffstat (limited to 'src/mame/video/thunderj.c')
-rw-r--r-- | src/mame/video/thunderj.c | 296 |
1 files changed, 296 insertions, 0 deletions
diff --git a/src/mame/video/thunderj.c b/src/mame/video/thunderj.c new file mode 100644 index 00000000000..baf3d46875c --- /dev/null +++ b/src/mame/video/thunderj.c @@ -0,0 +1,296 @@ +/*************************************************************************** + + Atari ThunderJaws hardware + +****************************************************************************/ + +#include "driver.h" +#include "machine/atarigen.h" +#include "includes/thunderj.h" + + + +/************************************* + * + * Globals + * + *************************************/ + +UINT8 thunderj_alpha_tile_bank; + + + +/************************************* + * + * Tilemap callbacks + * + *************************************/ + +static TILE_GET_INFO( get_alpha_tile_info ) +{ + UINT16 data = atarigen_alpha[tile_index]; + int code = ((data & 0x200) ? (thunderj_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 ) +{ + UINT16 data1 = atarigen_playfield[tile_index]; + UINT16 data2 = atarigen_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 ) +{ + UINT16 data1 = atarigen_playfield2[tile_index]; + UINT16 data2 = atarigen_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 struct 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 */ + }; + + /* initialize the playfield */ + atarigen_playfield_tilemap = tilemap_create(get_playfield_tile_info, tilemap_scan_cols, TILEMAP_TYPE_PEN, 8,8, 64,64); + + /* initialize the second playfield */ + atarigen_playfield2_tilemap = tilemap_create(get_playfield2_tile_info, tilemap_scan_cols, TILEMAP_TYPE_PEN, 8,8, 64,64); + tilemap_set_transparent_pen(atarigen_playfield2_tilemap, 0); + + /* 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); +} + + + +/************************************* + * + * Mark high palette bits starting + * at the given X,Y and continuing + * until a stop or the end of line + * + *************************************/ + +void thunderj_mark_high_palette(mame_bitmap *bitmap, UINT16 *pf, UINT16 *mo, int x, int y) +{ + #define START_MARKER ((4 << ATARIMO_PRIORITY_SHIFT) | 2) + #define END_MARKER ((4 << ATARIMO_PRIORITY_SHIFT) | 4) + int offnext = 0; + + for ( ; x < bitmap->width; x++) + { + pf[x] |= 0x400; + if (offnext && (mo[x] & START_MARKER) != START_MARKER) + break; + offnext = ((mo[x] & END_MARKER) == END_MARKER); + } + } + + + +/************************************* + * + * Main refresh + * + *************************************/ + +VIDEO_UPDATE( thunderj ) +{ + struct atarimo_rect_list rectlist; + mame_bitmap *mobitmap; + int x, y, r; + + /* draw the playfield */ + fillbitmap(priority_bitmap, 0, cliprect); + tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 0, 0x00); + tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 1, 0x01); + tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 2, 0x02); + tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 3, 0x03); + tilemap_draw(bitmap, cliprect, atarigen_playfield2_tilemap, 0, 0x80); + tilemap_draw(bitmap, cliprect, atarigen_playfield2_tilemap, 1, 0x84); + tilemap_draw(bitmap, cliprect, atarigen_playfield2_tilemap, 2, 0x88); + tilemap_draw(bitmap, cliprect, atarigen_playfield2_tilemap, 3, 0x8c); + + /* 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; + 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, 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); + } + + /* erase behind ourselves */ + mo[x] = 0; + } + } + return 0; +} |