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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 120
#define M_PI 3.1415926535897932384626433832795
uniform sampler2D leavingSlideTexture;
uniform sampler2D enteringSlideTexture;
uniform float time;
uniform vec2 center;
varying vec2 v_texturePosition;
void main()
{
float d = length(v_texturePosition - center);
float w = 0;
w = max(w, length(center - vec2(0, 0)));
w = max(w, length(center - vec2(1, 0)));
w = max(w, length(center - vec2(1, 1)));
w = max(w, length(center - vec2(0, 1)));
float v = 0.2;
float smoothtime = smoothstep(0, 1, time);
float a = smoothstep(smoothtime*w-v, smoothtime*w+v, d);
a += (0.5 - abs(a-0.5))*sin(d*M_PI*30);
gl_FragColor = mix(texture2D(enteringSlideTexture, v_texturePosition), texture2D(leavingSlideTexture, v_texturePosition), a);
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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