OpenGL Shader实例分析（3）等待标识效果

本文实例为大家分享了OpenGL Shader实例，等待标识，不过效率估计不是很高。结果如下：

代码：

Shader "stalendp/waitIcons" {
  CGINCLUDE  

  #include "UnityCG.cginc"
  #pragma target 3.0
  struct v2f {
   float4 pos:SV_POSITION;
   float2 uv : TEXCOORD0;
  };  

  v2f vert(appdata_base v) {
   v2f o;
   o.pos = mul (UNITY_MATRIX_MVP, v.vertex);
   o.uv = v.texcoord.xy;
   return o;
  }  

  fixed calcDot(fixed a, fixed ca, fixed2 uv) {
   a /= 57.295779513;
   ca /= 57.295779513;
   fixed tt = 180/57.295779513;
   uv = (fixed2(cos(a), sin(a)) * 0.2+ uv)*10;
   fixed adit = tt*2*step(tt, a-ca);
   fixed r = 1-step(ca + adit, a);
   r *= lerp(0.2, -1, saturate((ca-a+adit)/25))*2;
   return smoothstep(r-0.2, r, length(uv.xy));
  }

  fixed4 frag(v2f input) : COLOR0 {
   float2 uv = input.uv.xy - float2(0.5);
   float rx = fmod(uv.x, 0.4);
   float ry = fmod(uv.y, 0.4);
   float mx = step(0.4, abs(uv.x));
   float my = step(0.4, abs(uv.y));
   float alpha = 1- mx*my*step(0.1, length(half2(rx,ry)));
   alpha*=0.9; 

   fixed4 foreColor = fixed4(1);
   fixed4 bgColor = fixed4(fixed3(0.4),alpha);
   fixed4 result = bgColor;

   fixed ca = fmod(_Time.y, 2)*180;

 bgColor = lerp(foreColor, bgColor, calcDot(0, ca, uv));
 bgColor = lerp(foreColor, bgColor, calcDot(30, ca, uv));
 bgColor = lerp(foreColor, bgColor, calcDot(60, ca, uv));
 bgColor = lerp(foreColor, bgColor, calcDot(90, ca, uv));
 bgColor = lerp(foreColor, bgColor, calcDot(120, ca, uv));
 bgColor = lerp(foreColor, bgColor, calcDot(150, ca, uv));
 bgColor = lerp(foreColor, bgColor, calcDot(180, ca, uv));
 bgColor = lerp(foreColor, bgColor, calcDot(210, ca, uv));
 bgColor = lerp(foreColor, bgColor, calcDot(240, ca, uv));
 bgColor = lerp(foreColor, bgColor, calcDot(270, ca, uv));
 bgColor = lerp(foreColor, bgColor, calcDot(300, ca, uv));
 bgColor = lerp(foreColor, bgColor, calcDot(330, ca, uv));

   return bgColor;
  }
 ENDCG  

 SubShader {
  LOD 200
  Tags {"Queue" = "Transparent"}
  ZWrite Off
  Blend SrcAlpha OneMinusSrcAlpha
  Pass {
   CGPROGRAM  

   #pragma vertex vert
   #pragma fragment frag
   #pragma fragmentoption ARB_precision_hint_fastest   

   ENDCG
  }  

 }
 FallBack Off
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。