diff options
Diffstat (limited to 'slideshow/opengl')
| -rw-r--r-- | slideshow/opengl/rippleFragmentShader.glsl | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/slideshow/opengl/rippleFragmentShader.glsl b/slideshow/opengl/rippleFragmentShader.glsl new file mode 100644 index 000000000000..83677e4d6390 --- /dev/null +++ b/slideshow/opengl/rippleFragmentShader.glsl @@ -0,0 +1,33 @@ +/* -*- 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/. + */ + +#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: */ |