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| Shader "Unlit/SDFIcon"
{
Properties
{
_MainTex ("Texture", 2D) = "white" {} // icon图标
[hideInInspector] _EdgeTex ("EdgeTexture", 2D) = "white" {} // 边缘sdf图形
[HDR] _ColorEdge ("ColorEdge", Color) = (1,1,1,1)
[HDR] _ColorMain ("ColorMain", Color) = (1,1,1,1)
_WidthOuter ("WidthOuter", Range(0.01, 0.08)) = 0.01
_WidthInner ("WidthInner", Range(0.01, 0.08)) = 0.04
_RadiusOuter ("RadiusOuter", Float) = 0.4
_RadiusInner ("RadiusInner", Float) = 0.3
_Step ("Step", Range(.95, 1.3)) = 1.3
_MainTexScale ("MainTexScale", Range(4, 8)) = 6
_uvScale ("_UVScale", Range(0.31, 1.12)) = 0.6
}
SubShader
{
Tags { "RenderType"="Transparent" "Queue"="Transparent"}
Blend SrcAlpha OneMinusSrcAlpha
Pass
{
CGPROGRAM
struct appdata
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
};
struct v2f
{
float4 vertex : SV_POSITION;
float2 uv : TEXCOORD0;
float2 uvEdge : TEXCOORD1;
};
sampler2D _MainTex;
sampler2D _EdgeTex;
float4 _MainTex_ST;
float4 _EdgeTex_ST;
float4 _ColorEdge;
float4 _ColorMain;
float _WidthOuter;
float _WidthInner;
float _Step;
float _RadiusOuter;
float _RadiusInner;
float _MainTexScale;
float _uvScale;
v2f vert (appdata v)
{
v2f o;
// 总体uv中心缩放
float2 centerUV1 = float2(0.5, 0.5);
float2 uvOffset1 = v.uv - centerUV1;
v.uv = centerUV1 + uvOffset1 * _uvScale;
o.vertex = UnityObjectToClipPos(v.vertex);
// icon图标 uv中心缩放
float2 centerUV = float2(0.5, 0.5);
float2 uvOffset = v.uv - centerUV;
o.uv = centerUV + uvOffset * _MainTexScale;
// 全象限
v.uv = v.uv * 2 - 1;
o.uvEdge = TRANSFORM_TEX(v.uv, _EdgeTex);
return o;
}
// 矩形sdf
float sdRect(float2 p, float2 b)
{
float2 d = abs(p) - b;
return min(max(d.x, d.y), 0.0) + length(max(d, 0.0));
}
// 菱形sdf
float ndot(float2 a, float2 b)
{
return a.x * b.x - a.y * b.y;
}
float sdRhombus(float2 p, in float2 b)
{
p = abs(p);
float h = clamp(ndot(b - 2.0 * p, b) / dot(b, b), -1.0, 1.0);
float d = length(p- 0.5 * b * float2(1.0 - _ScreenParams.y, 1.0 + _ScreenParams.y));
return d * sign(p.x * b.y + p.y * b.x - b.x * b.y);
}
fixed4 frag (v2f i) : SV_Target
{
fixed4 c = fixed4(0, 0, 0, 0);
float w = _ScreenParams.x, h = _ScreenParams.y;
float step = 1.0 / w;
// 定义函数
float rect = smoothstep(step, -step, sdRect(i.uvEdge * _Step, float2(_RadiusInner, _RadiusInner))) - smoothstep(step, -step, sdRect(i.uvEdge * _Step, float2(_RadiusInner - _WidthInner, _RadiusInner - _WidthInner)));
float rect2 = smoothstep(step, -step, sdRect(i.uvEdge * _Step, float2(_RadiusOuter, _RadiusOuter))) - smoothstep(step, -step, sdRect(i.uvEdge * _Step, float2(_RadiusOuter - _WidthOuter, _RadiusOuter - _WidthOuter)));
float rhombus = smoothstep(step, -step, sdRhombus(i.uvEdge * (2 - _Step), float2(0.4, 0.4)));
float final = rect + rect2;
// 绘制
// Edge
c = lerp(c, 1, final);
c.a = c.r * (1 - rhombus.r);
c *= _ColorEdge;
// MainTex
fixed4 cm = tex2D(_MainTex, i.uv) * _ColorMain;
cm.a *= sign(rhombus.r);
return cm + c;
}
ENDCG
}
}
}
|
