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function cal = DropCalBits(cal,whichScreen,forceBits)
% cal = DropCalBits(cal,whichScreen,[forceBit])
%
% Drops the bitdepth of a calibration file if
% necessary. Useful for running programs
% transparently on 8 and 10 bit hardware.
%
% If arg forceBits is passed, it is used as
% the current hardware depth. Otherwise the
% reported DACBits of whichScreen is used.
%
% This code assumes calibration was done at
% equally spaced levels in RGB settings, as is
% the case with our calibration routines. May
% not generalize, and I haven't worried about
% the roundoff errors. Certainly OK for basic
% use.
%
% 2/13/05 dhb Wrote it.
% Get hardware dac level. Note that the application
% code should use LoadClut, not SetClut, to access
% full bit depth.
if (nargin > 2 && ~isempty(forceBits))
hardwareBits = forceBits;
else
hardwareBits = Screen(whichScreen,'Preference','DACBits');
end
% Force calibration down to 8 bits, which is how we plan to use it.
% Simply refit raw data at correct number of input levels.
if (cal.describe.dacsize > hardwareBits)
cal.describe.dacsize = hardwareBits;
nInputLevels = 2^cal.describe.dacsize;
cal.rawdata.rawGammaInput = round(linspace(nInputLevels/cal.describe.nMeas,nInputLevels-1,cal.describe.nMeas))';
cal = CalibrateFitGamma(cal);
elseif (cal.describe.dacsize < hardwareBits)
error('Current hardware has greater bit depth than at calibration.');
end
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