From 178c4a3782aea07e66d39cbcb5cd770c92c3c6cb Mon Sep 17 00:00:00 2001
From: Luca Conte <main@lugico.de>
Date: Thu, 8 May 2025 14:24:14 +0200
Subject: [PATCH] u06-1

---
 src/shaders/fragment.glsl | 30 +++++++++++++++++++++++++++---
 1 file changed, 27 insertions(+), 3 deletions(-)

diff --git a/src/shaders/fragment.glsl b/src/shaders/fragment.glsl
index 2b87f44..e5ac8a7 100644
--- a/src/shaders/fragment.glsl
+++ b/src/shaders/fragment.glsl
@@ -1,4 +1,28 @@
 #version 330 core
+
+float pi = 3.14159;
+vec3 hsvToRgb(vec3 hsl) {
+	while (hsl.x > 1) {
+		hsl.x -= 1;
+	}
+	int hi = int(floor(hsl.x * 6));
+	float f = hsl.x * 6 - hi;
+
+	float p = hsl.z * (1 - hsl.y);
+	float q = hsl.z * (1 - hsl.y * f);
+	float t = hsl.z * (1 - hsl.y * (1 - f));
+
+	switch (hi) {
+		case 0: return vec3(hsl.z, t, p);
+		case 1: return vec3(q, hsl.z, p);
+		case 2: return vec3(p, hsl.z, t);
+		case 3: return vec3(p, q, hsl.z);
+		case 4: return vec3(t, p, hsl.z);
+		case 5: return vec3(hsl.z, p, q);
+		default: return vec3(0);
+	}
+}
+
 in float fragValue;
 flat in int pattern;
 void main() {
@@ -6,15 +30,15 @@ void main() {
 	vec4 fragColor2 = vec4(0.0, 1.0, 0.0, 1.0);
 	switch (pattern) {
 	case 0:
-		gl_FragColor = mix(fragColor1, fragColor2, fragValue);
+		gl_FragColor = vec4(hsvToRgb(vec3(fragValue, 1, 1)), 1);
 		break;
 
 	case 1:
-		gl_FragColor = mix(fragColor1, fragColor2, step(0.5, fragValue));
+		gl_FragColor = vec4(hsvToRgb(vec3(0, fragValue, 1)), 1);
 		break;
 
 	case 2:
-		gl_FragColor = mix(fragColor1, fragColor2, smoothstep(0.4, 0.6, fragValue));
+		gl_FragColor = vec4(hsvToRgb(vec3(0, 1, fragValue)), 1);
 		break;
 
 	case 3: