motion blur - fixed function

<?xml version="1.0" encoding="UTF-8"?>
<!--
    Motion Blur
    Authors: hunterk, cgwg

    This program is free software; you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by the Free
    Software Foundation; either version 2 of the License, or (at your option)
    any later version.
    -->
<shader language="GLSL">
   <vertex><![CDATA[

      void main()
      {
         gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
         gl_TexCoord[0].xy = gl_MultiTexCoord0.xy;
      }
   ]]></vertex>
<fragment><![CDATA[
uniform sampler2D rubyTexture;
uniform sampler2D rubyPrev6Texture;
uniform sampler2D rubyPrev5Texture;
uniform sampler2D rubyPrev4Texture;
uniform sampler2D rubyPrev3Texture;
uniform sampler2D rubyPrev2Texture;
uniform sampler2D rubyPrev1Texture;
uniform sampler2D rubyPrevTexture;

void main()
{
vec4 color = texture2D(rubyPrev6Texture, gl_TexCoord[0].xy);
color = (color + texture2D(rubyPrev5Texture, gl_TexCoord[0].xy)) / 2.0;
color = (color + texture2D(rubyPrev4Texture, gl_TexCoord[0].xy)) / 2.0;
color = (color + texture2D(rubyPrev3Texture, gl_TexCoord[0].xy)) / 2.0;
color = (color + texture2D(rubyPrev2Texture, gl_TexCoord[0].xy)) / 2.0;
color = (color + texture2D(rubyPrev1Texture, gl_TexCoord[0].xy)) / 2.0;
color = (color + texture2D(rubyPrevTexture, gl_TexCoord[0].xy)) / 2.0;
color = (color + texture2D(rubyTexture, gl_TexCoord[0].xy)) / 2.0;

gl_FragColor = color;
}
]]></fragment>
</shader>