home *** CD-ROM | disk | FTP | other *** search
/ EuroCD 3 / EuroCD 3.iso / Games / Doom / ADoom-0.8 / ADoom_src / v_video.c < prev    next >
C/C++ Source or Header  |  1998-06-24  |  13KB  |  494 lines

  1. // Emacs style mode select   -*- C++ -*- 
  2. //-----------------------------------------------------------------------------
  3. //
  4. // $Id:$
  5. //
  6. // Copyright (C) 1993-1996 by id Software, Inc.
  7. //
  8. // This source is available for distribution and/or modification
  9. // only under the terms of the DOOM Source Code License as
  10. // published by id Software. All rights reserved.
  11. //
  12. // The source is distributed in the hope that it will be useful,
  13. // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14. // FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
  15. // for more details.
  16. //
  17. // $Log:$
  18. //
  19. // DESCRIPTION:
  20. //    Gamma correction LUT stuff.
  21. //    Functions to draw patches (by post) directly to screen.
  22. //    Functions to blit a block to the screen.
  23. //
  24. //-----------------------------------------------------------------------------
  25.  
  26.  
  27. static const char
  28. rcsid[] = "$Id: v_video.c,v 1.5 1997/02/03 22:45:13 b1 Exp $";
  29.  
  30.  
  31. #include "i_system.h"
  32. #include "r_local.h"
  33.  
  34. #include "doomdef.h"
  35. #include "doomdata.h"
  36.  
  37. #include "m_bbox.h"
  38. #include "m_swap.h"
  39.  
  40. #include "v_video.h"
  41.  
  42.  
  43. // Each screen is [SCREENWIDTH*SCREENHEIGHT]; 
  44. byte*                screens[5];    
  45.  
  46. int                dirtybox[4]; 
  47.  
  48.  
  49.  
  50. // Now where did these came from?
  51. byte gammatable[5][256] =
  52. {
  53.     {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,
  54.      17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,
  55.      33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,
  56.      49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,
  57.      65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,
  58.      81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,
  59.      97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,
  60.      113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,
  61.      128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,
  62.      144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,
  63.      160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,
  64.      176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,
  65.      192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,
  66.      208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,
  67.      224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,
  68.      240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255},
  69.  
  70.     {2,4,5,7,8,10,11,12,14,15,16,18,19,20,21,23,24,25,26,27,29,30,31,
  71.      32,33,34,36,37,38,39,40,41,42,44,45,46,47,48,49,50,51,52,54,55,
  72.      56,57,58,59,60,61,62,63,64,65,66,67,69,70,71,72,73,74,75,76,77,
  73.      78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,
  74.      99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,
  75.      115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,129,
  76.      130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,
  77.      146,147,148,148,149,150,151,152,153,154,155,156,157,158,159,160,
  78.      161,162,163,163,164,165,166,167,168,169,170,171,172,173,174,175,
  79.      175,176,177,178,179,180,181,182,183,184,185,186,186,187,188,189,
  80.      190,191,192,193,194,195,196,196,197,198,199,200,201,202,203,204,
  81.      205,205,206,207,208,209,210,211,212,213,214,214,215,216,217,218,
  82.      219,220,221,222,222,223,224,225,226,227,228,229,230,230,231,232,
  83.      233,234,235,236,237,237,238,239,240,241,242,243,244,245,245,246,
  84.      247,248,249,250,251,252,252,253,254,255},
  85.  
  86.     {4,7,9,11,13,15,17,19,21,22,24,26,27,29,30,32,33,35,36,38,39,40,42,
  87.      43,45,46,47,48,50,51,52,54,55,56,57,59,60,61,62,63,65,66,67,68,69,
  88.      70,72,73,74,75,76,77,78,79,80,82,83,84,85,86,87,88,89,90,91,92,93,
  89.      94,95,96,97,98,100,101,102,103,104,105,106,107,108,109,110,111,112,
  90.      113,114,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,
  91.      129,130,131,132,133,133,134,135,136,137,138,139,140,141,142,143,144,
  92.      144,145,146,147,148,149,150,151,152,153,153,154,155,156,157,158,159,
  93.      160,160,161,162,163,164,165,166,166,167,168,169,170,171,172,172,173,
  94.      174,175,176,177,178,178,179,180,181,182,183,183,184,185,186,187,188,
  95.      188,189,190,191,192,193,193,194,195,196,197,197,198,199,200,201,201,
  96.      202,203,204,205,206,206,207,208,209,210,210,211,212,213,213,214,215,
  97.      216,217,217,218,219,220,221,221,222,223,224,224,225,226,227,228,228,
  98.      229,230,231,231,232,233,234,235,235,236,237,238,238,239,240,241,241,
  99.      242,243,244,244,245,246,247,247,248,249,250,251,251,252,253,254,254,
  100.      255},
  101.  
