Add color spaces shader lib

h3d/shader/ColorSpaces.hx

@@ -0,0 +1,47 @@
+package h3d.shader;
+
+class ColorSpaces extends hxsl.Shader {
+    static var SRC = {
+
+        //HSV from https://gist.github.com/983/e170a24ae8eba2cd174f
+		function rgb2hsv(c : Vec3) : Vec3 {
+			var K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
+			var p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));
+			var q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));
+
+			var d = q.x - min(q.w, q.y);
+			var e = 1.0e-8;
+			return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);
+		}
+
+		function hsv2rgb(c : Vec3) : Vec3 {
+			var K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
+			var p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
+			return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
+		}
+
+        //HSL
+        function hsl2rgb( c : Vec3 ) : Vec3 {
+			var rgb = clamp( abs(mod(c.x*6.0+vec3(0.0,4.0,2.0),6.0)-3.0)-1.0, 0.0, 1.0 );
+
+			return c.z + c.y * (rgb-0.5)*(1.0-abs(2.0*c.z-1.0));
+		}
+
+        //YCoCg
+        function rgb2ycocg( rgb : Vec3 ) : Vec3 {
+            var co = rgb.r - rgb.b;
+            var t = rgb.b + co * 0.5;
+            var cg = rgb.g - t;
+            var y = t + cg * 0.5;
+            return vec3(y, co, cg);
+		}
+
+		function ycocg2rgb( ycocg : Vec3 ) : Vec3 {
+			var t = ycocg.r - ycocg.b * 0.5;
+			var g = ycocg.b + t;
+			var b = t - ycocg.g * 0.5;
+			var r = ycocg.g + b;
+			return vec3(r, g, b);
+		}
+    }
+}