glut_gamemode.c

mesa-6.5-minigui源码

      return -1;
    }
    bpp = (int) strtol(&word[1], &response, 0);
    if (response == &word[1]) {
      /* Not a valid number. */
      return -1;
    }
    criterion[0].capability = DM_PIXEL_DEPTH;
    criterion[0].comparison = EQ;
    criterion[0].value = bpp;
    got = specialCaseParse(response,
      &criterion[1], 1 << DM_WIDTH | 1 << DM_PIXEL_DEPTH);
    if (got >= 0) {
      return got + 1;
    } else {
      return -1;
    }
  case '@':
    /* The @HZ case. */
    if (mask & (1 << DM_HERTZ)) {
      return -1;
    }
    hertz = (int) strtol(&word[1], &response, 0);
    if (response == &word[1]) {
      /* Not a valid number. */
      return -1;
    }
    criterion[0].capability = DM_HERTZ;
    criterion[0].comparison = EQ;
    criterion[0].value = hertz;
    got = specialCaseParse(response,
      &criterion[1], ~DM_HERTZ);
    if (got >= 0) {
      return got + 1;
    } else {
      return -1;
    }
  case '\0':
    return 0;
  }
  return -1;
}

/* This routine is based on similiar code in glut_dstr.c */
static int
parseCriteria(char *word, Criterion * criterion)
{
  char *cstr, *vstr, *response;
  int comparator, value = 0;

  cstr = strpbrk(word, "=><!~");
  if (cstr) {
    switch (cstr[0]) {
    case '=':
      comparator = EQ;
      vstr = &cstr[1];
      break;
    case '~':
      comparator = MIN;
      vstr = &cstr[1];
      break;
    case '>':
      if (cstr[1] == '=') {
        comparator = GTE;
        vstr = &cstr[2];
      } else {
        comparator = GT;
        vstr = &cstr[1];
      }
      break;
    case '<':
      if (cstr[1] == '=') {
        comparator = LTE;
        vstr = &cstr[2];
      } else {
        comparator = LT;
        vstr = &cstr[1];
      }
      break;
    case '!':
      if (cstr[1] == '=') {
        comparator = NEQ;
        vstr = &cstr[2];
      } else {
        return -1;
      }
      break;
    default:
      return -1;
    }
    value = (int) strtol(vstr, &response, 0);
    if (response == vstr) {
      /* Not a valid number. */
      return -1;
    }
    *cstr = '\0';
  } else {
    comparator = NONE;
  }
  switch (word[0]) {
  case 'b':
    if (!strcmp(word, "bpp")) {
      criterion[0].capability = DM_PIXEL_DEPTH;
      if (comparator == NONE) {
        return -1;
      } else {
        criterion[0].comparison = comparator;
        criterion[0].value = value;
        return 1;
      }
    }
    return -1;
  case 'h':
    if (!strcmp(word, "height")) {
      criterion[0].capability = DM_HEIGHT;
      if (comparator == NONE) {
        return -1;
      } else {
        criterion[0].comparison = comparator;
        criterion[0].value = value;
        return 1;
      }
    }
    if (!strcmp(word, "hertz")) {
      criterion[0].capability = DM_HERTZ;
      if (comparator == NONE) {
        return -1;
      } else {
        criterion[0].comparison = comparator;
        criterion[0].value = value;
        return 1;
      }
    }
    return -1;
  case 'n':
    if (!strcmp(word, "num")) {
      criterion[0].capability = DM_NUM;
      if (comparator == NONE) {
        return -1;
      } else {
        criterion[0].comparison = comparator;
        criterion[0].value = value;
        return 1;
      }
    }
    return -1;
  case 'w':
    if (!strcmp(word, "width")) {
      criterion[0].capability = DM_WIDTH;
      if (comparator == NONE) {
        return -1;
      } else {
        criterion[0].comparison = comparator;
        criterion[0].value = value;
        return 1;
      }
    }
    return -1;
  }
  if (comparator == NONE) {
    return specialCaseParse(word, criterion, 0);
  }
  return -1;
}

/* This routine is based on similiar code in glut_dstr.c */
static Criterion *
parseDisplayString(const char *display, int *ncriteria)
{
  Criterion *criteria = NULL;
  int n, parsed;
  char *copy, *word;

  copy = __glutStrdup(display);
  /* Attempt to estimate how many criteria entries should be
     needed. */
  n = 0;
  word = strtok(copy, " \t");
  while (word) {
    n++;
    word = strtok(NULL, " \t");
  }
  /* Allocate number of words of criteria.  A word
     could contain as many as four criteria in the
     worst case.  Example: 800x600:16@60 */
  criteria = (Criterion *) malloc(4 * n * sizeof(Criterion));
  if (!criteria) {
    __glutFatalError("out of memory.");
  }

