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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 150
in vec2 texturePosition;
in float fuzz;
in vec2 v_center;
uniform sampler2D slideTexture;
uniform float selectedTexture;
uniform float time;
uniform float hexagonSize;
bool isBorder(vec2 point)
{
return point.x < 0.02 || point.x > 0.98 || point.y < 0.02 || point.y > 0.98;
}
void main()
{
gl_FragColor = texture2D(slideTexture, texturePosition);
if (hexagonSize > 1.0) {
// The space in-between hexagons.
if (selectedTexture > 0.5)
gl_FragColor.a = 1.0 - time * 8 + gl_FragCoord.x / 1024.;
else
gl_FragColor.a = time * 8 - 7.7 + gl_FragCoord.x / 1024.;
} else {
// The hexagons themselves.
float startTime;
float actualTime;
if (selectedTexture > 0.5) {
// Leaving slide.
if (isBorder(v_center))
// If the center is “outside” of the canvas, clear it first.
startTime = 0.15;
else
startTime = 0.15 + fuzz * 0.4;
float endTime = startTime + 0.05;
actualTime = 1.0 - clamp((time - startTime) / (endTime - startTime), 0, 1);
} else {
// Entering slide.
if (isBorder(v_center))
// If the center is “outside” of the canvas, clear it first.
startTime = 0.85;
else
startTime = 0.3 + fuzz * 0.4;
float endTime = startTime + 0.05;
actualTime = clamp((time - startTime) / (endTime - startTime), 0, 1);
if (time < 0.8)
actualTime *= time / 0.8;
}
gl_FragColor.a = actualTime;
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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