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Unity中的模糊效果（基于URP）

作者：神奇cpp | 2024-08-19 10:00:20

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Unity中的模糊效果（基于URP）

十种模糊效果，以后处理方式实现

一，高斯模糊（Gaussian Blur）

片源代码


float4 FragGaussianBlur(v2f i): SV_Target
{
    half4 color = float4(0, 0, 0, 0);
 
    color += 0.40 * SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv);
    color += 0.15 * SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv01.xy);
    color += 0.15 * SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv01.zw);
    color += 0.10 * SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv23.xy);
    color += 0.10 * SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv23.zw);
    color += 0.05 * SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv45.xy);
    color += 0.05 * SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv45.zw);
 
    return color;
}

Gaussian Blur Off

Gaussian Blur On

二，方框模糊（Box Blur）

片源代码


half4 BoxFilter_4Tap(TEXTURE2D_ARGS(tex, samplerTex), float2 uv, float2 texelSize)
{
    float4 d = texelSize.xyxy * float4(-1.0, -1.0, 1.0, 1.0);
 
    half4 s = 0;
    s = SAMPLE_TEXTURE2D(tex, samplerTex, uv + d.xy) * 0.25h;  // 1 MUL
    s += SAMPLE_TEXTURE2D(tex, samplerTex, uv + d.zy) * 0.25h; // 1 MAD
    s += SAMPLE_TEXTURE2D(tex, samplerTex, uv + d.xw) * 0.25h; // 1 MAD
    s += SAMPLE_TEXTURE2D(tex, samplerTex, uv + d.zw) * 0.25h; // 1 MAD
 
    return s;
}

Box Blur Off

Box Blur On

三，Kawase模糊（Kawase Blur）

片源代码


half4 KawaseBlur(TEXTURE2D_ARGS(tex, samplerTex), float2 uv, float2 texelSize, half pixelOffset)
{
    half4 o = 0;
    o += SAMPLE_TEXTURE2D(tex, samplerTex, uv + float2(pixelOffset +0.5, pixelOffset +0.5) * texelSize); 
    o += SAMPLE_TEXTURE2D(tex, samplerTex, uv + float2(-pixelOffset -0.5, pixelOffset +0.5) * texelSize); 
    o += SAMPLE_TEXTURE2D(tex, samplerTex, uv + float2(-pixelOffset -0.5, -pixelOffset -0.5) * texelSize); 
    o += SAMPLE_TEXTURE2D(tex, samplerTex, uv + float2(pixelOffset +0.5, -pixelOffset -0.5) * texelSize); 
    return o * 0.25;
}

Kawase Blur Off

Kawase Blur On

四、双重模糊（Dual Blur）

片源代码


half4 Frag_DownSample(v2f_DownSample i): SV_Target
{
    half4 sum = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv) * 4;
    sum += SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv01.xy);
    sum += SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv01.zw);
    sum += SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv23.xy);
    sum += SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv23.zw);
 
    return sum * 0.125;
}
 
half4 Frag_UpSample(v2f_UpSample i): SV_Target
{
    half4 sum = 0;
    sum += SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv01.xy);
    sum += SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv01.zw) * 2;
    sum += SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv23.xy);
    sum += SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv23.zw) * 2;
    sum += SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv45.xy);
    sum += SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv45.zw) * 2;
    sum += SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv67.xy);
    sum += SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv67.zw) * 2;
 
    return sum * 0.0833;
}

Dual Kawase Blur Off

Dual Kawase Blur On

五、散景模糊（Bokeh Blur）

片源代码


half4 BokehBlur(VaryingsDefault i)
{
    half2x2 rot = half2x2(_GoldenRot);
    half4 accumulator = 0.0;
    half4 divisor = 0.0;
 
    half r = 1.0;
    half2 angle = half2(0.0, _Radius);
 
    for (int j = 0; j < _Iteration; j++)
    {
        r += 1.0 / r;
        angle = mul(rot, angle);
        half4 bokeh = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, float2(i.texcoord + _PixelSize * (r - 1.0) * angle));
        accumulator += bokeh * bokeh;
        divisor += bokeh;
    }
    return accumulator / divisor;
}

Bokeh Blur Off

Bokeh Blur On

六、移轴模糊（Tilt Shift Blur）

片源代码


float TiltShiftMask(float2 uv)
{
    float centerY = uv.y * 2.0 - 1.0 + _Offset; // [0,1] -> [-1,1]
    return pow(abs(centerY * _Area), _Spread);
}

Tilt Shift Blur Off

Tilt Shift Blur On

七、光圈模糊（Iris Blur）

片源代码


float IrisMask(float2 uv)
{
    float2 center = uv * 2.0 - 1.0 + _Offset; // [0,1] -> [-1,1] 
    return dot(center, center) * _AreaSize;
}

Iris Blur Off

Iris Blur On

八、粒状模糊（Grainy Blur）

片源代码


float Rand(float2 n)
{
    return sin(dot(n, half2(1233.224, 1743.335)));
}
	
half4 GrainyBlur(VaryingsDefault i)
{
    half2 randomOffset = float2(0.0, 0.0);
    half4 finalColor = half4(0.0, 0.0, 0.0, 0.0);
    float random = Rand(i.texcoord);
		
    for (int k = 0; k < int(_Iteration); k ++)
    {
	random = frac(43758.5453 * random + 0.61432);;
	randomOffset.x = (random - 0.5) * 2.0;
	random = frac(43758.5453 * random + 0.61432);
	randomOffset.y = (random - 0.5) * 2.0;
			
	finalColor += SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, half2(i.texcoord + randomOffset * _BlurRadius));
     }
     return finalColor / _Iteration;
}

Grainy Blur Off

Grainy Blur On

九、径向模糊（Radial Blur）

片源代码


half4 RadialBlur(VaryingsDefault i)
{
    float2 blurVector = (_RadialCenter - i.texcoord.xy) * _BlurRadius;
 
    half4 acumulateColor = half4(0, 0, 0, 0);
 
    [unroll(30)]
    for (int j = 0; j < _Iteration; j ++)
    {
        acumulateColor += SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.texcoord);
        i.texcoord.xy += blurVector;
    }
 
    return acumulateColor / _Iteration;
}

Radial Blur Off

Radial Blur On

十、方向模糊（Directional Blur）

片源代码


half4 DirectionalBlur(VaryingsDefault i)
{
    half4 color = half4(0.0, 0.0, 0.0, 0.0);
 
    for (int k = -_Iteration; k < _Iteration; k++)
    {
        color += SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.texcoord - _Direction * k);
    }
    half4 finalColor = color / (_Iteration * 2.0);
 
    return finalColor;
}

Directional Blur Off

Directional Blur On

性能对比

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