  /* Re-copy the copy of the display string. */
  strcpy(copy, display);

  n = 0;
  word = strtok(copy, " \t");
  while (word) {
    parsed = parseCriteria(word, &criteria[n]);
    if (parsed >= 0) {
      n += parsed;
    } else {
      __glutWarning("Unrecognized game mode string word: %s (ignoring)\n", word);
    }
    word = strtok(NULL, " \t");
  }

  free(copy);
  *ncriteria = n;
  return criteria;
}

void GLUTAPIENTRY
glutGameModeString(const char *string)
{
  Criterion *criteria;
  int ncriteria;

  initGameModeSupport();
  criteria = parseDisplayString(string, &ncriteria);
  currentDm = findMatch(dmodes, ndmodes, criteria, ncriteria);
  free(criteria);
}

int GLUTAPIENTRY
glutEnterGameMode(void)
{
  GLUTwindow *window;
  int width, height;
  Window win;

  if (__glutMappedMenu) {
    __glutFatalUsage("entering game mode not allowed while menus in use");
  }
  if (__glutGameModeWindow) {
    /* Already in game mode, so blow away game mode
       window so apps can change resolutions. */
    window = __glutGameModeWindow;
    /* Setting the game mode window to NULL tricks
       the window destroy code into not undoing the
       screen display change since we plan on immediately
       doing another mode change. */
    __glutGameModeWindow = NULL;
    __glutDestroyWindow(window, window);
  }

  /* Assume default screen size until we find out if we
     can actually change the display settings. */
  width = __glutScreenWidth;
  height = __glutScreenHeight;

  if (currentDm) {
#ifdef _WIN32
    LONG status;
    static int registered = 0;

    status = ChangeDisplaySettings(&currentDm->devmode,
      CDS_FULLSCREEN);
    if (status == DISP_CHANGE_SUCCESSFUL) {
      __glutDisplaySettingsChanged = 1;
      width = currentDm->cap[DM_WIDTH];
      height = currentDm->cap[DM_HEIGHT];
      if (!registered) {
        atexit(__glutCloseDownGameMode);
        registered = 1;
      }
    } else {
      /* Switch back to default resolution. */
      ChangeDisplaySettings(NULL, 0);
    }
#endif
  }

  window = __glutCreateWindow(NULL, 0, 0,
    width, height, /* game mode */ 1);
  win = window->win;

#if !defined(_WIN32)
  if (__glutMotifHints == None) {
    __glutMotifHints = XSGIFastInternAtom(__glutDisplay, "_MOTIF_WM_HINTS",
      SGI_XA__MOTIF_WM_HINTS, 0);
    if (__glutMotifHints == None) {
      __glutWarning("Could not intern X atom for _MOTIF_WM_HINTS.");
    }
  }

  /* Game mode window is a toplevel window. */
  XSetWMProtocols(__glutDisplay, win, &__glutWMDeleteWindow, 1);
#endif

  /* Schedule the fullscreen property to be added and to
     make sure the window is configured right.  Win32
     doesn't need this. */
  window->desiredX = 0;
  window->desiredY = 0;
  window->desiredWidth = width;
  window->desiredHeight = height;
  window->desiredConfMask |= CWX | CWY | CWWidth | CWHeight;
#ifdef _WIN32
  /* Win32 does not want to use GLUT_FULL_SCREEN_WORK
     for game mode because we need to be maximizing
     the window in game mode, not just sizing it to
     take up the full screen.  The Win32-ness of game
     mode happens when you pass 1 in the gameMode parameter
     to __glutCreateWindow above.  A gameMode of creates
     a WS_POPUP window, not a standard WS_OVERLAPPEDWINDOW
     window.  WS_POPUP ensures the taskbar is hidden. */
  __glutPutOnWorkList(window,
    GLUT_CONFIGURE_WORK);
#else
  __glutPutOnWorkList(window,
    GLUT_CONFIGURE_WORK | GLUT_FULL_SCREEN_WORK);
#endif

  __glutGameModeWindow = window;
  return window->num + 1;
}

int GLUTAPIENTRY
glutGameModeGet(GLenum mode)
{
  switch (mode) {
  case GLUT_GAME_MODE_ACTIVE:
    return __glutGameModeWindow != NULL;
  case GLUT_GAME_MODE_POSSIBLE:
    return currentDm != NULL;
  case GLUT_GAME_MODE_WIDTH:
    return currentDm ? currentDm->cap[DM_WIDTH] : -1;
  case GLUT_GAME_MODE_HEIGHT:
    return currentDm ? currentDm->cap[DM_HEIGHT] : -1;
  case GLUT_GAME_MODE_PIXEL_DEPTH:
    return currentDm ? currentDm->cap[DM_PIXEL_DEPTH] : -1;
  case GLUT_GAME_MODE_REFRESH_RATE:
    return currentDm ? currentDm->cap[DM_HERTZ] : -1;
  case GLUT_GAME_MODE_DISPLAY_CHANGED:
    return __glutDisplaySettingsChanged;
  default:
    return -1;
  }
}