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 "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"
}