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@Kink3d
Created February 18, 2018 11:08
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An alpha clip version on Unity's default UI shader with a dithered variant
// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)
Shader "UI/DitheredClip"
{
Properties
{
[PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}
_Color ("Tint", Color) = (1,1,1,1)
_StencilComp ("Stencil Comparison", Float) = 8
_Stencil ("Stencil ID", Float) = 0
_StencilOp ("Stencil Operation", Float) = 0
_StencilWriteMask ("Stencil Write Mask", Float) = 255
_StencilReadMask ("Stencil Read Mask", Float) = 255
_ColorMask ("Color Mask", Float) = 15
_ClipThreshold ("Clip Threshold", Range(0, 1)) = 0.1
[Toggle(UNITY_DITHERING)] _UseDithering ("Use Dithering", Float) = 0
}
SubShader
{
Tags
{
"Queue"="Geometry"
"IgnoreProjector"="True"
"RenderType"="Opaque"
"PreviewType"="Plane"
"CanUseSpriteAtlas"="True"
}
Stencil
{
Ref [_Stencil]
Comp [_StencilComp]
Pass [_StencilOp]
ReadMask [_StencilReadMask]
WriteMask [_StencilWriteMask]
}
Cull Off
Lighting Off
ZWrite On
ZTest [unity_GUIZTestMode]
ColorMask [_ColorMask]
Pass
{
Name "Default"
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma target 2.0
#include "UnityCG.cginc"
#include "UnityUI.cginc"
#pragma multi_compile __ UNITY_UI_CLIP_RECT
#pragma multi_compile __ UNITY_DITHERING
struct appdata_t
{
float4 vertex : POSITION;
float4 color : COLOR;
float2 texcoord : TEXCOORD0;
UNITY_VERTEX_INPUT_INSTANCE_ID
};
struct v2f
{
float4 vertex : SV_POSITION;
fixed4 color : COLOR;
float2 texcoord : TEXCOORD0;
float4 worldPosition : TEXCOORD1;
UNITY_VERTEX_OUTPUT_STEREO
#ifdef UNITY_DITHERING
float4 screenPosition : TEXCOORD2;
#endif
};
fixed4 _Color;
fixed4 _TextureSampleAdd;
float4 _ClipRect;
float _ClipThreshold;
v2f vert(appdata_t v)
{
v2f OUT;
UNITY_SETUP_INSTANCE_ID(v);
UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
OUT.worldPosition = v.vertex;
OUT.vertex = UnityObjectToClipPos(OUT.worldPosition);
OUT.texcoord = v.texcoord;
OUT.color = v.color * _Color;
#ifdef UNITY_DITHERING
OUT.screenPosition = ComputeScreenPos(OUT.vertex);
#endif
return OUT;
}
sampler2D _MainTex;
fixed4 frag(v2f IN) : SV_Target
{
half4 color = (tex2D(_MainTex, IN.texcoord) + _TextureSampleAdd) * IN.color;
#ifdef UNITY_UI_CLIP_RECT
color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);
#endif
#ifdef UNITY_DITHERING
float2 uv = (IN.screenPosition.xy / IN.screenPosition.w) * _ScreenParams.xy;
float DITHER_THRESHOLDS[16] =
{
1.0 / 17.0, 9.0 / 17.0, 3.0 / 17.0, 11.0 / 17.0,
13.0 / 17.0, 5.0 / 17.0, 15.0 / 17.0, 7.0 / 17.0,
4.0 / 17.0, 12.0 / 17.0, 2.0 / 17.0, 10.0 / 17.0,
16.0 / 17.0, 8.0 / 17.0, 14.0 / 17.0, 6.0 / 17.0
};
uint index = (uint(uv.x) % 4) * 4 + uint(uv.y) % 4;
color.a = color.a - (color.a * -1 * DITHER_THRESHOLDS[index]);
#endif
clip (color.a - _ClipThreshold);
return color;
}
ENDCG
}
}
}
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