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// Cyrille Henry 2008
#extension GL_ARB_texture_rectangle : enable
uniform sampler2DRect texture;
uniform float K2, K;
vec2 pos_(vec2 V, float x, float y)
{
V += vec2(x,y);
return(max(min(V,vec2(91.,63.)),vec2(0.)));
}
void main (void)
{
vec2 pos = gl_TexCoord[0].st * vec2(90.,62.)/256. ;
vec4 color1 = texture2DRect(texture,pos_(pos,-1.,-1.));
vec4 color2 = texture2DRect(texture,pos_(pos, 0.,-1.));
vec4 color3 = texture2DRect(texture,pos_(pos, 1.,-1.));
vec4 color4 = texture2DRect(texture,pos_(pos,-1., 0.));
vec4 color5 = texture2DRect(texture,pos_(pos, 0., 0.));
vec4 color6 = texture2DRect(texture,pos_(pos, 1., 0.));
vec4 color7 = texture2DRect(texture,pos_(pos,-1., 1.));
vec4 color8 = texture2DRect(texture,pos_(pos, 0., 1.));
vec4 color9 = texture2DRect(texture,pos_(pos, 1., 1.));
vec4 colorBG = color1 + color2 + color4 + color5;
vec4 colorBD = color3 + color2 + color6 + color5;
vec4 colorHG = color4 + color5 + color7 + color8;
vec4 colorHD = color5 + color6 + color8 + color9;
vec2 fract_pos = (fract(pos));
vec4 XB = mix(colorBG,colorBD,fract_pos.x);
vec4 XH = mix(colorHG,colorHD,fract_pos.x);
vec4 X = mix(XB,XH,fract_pos.y) / 4.;
X -= vec4(0.5);
X.xyz = normalize(X.xyz);
if(gl_FrontFacing)
{X *= -1.;}
float tmp = dot(X.xyz,normalize(vec3(0.,1.,1.)));
tmp = -tmp;
tmp = max(0.,tmp) + 0.3 * min(0.,tmp);
tmp = 0.1 + 0.9 * tmp;
vec4 color = tmp * vec4(1,0.95,0.9,1);
color.a = smoothstep(0.75,1.,pos.x);
gl_FragColor = color;
}
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