Text Outline
(the global alpha dicted by material color must pilot the alpha of the outline) |
m (material global alpha must pilot interior outline alpha + replaced outline color transition with appropriate lerp) |
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| Line 157: | Line 157: | ||
{ | { | ||
fixed alpha = GetOutineAlpha( i, output.a, false ); | fixed alpha = GetOutineAlpha( i, output.a, false ); | ||
| − | if( alpha > 0.0f ) return | + | if( alpha > 0.0f ) return lerp( i.color, _OutlineColor, alpha ) * i.color.a; |
} | } | ||
Revision as of 14:00, 15 October 2020
Author: Serge Billault
Contents |
Description
Text outlining with independantly selectable interior and exterior. The pixel being rendered sample its surrounding according to outline _Thickness (in pixels) and deduce the outline alpha from the distance with the nearest outline inducing texture texel.
Preview
Code ( UI_TextOutline.shader )
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Shader "Unlit/UI_TextOutline"
{
Properties
{
_MainTex ( " Texture", 2D ) = "white" {}
/*[PerRendererData]*/ _OutlineColor( " Outline Color", Color ) = ( 0.0, 0.0, 0.0, 1.0 )
/*[PerRendererData]*/ _Thickness ( " Thickness", Range( 1.0, 16.0 ) ) = 2.1
/*[PerRendererData]*/[MaterialToggle] _Exterior ( " Exterior", Float ) = 1.0
/*[PerRendererData]*/[MaterialToggle] _Interior ( " Interior", Float ) = 0.0
}
SubShader
{
Tags
{
"Queue" = "Transparent"
"RenderType" = "Opaque"
}
LOD 100
Blend SrcAlpha OneMinusSrcAlpha
Pass
{
CGPROGRAM
//********************************************************************************************
//
//********************************************************************************************
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
//********************************************************************************************
//
//********************************************************************************************
struct appdata
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
float4 color : COLOR;
};
struct v2f
{
float4 vertex : SV_POSITION;
float2 uv : TEXCOORD0;
float4 color : COLOR;
};
static const fixed alpha_threshold = 0.6f;
//********************************************************************************************
//
//********************************************************************************************
sampler2D _MainTex;
fixed4 _MainTex_TexelSize;
fixed4 _MainTex_ST;
fixed4 _OutlineColor;
fixed _Thickness;
fixed _Exterior;
fixed _Interior;
//********************************************************************************************
//
//********************************************************************************************
fixed GetOutineAlpha( v2f i, fixed a, bool exterior )
{
bool valid_context = exterior ? ( a < alpha_threshold ) : ( a > alpha_threshold );
if ( valid_context )
{
fixed texel_w = _MainTex_TexelSize.x;
fixed texel_h = _MainTex_TexelSize.y;
fixed min_dst = 1.0e38f;
fixed dst;
fixed2 uv;
fixed4 sampling;
for( int x = -_Thickness; x <= _Thickness; ++x )
{
for( int y = -_Thickness; y <= _Thickness; ++y )
{
uv.x = i.uv.x + ( x * texel_w );
uv.y = i.uv.y + ( y * texel_h );
sampling = tex2Dlod( _MainTex, fixed4( uv.x, uv.y, 0, 0 ) );
bool outline = exterior ? ( sampling.a >= alpha_threshold ) : ( sampling.a <= alpha_threshold );
if ( outline )
{
dst = ( x * x ) + ( y * y );
if( min_dst > dst ) min_dst = dst;
}
}
}
if( min_dst < 1.0e38f )
{
fixed dist = sqrt( min_dst );
fixed alpha = 1.0f - ( clamp( ( dist * dist ) / ( _Thickness * _Thickness ), 0.0f, 1.0f ) );
return alpha;
}
}
return -1.0f;
}
//********************************************************************************************
//
//********************************************************************************************
v2f vert( appdata v )
{
v2f o;
o.vertex = UnityObjectToClipPos( v.vertex );
o.uv = TRANSFORM_TEX( v.uv, _MainTex );
o.color = v.color;
return o;
}
//********************************************************************************************
//
//********************************************************************************************
fixed4 frag( v2f i ) : SV_Target
{
fixed4 output = tex2D( _MainTex, i.uv );
if( _Exterior )
{
fixed alpha = GetOutineAlpha( i, output.a, true );
if( alpha > 0.0f ) return fixed4( _OutlineColor.r, _OutlineColor.g, _OutlineColor.b, alpha * i.color.a );
}
if( _Interior )
{
fixed alpha = GetOutineAlpha( i, output.a, false );
if( alpha > 0.0f ) return lerp( i.color, _OutlineColor, alpha ) * i.color.a;
}
return output.a * i.color;
}
ENDCG
}
}
}
License
Well, it's one of my first shaders, so... . Planet free.