  102.     {8,12,16,19,22,24,27,29,31,34,36,38,40,41,43,45,47,49,50,52,53,55,
  103.      57,58,60,61,63,64,65,67,68,70,71,72,74,75,76,77,79,80,81,82,84,85,
  104.      86,87,88,90,91,92,93,94,95,96,98,99,100,101,102,103,104,105,106,107,
  105.      108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,
  106.      125,126,127,128,129,130,131,132,133,134,135,135,136,137,138,139,140,
  107.      141,142,143,143,144,145,146,147,148,149,150,150,151,152,153,154,155,
  108.      155,156,157,158,159,160,160,161,162,163,164,165,165,166,167,168,169,
  109.      169,170,171,172,173,173,174,175,176,176,177,178,179,180,180,181,182,
  110.      183,183,184,185,186,186,187,188,189,189,190,191,192,192,193,194,195,
  111.      195,196,197,197,198,199,200,200,201,202,202,203,204,205,205,206,207,
  112.      207,208,209,210,210,211,212,212,213,214,214,215,216,216,217,218,219,
  113.      219,220,221,221,222,223,223,224,225,225,226,227,227,228,229,229,230,
  114.      231,231,232,233,233,234,235,235,236,237,237,238,238,239,240,240,241,
  115.      242,242,243,244,244,245,246,246,247,247,248,249,249,250,251,251,252,
  116.      253,253,254,254,255},
  117.  
  118.     {16,23,28,32,36,39,42,45,48,50,53,55,57,60,62,64,66,68,69,71,73,75,76,
  119.      78,80,81,83,84,86,87,89,90,92,93,94,96,97,98,100,101,102,103,105,106,
  120.      107,108,109,110,112,113,114,115,116,117,118,119,120,121,122,123,124,
  121.      125,126,128,128,129,130,131,132,133,134,135,136,137,138,139,140,141,
  122.      142,143,143,144,145,146,147,148,149,150,150,151,152,153,154,155,155,
  123.      156,157,158,159,159,160,161,162,163,163,164,165,166,166,167,168,169,
  124.      169,170,171,172,172,173,174,175,175,176,177,177,178,179,180,180,181,
  125.      182,182,183,184,184,185,186,187,187,188,189,189,190,191,191,192,193,
  126.      193,194,195,195,196,196,197,198,198,199,200,200,201,202,202,203,203,
  127.      204,205,205,206,207,207,208,208,209,210,210,211,211,212,213,213,214,
  128.      214,215,216,216,217,217,218,219,219,220,220,221,221,222,223,223,224,
  129.      224,225,225,226,227,227,228,228,229,229,230,230,231,232,232,233,233,
  130.      234,234,235,235,236,236,237,237,238,239,239,240,240,241,241,242,242,
  131.      243,243,244,244,245,245,246,246,247,247,248,248,249,249,250,250,251,
  132.      251,252,252,253,254,254,255,255}
  133. };
  134.  
  135.  
  136.  
  137. int    usegamma;
  138.              
  139. //
  140. // V_MarkRect 
  141. // 
  142. void
  143. V_MarkRect
  144. ( int        x,
  145.   int        y,
  146.   int        width,
  147.   int        height ) 
  148.     M_AddToBox (dirtybox, x, y); 
  149.     M_AddToBox (dirtybox, x+width-1, y+height-1); 
  150.  
  151.  
  152. //
  153. // V_CopyRect 
  154. // 
  155. void
  156. V_CopyRect
  157. ( int        srcx,
  158.   int        srcy,
  159.   int        srcscrn,
  160.   int        width,
  161.   int        height,
  162.   int        destx,
  163.   int        desty,
  164.   int        destscrn ) 
  165.     byte*    src;
  166.     byte*    dest; 
  167.      
  168. #ifdef RANGECHECK 
  169.     if (srcx<0
  170.     ||srcx+width >SCREENWIDTH
  171.     || srcy<0
  172.     || srcy+height>SCREENHEIGHT 
  173.     ||destx<0||destx+width >SCREENWIDTH
  174.     || desty<0
  175.     || desty+height>SCREENHEIGHT 
  176.     || (unsigned)srcscrn>4
  177.     || (unsigned)destscrn>4)
  178.     {
  179.     I_Error ("Bad V_CopyRect");
  180.     }
  181. #endif 
  182.     V_MarkRect (destx, desty, width, height); 
  183.      
  184.     src = screens[srcscrn]+SCREENWIDTH*srcy+srcx; 
  185.     dest = screens[destscrn]+SCREENWIDTH*desty+destx; 
  186.  
  187.     for ( ; height>0 ; height--) 
  188.     { 
  189.     memcpy (dest, src, width); 
  190.     src += SCREENWIDTH; 
  191.     dest += SCREENWIDTH; 
  192.     } 
  193.  
