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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;*/
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: */