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C/C++ Source or Header  |  1997-12-27  |  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. { 
  149.     M_AddToBox (dirtybox, x, y); 
  150.     M_AddToBox (dirtybox, x+width-1, y+height-1); 
  151. } 
  152.  
  153.  
  154. //
  155. // V_CopyRect 
  156. // 
  157. void
  158. V_CopyRect
  159. ( int        srcx,
  160.   int        srcy,
  161.   int        srcscrn,
  162.   int        width,
  163.   int        height,
  164.   int        destx,
  165.   int        desty,
  166.   int        destscrn ) 
  167. { 
  168.     byte*    src;
  169.     byte*    dest; 
  170.      
  171. #ifdef RANGECHECK 
  172.     if (srcx<0
  173.     ||srcx+width >SCREENWIDTH
  174.     || srcy<0
  175.     || srcy+height>SCREENHEIGHT 
  176.     ||destx<0||destx+width >SCREENWIDTH
  177.     || desty<0
  178.     || desty+height>SCREENHEIGHT 
  179.     || (unsigned)srcscrn>4
  180.     || (unsigned)destscrn>4)
  181.     {
  182.     I_Error ("Bad V_CopyRect");
  183.     }
  184. #endif 
  185.     V_MarkRect (destx, desty, width, height); 
  186.      
  187.     src = screens[srcscrn]+SCREENWIDTH*srcy+srcx; 
  188.     dest = screens[destscrn]+SCREENWIDTH*desty+destx; 
  189.  
  190.     for ( ; height>0 ; height--) 
  191.     { 
  192.     memcpy (dest, src, width); 
  193.     src += SCREENWIDTH; 
  194.     dest += SCREENWIDTH; 
  195.     } 
  196. } 
  197.  
  198.  
  199. //
  200. // V_DrawPatch
  201. // Masks a column based masked pic to the screen. 
  202. //
  203. void
  204. V_DrawPatch
  205. ( int        x,
  206.   int        y,
  207.   int        scrn,
  208.   patch_t*    patch ) 
  209. { 
  210.  
  211.     int        count;
  212.     int        col; 
  213.     column_t*    column; 
  214.     byte*    desttop;
  215.     byte*    dest;
  216.     byte*    source; 
  217.     int        w; 
  218.      
  219.     y -= SHORT(patch->topoffset); 
  220.     x -= SHORT(patch->leftoffset); 
  221. #ifdef RANGECHECK 
  222.     if (x<0
  223.     ||x+SHORT(patch->width) >SCREENWIDTH
  224.     || y<0
  225.     || y+SHORT(patch->height)>SCREENHEIGHT 
  226.     || (unsigned)scrn>4)
  227.     {
  228.       fprintf( stderr, "Patch at %d,%d exceeds LFB\n", x,y );
  229.       // No I_Error abort - what is up with TNT.WAD?
  230.       fprintf( stderr, "V_DrawPatch: bad patch (ignored)\n");
  231.       return;
  232.     }
  233. #endif 
  234.  
  235.     if (!scrn)
  236.     V_MarkRect (x, y, SHORT(patch->width), SHORT(patch->height)); 
  237.  
  238.     col = 0; 
  239.     desttop = screens[scrn]+y*SCREENWIDTH+x; 
  240.      
  241.     w = SHORT(patch->width); 
  242.  
  243.     for ( ; col<w ; x++, col++, desttop++)
  244.     { 
  245.     column = (column_t *)((byte *)patch + LONG(patch->columnofs[col])); 
  246.  
  247.     // step through the posts in a column 
  248.     while (column->topdelta != 0xff ) 
  249.     { 
  250.         source = (byte *)column + 3; 
  251.         dest = desttop + column->topdelta*SCREENWIDTH; 
  252.         count = column->length; 
  253.              
  254.         while (count--) 
  255.         { 
  256.         *dest = *source++; 
  257.         dest += SCREENWIDTH; 
  258.         } 
  259.         column = (column_t *)(  (byte *)column + column->length 
  260.                     + 4 ); 
  261.     } 
  262.     }             
  263. } 
  264.  
  265. //
  266. // V_DrawPatchFlipped 
  267. // Masks a column based masked pic to the screen.
  268. // Flips horizontally, e.g. to mirror face.
  269. //
  270. void
  271. V_DrawPatchFlipped
  272. ( int        x,
  273.   int        y,
  274.   int        scrn,
  275.   patch_t*    patch ) 
  276. { 
  277.  
  278.     int        count;
  279.     int        col; 
  280.     column_t*    column; 
  281.     byte*    desttop;
  282.     byte*    dest;
  283.     byte*    source; 
  284.     int        w; 
  285.      
  286.     y -= SHORT(patch->topoffset); 
  287.     x -= SHORT(patch->leftoffset); 
  288. #ifdef RANGECHECK 
  289.     if (x<0
  290.     ||x+SHORT(patch->width) >SCREENWIDTH
  291.     || y<0
  292.     || y+SHORT(patch->height)>SCREENHEIGHT 
  293.     || (unsigned)scrn>4)
  294.     {
  295.       fprintf( stderr, "Patch origin %d,%d exceeds LFB\n", x,y );
  296.       I_Error ("Bad V_DrawPatch in V_DrawPatchFlipped");
  297.     }
  298. #endif 
  299.  
  300.     if (!scrn)
  301.     V_MarkRect (x, y, SHORT(patch->width), SHORT(patch->height)); 
  302.  
  303.     col = 0; 
  304.     desttop = screens[scrn]+y*SCREENWIDTH+x; 
  305.      
  306.     w = SHORT(patch->width); 
  307.  
  308.     for ( ; col<w ; x++, col++, desttop++) 
  309.     { 
  310.     column = (column_t *)((byte *)patch + LONG(patch->columnofs[w-1-col])); 
  311.  
