Tonemapping常用的几种算法

SimpleReinhard ：

float4 fragSimpleReinhard(v2f i) : SV_Target

{
float4 texColor = tex2D(_MainTex, i.uv);
float lum = Luminance(texColor.rgb); 
float lumTm = lum * _ExposureAdjustment;//曝光系数
float scale = lumTm / (1+lumTm);  
return float4(texColor.rgb * scale / lum, texColor.a);

}

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Hable：

float4 fragHable(v2f i) : SV_Target
{
const float A = 0.15;