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C/C++ Source or Header  |  2000-04-04  |  8KB  |  314 lines
  1. /***************************************************************************
  2.  
  3.     Ninja Gaiden / Tecmo Knights Video Hardware
  4.  
  5. ***************************************************************************/
  6.  
  7. #include "driver.h"
  8. #include "vidhrdw/generic.h"
  9.  
  10. unsigned char *gaiden_videoram;
  11. unsigned char *gaiden_videoram2;
  12. unsigned char *gaiden_videoram3;
  13.  
  14. static struct tilemap *text_layer,*foreground,*background;
  15.  
  16.  
  17. /***************************************************************************
  18.  
  19.   Callbacks for the TileMap code
  20.  
  21. ***************************************************************************/
  22.  
  23. static void get_bg_tile_info(int tile_index)
  24. {
  25.     UINT16 *videoram1 = (UINT16 *)&gaiden_videoram3[0x1000];
  26.     UINT16 *videoram2 = (UINT16 *)gaiden_videoram3;
  27.     SET_TILE_INFO(1,videoram1[tile_index] & 0xfff,(videoram2[tile_index] & 0xf0) >> 4)
  28. }
  29.  
  30. static void get_fg_tile_info(int tile_index)
  31. {
  32.     UINT16 *videoram1 = (UINT16 *)&gaiden_videoram2[0x1000];
  33.     UINT16 *videoram2 = (UINT16 *)gaiden_videoram2;
  34.     SET_TILE_INFO(2,videoram1[tile_index] & 0xfff,(videoram2[tile_index] & 0xf0) >> 4)
  35. }
  36.  
  37. static void get_tx_tile_info(int tile_index)
  38. {
  39.     UINT16 *videoram1 = (UINT16 *)&gaiden_videoram[0x0800];
  40.     UINT16 *videoram2 = (UINT16 *)gaiden_videoram;
  41.     SET_TILE_INFO(0,videoram1[tile_index] & 0x7ff,(videoram2[tile_index] & 0xf0) >> 4)
  42. }
  43.  
  44.  
  45. /***************************************************************************
  46.  
  47.   Start the video hardware emulation.
  48.  
  49. ***************************************************************************/
  50.  
  51. int gaiden_vh_start(void)
  52. {
  53.     background = tilemap_create(get_bg_tile_info,tilemap_scan_rows,TILEMAP_TRANSPARENT,16,16,64,32);
  54.     foreground = tilemap_create(get_fg_tile_info,tilemap_scan_rows,TILEMAP_TRANSPARENT,16,16,64,32);
  55.     text_layer = tilemap_create(get_tx_tile_info,tilemap_scan_rows,TILEMAP_TRANSPARENT, 8, 8,32,32);
  56.  
  57.     if (!text_layer || !foreground || !background)
  58.         return 1;
  59.  
  60.     background->transparent_pen = 0;
  61.     foreground->transparent_pen = 0;
  62.     text_layer->transparent_pen = 0;
  63.     palette_transparent_color = 0x200; /* background color */
  64.     return 0;
  65. }
  66.  
  67.  
  68.  
  69. /***************************************************************************
  70.  
  71.   Memory handlers
  72.  
  73. ***************************************************************************/
  74.  
  75. WRITE_HANDLER( gaiden_txscrollx_w )
  76. {
  77.     static UINT16 oldword;
  78.     oldword = COMBINE_WORD(oldword,data);
  79.     tilemap_set_scrollx(text_layer,0,oldword);
  80. }
  81.  
  82. WRITE_HANDLER( gaiden_txscrolly_w )
  83. {
  84.     static UINT16 oldword;
  85.     oldword = COMBINE_WORD(oldword,data);
  86.     tilemap_set_scrolly(text_layer,0,oldword);
  87. }
  88.  
  89. WRITE_HANDLER( gaiden_fgscrollx_w )
  90. {
  91.     static UINT16 oldword;
  92.     oldword = COMBINE_WORD(oldword,data);
  93.     tilemap_set_scrollx(foreground,0,oldword);
  94. }
  95.  
  96. WRITE_HANDLER( gaiden_fgscrolly_w )
  97. {
  98.     static UINT16 oldword;
  99.     oldword = COMBINE_WORD(oldword,data);
  100.     tilemap_set_scrolly(foreground,0,oldword);
  101. }
  102.  
