pixi.js/lib/filters/blend-modes/hls/GLhls.js

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'use strict';

"use strict";
const hslgl = `
	float getLuminosity(vec3 c) {
		return 0.3 * c.r + 0.59 * c.g + 0.11 * c.b;
	}

	vec3 setLuminosity(vec3 c, float lum) {
		float modLum = lum - getLuminosity(c);
		vec3 color = c.rgb + vec3(modLum);

		// clip back into legal range
		modLum = getLuminosity(color);
		vec3 modLumVec = vec3(modLum);

		float cMin = min(color.r, min(color.g, color.b));
		float cMax = max(color.r, max(color.g, color.b));

		if(cMin < 0.0) {
			color = mix(modLumVec, color, modLum / (modLum - cMin));
		}

		if(cMax > 1.0) {
			color = mix(modLumVec, color, (1.0 - modLum) / (cMax - modLum));
		}

		return color;
	}

	float getSaturation(vec3 c) {
		return max(c.r, max(c.g, c.b)) - min(c.r, min(c.g, c.b));
	}

	vec3 setSaturationMinMidMax(vec3 cSorted, float s) {
		vec3 colorSorted = cSorted;

		if(colorSorted.z > colorSorted.x) {
			colorSorted.y = (((colorSorted.y - colorSorted.x) * s) / (colorSorted.z - colorSorted.x));
			colorSorted.z = s;
		}
		else {
			colorSorted.y = 0.0;
			colorSorted.z = 0.0;
		}

		colorSorted.x = 0.0;

		return colorSorted;
	}

	vec3 setSaturation(vec3 c, float s) {
		vec3 color = c;

		if(color.r <= color.g && color.r <= color.b) {
			if(color.g <= color.b) {
				color = setSaturationMinMidMax(color.rgb, s).rgb;
			}
			else {
				color = setSaturationMinMidMax(color.rbg, s).rbg;
			}
		}
		else if(color.g <= color.r && color.g <= color.b) {
			if(color.r <= color.b) {
				color = setSaturationMinMidMax(color.grb, s).grb;
			}
			else {
				color = setSaturationMinMidMax(color.gbr, s).gbr;
			}
		}
		else {
			// Using bgr for both fixes part of hue
			if(color.r <= color.g) {
				color = setSaturationMinMidMax(color.brg, s).brg;
			}
			else {
				color = setSaturationMinMidMax(color.bgr, s).bgr;
			}
		}

		return color;
	}
    `;

exports.hslgl = hslgl;
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