glReadPixels

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glReadPixels Interface to OpenGL function glReadPixels

usage:
For standard readback into a Matlab or Octave image matrix:
retpixels = glReadPixels( x, y, width, height, format, type )

For readback into the currently bound OpenGL Pixelbuffer object (PBO):
glReadPixels( x, y, width, height, format, type, bufferoffset )
where bufferoffset is the positive integer byte-offset into the PBO.

C function: void glReadPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, GLvoid* retpixels)