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function nrslots = CountSlotsInGLOperator(gloperator)
% nrslots = CountSlotsInGLOperator(gloperator)
%
% Returns number of processing slots (== individual processing operations)
% in the given GL image processing operator 'gloperator'.
% History:
% 08/11/07 Written (MK).
if nargin < 1 || isempty(gloperator) || Screen('WindowKind', gloperator)~=4
error('You must provide the handle of a valid GL imaging operator ''gloperator''!');
end
nrslots = 0;
while(1)
if Screen('Hookfunction', gloperator, 'Query', 'UserDefinedBlit', nrslots)~=-1
nrslots = nrslots + 1;
else
break;
end
end
return;
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