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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2008 by Sun Microsystems, Inc.
*
* OpenOffice.org - a multi-platform office productivity suite
*
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* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
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* version 3 along with OpenOffice.org. If not, see
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************************************************************************/
#version 120
uniform sampler2D leavingSlideTexture;
uniform sampler2D enteringSlideTexture;
uniform sampler2D permTexture;
uniform float time;
varying vec2 v_texturePosition;
float snoise(vec2 P) {
return texture2D(permTexture, P).r;
}
#define PART 0.5
#define START 0.4
#define END 0.9
void main() {
float sn = snoise(10.0*v_texturePosition+time*0.07);
if( time < PART ) {
float sn1 = snoise(vec2(time*15.0, 20.0*v_texturePosition.y));
float sn2 = snoise(v_texturePosition);
if (sn1 > 1.0 - time*time && sn2 < 2.0*time+0.1)
gl_FragColor = vec4(sn, sn, sn, 1.0);
else if (time > START )
gl_FragColor = ((time-START)/(PART - START))*vec4(sn, sn, sn, 1.0) + (1.0 - (time - START)/(PART - START))*texture2D(leavingSlideTexture, v_texturePosition);
else
gl_FragColor = texture2D(leavingSlideTexture, v_texturePosition);
} else if ( time > END ) {
gl_FragColor = ((1.0 - time)/(1.0 - END))*vec4(sn, sn, sn, 1.0) + ((time - END)/(1.0 - END))*texture2D(enteringSlideTexture, v_texturePosition);
} else
gl_FragColor = vec4(sn, sn, sn, 1.0);
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */