62 lines
1.3 KiB
GLSL
62 lines
1.3 KiB
GLSL
#version 300 es
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precision highp float;
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uniform float u_time;
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uniform float u_canvasWidth;
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uniform float u_canvasHeight;
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out vec4 fragColor;
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// See https://thebookofshaders.com/10/
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float random (vec2 st) {
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return fract(sin(dot(st.xy, vec2(12.9898,78.233)))* 43758.5453123);
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}
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vec4 boxFade(vec4 inputColor, float boxSize, float period) {
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float canvasSize = max(u_canvasWidth, u_canvasHeight);
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vec2 uv = gl_FragCoord.xy/vec2(canvasSize, canvasSize);
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uv.x = floor(uv.x / boxSize) * boxSize;
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uv.y = floor(uv.y / boxSize) * boxSize;
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float rand = random(uv);
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float mask = mod(u_time / period, 2.4);
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return rand < mask ? inputColor : vec4(0.0, 0.0, 0.0, 1.0);
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}
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vec2 pixellate(vec2 inputVec, float size) {
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return vec2(
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floor(inputVec.x / size) * size,
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floor(inputVec.y / size) * size
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);
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}
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void pixelatedSinWave() {
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vec2 uv = gl_FragCoord.xy/vec2(u_canvasWidth, u_canvasHeight);
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float amount = 1.0/(u_time * 9.0);
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uv = pixellate(uv, amount);
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//vec4 outputColor = vec4(uv.x, 0., uv.y, 1.0);
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float dist = distance(uv, vec2(0.5, 0.5));
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float curve = sin(dist * 60.0);
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vec4 outputColor = vec4(0.5, 0.1, curve, 1.0);
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float size = 0.01;
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float period = 1.0;
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fragColor = boxFade(outputColor, size, period);
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}
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void main() {
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pixelatedSinWave();
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}
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