34 lines
1010 B
Plaintext
34 lines
1010 B
Plaintext
//Shader is CC0 from https://godotshaders.com/shader/moving-rainbow-gradient/
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// by Exuin
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// HSV to RBG from https://www.rapidtables.com/convert/color/hsv-to-rgb.html
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// Rotation matrix from https://en.wikipedia.org/wiki/Rotation_matrix
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shader_type canvas_item;
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uniform float strength: hint_range(0., 1.) = 0.5;
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uniform float speed: hint_range(0., 10.) = 0.5;
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uniform float angle: hint_range(0., 360.) = 0.;
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void fragment() {
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float hue = UV.x * cos(radians(angle)) - UV.y * sin(radians(angle));
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hue = fract(hue + fract(TIME * speed));
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float x = 1. - abs(mod(hue / (1./ 6.), 2.) - 1.);
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vec3 rainbow;
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if(hue < 1./6.){
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rainbow = vec3(1., x, 0.);
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} else if (hue < 1./3.) {
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rainbow = vec3(x, 1., 0);
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} else if (hue < 0.5) {
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rainbow = vec3(0, 1., x);
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} else if (hue < 2./3.) {
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rainbow = vec3(0., x, 1.);
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} else if (hue < 5./6.) {
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rainbow = vec3(x, 0., 1.);
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} else {
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rainbow = vec3(1., 0., x);
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}
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vec4 color = texture(TEXTURE, UV);
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COLOR = mix(color, vec4(rainbow, color.a), strength);
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} |