  103. WRITE_HANDLER( gaiden_bgscrollx_w )
  104. {
  105.     static UINT16 oldword;
  106.     oldword = COMBINE_WORD(oldword,data);
  107.     tilemap_set_scrollx(background,0,oldword);
  108. }
  109.  
  110. WRITE_HANDLER( gaiden_bgscrolly_w )
  111. {
  112.     static UINT16 oldword;
  113.     oldword = COMBINE_WORD(oldword,data);
  114.     tilemap_set_scrolly(background,0,oldword);
  115. }
  116.  
  117. WRITE_HANDLER( gaiden_videoram3_w )
  118. {
  119.     int oldword = READ_WORD(&gaiden_videoram3[offset]);
  120.     int newword = COMBINE_WORD(oldword,data);
  121.  
  122.     if (oldword != newword)
  123.     {
  124.         int tile_index = (offset/2)&0x7ff;
  125.         WRITE_WORD(&gaiden_videoram3[offset],newword);
  126.         tilemap_mark_tile_dirty(background,tile_index);
  127.     }
  128. }
  129.  
  130. READ_HANDLER( gaiden_videoram3_r )
  131. {
  132.    return READ_WORD(&gaiden_videoram3[offset]);
  133. }
  134.  
  135. WRITE_HANDLER( gaiden_videoram2_w )
  136. {
  137.     int oldword = READ_WORD(&gaiden_videoram2[offset]);
  138.     int newword = COMBINE_WORD(oldword,data);
  139.  
  140.     if (oldword != newword)
  141.     {
  142.         int tile_index = (offset/2)&0x7ff;
  143.         WRITE_WORD(&gaiden_videoram2[offset],newword);
  144.         tilemap_mark_tile_dirty(foreground,tile_index);
  145.     }
  146. }
  147.  
  148. READ_HANDLER( gaiden_videoram2_r )
  149. {
  150.    return READ_WORD(&gaiden_videoram2[offset]);
  151. }
  152.  
  153. WRITE_HANDLER( gaiden_videoram_w )
  154. {
  155.     int oldword = READ_WORD(&gaiden_videoram[offset]);
  156.     int newword = COMBINE_WORD(oldword,data);
  157.  
  158.     if (oldword != newword)
  159.     {
  160.         int tile_index = (offset/2)&0x3ff;
  161.         WRITE_WORD(&gaiden_videoram[offset],newword);
  162.         tilemap_mark_tile_dirty(text_layer,tile_index);
  163.     }
  164. }
  165.  
  166. READ_HANDLER( gaiden_videoram_r )
  167. {
  168.     return READ_WORD(&gaiden_videoram[offset]);
  169. }
  170.  
  171.  
  172.  
  173. /***************************************************************************
  174.  
  175.   Display refresh
  176.  
  177. ***************************************************************************/
  178.  
  179. /* sprite format:
  180.  *
  181.  *    word        bit                    usage
  182.  * --------+-fedcba9876543210-+----------------
  183.  *    0    | ---------------x | flip x
  184.  *         | --------------x- | flip y
  185.  *         | -------------x-- | enable
  186.  *         | ----------x----- | flicker
  187.  *         | --------xx------ | sprite-tile priority
  188.  *    1    | xxxxxxxxxxxxxxxx | number
  189.  *    2    | --------xxxx---- | palette
  190.  *         | --------------xx | size: 8x8, 16x16, 32x32, 64x64
  191.  *    3    | xxxxxxxxxxxxxxxx | y position
  192.  *    4    | xxxxxxxxxxxxxxxx | x position
  193.  *    5,6,7|                  | unused
  194.  */
  195.  
  196. #define NUM_SPRITES 128
  197.  
  198. static void mark_sprite_colors(void)
  199. {
  200.     const UINT16 *source = (UINT16 *)spriteram;
  201.     const struct GfxElement *gfx = Machine->gfx[3];
  202.     int i;
  203.     for (i = 0;i < NUM_SPRITES;i++)
  204.     {
  205.         UINT32 attributes = source[0];
  206.         if (attributes & 0x04)    /* visible */
  207.         {
  208.             UINT32 pen_usage = 0xfffe;
  209.             UINT32 color = (source[2] >> 4) & 0xf;
  210.             const UINT16 *pal_data = &gfx->colortable[gfx->color_granularity * color];
  211.             int indx = pal_data - Machine->remapped_colortable;
  212.             while (pen_usage)
  213.             {
  214.                 if (pen_usage & 1) palette_used_colors[indx] = PALETTE_COLOR_USED;
  215.                 pen_usage >>= 1;
  216.                 indx++;
  217.             }
  218.         }
  219.         source += 8;
  220.     }
  221. }
  222.  
