shader案例-LOGO 闪光
shader案例-LOGO 闪光
LOGO 闪光
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//Logo 闪光shader
Shader "Practice/FlashTestMat"
{
Properties
{
_MainTex ("Texture", 2D) = "white" {}
//间隔
_Interval("Interval",float) = 5.0
_BrightNess("BrightNess",float)=10000000
_BrightWidth("BrightWidth",Range(0,0.5))=0.1
}
SubShader
{
// No culling or depth
Cull Off ZWrite Off
// Blend SrcAlpha OneMinusSrcAlpha
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
sampler2D _MainTex;
float4 _MainTex_ST;
float _Interval;
float _BrightNess;
float _BrightWidth;
struct appdata
{
float4 vertex : POSITION;
float4 texcoord : TEXCOORD0;
};
struct v2f
{
float2 uv : TEXCOORD0;
float4 vertex : SV_POSITION;
};
v2f vert (appdata v)
{
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
o.uv = v.texcoord.xy*_MainTex_ST.xy+_MainTex_ST.zw;
return o;
}
//闪光
//可以在这里丰富闪光的形状，其他逻辑等
fixed4 blinn(float2 uv)
{
//当前时间段
fixed delta = fmod(_Time.y,_Interval);
float dis =saturate(_BrightWidth- abs(uv.x+0.5-delta));
float cur_brightness=_BrightNess*dis;
fixed3 rgb = fixed3(1,1,1)*cur_brightness;
return fixed4(rgb,1);
}
fixed4 frag (v2f i) : SV_Target
{
fixed4 col = tex2D(_MainTex, i.uv);
//透明不闪光
clip(col.a-0.1);
fixed4 brighness = blinn(i.uv);
col = col+brighness;
return col;
}
ENDCG
}
}
Fallback "UI/Default"
}
增加调试参数
为了策划方便调试，这里丰富下 shader 的参数，让光柱进行一定的偏移，给定闪光频率。 
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//Logo 闪光shader
Shader "Practice/FlashTestMat"
{
Properties
{
_MainTex ("Texture", 2D) = "white" {}
//冷却
_Cold("Cold",Range(0,3.0)) = 1.0
//完成闪烁时间
_FinishTime("FinishTime",Range(1.0,4.0))=2.0
//光亮度
_BrightNess("BrightNess",float)=100
//光柱宽度
_BrightWidth("BrightWidth",Range(0,0.5))=0.1
//偏移速率
_Rad("Rad",Range(0,3.14))=1.0 //偏移弧度
}
SubShader
{
// No culling or depth
Cull Off ZWrite Off
// Blend SrcAlpha OneMinusSrcAlpha
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
sampler2D _MainTex;
float4 _MainTex_ST;
float _FinishTime;
float _BrightNess;
float _BrightWidth;
float _Rad;
float _Cold;
struct appdata
{
float4 vertex : POSITION;
float4 texcoord : TEXCOORD0;
};
struct v2f
{
float2 uv : TEXCOORD0;
float4 vertex : SV_POSITION;
};
v2f vert (appdata v)
{
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
o.uv = v.texcoord.xy*_MainTex_ST.xy+_MainTex_ST.zw;
return o;
}
//闪光
fixed4 blinn(float2 uv)
{
//当前时间段
fixed delta = _Time.y/(_FinishTime+_Cold);
delta =delta - floor(delta);
delta = delta*(_FinishTime+_Cold)/_FinishTime;
//根据y轴做一定的偏移s
fixed _offset_x=uv.y*tan(_Rad);
float dis =saturate(_BrightWidth- abs(uv.x+0.5+_offset_x-delta));
float cur_brightness=_BrightNess*dis;
fixed3 rgb = fixed3(1,1,1)*cur_brightness;
return fixed4(rgb,1);
}
fixed4 frag (v2f i) : SV_Target
{
fixed4 col = tex2D(_MainTex, i.uv);
//透明不闪光
clip(col.a-0.1);
fixed4 brighness = blinn(i.uv);
col = col+brighness;
return col;
}
ENDCG
}
}
Fallback "UI/Default"
}
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