【移动应用开发技术】OpenGL Shader如何实现等待标识效果

【移动应用开发技术】OpenGLShader如何实现等待标识效果

/upload/information/20200623/125/119607.gifShader

"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

fragme