colormaps.glsl

/// a collection of cool colormaps in glsl
/// most work on [0, 1].
///
/// Lovingly ripped off from:
///  * halcy


/////////////////////////////////////////////////////////////////
// WAHas Spectrum analyzer palette
// ripped off from https://www.shadertoy.com/view/MstSzj
vec3 wahas_palette(float i){
	if(i<4.0){
		if(i<2.0){
			if(i<1.0) return vec3(0.0,0.0,0.0);
			else return vec3(1.0,3.0,31.0);
		}
        else {
			if(i<3.0) return vec3(1.0,3.0,53.0);
			else return vec3(28.0,2.0,78.0);
		}
	} 
    else if(i<8.0) {
		if(i<6.0) {
			if(i<5.0) return vec3(80.0,2.0,110.0);
			else return vec3(143.0,3.0,133.0);
		}
		else {
			if(i<7.0) return vec3(181.0,3.0,103.0);
			else return vec3(229.0,3.0,46.0);
		}
	}
	else {
		if(i<10.0) {
			if(i<9.0) return vec3(252.0,73.0,31.0);
			else return vec3(253.0,173.0,81.0);
		}
		else if(i<12.0) {
			if(i<11.0) return vec3(254.0,244.0,139.0);
			else return vec3(239.0,254.0,203.0);
		}
		else {
			return vec3(242.0,255.0,236.0);
		}
	}
}

/////////////////////////////////////////////////////////////////
// codapalette
// ripped off from https://www.shadertoy.com/view/4dsyWs
vec3 palette(float i) {
	if(i<4.0) {
		if(i<2.0) {
			if(i<1.0) return vec3(0.0,0.0,0.0);
			else return vec3(1.0,3.0,31.0);
		}
		else {
			if(i<3.0) return vec3(1.0,3.0,53.0);
			else return vec3(28.0,2.0,78.0);
		}
	}
	else if(i<8.0) {
		if(i<6.0) {
			if(i<5.0) return vec3(80.0,2.0,110.0);
			else return vec3(143.0,3.0,133.0);
		}
		else {
			if(i<7.0) return vec3(181.0,3.0,103.0);
			else return vec3(229.0,3.0,46.0);
		}
	}
	else {
		if(i<10.0) {
			if(i<9.0) return vec3(252.0,73.0,31.0);
			else return vec3(253.0,173.0,81.0);
		}
		else if(i<12.0) {
			if(i<11.0) return vec3(254.0,244.0,139.0);
			else return vec3(239.0,254.0,203.0);
		}
		else {
			return vec3(242.0,255.0,236.0);
		}
	}
}