Simon Schneegans
45 lines
2.0 KiB
GLSL
45 lines
2.0 KiB
GLSL
//////////////////////////////////////////////////////////////////////////////////////////
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// ) ( //
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// ( /( ( ( ) ( ( ( ( )\ ) ( ( //
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// )\()) ))\ )( ( ( )\ ) )\))( )\ ( (()/( ( )\))( ( //
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// ((_)\ /((_|()\ )\ ) )\ '(()/( ((_)()((_) )\ ) ((_)))\((_)()\ )\ //
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// | |(_|_))( ((_)_(_/( _((_)) )(_)) _(()((_|_)_(_/( _| |((_)(()((_|(_) //
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// | '_ \ || | '_| ' \)) | ' \()| || | \ V V / | ' \)) _` / _ \ V V (_-< //
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// |_.__/\_,_|_| |_||_| |_|_|_| \_, | \_/\_/|_|_||_|\__,_\___/\_/\_//__/ //
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// |__/ //
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// Copyright (c) 2021 Simon Schneegans //
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// Released under the GPLv3 or later. See LICENSE file for details. //
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//////////////////////////////////////////////////////////////////////////////////////////
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// The content from common.glsl is automatically prepended to each shader effect.
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uniform float uPixelSize;
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uniform float uSpokeCount;
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void main() {
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// We simply inverse the progress for opening windows.
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float progress = smoothstep(0.0, 1.0, uForOpening ? 1.0 - uProgress : uProgress);
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// The current level of pixelation increases with the progress.
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float pixelSize = ceil(uPixelSize * progress + 1.0);
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vec2 pixelGrid = vec2(pixelSize) / uSize;
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vec2 texcoord = iTexCoord.st - mod(iTexCoord.st, pixelGrid) + pixelGrid * 0.5;
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vec4 oColor = getInputColor(texcoord);
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// Now hide the spoke sections.
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vec2 down = vec2(0.0, 1.0);
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vec2 fragDir = normalize(texcoord - 0.5);
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// Compute angle to down direction.
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float angle = 0.5 * acos(dot(down, fragDir)) / 3.14159265359;
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if (fragDir.x < 0.0) {
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angle = 1.0 - angle;
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}
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// Progressively hide the spokes.
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if (mod(angle * uSpokeCount, 1.0) < progress) {
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oColor.a = 0.0;
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}
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setOutputColor(oColor);
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} |