Unity URP shader based gamma correction (Step 1.1)

LitInput.hlsl

inline void InitializeStandardLitSurfaceData(float2 uv, out SurfaceData outSurfaceData)
{
#if UNITY_COLORSPACE_GAMMA
	half gamma =2.2;
#endif

	half4 albedoAlpha = SampleAlbedoAlpha(uv, TEXTURE2D_ARGS(_BaseMap, sampler_BaseMap));
	outSurfaceData.alpha = Alpha(albedoAlpha.a, _BaseColor, _Cutoff);
    
	half4 specGloss = SampleMetallicSpecGloss(uv, albedoAlpha.a);
	outSurfaceData.albedo = albedoAlpha.rgb * _BaseColor.rgb;


#if UNITY_COLORSPACE_GAMMA
	specGloss.rgb = pow(specGloss.rgb, half3(gamma, gamma, gamma));
	outSurfaceData.albedo= pow(outSurfaceData.albedo, half3(gamma, gamma, gamma));
#endif


#if _SPECULAR_SETUP
	outSurfaceData.metallic = 1.0h;
	outSurfaceData.specular = specGloss.rgb;
#else
	outSurfaceData.metallic = specGloss.r;
	outSurfaceData.specular = half3(0.0h, 0.0h, 0.0h);
#endif


	outSurfaceData.smoothness = specGloss.a;
	outSurfaceData.normalTS = SampleNormal(uv, TEXTURE2D_ARGS(_BumpMap, sampler_BumpMap), _BumpScale);
	outSurfaceData.occlusion = SampleOcclusion(uv);
	outSurfaceData.emission = SampleEmission(uv, _EmissionColor.rgb, TEXTURE2D_ARGS(_EmissionMap, sampler_EmissionMap));

#if UNITY_COLORSPACE_GAMMA
	outSurfaceData.occlusion = pow(outSurfaceData.occlusion, half3(gamma, gamma, gamma));
	outSurfaceData.emission = pow(outSurfaceData.emission, half3(gamma, gamma, gamma));
#endif

}