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| Shader "Unlit/BtnClickWaveShader"
{
Properties
{
_MainTex ("Texture", 2D) = "white" {}
_ColorLeft ("ColorLeft", Color) = (0,1,0,1)
_ColorRight ("ColorRight", Color) = (0,0,1,1)
_Radius ("Radius", Float) = 1
_RadiusThickness ("RadiusThickness", Float) = 1
_WaveAlpha ("WaveAlpha", Range(0, 1)) = 0.5
[HDR] _WaveColor ("WaveColor", Color) = (1,1,1,1)
[hideInInspector] _CircleScaleOffset ("CircleScaleOffset", Float) = 1 // Width / Height
[hideInInspector] _MouseUVPos ("MouseUVPos", Vector) = (0,0,0,0)
}
SubShader
{
Tags { "RenderType"="Transparent" "Queue"="Transparent"}
Blend SrcAlpha OneMinusSrcAlpha
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
struct appdata
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
};
struct v2f
{
float2 uv : TEXCOORD0;
float4 vertex : SV_POSITION;
};
sampler2D _MainTex;
float4 _MainTex_ST;
float4 _ColorLeft;
float4 _ColorRight;
v2f vert (appdata v)
{
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
o.uv = TRANSFORM_TEX(v.uv, _MainTex);
return o;
}
fixed4 frag (v2f i) : SV_Target
{
fixed4 shape = tex2D(_MainTex, i.uv);
fixed4 col = fixed4(lerp(_ColorLeft, _ColorRight, i.uv.x).rgb, shape.a);
return col;
}
ENDCG
}
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
struct appdata
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
};
struct v2f
{
float2 uv : TEXCOORD0;
float4 vertex : SV_POSITION;
};
sampler2D _MainTex;
float4 _MainTex_ST;
float4 _ColorLeft;
float4 _ColorRight;
float _Radius;
float _RadiusThickness;
float _CircleScaleOffset;
float _WaveAlpha;
float4 _WaveColor;
float4 _MouseUVPos;
fixed4 PixelColor(float2 uv)
{
// 将uv原点移到中心
uv -= _MouseUVPos.xy;
uv = uv * 2 - 1;
// 离uv坐标原点的距离，排除屏幕长宽比、图片长宽比的影响
float2 dv = float2(uv.x, uv.y)* float2(_ScreenParams.x / _ScreenParams.y * _CircleScaleOffset, 1);
float d = sqrt(pow(dv.x, 2) + pow(dv.y, 2));
// 用小圆减大圆 得到圆环
fixed3 c = smoothstep(_Radius-_RadiusThickness, _Radius, d) - smoothstep(_Radius, _Radius+_RadiusThickness, d);
return fixed4(c * _WaveColor.rgb, saturate(c.g)); // -0.5
}
v2f vert (appdata v)
{
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
o.uv = TRANSFORM_TEX(v.uv, _MainTex);
return o;
}
fixed4 frag (v2f i) : SV_Target
{
fixed4 shape = tex2D(_MainTex, i.uv);
fixed4 wave = PixelColor(i.uv);
wave.rgb *= _WaveColor.rgb;
wave.a *= shape.a * _WaveAlpha;
return wave;
}
ENDCG
}
}
}
|
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