  194.  
  195. //
  196. // V_DrawPatch
  197. // Masks a column based masked pic to the screen. 
  198. //
  199. void
  200. V_DrawPatch
  201. ( int        x,
  202.   int        y,
  203.   int        scrn,
  204.   patch_t*    patch ) 
  205.  
  206.     int        count;
  207.     int        col; 
  208.     column_t*    column; 
  209.     byte*    desttop;
  210.     byte*    dest;
  211.     byte*    source; 
  212.     int        w; 
  213.      
  214.     y -= SHORT(patch->topoffset); 
  215.     x -= SHORT(patch->leftoffset); 
  216. #ifdef RANGECHECK 
  217.     if (x<0
  218.     ||x+SHORT(patch->width) >SCREENWIDTH
  219.     || y<0
  220.     || y+SHORT(patch->height)>SCREENHEIGHT 
  221.     || (unsigned)scrn>4)
  222.     {
  223.       fprintf( stderr, "Patch at %d,%d exceeds LFB\n", x,y );
  224.       // No I_Error abort - what is up with TNT.WAD?
  225.       fprintf( stderr, "V_DrawPatch: bad patch (ignored)\n");
  226.       return;
  227.     }
  228. #endif 
  229.  
  230.     if (!scrn)
  231.     V_MarkRect (x, y, SHORT(patch->width), SHORT(patch->height)); 
  232.  
  233.     col = 0; 
  234.     desttop = screens[scrn]+y*SCREENWIDTH+x; 
  235.      
  236.     w = SHORT(patch->width); 
  237.  
  238.     for ( ; col<w ; x++, col++, desttop++)
  239.     { 
  240.     column = (column_t *)((byte *)patch + LONG(patch->columnofs[col])); 
  241.  
  242.     // step through the posts in a column 
  243.     while (column->topdelta != 0xff ) 
  244.     { 
  245.         source = (byte *)column + 3; 
  246.         dest = desttop + column->topdelta*SCREENWIDTH; 
  247.         count = column->length; 
  248.              
  249.         while (count--) 
  250.         { 
  251.         *dest = *source++; 
  252.         dest += SCREENWIDTH; 
  253.         } 
  254.         column = (column_t *)(  (byte *)column + column->length 
  255.                     + 4 ); 
  256.     } 
  257.     }             
  258.  
  259. //
  260. // V_DrawPatchFlipped 
  261. // Masks a column based masked pic to the screen.
  262. // Flips horizontally, e.g. to mirror face.
  263. //
  264. void
  265. V_DrawPatchFlipped
  266. ( int        x,
  267.   int        y,
  268.   int        scrn,
  269.   patch_t*    patch ) 
  270.  
  271.     int        count;
  272.     int        col; 
  273.     column_t*    column; 
  274.     byte*    desttop;
  275.     byte*    dest;
  276.     byte*    source; 
  277.     int        w; 
  278.      
  279.     y -= SHORT(patch->topoffset); 
  280.     x -= SHORT(patch->leftoffset); 
  281. #ifdef RANGECHECK 
  282.     if (x<0
  283.     ||x+SHORT(patch->width) >SCREENWIDTH
  284.     || y<0
  285.     || y+SHORT(patch->height)>SCREENHEIGHT 
  286.     || (unsigned)scrn>4)
  287.     {
  288.       fprintf( stderr, "Patch origin %d,%d exceeds LFB\n", x,y );
  289.       I_Error ("Bad V_DrawPatch in V_DrawPatchFlipped");
  290.     }
  291. #endif 
  292.  
  293.     if (!scrn)
  294.     V_MarkRect (x, y, SHORT(patch->width), SHORT(patch->height)); 
  295.  
  296.     col = 0; 
  297.     desttop = screens[scrn]+y*SCREENWIDTH+x; 
  298.      
  299.     w = SHORT(patch->width); 
  300.  
  301.     for ( ; col<w ; x++, col++, desttop++) 
  302.     { 
  303.     column = (column_t *)((byte *)patch + LONG(patch->columnofs[w-1-col])); 
  304.  
  305.     // step through the posts in a column 
  306.     while (column->topdelta != 0xff ) 
  307.     { 
  308.         source = (byte *)column + 3; 
  309.         dest = desttop + column->topdelta*SCREENWIDTH; 
  310.         count = column->length; 
  311.              
  312.         while (count--) 
  313.         { 
  314.         *dest = *source++; 
  315.         dest += SCREENWIDTH; 
  316.         } 
  317.         column = (column_t *)(  (byte *)column + column->length 
  318.                     + 4 ); 
  319.     } 
  320.     }             
  321.  
  322.  
  323.  
  324. //
  325. // V_DrawPatchDirect
  326. // Draws directly to the screen on the pc. 
