void GLUTAPIENTRY
glutGameModeString(const char *string)
{
Criterion *criteria;
int ncriteria;
initGameModeSupport();
criteria = parseDisplayString(string, &ncriteria);
currentDm = findMatch(dmodes, ndmodes, criteria, ncriteria);
free(criteria);
}
void GLUTAPIENTRY
glutGameModeString(const char *string)
{
Criterion *criteria;
int ncriteria[4], requestedMask, queries = 1;
#if _WIN32
int bpp, width, height, hertz, n;
#endif
initGameModeSupport();
#if _WIN32
XHDC = GetDC(GetDesktopWindow());
bpp = GetDeviceCaps(XHDC, BITSPIXEL);
/* Note that Windows 95 and 98 systems always return zero
for VREFRESH so be prepared to ignore values of hertz
that are too low. */
hertz = GetDeviceCaps(XHDC, VREFRESH);
width = GetSystemMetrics(SM_CXSCREEN);
height = GetSystemMetrics(SM_CYSCREEN);
#endif
criteria = parseGameModeString(string, &ncriteria[0], &requestedMask);
#if _WIN32
/* Build an extra set of default queries. If no pixel depth is
explicitly specified, prefer a display mode that doesn't change
the display mode. Likewise for the width and height. Likewise for
the display frequency. */
n = ncriteria[0];
if (!(requestedMask & (1 << DM_PIXEL_DEPTH))) {
criteria[n].capability = DM_PIXEL_DEPTH;
criteria[n].comparison = EQ;
criteria[n].value = bpp;
n += 1;
ncriteria[queries] = n;
queries++;
}
if (!(requestedMask & ((1<<DM_WIDTH) | (1<<DM_HEIGHT)) )) {
criteria[n].capability = DM_WIDTH;
criteria[n].comparison = EQ;
criteria[n].value = width;
criteria[n].capability = DM_HEIGHT;
criteria[n].comparison = EQ;
criteria[n].value = height;
n += 2;
ncriteria[queries] = n;
queries++;
}
/* Assume a display frequency of less than 50 is to be ignored. */
if (hertz >= 50) {
if (!(requestedMask & (1 << DM_HERTZ))) {
criteria[n].capability = DM_HERTZ;
criteria[n].comparison = EQ;
criteria[n].value = hertz;
n += 1;
ncriteria[queries] = n;
queries++;
}
}
#endif
/* Perform multiple queries until one succeeds or no more queries. */
do {
queries--;
currentDm = findMatch(dmodes, ndmodes, criteria, ncriteria[queries]);
} while((currentDm == NULL) && (queries > 0));
free(criteria);
}
