1 files changed, 21 insertions, 0 deletions
diff --git a/src/main/resources/shaders/modules/utils.glsl b/src/main/resources/shaders/modules/utils.glsl
index 3520df1..10e3a48 100644
--- a/src/main/resources/shaders/modules/utils.glsl
+++ b/src/main/resources/shaders/modules/utils.glsl
@@ -7,9 +7,30 @@ float ssubtract(float a, float b, float k) {
   return -smin(-a, b, k);
 }
 
+// Easing
+float ease_in_out_quart(in float x) {
+  return x < 0.5 ? 8 * x * x * x * x : 1 - pow(-2 * x + 2, 4) / 2;
+}
+vec2 ease_in_out_quart(in vec2 v) {
+  return vec2(ease_in_out_quart(v.x), ease_in_out_quart(v.y));
+}
+
+// Color utils
 vec3 srgb(float r, float g, float b) {
   return vec3(pow(r, 2.2), pow(g, 2.2), pow(b, 2.2));
 }
 vec3 srgb(vec3 c) {
   return srgb(c.r, c.g, c.b);
 }
+vec3 srgb(float c) {
+  return srgb(c, c, c);
+}
+
+vec3 saturation(vec3 color, float s) {
+  float y = 0.2126 * color.r + 0.7152 * color.g + 0.0722 * color.b;
+  return vec3(
+    y + s * (color.r - y),
+    y + s * (color.g - y),
+    y + s * (color.b - y)
+  );
+}