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MarineCompass/source/fresnel.fs

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/*

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 *  fresnel.fs

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 *  MarineCompass

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 *

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 *  Created by döme on 29.07.2009.

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 *  Copyright 2009 __MyCompanyName__. All rights reserved.

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 *

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 */

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precision mediump float;

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uniform sampler2D tex0;

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varying mediump vec3 N;

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varying mediump vec2 tx0;

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varying mediump vec4 epos;

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void main()

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{

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        vec3 NN = normalize(N)*(float(gl_FrontFacing)*2.0 - 1.0);

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        vec3 lightdir = normalize(epos.xyz);

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        lowp vec4 tex0color = texture2D(tex0, tx0);

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        float diffuse = -dot(NN, lightdir);

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        const float n1 = 1.0;

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        const float n2 = 1.4;

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        const float n12 = n1/n2;

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        float cost0 = diffuse;

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        float cost1 = sqrt(1.0 - n12*n12*(1.0 - cost0*cost0));

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        float Rs = (n1*cost0 - n2*cost1)/(n1*cost0 + n2*cost1);

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        float Rp = (n1*cost1 - n2*cost0)/(n1*cost1 + n2*cost0);

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        float R = 0.5*(Rs*Rs+Rp*Rp);

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        gl_FragColor = vec4(tex0color.rgb*(R+0.0*diffuse), R);

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}

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