Unity Shader 学习笔记(十) 滚动效果Shader实例

Unity Shader 学习笔记(十) 滚动效果Shader实例

Shader代码:

Shader "Custom/Scroll" {
	Properties {
		_MainTint ("Diffuse Tint" , Color) = (1,1,1,1)
		_MainTex ("Base (RGB)", 2D) = "white" {}
		//x轴滚动速度
		_ScrollXSpeed ("X Scroll Speed" , Range(0,10)) = 2
		//y轴滚动速度
		_ScrollYSpeed ("Y Scroll Speed" , Range(0,10)) = 2
	}
	SubShader {
		Tags { "RenderType"="Opaque" }
		LOD 200
		
		CGPROGRAM
		#pragma surface surf Lambert
		fixed4 _MainTint;
		fixed _ScrollXSpeed;
		fixed _ScrollYSpeed;
		sampler2D _MainTex;

		struct Input {
			float2 uv_MainTex;
		};

		void surf (Input IN, inout SurfaceOutput o) {
			
			//获取UV坐标
			fixed2 scrolledUV = IN.uv_MainTex;

			//根据时间和x,y轴的速度 计算当前UV坐标的偏移量
			fixed xScrollValue = _ScrollXSpeed * _Time;
			fixed yScrollValue = _ScrollYSpeed * _Time;
			scrolledUV += fixed2(xScrollValue,yScrollValue);

			half4 c = tex2D (_MainTex, scrolledUV);
			o.Albedo = c.rgb;
			o.Alpha = c.a;
		}
		ENDCG
	} 
	FallBack "Diffuse"
}