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function pixels = glmGetPixels( rect )
% glmGetPixels Read packed pixels from the screen
%
% usage: pixels = glmGetPixels( rect )
% 01-Jan-2006 -- created (RFM)
% ---allocate---
% ---protected---
if nargin~=1,
error('invalid number of arguments');
end
% set parameters
global GL
format=GL.RGB;
type=GL.UNSIGNED_BYTE;
width=rect(3)-rect(1);
height=rect(4)-rect)2);
% allocate return argument
padn=mod( 4-mod(3*width,4) , 4 );
n=(width+padn)*height+8;
pixels=uint8(zeros(n,1));
% call glReadPixels
moglcore( 'glReadPixels', rect(1), rect(2), width, height, ...
format, type, pixels );
% encode format, type, width, and height at end of matrix
pixels(end-7:end)=[ floor(format/256) mod(format,256) ...
floor(type/256) mod(type,256) ...
floor(width/256) mod(width,256) ...
floor(height/256) mod(height,256) ];
return
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