init

Assets/Materials/Portal/portal_include.cginc

@@ -0,0 +1,30 @@
+float3 hueShift(float3 color, float hueAdjust) {
+
+	const float3  kRGBToYPrime = float3(0.299, 0.587, 0.114);
+	const float3  kRGBToI = float3(0.596, -0.275, -0.321);
+	const float3  kRGBToQ = float3(0.212, -0.523, 0.311);
+
+	const float3  kYIQToR = float3(1.0, 0.956, 0.621);
+	const float3  kYIQToG = float3(1.0, -0.272, -0.647);
+	const float3  kYIQToB = float3(1.0, -1.107, 1.704);
+
+	float   YPrime = dot(color, kRGBToYPrime);
+	float   I = dot(color, kRGBToI);
+	float   Q = dot(color, kRGBToQ);
+	float   hue = atan2(Q, I);
+	float   chroma = sqrt(I * I + Q * Q);
+
+	hue += hueAdjust;
+
+	Q = chroma * sin(hue);
+	I = chroma * cos(hue);
+
+	float3    yIQ = float3(YPrime, I, Q);
+
+	return float3(dot(yIQ, kYIQToR), dot(yIQ, kYIQToG), dot(yIQ, kYIQToB));
+
+}
+
+float2 uvRot(float2 uv, float angle) {
+	return mul(float2x2(cos(angle), -sin(angle), sin(angle), cos(angle)), uv);
+}