  327. //
  328. void
  329. V_DrawPatchDirect
  330. ( int        x,
  331.   int        y,
  332.   int        scrn,
  333.   patch_t*    patch ) 
  334. {
  335.     V_DrawPatch (x,y,scrn, patch); 
  336.  
  337.     /*
  338.     int        count;
  339.     int        col; 
  340.     column_t*    column; 
  341.     byte*    desttop;
  342.     byte*    dest;
  343.     byte*    source; 
  344.     int        w; 
  345.      
  346.     y -= SHORT(patch->topoffset); 
  347.     x -= SHORT(patch->leftoffset); 
  348.  
  349. #ifdef RANGECHECK 
  350.     if (x<0
  351.     ||x+SHORT(patch->width) >SCREENWIDTH
  352.     || y<0
  353.     || y+SHORT(patch->height)>SCREENHEIGHT 
  354.     || (unsigned)scrn>4)
  355.     {
  356.     I_Error ("Bad V_DrawPatchDirect");
  357.     }
  358. #endif 
  359.  
  360.     //    V_MarkRect (x, y, SHORT(patch->width), SHORT(patch->height)); 
  361.     desttop = destscreen + y*SCREENWIDTH/4 + (x>>2); 
  362.      
  363.     w = SHORT(patch->width); 
  364.     for ( col = 0 ; col<w ; col++) 
  365.     { 
  366.     outp (SC_INDEX+1,1<<(x&3)); 
  367.     column = (column_t *)((byte *)patch + LONG(patch->columnofs[col])); 
  368.  
  369.     // step through the posts in a column 
  370.      
  371.     while (column->topdelta != 0xff ) 
  372.     { 
  373.         source = (byte *)column + 3; 
  374.         dest = desttop + column->topdelta*SCREENWIDTH/4; 
  375.         count = column->length; 
  376.  
  377.         while (count--) 
  378.         { 
  379.         *dest = *source++; 
  380.         dest += SCREENWIDTH/4; 
  381.         } 
  382.         column = (column_t *)(  (byte *)column + column->length 
  383.                     + 4 ); 
  384.     } 
  385.     if ( ((++x)&3) == 0 ) 
  386.         desttop++;    // go to next byte, not next plane 
  387.     }*/ 
  388.  
  389.  
  390.  
  391. //
  392. // V_DrawBlock
  393. // Draw a linear block of pixels into the view buffer.
  394. //
  395. void
  396. V_DrawBlock
  397. ( int        x,
  398.   int        y,
  399.   int        scrn,
  400.   int        width,
  401.   int        height,
  402.   byte*        src ) 
  403.     byte*    dest; 
  404.      
  405. #ifdef RANGECHECK 
  406.     if (x<0
  407.     ||x+width >SCREENWIDTH
  408.     || y<0
  409.     || y+height>SCREENHEIGHT 
  410.     || (unsigned)scrn>4 )
  411.     {
  412.     I_Error ("Bad V_DrawBlock");
  413.     }
  414. #endif 
  415.  
  416.     V_MarkRect (x, y, width, height); 
  417.  
  418.     dest = screens[scrn] + y*SCREENWIDTH+x; 
  419.  
  420.     while (height--) 
  421.     { 
  422.     memcpy (dest, src, width); 
  423.     src += width; 
  424.     dest += SCREENWIDTH; 
  425.     } 
  426.  
  427.  
  428.  
  429. //
  430. // V_GetBlock
  431. // Gets a linear block of pixels from the view buffer.
  432. //
  433. void
  434. V_GetBlock
  435. ( int        x,
  436.   int        y,
  437.   int        scrn,
  438.   int        width,
  439.   int        height,
  440.   byte*        dest ) 
  441.     byte*    src; 
  442.      
  443. #ifdef RANGECHECK 
  444.     if (x<0
  445.     ||x+width >SCREENWIDTH
  446.     || y<0
  447.     || y+height>SCREENHEIGHT 
  448.     || (unsigned)scrn>4 )
  449.     {
  450.     I_Error ("Bad V_DrawBlock");
  451.     }
  452. #endif 
  453.  
  454.     src = screens[scrn] + y*SCREENWIDTH+x; 
  455.  
  456.     while (height--) 
  457.     { 
  458.     memcpy (dest, src, width); 
  459.     src += SCREENWIDTH; 
  460.     dest += width; 
  461.     } 
  462.  
  463.  
  464.  
  465.  
  466. //
  467. // V_Init
  468. // 
  469. void V_Init (void) 
  470.     int        i;
  471.     byte*    base;
  472.         
  473.     // stick these in low dos memory on PCs
  474.  
  475.     base = I_AllocLow (SCREENWIDTH*SCREENHEIGHT*4);
  476.  
  477.     for (i=0 ; i<4 ; i++)
  478.     screens[i] = base + i*SCREENWIDTH*SCREENHEIGHT;
  479. }
  480.