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function dacBits = ScreenDacBits(w)
% dacBits = ScreenDacBits(windowPtrOrScreenNumber)
%
% What is the precision of the DACs on this graphics card?
%
% At present you need to know the bit depth of your graphics board's DAC
% to determine how to write its CLUT, i.e. Screen 'SetClut' or 'Gamma'.
% Use this routine and ScreenUsesHighGammaBits, instead of the the brand-
% and platform-specific IsRadiusThunder10 and IsATIRadeon10, to keep your
% program as general as possible, not tied to particular hardware or
% platform.
%
% The value is set in PrepareScreen.m.
%
% See also LoadClut, ScreenPixelSize, ScreenUsesHighGammaBits, ScreenClutSize.
% 2/27/02 dhb,ly Wrote it.
% 3/20/02 dgp Cosmetic.
% 3/26/02 dhb Gen2 Radeon card check.
% 6/6/02 dgp Renamed DriverDacBits. When we don't know dacBits, ask the driver.
% 6/7/02 dgp Cache the answer.
% 6/8/02 dgp Renamed ScreenDacBits.
% 6/20/02 dgp Moved all code to PrepareScreen.m.
% 10/10/06 dhb Just always return 8 bits, until we figure out how to update.
% 05/21/07 mk Return queried dac size from screen. This will return 8
% bits if it can't query real dac size.
global g_usebitspp;
% If the global flag for using Bits++ is empty, then it hasn't been
% initialized and default it to 0.
if isempty(g_usebitspp)
g_usebitspp = 0;
end
% dacBits=Screen(w,'Preference','DacBits');
%dacBits = 8;
if g_usebitspp
dacBits = 14;
else
[gammatable, dacBits, reallutsize] = Screen('ReadNormalizedGammaTable', w);
end
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