47 lines
1.6 KiB
GLSL
47 lines
1.6 KiB
GLSL
/* This animation is the material of my first youtube tutorial about creative
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coding, which is a video in which I try to introduce programmers to GLSL
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and to the wonderful world of shaders, while also trying to share my recent
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passion for this community.
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Video URL: https://youtu.be/f4s1h2YETNY
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*/
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const float timeMultiplier = 0.1f;
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#define BLACK_BLEND_THRESHOLD .4 // This is controls the dim of the screen
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//https://iquilezles.org/articles/palettes/
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vec3 palette(float t) {
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vec3 a = vec3(0.5, 0.5, 0.5);
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vec3 b = vec3(0.5, 0.5, 0.5);
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vec3 c = vec3(1.0, 1.0, 1.0);
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vec3 d = vec3(0.263, 0.416, 0.557);
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return a + b * cos(6.28318 * (c * t + d));
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}
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//https://www.shadertoy.com/view/mtyGWy
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void mainImage(out vec4 fragColor, in vec2 fragCoord) {
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vec2 uv = (fragCoord * 2.0 - iResolution.xy) / iResolution.y;
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vec2 uv0 = uv;
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vec3 finalColor = vec3(0.0);
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for (float i = 0.0; i < 4.0; i++) {
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uv = fract(uv * 1.5) - 0.5;
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float d = length(uv) * exp(-length(uv0));
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vec3 col = palette(length(uv0) + i * .4 + iTime * timeMultiplier * .4);
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d = sin(d * 8. + iTime * timeMultiplier) / 8.;
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d = abs(d);
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d = pow(0.01 / d, 1.2);
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finalColor += col * d;
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}
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vec2 termUV = fragCoord.xy / iResolution.xy;
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vec4 terminalColor = texture(iChannel0, termUV);
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float alpha = step(length(terminalColor.rgb), BLACK_BLEND_THRESHOLD);
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vec3 blendedColor = mix(terminalColor.rgb * 1.0, finalColor.rgb * 0.3, alpha);
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fragColor = vec4(blendedColor, terminalColor.a);
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}
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