void glResetMinmax( GLenum target )
Must be GL_MINMAX.
glResetMinmax resets the elements of the current minmax table to their initial values: the “maximum” element receives the minimum possible component values, and the “minimum” element receives the maximum possible component values.
glResetMinmax is present only if GL_ARB_imaging is returned when glGetString is called with an argument of GL_EXTENSIONS.
GL_INVALID_ENUM is generated if target is not GL_MINMAX.
GL_INVALID_OPERATION is generated if glResetMinmax is executed between the execution of glBegin and the corresponding execution of glEnd.