ShadowGun Shaders

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负责特效:真牛X

Shader "MADFINGER/Transparent/Blinking GodRays Billboarded" {

Properties {
    _MainTex ("Base texture", 2D) = "white" {}
    _FadeOutDistNear ("Near fadeout dist", float) = 10
    _FadeOutDistFar ("Far fadeout dist", float) = 10000
    _Multiplier("Color multiplier", float) = 1
    _Bias("Bias",float) = 0
    _TimeOnDuration("ON duration",float) = 0.5
    _TimeOffDuration("OFF duration",float) = 0.5
    _BlinkingTimeOffsScale("Blinking time offset scale (seconds)",float) = 5
    _SizeGrowStartDist("Size grow start dist",float) = 5
    _SizeGrowEndDist("Size grow end dist",float) = 50
    _MaxGrowSize("Max grow size",float) = 2.5
    _NoiseAmount("Noise amount (when zero, pulse wave is used)", Range(0,0.5)) = 0
    _VerticalBillboarding("Vertical billboarding amount", Range(0,1)) = 1
    _ViewerOffset("Viewer offset", float) = 0
    _Color("Color", Color) = (1,1,1,1)
}


SubShader {


    Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" }

    Blend One One
    Cull Off Lighting Off ZWrite Off Fog { Color (0,0,0,0) }

    LOD 100

    CGINCLUDE
    #include "UnityCG.cginc"
    sampler2D _MainTex;

    float _FadeOutDistNear;
    float _FadeOutDistFar;
    float _Multiplier;
    float    _Bias;
    float _TimeOnDuration;
    float    _TimeOffDuration;
    float _BlinkingTimeOffsScale;
    float _SizeGrowStartDist;
    float _SizeGrowEndDist;
    float _MaxGrowSize;
    float _NoiseAmount;
    float _VerticalBillboarding;
    float _ViewerOffset;
    float4 _Color;


    struct v2f {
        float4    pos    : SV_POSITION;
        float2    uv        : TEXCOORD0;
        fixed4    color    : TEXCOORD1;
    };

    void CalcOrthonormalBasis(float3 dir,out float3 right,out float3 up)
    {
        up     = abs(dir.y) > 0.999f ? float3(0,0,1) : float3(0,1,0);
        right = normalize(cross(up,dir));
        up    = cross(dir,right);
    }

    float CalcFadeOutFactor(float dist)
    {
        float        nfadeout    = saturate(dist / _FadeOutDistNear);
        float        ffadeout    = 1 - saturate(max(dist - _FadeOutDistFar,0) * 0.2);

        ffadeout *= ffadeout;

        nfadeout *= nfadeout;
        nfadeout *= nfadeout;

        nfadeout *= ffadeout;

        return nfadeout;
    }

    float CalcDistScale(float dist)
    {
        float        distScale    = min(max(dist - _SizeGrowStartDist,0) / _SizeGrowEndDist,1);

        return distScale * distScale * _MaxGrowSize;
    }


    v2f vert (appdata_full v)
    {
        v2f         o;


        #if 0
        // cheap view space billboarding
        float3    centerOffs        = float3(float(0.5).xx - v.color.rg,0) * v.texcoord1.xyy;
        float3    BBCenter        = v.vertex + centerOffs.xyz;
        float3    viewPos            = mul(UNITY_MATRIX_MV,float4(BBCenter,1)) - centerOffs;
        #else

        float3    centerOffs        = float3(float(0.5).xx - v.color.rg,0) * v.texcoord1.xyy;
        float3    centerLocal    = v.vertex.xyz + centerOffs.xyz;
        float3    viewerLocal    = mul(_World2Object,float4(_WorldSpaceCameraPos,1));
        float3    localDir            = viewerLocal - centerLocal;

        localDir[1] = lerp(0,localDir[1],_VerticalBillboarding);

        float        localDirLength=length(localDir);
        float3    rightLocal;
        float3    upLocal;

        CalcOrthonormalBasis(localDir / localDirLength,rightLocal,upLocal);

        float        distScale        = CalcDistScale(localDirLength) * v.color.a;
        float3    BBNormal        = rightLocal * v.normal.x + upLocal * v.normal.y;
        float3    BBLocalPos    = centerLocal - (rightLocal * centerOffs.x + upLocal * centerOffs.y) + BBNormal * distScale;

        BBLocalPos += _ViewerOffset * localDir;

        #endif

        float        time             = _Time.y + _BlinkingTimeOffsScale * v.color.b;
        float        fracTime    = fmod(time,_TimeOnDuration + _TimeOffDuration);
        float        wave            = smoothstep(0,_TimeOnDuration * 0.25,fracTime)  * (1 - smoothstep(_TimeOnDuration * 0.75,_TimeOnDuration,fracTime));
        float        noiseTime    = time *  (6.2831853f / _TimeOnDuration);
        float        noise            = sin(noiseTime) * (0.5f * cos(noiseTime * 0.6366f + 56.7272f) + 0.5f);
        float        noiseWave    = _NoiseAmount * noise + (1 - _NoiseAmount);

        wave = _NoiseAmount < 0.01f ? wave : noiseWave;
        wave += _Bias;

        o.uv        = v.texcoord.xy;
        o.pos    = mul(UNITY_MATRIX_MVP, float4(BBLocalPos,1));
        o.color    = CalcFadeOutFactor(localDirLength) * _Color * _Multiplier * wave;

        return o;
    }
    ENDCG

    Pass {
        CGPROGRAM
        #pragma vertex vert
        #pragma fragment frag
        #pragma fragmentoption ARB_precision_hint_fastest
        fixed4 frag (v2f i) : COLOR
        {
            return tex2D (_MainTex, i.uv.xy) * i.color;
        }
        ENDCG
    }
}

}

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