unity shader 火焰效果

Shader "ShaderMan/AABBCC"
	{

	Properties{
	_MainTex ("MainTex", 2D) = "white" {}
	}

	SubShader
	{
	Tags { "RenderType" = "Transparent" "Queue" = "Transparent" }

	Pass
	{
	ZWrite Off
	Blend SrcAlpha OneMinusSrcAlpha

	CGPROGRAM
	#pragma vertex vert
	#pragma fragment frag
	#include "UnityCG.cginc"

	struct VertexInput {
    fixed4 vertex : POSITION;
	fixed2 uv:TEXCOORD0;
    fixed4 tangent : TANGENT;
    fixed3 normal : NORMAL;
	//VertexInput
	};


	struct VertexOutput {
	fixed4 pos : SV_POSITION;
	fixed2 uv:TEXCOORD0;
	//VertexOutput
	};

	//Variables
sampler2D _MainTex;

	fixed rand(fixed2 n) {
    return frac(sin(cos(dot(n, fixed2(12.9898,12.1414)))) * 83758.5453);
}

fixed noise(fixed2 n) {
    const fixed2 d = fixed2(0.0, 1.0);
    fixed2 b = floor(n), f = smoothstep(fixed2(0.0,0.0), fixed2(1.0,1.0), frac(n));
    return lerp(lerp(rand(b), rand(b + d.yx), f.x), lerp(rand(b + d.xy), rand(b + d.yy), f.x), f.y);
}

fixed fbm(fixed2 n) {
    fixed total = 0.0, amplitude = 1.0;
    for (int i = 0; i <5; i++) {
        total += noise(n) * amplitude;
        n += n*1.7;
        amplitude *= 0.47;
    }
    return total;
}





	VertexOutput vert (VertexInput v)
	{
	VertexOutput o;
	o.pos = UnityObjectToClipPos (v.vertex);
	o.uv = v.uv;
	//VertexFactory
	return o;
	}
	fixed4 frag(VertexOutput i) : SV_Target
	{
	

    const fixed3 c1 = fixed3(0.5, 0.0, 0.1);
    const fixed3 c2 = fixed3(0.9, 0.1, 0.0);
    const fixed3 c3 = fixed3(0.2, 0.1, 0.7);
    const fixed3 c4 = fixed3(1.0, 0.9, 0.1);
    const fixed3 c5 = fixed3(0.1,0.1,0.1);
    const fixed3 c6 = fixed3(0.9,0.9,0.9);

    fixed2 speed = fixed2(0.1, 0.9);
    fixed shift = 1.327+sin(_Time.y*2.0)/2.4;
    fixed alpha = 1.0;
    
	fixed dist = 3.5-sin(_Time.y*0.4)/1.89;
    
    fixed2 uv = i.uv / 1;
    fixed2 p = i.uv * dist / 1;
    p += sin(p.yx*4.0+fixed2(.2,-.3)*_Time.y)*0.04;
    p += sin(p.yx*8.0+fixed2(.6,+.1)*_Time.y)*0.01;
    
    p.x -= _Time.y/1.1;
    fixed q = fbm(p - _Time.y * 0.3+1.0*sin(_Time.y+0.5)/2.0);
    fixed qb = fbm(p - _Time.y * 0.4+0.1*cos(_Time.y)/2.0);
    fixed q2 = fbm(p - _Time.y * 0.44 - 5.0*cos(_Time.y)/2.0) - 6.0;
    fixed q3 = fbm(p - _Time.y * 0.9 - 10.0*cos(_Time.y)/15.0)-4.0;
    fixed q4 = fbm(p - _Time.y * 1.4 - 20.0*sin(_Time.y)/14.0)+2.0;
    q = (q + qb - .4 * q2 -2.0*q3  + .6*q4)/3.8;
    fixed2 r = fixed2(fbm(p + q /2.0 + _Time.y * speed.x - p.x - p.y), fbm(p + q - _Time.y * speed.y));
    fixed3 c = lerp(c1, c2, fbm(p + r)) + lerp(c3, c4, r.x) - lerp(c5, c6, r.y);
    fixed3 color = fixed3(1.0/(pow(c+1.61,fixed3(4.0,4.0,4.0))) * cos(shift * i.uv.y / 1));
    
    color=fixed3(1.0,.2,.05)/(pow((r.y+r.y)* max(.0,p.y)+0.1, 4.0));;
    color += (tex2D(_MainTex,uv*0.6+fixed2(.5,.1)).xyz*0.01*pow((r.y+r.y)*.65,5.0)+0.055)*lerp( fixed3(.9,.4,.3),fixed3(.7,.5,.2), uv.y);
    color = color/(1.0+max(fixed3(0,0,0),color));
    return fixed4(color.x, color.y, color.z, alpha);

	}
	ENDCG
	}
  }
}

从shadertoy翻译过来的shaderlab语言
效果如下