glGetVertexAttribfv Interface to
OpenGL function glGetVertexAttribfv
usage: params = glGetVertexAttribfv( index, pname )
C function: void glGetVertexAttribfv(GLuint index, GLenum pname, GLfloat* params)
Psychtoolbox/PsychOpenGL/MOGL/wrap/_glGetVertexAttribfv.m