Source/Stereo.cpp

   1
   2 #include "Game.h"
   3 #include "Stereo.h"
   4
   5
   6 extern int kContextWidth;
   7 extern int kContextHeight;
   8
   9 bool CanInitStereo(StereoMode mode) {
  10         GLint stencilbits = 0;
  11
  12         switch(mode) {
  13                 case stereoNone:
  14                         return true;
  15                         break;
  16                 case stereoAnaglyph:
  17                         return true;
  18                         break;
  19                 case stereoHorizontalInterlaced:
  20                 case stereoVerticalInterlaced:
  21                         glGetIntegerv(GL_STENCIL_BITS, &stencilbits);
  22                         if ( stencilbits < 1 ) {
  23                                 fprintf(stderr, "Failed to get a stencil buffer, interlaced stereo not available.\n");
  24                                 return false;
  25                         } else {
  26                                 fprintf(stderr, "Stencil buffer has %i bits, good.\n", stencilbits);
  27                         }
  28
  29                 default:
  30                         return false;
  31         }
  32
  33 }
  34
  35 void InitStereo(StereoMode mode) {
  36         switch(mode) {
  37                 case stereoNone:
  38                         return;
  39                 case stereoAnaglyph:
  40                         return;
  41                 case stereoHorizontalInterlaced:
  42                 case stereoVerticalInterlaced:
  43
  44                         fprintf(stderr, "Screen width is %i, height is %i\n", kContextWidth, kContextHeight);
  45
  46                         glEnable( GL_STENCIL_TEST);
  47                         glClearStencil(0);
  48                         glClear(  GL_STENCIL_BUFFER_BIT );
  49                         glStencilFunc(GL_ALWAYS, 0x1, 0x1);
  50                         glStencilOp(GL_REPLACE, GL_REPLACE, GL_REPLACE);
  51
  52
  53                         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  54                         glPixelStorei(GL_UNPACK_ROW_LENGTH, 3);
  55                         glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
  56                         glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
  57                         glColorMask( 1.0, 1.0, 1.0, 1.0 );
  58                         char stencil[] = {64,127,255};
  59
  60                         glViewport(0,0, kContextWidth, kContextHeight);
  61                         glMatrixMode(GL_PROJECTION);
  62                         glLoadIdentity();
  63                         glOrtho((GLdouble)0, (GLdouble)kContextWidth, (GLdouble)kContextHeight, 0, -1, 1);
  64                         glMatrixMode(GL_MODELVIEW);
  65                         glLoadIdentity();
  66
  67                         for(int y=0;y<kContextHeight;y+=2) {
  68
  69                                 for(int x=0;x<kContextWidth;x++) {
  70                                         glRasterPos2i(x, y);
  71                                         glDrawPixels(1, 1, GL_RGB, GL_UNSIGNED_BYTE, &stencil);
  72                                 }
  73                         }
  74
  75                         glStencilFunc(GL_NOTEQUAL, 0x01, 0x01);
  76                         glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
  77
  78                         // Something gets screwed up due to the changes above
  79                         // revert to default.
  80                         glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
  81                         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
  82                         glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
  83                         glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
  84         }
  85
  86 }