base/v_video.c

   1
   2 // V_video.c
   3
   4 #include "doomdef.h"
   5
   6 #define SC_INDEX 0x3c4
   7
   8 byte *screen;
   9 int dirtybox[4];
  10 int usegamma;
  11
  12 byte gammatable[5][256] =
  13 {
  14 {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255},
  15
  16 {2,4,5,7,8,10,11,12,14,15,16,18,19,20,21,23,24,25,26,27,29,30,31,32,33,34,36,37,38,39,40,41,42,44,45,46,47,48,49,50,51,52,54,55,56,57,58,59,60,61,62,63,64,65,66,67,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,163,164,165,166,167,168,169,170,171,172,173,174,175,175,176,177,178,179,180,181,182,183,184,185,186,186,187,188,189,190,191,192,193,194,195,196,196,197,198,199,200,201,202,203,204,205,205,206,207,208,209,210,211,212,213,214,214,215,216,217,218,219,220,221,222,222,223,224,225,226,227,228,229,230,230,231,232,233,234,235,236,237,237,238,239,240,241,242,243,244,245,245,246,247,248,249,250,251,252,252,253,254,255},
  17
  18 {4,7,9,11,13,15,17,19,21,22,24,26,27,29,30,32,33,35,36,38,39,40,42,43,45,46,47,48,50,51,52,54,55,56,57,59,60,61,62,63,65,66,67,68,69,70,72,73,74,75,76,77,78,79,80,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,133,134,135,136,137,138,139,140,141,142,143,144,144,145,146,147,148,149,150,151,152,153,153,154,155,156,157,158,159,160,160,161,162,163,164,165,166,166,167,168,169,170,171,172,172,173,174,175,176,177,178,178,179,180,181,182,183,183,184,185,186,187,188,188,189,190,191,192,193,193,194,195,196,197,197,198,199,200,201,201,202,203,204,205,206,206,207,208,209,210,210,211,212,213,213,214,215,216,217,217,218,219,220,221,221,222,223,224,224,225,226,227,228,228,229,230,231,231,232,233,234,235,235,236,237,238,238,239,240,241,241,242,243,244,244,245,246,247,247,248,249,250,251,251,252,253,254,254,255},
  19
  20 {8,12,16,19,22,24,27,29,31,34,36,38,40,41,43,45,47,49,50,52,53,55,57,58,60,61,63,64,65,67,68,70,71,72,74,75,76,77,79,80,81,82,84,85,86,87,88,90,91,92,93,94,95,96,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,135,136,137,138,139,140,141,142,143,143,144,145,146,147,148,149,150,150,151,152,153,154,155,155,156,157,158,159,160,160,161,162,163,164,165,165,166,167,168,169,169,170,171,172,173,173,174,175,176,176,177,178,179,180,180,181,182,183,183,184,185,186,186,187,188,189,189,190,191,192,192,193,194,195,195,196,197,197,198,199,200,200,201,202,202,203,204,205,205,206,207,207,208,209,210,210,211,212,212,213,214,214,215,216,216,217,218,219,219,220,221,221,222,223,223,224,225,225,226,227,227,228,229,229,230,231,231,232,233,233,234,235,235,236,237,237,238,238,239,240,240,241,242,242,243,244,244,245,246,246,247,247,248,249,249,250,251,251,252,253,253,254,254,255},
  21
  22 {16,23,28,32,36,39,42,45,48,50,53,55,57,60,62,64,66,68,69,71,73,75,76,78,80,81,83,84,86,87,89,90,92,93,94,96,97,98,100,101,102,103,105,106,107,108,109,110,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,128,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,143,144,145,146,147,148,149,150,150,151,152,153,154,155,155,156,157,158,159,159,160,161,162,163,163,164,165,166,166,167,168,169,169,170,171,172,172,173,174,175,175,176,177,177,178,179,180,180,181,182,182,183,184,184,185,186,187,187,188,189,189,190,191,191,192,193,193,194,195,195,196,196,197,198,198,199,200,200,201,202,202,203,203,204,205,205,206,207,207,208,208,209,210,210,211,211,212,213,213,214,214,215,216,216,217,217,218,219,219,220,220,221,221,222,223,223,224,224,225,225,226,227,227,228,228,229,229,230,230,231,232,232,233,233,234,234,235,235,236,236,237,237,238,239,239,240,240,241,241,242,242,243,243,244,244,245,245,246,246,247,247,248,248,249,249,250,250,251,251,252,252,253,254,254,255,255}
  23 };
  24
  25 //---------------------------------------------------------------------------
  26 //
  27 // PROC V_DrawPatch
  28 //
  29 // Draws a column based masked pic to the screen.
