/*********************************************************** * Copyright (C) 1997, Be Inc. All rights reserved. * * FILE: glutDstr.cpp * * DESCRIPTION: convert display string into a Be options variable ***********************************************************/ /*********************************************************** * Headers ***********************************************************/ #include <GL/glut.h> #include <string.h> #include <stdlib.h> #include "glutint.h" #include "glutState.h" /*********************************************************** * FUNCTION: glutInitDisplayString * * DESCRIPTION: sets the display string variable ***********************************************************/ void APIENTRY glutInitDisplayString(const char *string) { if (gState.displayString) { free(gState.displayString); } if (string) { gState.displayString = strdup(string); if (!gState.displayString) __glutFatalError("out of memory."); } else gState.displayString = NULL; } /*********************************************************** * FUNCTION: __glutConvertDisplayModeFromString * * DESCRIPTION: converts the current display mode into a BGLView * display mode, printing warnings as appropriate. * * PARAMETERS: if options is non-NULL, the current display mode is * returned in it. * * RETURNS: 1 if the current display mode is possible, else 0 ***********************************************************/ int __glutConvertDisplayModeFromString(unsigned long *options) { ulong newoptions = BGL_DOUBLE; gState.swapHack = true; // assume single buffered char *word = strtok(gState.displayString, " \t"); do { char *cstr = strpbrk(word, "=><!~"); if(cstr) *cstr = '\0'; // this is the most minimal possible parser. scan for // options that we support, and add them to newoptions // this will certainly cause it to accept things that we // don't actually support, but if we don't support it, the // program's probably not going to work anyway. if(!strcmp(word, "alpha")) { newoptions |= BGL_ALPHA; } else if((!strcmp(word, "acc")) || (!strcmp(word, "acca"))) { newoptions |= BGL_ACCUM; } else if(!strcmp(word, "depth")) { newoptions |= BGL_DEPTH; } else if(!strcmp(word, "double")) { gState.swapHack = false; } else if(!strcmp(word, "stencil")) { newoptions |= BGL_STENCIL; } } while((word = strtok(0, " \t")) != 0); if (options) *options = newoptions; return 1; // assume we support it }