src/glut/beos/glutDstr.cpp

   1 /***********************************************************
   2  *      Copyright (C) 1997, Be Inc.  All rights reserved.
   3  *
   4  *  FILE:       glutDstr.cpp
   5  *
   6  *      DESCRIPTION:    convert display string into a Be options variable
   7  ***********************************************************/
   8
   9 /***********************************************************
  10  *      Headers
  11  ***********************************************************/
  12 #include <GL/glut.h>
  13 #include <string.h>
  14 #include <stdlib.h>
  15 #include "glutint.h"
  16 #include "glutState.h"
  17
  18 /***********************************************************
  19  *      FUNCTION:       glutInitDisplayString
  20  *
  21  *      DESCRIPTION:  sets the display string variable
  22  ***********************************************************/
  23 void APIENTRY
  24 glutInitDisplayString(const char *string)
  25 {
  26   if (gState.displayString) {
  27     free(gState.displayString);
  28   }
  29   if (string) {
  30     gState.displayString = strdup(string);
  31     if (!gState.displayString)
  32       __glutFatalError("out of memory.");
  33   } else
  34     gState.displayString = NULL;
  35 }
  36
  37 /***********************************************************
  38  *      FUNCTION:       __glutConvertDisplayModeFromString
  39  *
  40  *      DESCRIPTION:  converts the current display mode into a BGLView
  41  *              display mode, printing warnings as appropriate.
  42  *
  43  *      PARAMETERS:      if options is non-NULL, the current display mode is
  44  *              returned in it.
  45  *
  46  *      RETURNS:        1 if the current display mode is possible, else 0
  47  ***********************************************************/
  48 int __glutConvertDisplayModeFromString(unsigned long *options) {
  49         ulong newoptions = BGL_DOUBLE;
  50         gState.swapHack = true;         // assume single buffered
  51
  52         char *word = strtok(gState.displayString, " \t");
  53         do {
  54                 char *cstr = strpbrk(word, "=><!~");
  55                 if(cstr)
  56                         *cstr = '\0';
  57                 // this is the most minimal possible parser.  scan for
  58                 // options that we support, and add them to newoptions
  59                 // this will certainly cause it to accept things that we
  60                 // don't actually support, but if we don't support it, the
  61                 // program's probably not going to work anyway.
  62                 if(!strcmp(word, "alpha")) {
  63                         newoptions |= BGL_ALPHA;
  64                 } else if((!strcmp(word, "acc")) || (!strcmp(word, "acca"))) {
  65                         newoptions |= BGL_ACCUM;
  66                 } else if(!strcmp(word, "depth")) {
  67                         newoptions |= BGL_DEPTH;
  68                 } else if(!strcmp(word, "double")) {
  69                         gState.swapHack = false;
  70                 } else if(!strcmp(word, "stencil")) {
  71                         newoptions |= BGL_STENCIL;
  72                 }
  73         } while((word = strtok(0, " \t")) != 0);
  74
  75         if (options)
  76                 *options = newoptions;
  77
  78         return 1;       // assume we support it
  79 }