fe213f80a4
This is the first step of moving the create infos back inside shader sources. All info files are now treated as source files. However, they are not considered in the include tree yet. This will come in another following PR. Each shader source file now generate a `.info` file containing only the create info declarations. This renames all info files so that they do not conflict with their previous versions that were copied (non-generated). Pull Request: https://projects.blender.org/blender/blender/pulls/146676
39 lines
1.2 KiB
GLSL
39 lines
1.2 KiB
GLSL
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#pragma once
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/**
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* Various utilities related to object subsurface light transport.
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*
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* Required resources:
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* - utility_tx
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*/
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#include "infos/eevee_common_infos.hh"
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#include "eevee_utility_tx_lib.glsl"
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#include "gpu_shader_utildefines_lib.glsl"
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float subsurface_transmittance_profile(float u)
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{
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auto &utility_tx = sampler_get(eevee_utility_texture, utility_tx);
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return utility_tx_sample(utility_tx, float2(u, 0.0f), UTIL_SSS_TRANSMITTANCE_PROFILE_LAYER).r;
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}
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/**
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* Returns the amount of light that can travels through a uniform medium and exit at the backface.
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*/
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float3 subsurface_transmission(float3 sss_radii, float thickness)
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{
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sss_radii *= SSS_TRANSMIT_LUT_RADIUS;
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float3 channels_co = saturate(thickness / sss_radii) * SSS_TRANSMIT_LUT_SCALE +
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SSS_TRANSMIT_LUT_BIAS;
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float3 translucency;
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translucency.x = (sss_radii.x > 0.0f) ? subsurface_transmittance_profile(channels_co.x) : 0.0f;
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translucency.y = (sss_radii.y > 0.0f) ? subsurface_transmittance_profile(channels_co.y) : 0.0f;
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translucency.z = (sss_radii.z > 0.0f) ? subsurface_transmittance_profile(channels_co.z) : 0.0f;
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return translucency;
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}
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