  30 //
  31 //---------------------------------------------------------------------------
  32
  33 void V_DrawPatch(int x, int y, patch_t *patch)
  34 {
  35         int count;
  36         int col;
  37         column_t *column;
  38         byte *desttop;
  39         byte *dest;
  40         byte *source;
  41         int w;
  42
  43         y -= SHORT(patch->topoffset);
  44         x -= SHORT(patch->leftoffset);
  45         if(x < 0 || x+SHORT(patch->width) > SCREENWIDTH || y < 0
  46                 || y+SHORT(patch->height) > SCREENHEIGHT)
  47         {
  48                 I_Error("Bad V_DrawPatch");
  49         }
  50         col = 0;
  51         desttop = screen+y*SCREENWIDTH+x;
  52         w = SHORT(patch->width);
  53         for(; col < w; x++, col++, desttop++)
  54         {
  55                 column = (column_t *)((byte *)patch+LONG(patch->columnofs[col]));
  56                 // Step through the posts in a column
  57                 while(column->topdelta != 0xff)
  58                 {
  59                         source = (byte *)column+3;
  60                         dest = desttop+column->topdelta*SCREENWIDTH;
  61                         count = column->length;
  62                         while(count--)
  63                         {
  64                                 *dest = *source++;
  65                                 dest += SCREENWIDTH;
  66                         }
  67                         column = (column_t *)((byte *)column+column->length+4);
  68                 }
  69         }
  70 }
  71
  72 /*
  73 ==================
  74 =
  75 = V_DrawFuzzPatch
  76 =
  77 = Masks a column based translucent masked pic to the screen.
  78 =
  79 ==================
  80 */
  81 extern byte *tinttable;
  82
  83 void V_DrawFuzzPatch (int x, int y, patch_t *patch)
  84 {
  85         int                     count,col;
  86         column_t        *column;
  87         byte            *desttop, *dest, *source;
  88         int                     w;
  89
  90         y -= SHORT(patch->topoffset);
  91         x -= SHORT(patch->leftoffset);
  92
  93         if (x<0||x+SHORT(patch->width) >SCREENWIDTH || y<0 || y+SHORT(patch->height)>SCREENHEIGHT)
  94                 I_Error ("Bad V_DrawPatch");
  95
  96         col = 0;
  97         desttop = screen+y*SCREENWIDTH+x;
  98
  99         w = SHORT(patch->width);
 100         for ( ; col<w ; x++, col++, desttop++)
 101         {
 102                 column = (column_t *)((byte *)patch + LONG(patch->columnofs[col]));
 103
 104 // step through the posts in a column
 105
 106                 while (column->topdelta != 0xff )
 107                 {
 108                         source = (byte *)column + 3;
 109                         dest = desttop + column->topdelta*SCREENWIDTH;
 110                         count = column->length;
 111
 112                         while (count--)
 113                         {
 114                                 *dest = tinttable[((*dest)<<8) + *source++];
 115                                 dest += SCREENWIDTH;
 116                         }
 117                         column = (column_t *)(  (byte *)column + column->length
 118 + 4 );
 119                 }
 120         }
 121 }
 122
 123 /*
 124 ==================
 125 =
 126 = V_DrawShadowedPatch
 127 =
 128 = Masks a column based masked pic to the screen.
 129 =
 130 ==================
 131 */
 132
 133 void V_DrawShadowedPatch(int x, int y, patch_t *patch)
 134 {
 135         int                     count,col;
 136         column_t        *column;
 137         byte            *desttop, *dest, *source;
 138         byte            *desttop2, *dest2;
 139         int                     w;
 140
 141         y -= SHORT(patch->topoffset);
 142         x -= SHORT(patch->leftoffset);
 143
 144         if (x<0||x+SHORT(patch->width) >SCREENWIDTH || y<0 || y+SHORT(patch->height)>SCREENHEIGHT)
 145                 I_Error ("Bad V_DrawPatch");
 146
 147         col = 0;
 148         desttop = screen+y*SCREENWIDTH+x;
 149         desttop2 = screen+(y+2)*SCREENWIDTH+x+2;
 150
 151         w = SHORT(patch->width);
 152         for ( ; col<w ; x++, col++, desttop++, desttop2++)
 153         {
 154                 column = (column_t *)((byte *)patch + LONG(patch->columnofs[col]));
 155
 156 // step through the posts in a column
 157
 158                 while (column->topdelta != 0xff )
 159                 {
 160                         source = (byte *)column + 3;
 161                         dest = desttop + column->topdelta*SCREENWIDTH;
 162                         dest2 = desttop2 + column->topdelta*SCREENWIDTH;
 163                         count = column->length;
 164
 165                         while (count--)
 166                         {
 167                                 *dest2 = tinttable[((*dest2)<<8)];
 168                                 dest2 += SCREENWIDTH;
 169                                 *dest = *source++;
 170                                 dest += SCREENWIDTH;
 171
 172                         }
 173                         column = (column_t *)(  (byte *)column + column->length
 174 + 4 );
 175                 }
 176         }
 177 }
 178
 179 //---------------------------------------------------------------------------
 180 //
 181 // PROC V_DrawRawScreen
 182 //
 183 //---------------------------------------------------------------------------
 184
 185 void V_DrawRawScreen(byte *raw)
 186 {
 187         memcpy(screen, raw, SCREENWIDTH*SCREENHEIGHT);
 188 }
 189
 190 //---------------------------------------------------------------------------
 191 //
 192 // PROC V_Init
 193 //
 194 //---------------------------------------------------------------------------
 195
 196 void V_Init(void)
 197 {
 198         // I_AllocLow will put screen in low dos memory on PCs.
 199         screen = I_AllocLow(SCREENWIDTH*SCREENHEIGHT);
 200 }