26 lines
794 B
Java
26 lines
794 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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void main() {
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vec2 tex_mod = mod(gl_FragCoord, 2).xy;
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bool bLeft = (tex_mod.x > 0.0) && (tex_mod.x < 1.0);
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bool bTop = (tex_mod.y > 0.0) && (tex_mod.y < 1.0);
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// horrors - where is the XOR operator ?
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if ((bTop && bLeft) || (!bTop && !bLeft))
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gl_FragColor = vec4(255,255,255,0);
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else
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gl_FragColor = vec4(0,0,0,0);
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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