glGetConvolutionFilter Interface to
OpenGL function glGetConvolutionFilter
usage: image = glGetConvolutionFilter( target, format, type )
C function: void glGetConvolutionFilter(GLenum target, GLenum format, GLenum type, GLvoid* image)
Psychtoolbox/PsychOpenGL/MOGL/wrap/_glGetConvolutionFilter.m