Unity循环图片Shader

概述

循环图 Shader

  • 将需要的图拖到Loop贴图上,MainTex用于控制区域大小,本身不显示

效果

效果

代码

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Shader "Custom/Loop" {
Properties {
_Color ("Color", Color) = (1,1,1,1)
_MainTex ("Albedo (RGB)", 2D) = "white" {}
_LoopTex ("Loop", 2D) = "white" {}
_LoopTex_TexelSize ("LoopSize", Vector) = (1,1,1,1)
_offsetX ("ox", Range(-1, 1)) = 0
_offsetY ("oy", Range(-1, 1)) = 0
}
SubShader {
Tags {
"Queue"="Transparent"
"IgnoreProjector"="True"
"RenderType"="Transparent"
"PreviewType"="Plane"
"CanUseSpriteAtlas"="True"
}
Cull Off //关闭背面剔除
Lighting Off //关闭灯光
ZWrite Off //关闭Z缓冲
Blend SrcAlpha OneMinusSrcAlpha //混合源系数
Pass {
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma multi_compile _ PIXELSNAP_ON //告诉Unity编译不同版本的Shader,这里和后面vert中的PIXELSNAP_ON对应
#include "UnityCG.cginc"
// Use shader model 3.0 target, to get nicer looking lighting
#pragma target 3.0
fixed4 _Color;
sampler2D _MainTex;
float4 _MainTex_TexelSize;
sampler2D _LoopTex;
float4 _LoopTex_TexelSize;
float _offsetX;
float _offsetY;
struct appdata_t //vert输入
{
float4 vertex : POSITION;
float4 color : COLOR;
float2 texcoord : TEXCOORD0;
};
struct v2f //vert输出数据结构
{
float4 vertex : SV_POSITION;
fixed4 color : COLOR;
float2 texcoord : TEXCOORD0;
};
// vert shader
v2f vert(appdata_t IN)
{
v2f OUT;
OUT.vertex = UnityObjectToClipPos(IN.vertex);
OUT.texcoord = IN.texcoord;
OUT.color = IN.color;
#ifdef PIXELSNAP_ON
OUT.vertex = UnityPixelSnap (OUT.vertex);
#endif
return OUT;
}
// frag shader
fixed4 frag(v2f IN) : SV_Target
{
fixed4 c = tex2D(_LoopTex, float2(
(floor(IN.texcoord.x * _MainTex_TexelSize.z + _MainTex_TexelSize.z * _offsetX + _MainTex_TexelSize.z) % _LoopTex_TexelSize.z) / _LoopTex_TexelSize.z,
(floor(IN.texcoord.y * _MainTex_TexelSize.w + _MainTex_TexelSize.w * _offsetY + _MainTex_TexelSize.w) % _LoopTex_TexelSize.w) / _LoopTex_TexelSize.w));
// c.a = 1 - (0.299 * c.r + 0.587 * c.g + 0.114 * c.b); // 亮度转不透明度
return c * _Color;
}
ENDCG
}
}
}