/* -*- 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;*/ varying vec2 tex_coord; varying vec2 mask_coord; uniform sampler2D texture; /* white background */ uniform sampler2D mask; /* black background */ void main() { float alpha; vec4 texel0, texel1; texel0 = texture2D(texture, tex_coord); texel1 = texture2D(mask, mask_coord); alpha = 1.0 - abs(texel0.r - texel1.r); if(alpha > 0.0) gl_FragColor = texel1 / alpha; gl_FragColor.a = alpha; } /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
