Unity SpriteRender 支持Tile平铺的Shader
发表于2018-03-06
默认的SpriteRender不支持平铺，因此需要重复平铺地砖的时候，要么就得用一个Quad，要么就得重复的铺多个SpriteRender。
使用Quad的情况下，还需要处理Z轴，比较麻烦，要不就会出现Z-Fighting（个别小米手机上会出现）
而使用平铺很多SpriteRanderer的方法，又会引起效能损耗。于是想通过修改Unity内置的Shader的方式，让SpriteRender支持平铺，下面就给大家介绍这个支持Tile平铺的Shader。
效果如下：
设置如下：
Shader如下：
Shader "Sprite/SupportTiling"
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Properties
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[PerRendererData] _MainTex("Sprite Texture", 2D) = "white" ｛｝
_Color("Tint", Color) = (1, 1, 1, 1)
_RepeatX("RepeatX", float) = 1
_RepeatY("RepeatY", float) = 1
[MaterialToggle] PixelSnap("Pixel snap", Float) = 0
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SubShader
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Tags
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"Queue" = "Transparent"
"IgnoreProjector" = "True"
"RenderType" = "Transparent"
"PreviewType" = "Plane"
"CanUseSpriteAtlas" = "True"
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Cull Off
Lighting Off
ZWrite Off
Blend One OneMinusSrcAlpha
Pass
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CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma target 2.0
#pragma multi_compile _ PIXELSNAP_ON
#pragma multi_compile _ ETC1_EXTERNAL_ALPHA
#include "UnityCG.cginc"
struct appdata_t
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float4 vertex : POSITION;
float4 color : COLOR;
float2 texcoord : TEXCOORD0;
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struct v2f
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float4 vertex : SV_POSITION;
fixed4 color : COLOR;
float2 texcoord : TEXCOORD0;
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fixed4 _Color;
v2f vert(appdata_t IN)
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v2f OUT;
OUT.vertex = UnityObjectToClipPos(IN.vertex);
OUT.texcoord = IN.texcoord;
OUT.color = IN.color * _Color;
#ifdef PIXELSNAP_ON
OUT.vertex = UnityPixelSnap(OUT.vertex);
#endif
return OUT;
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sampler2D _MainTex;
sampler2D _AlphaTex;
fixed _RepeatX;
fixed _RepeatY;
fixed4 SampleSpriteTexture(float2 uv)
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uv.x = (uv.x - (int)(uv.x / (1 / _RepeatX)) * (1 / _RepeatX)) * _RepeatX;
uv.y = (uv.y - (int)(uv.y / (1 / _RepeatY)) * (1 / _RepeatY)) * _RepeatY;
fixed4 color = tex2D(_MainTex, uv);
#if ETC1_EXTERNAL_ALPHA
// get the color from an external texture (usecase: Alpha support for ETC1 on android)
color.a = tex2D(_AlphaTex, uv).r;
#endif //ETC1_EXTERNAL_ALPHA
return color;
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fixed4 frag(v2f IN) : SV_Target
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fixed4 c = SampleSpriteTexture(IN.texcoord) * IN.color;
c.rgb *= c.a;
return c;
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ENDCG
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