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function hz=FrameRate(windowOrScreenNumber)
% hz=FrameRate([windowOrScreenNumber])
%
% Returns accurate frame rate of window or screen. Default is the main
% screen. The windowOrScreenNumber and frame rate are cached so subsequent
% calls after the first take no time at all.
% See also "Screen GetFlipInterval?"
% 11/8/06 dgp Wrote it.
persistent hzInFrameRate
persistent wInFrameRate
if nargin<1
windowOrScreenNumber=0;
end
AssertOpenGL;
if ismember(windowOrScreenNumber,wInFrameRate)
% Use cached frame rate.
[ok,n]=ismember(windowOrScreenNumber,wInFrameRate);
hz=hzInFrameRate(n);
return
end
% Not in cache, so measure it.
if ismember(windowOrScreenNumber,Screen('Screens'))
w=Screen('OpenWindow',windowOrScreenNumber);
hz=1/Screen('GetFlipInterval',w);
Screen('Close',w);
elseif ismember(windowOrScreenNumber,Screen('Windows'))
hz=1/Screen('GetFlipInterval',windowOrScreenNumber);
else
error('Illegal windowOrScreenNumber value %.0f',windowOrScreenNumber);
end
% Add it to cache.
wInFrameRate(end+1)=windowOrScreenNumber;
hzInFrameRate(end+1)=hz;
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