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- /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
- /*
- * This file is part of the LibreOffice project.
- *
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/.
- */
- #version 130
- /*precision mediump float;*/
- void main() {
- vec2 tex_mod = mod(gl_FragCoord, 2).xy;
- bool bLeft = (tex_mod.x > 0.0) && (tex_mod.x < 1.0);
- bool bTop = (tex_mod.y > 0.0) && (tex_mod.y < 1.0);
- // horrors - where is the XOR operator ?
- if ((bTop && bLeft) || (!bTop && !bLeft))
- gl_FragColor = vec4(255,255,255,0);
- else
- gl_FragColor = vec4(0,0,0,0);
- }
- /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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