Linear Rainbow

Adds a rainbow tint to a texture along the x-axis, y-axis, or both

Uniforms:
Horizontal/Vertical Influence: How much influence the x/y axis has on the rainbow tint

Shader code
shader_type canvas_item;

// --- Uniforms --- //
uniform float horizontal_influence: hint_range(0.0, 1.0, 0.1) = 0.5;
uniform float vertical_influence: hint_range(0.0, 1.0, 0.1) = 0.0;

// --- Functions --- //
vec3 hsv2rgb(vec3 _c) {
    vec4 _K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
    vec3 _p = abs(fract(_c.xxx + _K.xyz) * 6.0 - _K.www);
    return _c.z * mix(_K.xxx, clamp(_p - _K.xxx, 0.0, 1.0), _c.y);
}

void fragment() {
	COLOR.rgb += horizontal_influence * hsv2rgb(vec3(UV.x, 1.0, 1.0))
			+ vertical_influence * hsv2rgb(vec3(UV.y, 1.0, 1.0));
}
Tags
rainbow, rainbow linear, rgb
The shader code and all code snippets in this post are under CC0 license and can be used freely without the author's permission. Images and videos, and assets depicted in those, do not fall under this license. For more info, see our License terms.

More from KingToot

Shine

Invert Color

Burn/Dissolve

Related shaders

Adjustable Strength (Sharp) Linear Interpolation

Linear Gradient

Moving Rainbow Gradient (GD 4.0)

Subscribe
Notify of
guest

0 Comments
Inline Feedbacks
View all comments