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function AddToGLOperator(gloperator, opname, shaderhandle, varargin)
% AddToGLOperator(gloperator, opname, shaderhandle [, blittercfg] [, luttexid])
%
% Add additional GLSL image processing shaders to GL operator 'gloperator'.
%
% 'opname' is the name of the to be added shader -- purely for debug
% purpose.
%
% 'shaderhandle' is the GLSL handle of the shader to add.
%
% 'blittercfg' is the optional blitter configuration string with special
% parameters.
%
% 'luttexid' is the optional numeric OpenGL handle of a texture for use as
% lookup-table.
% 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
if nargin < 2 || isempty(opname)
opname = 'GL operator slot without name.';
end
if nargin < 3 || isempty(shaderhandle)
error('You must provide a valid GLSL shader handle ''shaderhandle''!');
end
if nargin >= 4
if length(varargin)>=1
blittercfg = varargin{1};
else
blittercfg = '';
end
if length(varargin)>=2
luttexid = varargin{2};
else
luttexid = 0;
end
else
blittercfg = '';
luttexid = 0;
end
% Count number of slots:
count = CountSlotsInGLOperator(gloperator);
if count > 0
Screen('HookFunction', gloperator, 'AppendBuiltin', 'UserDefinedBlit', 'Builtin:FlipFBOs', '');
end
if count == 1
% Change operator to be dual-pass capable:
Screen('HookFunction', gloperator, 'ImagingMode', mor(kPsychNeedDualPass, Screen('HookFunction', gloperator, 'ImagingMode')));
end
if count > 1
% Change operator to be multi-pass capable:
Screen('HookFunction', gloperator, 'ImagingMode', mor(kPsychNeedMultiPass, Screen('HookFunction', gloperator, 'ImagingMode')));
end
% Add shader to user defined blit chain of the proxy:
Screen('HookFunction', gloperator, 'AppendShader', 'UserDefinedBlit', opname, shaderhandle, blittercfg, luttexid);
% Done.
return;
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