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2. Support "Subsurface Profile" shading mobile by preintegral burley diffusion on ring, just like the PreIntegrated Skin, but could be generated at runtime based on the Burley inputs. #jira UE-101323 #rb Dmitriy.Dyomin, Tiantian.Xie #p4v-preflight-copy 16327658 #preflight 61013bb05938f900010c8402 [CL 16982577 by wei liu in ue5-main branch]
63 lines
3.2 KiB
Plaintext
63 lines
3.2 KiB
Plaintext
// Copyright Epic Games, Inc. All Rights Reserved.
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/*=============================================================================================
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SubsurfaceProfileCommon.ush: Subsurface scattering parameter lookup / decoding constants.
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=============================================================================================*/
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#pragma once
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// NOTE: Changing offsets below requires updating all instances of #SSSS_CONSTANTS
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// TODO: This needs to be defined in a single place and shared between C++ and shaders!
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#define SSSS_SUBSURFACE_COLOR_OFFSET 0
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#define BSSS_SURFACEALBEDO_OFFSET (SSSS_SUBSURFACE_COLOR_OFFSET+1)
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#define BSSS_DMFP_OFFSET (BSSS_SURFACEALBEDO_OFFSET+1)
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#define SSSS_TRANSMISSION_OFFSET (BSSS_DMFP_OFFSET+1)
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#define SSSS_BOUNDARY_COLOR_BLEED_OFFSET (SSSS_TRANSMISSION_OFFSET+1)
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#define SSSS_APPROXIMATE_SURFACEALBEDO_OFFSET (SSSS_BOUNDARY_COLOR_BLEED_OFFSET+1)
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#define SSSS_APPROXIMATE_DMFP_OFFSET (SSSS_APPROXIMATE_SURFACEALBEDO_OFFSET+1)
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#define SSSS_DUAL_SPECULAR_OFFSET (SSSS_APPROXIMATE_DMFP_OFFSET+1)
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#define SSSS_KERNEL0_OFFSET (SSSS_DUAL_SPECULAR_OFFSET+1)
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#define SSSS_KERNEL0_SIZE 13
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#define SSSS_KERNEL1_OFFSET (SSSS_KERNEL0_OFFSET + SSSS_KERNEL0_SIZE)
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#define SSSS_KERNEL1_SIZE 9
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#define SSSS_KERNEL2_OFFSET (SSSS_KERNEL1_OFFSET + SSSS_KERNEL1_SIZE)
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#define SSSS_KERNEL2_SIZE 6
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#define SSSS_KERNEL_TOTAL_SIZE (SSSS_KERNEL0_SIZE + SSSS_KERNEL1_SIZE + SSSS_KERNEL2_SIZE)
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#define SSSS_TRANSMISSION_PROFILE_OFFSET (SSSS_KERNEL0_OFFSET + SSSS_KERNEL_TOTAL_SIZE)
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#define SSSS_TRANSMISSION_PROFILE_SIZE 32
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#define BSSS_TRANSMISSION_PROFILE_OFFSET (SSSS_TRANSMISSION_PROFILE_OFFSET + SSSS_TRANSMISSION_PROFILE_SIZE)
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#define BSSS_TRANSMISSION_PROFILE_SIZE SSSS_TRANSMISSION_PROFILE_SIZE
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#define SSSS_MAX_TRANSMISSION_PROFILE_DISTANCE 5.0f // See MaxTransmissionProfileDistance in ComputeTransmissionProfile(), SeparableSSS.cpp
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#define SSSS_MAX_DUAL_SPECULAR_ROUGHNESS 2.0f
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// Threshold value at which model switches from SSS to default lit
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#define SSSS_OPACITY_THRESHOLD_EPS 0.10
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// One profile per line, encoded using constants above. See FSubsurfaceProfileTexture::CreateTexture() in SubsurfaceProfile.cpp.
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// By default, SSProfilesTexture is "Texture2D SSProfilesTexture", but it can be remapped as in BasePassCommon.usf.
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#ifndef SSProfilesTexture
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Texture2D SSProfilesTexture;
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#endif
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// Rename to allow the base pass to intercept with a value from its pass uniform buffer
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#ifndef ActualSSProfilesTexture
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#define ActualSSProfilesTexture SSProfilesTexture
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Texture2DArray SSProfilesPreIntegratedTexture;
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SamplerState SSProfilesPreIntegratedSampler;
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#if COMPILER_GLSL_ES3_1
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SamplerState SSProfilesSampler;
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float4 SSProfilesTextureSizeAndInvSize;
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#endif
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#endif
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half4 GetSubsurfaceProfileTexture(uint SampleIndex, uint SubsurfaceProfileInt)
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{
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#if COMPILER_GLSL_ES3_1 // Force to use a point sampler for Texture2D.Load on OpenGLES platform
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return ActualSSProfilesTexture.SampleLevel(SSProfilesSampler, (uint2(SampleIndex, SubsurfaceProfileInt) + float2(0.5f, 0.5f)) * SSProfilesTextureSizeAndInvSize.zw, 0);
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#else
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return ActualSSProfilesTexture.Load(int3(SampleIndex, SubsurfaceProfileInt, 0));
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#endif
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}
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