/
ScrollingFill.shader
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ScrollingFill.shader
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// animated scrolling texture with fill amount
// https://unitycoder.com/blog/2020/03/13/shader-scrolling-texture-with-fill-amount/
Shader "UnityLibrary/Patterns/ScrollingFill"
{
Properties
{
_MainTex ("Texture", 2D) = "white" {}
_Fill("Fill", Range(0.0,1.0)) = 0.5
_Speed("Speed", float) = 5
}
SubShader
{
Tags { "RenderType"="Opaque" }
LOD 100
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
struct appdata
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
};
struct v2f
{
float2 uv : TEXCOORD0;
float4 vertex : SV_POSITION;
};
sampler2D _MainTex;
float4 _MainTex_ST;
float _Fill;
float _Speed;
v2f vert (appdata v)
{
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
o.uv = TRANSFORM_TEX(v.uv, _MainTex);
return o;
}
fixed4 frag(v2f i) : SV_Target
{
// get scroll value
float2 scroll = float2(0, frac(_Time.x*_Speed));
// sample texture
fixed4 col = tex2D(_MainTex, i.uv -scroll);
// discard if uv.y is below below cut value
clip(step(i.uv.y, _Fill * _MainTex_ST.y)-0.1);
return col;
// make un-animated part black
//return col*step(i.uv.y, _Cut * _MainTex_ST.y);
}
ENDCG
}
}
}