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// (c)2011-2012 Cyrille Henry & Marian Weger
// part of EXTENDED VIEW TOOLKIT // gpl v3
#extension GL_ARB_texture_rectangle : enable
uniform sampler2DRect MyTex;
uniform float Sl,Sr,St,Sb; // shade size
uniform float set_alpha; // toggle alpha set to 1
varying vec2 pos;
void main (void)
{
vec4 color = texture2DRect(MyTex, gl_TexCoord[0].st);
if (set_alpha == 1.)
{
color.a = 1.;
}
else {}
color.a *=min(1.,pos.x/Sl);
color.a *=min(1.,(1.-pos.x)/Sr);
color.a *=min(1.,pos.y/St);
color.a *=min(1.,(1.-pos.y)/Sb);
gl_FragColor = color;
}
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