/* AA shader v2.o
   
   Copyright (C) 2006 guest(r) - guest.r@gmail.com

   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.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/


uniform sampler2D OGL2Texture;

void main()
{
    vec3 c00 = texture2D(OGL2Texture, gl_TexCoord[5].xy).xyz; 
    vec3 c10 = texture2D(OGL2Texture, gl_TexCoord[1].xy).xyz; 
    vec3 c20 = texture2D(OGL2Texture, gl_TexCoord[2].zw).xyz; 
    vec3 c01 = texture2D(OGL2Texture, gl_TexCoord[3].xy).xyz; 
    vec3 c11 = texture2D(OGL2Texture, gl_TexCoord[0].xy).xyz; 
    vec3 c21 = texture2D(OGL2Texture, gl_TexCoord[4].xy).xyz; 
    vec3 c02 = texture2D(OGL2Texture, gl_TexCoord[1].zw).xyz; 
    vec3 c12 = texture2D(OGL2Texture, gl_TexCoord[2].xy).xyz; 
    vec3 c22 = texture2D(OGL2Texture, gl_TexCoord[6].xy).xyz; 
    vec3 dt = vec3(1.0,1.0,1.0); 

    float d1=dot(abs(c00-c22),dt)+0.0001;
    float d2=dot(abs(c20-c02),dt)+0.0001;
    float hl=dot(abs(c01-c21),dt)+0.0001;
    float vl=dot(abs(c10-c12),dt)+0.0001;

    float md = d1+d2;   float mc = hl+vl;
    hl*=  md;vl*= md;   d1*=  mc;d2*= mc;
    
        float ww = d1+d2+hl+vl;
        
    gl_FragColor.xyz= (hl*(c10+c12)+vl*(c01+c21)+d1*(c20+c02)+d2*(c00+c22)+ww*c11)/(3.0*ww);
}