switch color palette

hue.shader

shader_type canvas_item;

uniform float precision;
uniform float hue; 

const mat3 rgb2yiq = mat3(vec3(0.299, 0.587, 0.114), vec3(0.595716, -0.274453, -0.321263), vec3(0.211456, -0.522591, 0.311135)); 
const mat3 yiq2rgb = mat3(vec3(1.0, 0.9563, 0.6210), vec3(1.0, -0.2721, -0.6474), vec3(1.0, -1.1070, 1.7046)); 

void fragment() {
	vec3 yColor = rgb2yiq * texture(SCREEN_TEXTURE, SCREEN_UV).rgb;
	float originalHue = atan(yColor.b, yColor.g);
	float finalHue = originalHue + hue;
	float chroma = sqrt(yColor.b * yColor.b+yColor.g * yColor.g);
	vec3 yFinalColor = vec3(yColor.r, chroma * cos(finalHue), chroma * sin(finalHue));
	
	COLOR = vec4(yiq2rgb * yFinalColor, 1.0);
}