/*ARGSUSED*/
static void
ApplyCallback(Widget w, XtPointer call_data, XtPointer client_data)
{
hitError = 0;
XF86VidModeModModeLine(XtDisplay(w), vidtune->screen, &modeline);
XSync(XtDisplay(w), False);
if (hitError) {
if (repeater != NULL) {
XtCallActionProc(repeater, "unset", NULL, NULL, 0);
XtCallActionProc(repeater, "stop", NULL, NULL, 0);
repeater = NULL;
}
XBell(XtDisplay(w), 80);
if (timeout)
StopTestCallback(w, NULL, NULL);
GetModeLine(False);
SetLabels();
}
}
float PsychSetNominalFramerate(int screenNumber, float requestedHz)
{
// Information returned by/sent to the XF86VidModeExtension:
XF86VidModeModeLine mode_line; // The mode line of the current video mode.
int dot_clock; // The RAMDAC / TDMS pixel clock frequency.
int rc;
int event_base;
// We start with a default vrefresh of zero, which means "couldn't query refresh from OS":
float vrefresh = 0;
if(screenNumber>=numDisplays)
PsychErrorExitMsg(PsychError_internal, "screenNumber is out of range");
if (!XF86VidModeSetClientVersion(displayCGIDs[screenNumber])) {
// Failed to use VidMode-Extension. We just return a vrefresh of zero.
return(0);
}
if (!XF86VidModeQueryExtension(displayCGIDs[screenNumber], &event_base, &x11_errorbase)) {
// Failed to use VidMode-Extension. We just return a vrefresh of zero.
return(0);
}
// Attach our error callback handler and reset error-state:
x11_errorval = 0;
x11_olderrorhandler = XSetErrorHandler(x11VidModeErrorHandler);
// Step 1: Query current dotclock and modeline:
if (!XF86VidModeGetModeLine(displayCGIDs[screenNumber], PsychGetXScreenIdForScreen(screenNumber), &dot_clock, &mode_line)) {
// Restore default error handler:
XSetErrorHandler(x11_olderrorhandler);
PsychErrorExitMsg(PsychError_internal, "Failed to query video dotclock and modeline!");
}
// Step 2: Calculate updated modeline:
if (requestedHz > 10) {
// Step 2-a: Given current dot-clock and modeline and requested vrefresh, compute
// modeline for closest possible match:
requestedHz*=1000.0f;
vrefresh = (((dot_clock * 1000) / mode_line.htotal) * 1000) / requestedHz;
// Assign it to closest modeline setting:
mode_line.vtotal = (int)(vrefresh + 0.5f);
}
else {
// Step 2-b: Delta mode. requestedHz represents a direct integral offset
// to add or subtract from current modeline setting:
mode_line.vtotal+=(int) requestedHz;
}
// Step 3: Try to set new modeline:
if (!XF86VidModeModModeLine(displayCGIDs[screenNumber], PsychGetXScreenIdForScreen(screenNumber), &mode_line)) {
// Restore default error handler:
XSetErrorHandler(x11_olderrorhandler);
// Invalid modeline? Signal this:
return(-1);
}
// We synchronize and wait for X-Request completion. If the modeline was invalid,
// this will trigger an invocation of our errorhandler, which in turn will
// set the x11_errorval to a non-zero value:
XSync(displayCGIDs[screenNumber], FALSE);
// Restore default error handler:
XSetErrorHandler(x11_olderrorhandler);
// Check for error:
if (x11_errorval) {
// Failed to set new mode! Must be invalid. We return -1 to signal this:
return(-1);
}
// No error...
// Step 4: Query new settings and return them:
vrefresh = PsychGetNominalFramerate(screenNumber);
// Done.
return(vrefresh);
}
