Unity Shader编程之一：多颜色条纹背景

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本文链接： https://blog.csdn.net/qq_26999509/article/details/85207092

两种颜色的条纹状背景

Shader "Custom/Flag"
{
	Properties
	{
		[PerRendererData]_MainTex ("Texture", 2D) = "white" {}
		_1stColor("1stColo",Color) = (0,0,0,1)
		_2ndColor("2ndColor",Color) = (1,1,1,1)
		_tileNum("tile num", Range (2, 20)) = 10
	}
	SubShader
	{
		Tags { "RenderType"="Opaque" }
		LOD 100

		Pass
		{
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			// make fog work
			#pragma multi_compile_fog
			
			#include "UnityCG.cginc"

			struct appdata
			{
				float4 vertex : POSITION;
				float2 uv : TEXCOORD0;
			};

			struct v2f
			{
				float2 uv : TEXCOORD0;
				float4 vertex : SV_POSITION;
			};

			sampler2D _MainTex;
			fixed4 _1stColor;
			fixed4 _2ndColor;
			int _tileNum;
			
			v2f vert (appdata v)
			{
				v2f o;
				o.vertex = UnityObjectToClipPos(v.vertex);
				o.uv = v.uv;
				return o;
			}
			
			fixed4 frag (v2f i) : SV_Target
			{
				//i.uv * _tileNum 将uv放大
				//frac函数，取其小数部分
				float2 newuv = frac(i.uv*_tileNum);
				//step函数小于0.5返回0，否则返回1，再lerp一下，也就是uv.x小于0.5，返回_1stColor，否则返回_2ndColor
				fixed4 color = lerp(_1stColor,_2ndColor,step(0.5,newuv.x));
				return color;
			}
			ENDCG
		}
	}
}

效果图：