jra@BRL.MIL ("John R. Anderson", VLD/ASB) (03/20/90)
I am trying to use the "setmonitor" routine to switch our 4D to
30 Hz, sync on green mode while I grab the video with another device.
I wrote a very simple program to attempt this:
#include <gl/gl.h>
#include <gl/get.h>
main()
{
short mtype;
int ch;
mtype = HZ30_SG;
setmonitor( mtype ); /* switch to 30 Hz */
while( (ch=getchar()) != '\n' ); /* wait for a CR */
mtype = HZ60;
setmonitor( mtype ); /* switch back to normal */
}
It compiles nicely, but upon execution I get an "invalid argument" error
message from both "setmonitor" calls. Anyone run into this before?? Any
ideas on why this desn't work??
Thanks,
-Johnroot@sgzh.uucp (Bruno Pape) (03/20/90)
#include <gl/gl.h>
#include <gl/get.h>
main()
{
short mtype;
int ch;
ginit();
mtype = HZ30_SG;
setmonitor( mtype ); /* switch to 30 Hz */
sleep(5);
mtype = HZ60;
setmonitor( mtype ); /* switch back to normal */
}
It compiles nicely, but upon execution I get an "invalid argument" error
message from both "setmonitor" calls. Anyone run into this before?? Any
ideas on why this desn't work??
Thanks,
-John
The ginit() should help it work better.
Bruno" ratcliffe) (03/20/90)
In article <1990Mar20.090310.4802@sgzh.uucp> root@sgzh.UUCP (Bruno Pape) writes: >> In article <....> John ______________ writes: >> #include <gl/gl.h> >> #include <gl/get.h> >> >> main() { >> short mtype; >> int ch; >> >> ginit(); >> mtype = HZ30_SG; >> setmonitor( mtype ); /* switch to 30 Hz */ >> sleep(5); >> mtype = HZ60; >> setmonitor( mtype ); /* switch back to normal */ >> } >> >>It compiles nicely, but upon execution I get an "invalid argument" error >>message from both "setmonitor" calls. Anyone run into this before?? Any >>ideas on why this desn't work?? >> Thanks, -John > >The ginit() should help it work better. > > Bruno however, since all you are indicating you wish to do here is set yer monitor to a different mode than 60Hz, ginit(), is NOT an optimal/"state of the art" choice. ginit() was the original "o.k. it's time to initialize grafix, ms. grafix pipe" signal to prepare the geometry pipe for incoming grafix commands and data back in GL1 days on the 1000 terminals and workstations BEFORE the primitive "mex" window manager was implemented. GINIT(3G) was implemented to take over the whole grafix console screen and NOT be a moveable/resizeable GL window. Then when "mex" came along, first GETPORT(3G), and then WINOPEN(3G) (we'll skip GBEGIN(3G) in this discussion.) became the standard way of opening multiple GL windows that were capable of "co-existing" with each other. (getport() was the first such attempt at this, as it is indeed a movable/resizeable window, but you can only open one per GL program. contrasted to this was the fully evolved winopen which lets you open more than one window per GL prog and switch back and forth as you need to drawing first into window A, then into window E, and then window ___..., etc.). so much for the history lesson. all of that is a preamble to what i wud recommend you *really* want to do in the above prog. which is replace "ginit();" w/the sequence: noport(); winopen("set monitor to 30Hz"); this use of noport *prior* to winopen is a rather swank trick which enables one to initialize grafix (the necessary pre-requisite to successful invocation of 98.5% of all GL calls) *without* having to open a window if one does not explicitly need to do so. the above sequence is the standard approach when needing to modify [a piece of] the colormap, changing monitor mode(s), etc.. -- daveus rattus yer friendly neighborhood ratman KOYAANISQATSI ko.yan.nis.qatsi (from the Hopi Language) n. 1. crazy life. 2. life in turmoil. 3. life out of balance. 4. life disintegrating. 5. a state of life that calls for another way of living.