'''OpenGL extension EXT.point_parameters

This module customises the behaviour of the 
OpenGL.raw.GL.EXT.point_parameters to provide a more 
Python-friendly API

Overview (from the spec)
	
	This extension supports additional geometric characteristics of points. It
	can be used to render particles or tiny light sources, commonly referred
	as "Light points".
	
	The raster brightness of a point is a function of the point area, point
	color, point transparency, and the response of the display's electron gun
	and phosphor. The point area and the point transparency are derived from the
	point size, currently provided with the <size> parameter of glPointSize.
	
	The primary motivation is to allow the size of a point to be affected by
	distance attenuation. When distance attenuation has an effect, the final
	point size decreases as the distance of the point from the eye increases.
	
	The secondary motivation is a mean to control the mapping from the point
	size to the raster point area and point transparency. This is done in order
	to increase the dynamic range of the raster brightness of points. In other
	words, the alpha component of a point may be decreased (and its transparency
	increased) as its area shrinks below a defined threshold.
	
	This extension defines a derived point size to be closely related to point
	brightness. The brightness of a point is given by:
	
	                    1
	    dist_atten(d) = -------------------
	                    a + b * d + c * d^2
	
	    brightness(Pe) = Brightness * dist_atten(|Pe|)
	
	where 'Pe' is the point in eye coordinates, and 'Brightness' is some initial
	value proportional to the square of the size provided with glPointSize. Here
	we simplify the raster brightness to be a function of the rasterized point
	area and point transparency.
	
	                brightness(Pe)                      brightness(Pe) >= Threshold_Area
	    area(Pe) =
	                Threshold_Area                      Otherwise
	
	    factor(Pe) = brightness(Pe)/Threshold_Area
	
	    alpha(Pe) = Alpha * factor(Pe)
	
	where 'Alpha' comes with the point color (possibly modified by lighting).
	
	'Threshold_Area' above is in area units. Thus, it is proportional to the
	square of the threshold provided by the programmer through this extension.
	
	The new point size derivation method applies to all points, while the
	threshold applies to multisample points only.

The official definition of this extension is available here:
http://www.opengl.org/registry/specs/EXT/point_parameters.txt
'''
from OpenGL import platform, constants, constant, arrays
from OpenGL import extensions, wrapper
from OpenGL.GL import glget
import ctypes
from OpenGL.raw.GL.EXT.point_parameters import *
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