glUniformMatrix3fv Interface to
OpenGL function glUniformMatrix3fv
usage: glUniformMatrix3fv( location, count, transpose, value )
C function: void glUniformMatrix3fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat* value)
Psychtoolbox/PsychOpenGL/MOGL/wrap/glUniformMatrix3fv.m