  223. static void draw_sprites( struct osd_bitmap *bitmap )
  224. {
  225.     const UINT8 layout[8][8] =
  226.     {
  227.         {0,1,4,5,16,17,20,21},
  228.         {2,3,6,7,18,19,22,23},
  229.         {8,9,12,13,24,25,28,29},
  230.         {10,11,14,15,26,27,30,31},
  231.         {32,33,36,37,48,49,52,53},
  232.         {34,35,38,39,50,51,54,55},
  233.         {40,41,44,45,56,57,60,61},
  234.         {42,43,46,47,58,59,62,63}
  235.     };
  236.  
  237.     const struct rectangle *clip = &Machine->drv->visible_area;
  238.     const struct GfxElement *gfx = Machine->gfx[3];
  239.     const UINT16 *source = (NUM_SPRITES-1)*8 + (UINT16 *)spriteram;
  240.     int count = NUM_SPRITES;
  241.  
  242.     /* draw all sprites from front to back */
  243.     while( count-- )
  244.     {
  245.         UINT32 attributes = source[0];
  246.         if ( (attributes&0x04) && ((attributes&0x20)==0 || (cpu_getcurrentframe() & 1)) )
  247.         {
  248.             UINT32 priority = (attributes>>6)&3;
  249.             UINT32 number = (source[1]&0x7fff);
  250.             UINT32 color = source[2];
  251.             UINT32 size = 1<<(color&0x3); // 1,2,4,8
  252.             UINT32 flipx = (attributes&1);
  253.             UINT32 flipy = (attributes&2);
  254.             UINT32 priority_mask;
  255.             int ypos = source[3] & 0x1ff;
  256.             int xpos = source[4] & 0x1ff;
  257.             int col,row;
  258.             color = (color>>4)&0xf;
  259.  
  260.             /* wraparound */
  261.             if( xpos >= 256) xpos -= 512;
  262.             if( ypos >= 256) ypos -= 512;
  263.  
  264.             /* bg: 1; fg:2; text: 4 */
  265.             switch( priority )
  266.             {
  267.                 default:
  268.                 case 0x0: priority_mask = 0; break;
  269.                 case 0x1: priority_mask = 0xf0; break; /* obscured by text layer */
  270.                 case 0x2: priority_mask = 0xf0|0xcc; break;    /* obscured by foreground */
  271.                 case 0x3: priority_mask = 0xf0|0xcc|0xaa; break; /* obscured by bg and fg */
  272.             }
  273.  
  274.             for( row=0; row<size; row++ )
  275.             {
  276.                 for( col=0; col<size; col++ )
  277.                 {
  278.                     int sx = xpos + 8*(flipx?(size-1-col):col);
  279.                     int sy = ypos + 8*(flipy?(size-1-row):row);
  280.                     pdrawgfx(bitmap,gfx,
  281.                         number + layout[row][col],
  282.                         color,
  283.                         flipx,flipy,
  284.                         sx,sy,
  285.                         clip,TRANSPARENCY_PEN,0,
  286.                         priority_mask);
  287.                 }
  288.             }
  289.         }
  290.         source -= 8;
  291.     }
  292. }
  293.  
  294. void gaiden_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
  295. {
  296.     tilemap_update(ALL_TILEMAPS);
  297.  
  298.     palette_init_used_colors();
  299.     mark_sprite_colors();
  300.     palette_used_colors[0x200] = PALETTE_COLOR_USED;
  301.  
  302.     if (palette_recalc()) tilemap_mark_all_pixels_dirty(ALL_TILEMAPS);
  303.  
  304.     tilemap_render(ALL_TILEMAPS);
  305.  
  306.     fillbitmap(priority_bitmap,0,NULL);
  307.     fillbitmap(bitmap,Machine->pens[0x200],&Machine->drv->visible_area);
  308.     tilemap_draw(bitmap,background,1<<16);
  309.     tilemap_draw(bitmap,foreground,2<<16);
  310.     tilemap_draw(bitmap,text_layer,4<<16);
  311.  
  312.     draw_sprites( bitmap );
  313. }
  314.