[Shader]一个类似暗黑3血条的效果

<1>效果图

<2>源码

Shader "UI/UI2"
{
Properties
{
[PerRendererData] _MainTex("Sprite Texture", 2D) = "white" {}
_Noise("_Noise 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

//My
_Speed("速度",Range(0,1)) = 1
_Fill("高度",Range(0,1))=1
_Conc("浓度",Range(1,5))=1
_Trans("透明度",Range(0,1))=1

[Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip("Use Alpha Clip", Float) = 0
}

SubShader
{
Tags
{
"Queue" = "Transparent"
"IgnoreProjector" = "True"
"RenderType" = "Transparent"
"PreviewType" = "Plane"
"CanUseSpriteAtlas" = "True"
}

Stencil
{
Ref[_Stencil]
Comp[_StencilComp]
Pass[_StencilOp]
ReadMask[_StencilReadMask]
WriteMask[_StencilWriteMask]
}

Cull Off
Lighting Off
ZWrite Off
ZTest[unity_GUIZTestMode]
Blend SrcAlpha OneMinusSrcAlpha
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_ALPHACLIP
#define PI 3.1415926

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
};

fixed4 _Color;
fixed4 _TextureSampleAdd;
float4 _ClipRect;
float _Speed;
float _Fill;
float _Conc;
float _Trans;

v2f vert(appdata_t IN)
{
v2f OUT;
UNITY_SETUP_INSTANCE_ID(IN);
UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
OUT.worldPosition = IN.vertex;
OUT.vertex = UnityObjectToClipPos(OUT.worldPosition);

OUT.texcoord = IN.texcoord;

OUT.color = IN.color * _Color;
return OUT;
}

sampler2D _MainTex;
sampler2D _Noise;
sampler2D _GrabTexture;

fixed4 frag(v2f IN) : SV_Target
{
half2 uv = IN.texcoord;
half4 col = IN.color;
_Conc = (_Conc*-1) + 6;
_Speed = _Speed*0.1;
//采样噪声图
half4 no1 = tex2D(_Noise, uv + _Time.xz*_Speed);
half4 no2 = tex2D(_Noise, uv - _Time.zx*_Speed);
half4 no3 = tex2D(_Noise, uv - _Time.yz*_Speed);

//uv += no1.xy;

col.a -= no1.x*no2.x*no3.x*_Conc;
col.a *= _Trans;

//Fill 波纹
half q = sin((_Time.x + uv.x)%PI);//1 0 1
half t = _Time.x%PI;
//half val = sin(_Time.x % PI);//0-1-0

half val = sin((_Time.x+t- uv.x)*10 % PI);//0 -1 -0

//X高度 0-1-0
//0 0.05 0
val = val*0.05;

col.a = 1-(uv.y+val) > _Fill ? 0: col.a;

//圆周
half dis = length(uv - float2(0.5, 0.5));
col.a = dis > 0.45 ? 1 : col.a;

clip(col.a - 0.01);

half4 color = (tex2D(_MainTex, uv) + _TextureSampleAdd) * col;
color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);

#ifdef UNITY_UI_ALPHACLIP
clip(color.a - 0.001);
#endif

return color;
}
ENDCG
}
}
}