glVertexAttrib4s Interface to
OpenGL function glVertexAttrib4s
usage: glVertexAttrib4s( index, x, y, z, w )
C function: void glVertexAttrib4s(GLuint index, GLshort x, GLshort y, GLshort z, GLshort w)
Psychtoolbox/PsychOpenGL/MOGL/wrap/glVertexAttrib4s.m