  312.     // step through the posts in a column 
  313.     while (column->topdelta != 0xff ) 
  314.     { 
  315.         source = (byte *)column + 3; 
  316.         dest = desttop + column->topdelta*SCREENWIDTH; 
  317.         count = column->length; 
  318.              
  319.         while (count--) 
  320.         { 
  321.         *dest = *source++; 
  322.         dest += SCREENWIDTH; 
  323.         } 
  324.         column = (column_t *)(  (byte *)column + column->length 
  325.                     + 4 ); 
  326.     } 
  327.     }             
  328. } 
  329.  
  330.  
  331.  
  332. //
  333. // V_DrawPatchDirect
  334. // Draws directly to the screen on the pc. 
  335. //
  336. void
  337. V_DrawPatchDirect
  338. ( int        x,
  339.   int        y,
  340.   int        scrn,
  341.   patch_t*    patch ) 
  342. {
  343.     V_DrawPatch (x,y,scrn, patch); 
  344.  
  345.     /*
  346.     int        count;
  347.     int        col; 
  348.     column_t*    column; 
  349.     byte*    desttop;
  350.     byte*    dest;
  351.     byte*    source; 
  352.     int        w; 
  353.      
  354.     y -= SHORT(patch->topoffset); 
  355.     x -= SHORT(patch->leftoffset); 
  356.  
  357. #ifdef RANGECHECK 
  358.     if (x<0
  359.     ||x+SHORT(patch->width) >SCREENWIDTH
  360.     || y<0
  361.     || y+SHORT(patch->height)>SCREENHEIGHT 
  362.     || (unsigned)scrn>4)
  363.     {
  364.     I_Error ("Bad V_DrawPatchDirect");
  365.     }
  366. #endif 
  367.  
  368.     //    V_MarkRect (x, y, SHORT(patch->width), SHORT(patch->height)); 
  369.     desttop = destscreen + y*SCREENWIDTH/4 + (x>>2); 
  370.      
  371.     w = SHORT(patch->width); 
  372.     for ( col = 0 ; col<w ; col++) 
  373.     { 
  374.     outp (SC_INDEX+1,1<<(x&3)); 
  375.     column = (column_t *)((byte *)patch + LONG(patch->columnofs[col])); 
  376.  
  377.     // step through the posts in a column 
  378.      
  379.     while (column->topdelta != 0xff ) 
  380.     { 
  381.         source = (byte *)column + 3; 
  382.         dest = desttop + column->topdelta*SCREENWIDTH/4; 
  383.         count = column->length; 
  384.  
  385.         while (count--) 
  386.         { 
  387.         *dest = *source++; 
  388.         dest += SCREENWIDTH/4; 
  389.         } 
  390.         column = (column_t *)(  (byte *)column + column->length 
  391.                     + 4 ); 
  392.     } 
  393.     if ( ((++x)&3) == 0 ) 
  394.         desttop++;    // go to next byte, not next plane 
  395.     }*/ 
  396. } 
  397.  
  398.  
  399.  
  400. //
  401. // V_DrawBlock
  402. // Draw a linear block of pixels into the view buffer.
  403. //
  404. void
  405. V_DrawBlock
  406. ( int        x,
  407.   int        y,
  408.   int        scrn,
  409.   int        width,
  410.   int        height,
  411.   byte*        src ) 
  412. { 
  413.     byte*    dest; 
  414.      
  415. #ifdef RANGECHECK 
  416.     if (x<0
  417.     ||x+width >SCREENWIDTH
  418.     || y<0
  419.     || y+height>SCREENHEIGHT 
  420.     || (unsigned)scrn>4 )
  421.     {
  422.     I_Error ("Bad V_DrawBlock");
  423.     }
  424. #endif 
  425.  
  426.     V_MarkRect (x, y, width, height); 
  427.  
  428.     dest = screens[scrn] + y*SCREENWIDTH+x; 
  429.  
  430.     while (height--) 
  431.     { 
  432.     memcpy (dest, src, width); 
  433.     src += width; 
  434.     dest += SCREENWIDTH; 
  435.     } 
  436. } 
  437.  
  438.  
  439.  
  440. //
  441. // V_GetBlock
  442. // Gets a linear block of pixels from the view buffer.
  443. //
  444. void
  445. V_GetBlock
  446. ( int        x,
  447.   int        y,
  448.   int        scrn,
  449.   int        width,
  450.   int        height,
  451.   byte*        dest ) 
  452. { 
  453.     byte*    src; 
  454.      
  455. #ifdef RANGECHECK 
  456.     if (x<0
  457.     ||x+width >SCREENWIDTH
  458.     || y<0
  459.     || y+height>SCREENHEIGHT 
  460.     || (unsigned)scrn>4 )
  461.     {
  462.     I_Error ("Bad V_DrawBlock");
  463.     }
  464. #endif 
  465.  
  466.     src = screens[scrn] + y*SCREENWIDTH+x; 
  467.  
  468.     while (height--) 
  469.     { 
  470.     memcpy (dest, src, width); 
  471.     src += SCREENWIDTH; 
  472.     dest += width; 
  473.     } 
  474. } 
  475.  
  476.  
  477.  
  478.  
  479. //
  480. // V_Init
  481. // 
  482. void V_Init (void) 
  483. { 
  484.     int        i;
  485.     byte*    base;
  486.         
  487.     // stick these in low dos memory on PCs
  488.  
  489.     base = I_AllocLow (SCREENWIDTH*SCREENHEIGHT*4);
  490.  
  491.     for (i=0 ; i<4 ; i++)
  492.     screens[i] = base + i*SCREENWIDTH*SCREENHEIGHT;
  493. }
  494.