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Shader "Tutorial/041_HSV/HueCycle"{
//show values to edit in inspector
_CycleSpeed ("Hue Cycle Speed", Range(0, 1)) = 0
_MainTex ("Texture", 2D) = "white" {}
//the material is completely non-transparent and is rendered at the same time as the other opaque geometry
Tags{ "RenderType"="Opaque" "Queue"="Geometry"}
//include useful shader functions
#include "UnityCG.cginc"
#include "HSVLibrary.cginc"
//define vertex and fragment shader
#pragma vertex vert
#pragma fragment frag
//Hue cycle speed
float _CycleSpeed;
sampler2D _MainTex;
float4 _MainTex_ST;
//the object data that's put into the vertex shader
struct appdata{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
//the data that's used to generate fragments and can be read by the fragment shader
struct v2f{
float4 position : SV_POSITION;
float2 uv : TEXCOORD0;
//the vertex shader
v2f vert(appdata v){
v2f o;
//convert the vertex positions from object space to clip space so they can be rendered
o.position = UnityObjectToClipPos(v.vertex);
o.uv = v.uv;
return o;
//the fragment shader
fixed4 frag(v2f i) : SV_TARGET{
float3 col = tex2D(_MainTex, i.uv);
float3 hsv = rgb2hsv(col);
hsv.x += i.uv.y + _Time.y * _CycleSpeed;
col = hsv2rgb(hsv);
return float4(col, 1);