31 lines
863 B
Java
31 lines
863 B
Java
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#version 130
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/*precision mediump float;*/
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varying vec2 tex_coord;
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varying vec2 mask_coord;
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uniform sampler2D texture; /* white background */
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uniform sampler2D mask; /* black background */
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void main()
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{
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float alpha;
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vec4 texel0, texel1;
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texel0 = texture2D(texture, tex_coord);
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texel1 = texture2D(mask, mask_coord);
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alpha = 1.0 - abs(texel0.r - texel1.r);
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if(alpha > 0.0)
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gl_FragColor = texel1 / alpha;
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gl_FragColor.a = alpha;
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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