forked from bartvdbraak/blender
23c276832b
This commit adds a new distribution to the Glossy, Anisotropic and Glass BSDFs that implements the multiple-scattering microfacet model described in the paper "Multiple-Scattering Microfacet BSDFs with the Smith Model". Essentially, the improvement is that unlike classical GGX, which only models single scattering and assumes the contribution of multiple bounces to be zero, this new model performs a random walk on the microsurface until the ray leaves it again, which ensures perfect energy conservation. In practise, this means that the "darkening problem" - GGX materials becoming darker with increasing roughness - is solved in a physically correct and efficient way. The downside of this model is that it has no (known) analytic expression for evalation. However, it can be evaluated stochastically, and although the correct PDF isn't known either, the properties of MIS and the balance heuristic guarantee an unbiased result at the cost of slightly higher noise. Reviewers: dingto, #cycles, brecht Reviewed By: dingto, #cycles, brecht Subscribers: bliblubli, ace_dragon, gregzaal, brecht, harvester, dingto, marcog, swerner, jtheninja, Blendify, nutel Differential Revision: https://developer.blender.org/D2002
385 lines
16 KiB
C++
385 lines
16 KiB
C++
/*
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* Adapted from Open Shading Language with this license:
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*
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* Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.
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* All Rights Reserved.
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*
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* Modifications Copyright 2011, Blender Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Sony Pictures Imageworks nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <OSL/genclosure.h>
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#include <OSL/oslclosure.h>
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#include "osl_closures.h"
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#include "osl_shader.h"
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#include "util_debug.h"
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#include "util_math.h"
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#include "util_param.h"
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#include "kernel_types.h"
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#include "kernel_compat_cpu.h"
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#include "kernel_globals.h"
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#include "kernel_montecarlo.h"
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#include "kernel_random.h"
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#include "closure/bsdf_util.h"
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#include "closure/bsdf_ashikhmin_velvet.h"
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#include "closure/bsdf_diffuse.h"
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#include "closure/bsdf_microfacet.h"
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#include "closure/bsdf_microfacet_multi.h"
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#include "closure/bsdf_oren_nayar.h"
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#include "closure/bsdf_reflection.h"
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#include "closure/bsdf_refraction.h"
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#include "closure/bsdf_transparent.h"
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#include "closure/bsdf_ashikhmin_shirley.h"
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#include "closure/bsdf_toon.h"
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#include "closure/bsdf_hair.h"
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#include "closure/volume.h"
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CCL_NAMESPACE_BEGIN
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using namespace OSL;
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/* BSDF class definitions */
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BSDF_CLOSURE_CLASS_BEGIN(Diffuse, diffuse, diffuse, LABEL_DIFFUSE)
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CLOSURE_FLOAT3_PARAM(DiffuseClosure, sc.N),
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BSDF_CLOSURE_CLASS_END(Diffuse, diffuse)
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BSDF_CLOSURE_CLASS_BEGIN(Translucent, translucent, translucent, LABEL_DIFFUSE)
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CLOSURE_FLOAT3_PARAM(TranslucentClosure, sc.N),
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BSDF_CLOSURE_CLASS_END(Translucent, translucent)
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BSDF_CLOSURE_CLASS_BEGIN(OrenNayar, oren_nayar, oren_nayar, LABEL_DIFFUSE)
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CLOSURE_FLOAT3_PARAM(OrenNayarClosure, sc.N),
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CLOSURE_FLOAT_PARAM(OrenNayarClosure, sc.data0),
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BSDF_CLOSURE_CLASS_END(OrenNayar, oren_nayar)
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BSDF_CLOSURE_CLASS_BEGIN(Reflection, reflection, reflection, LABEL_SINGULAR)
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CLOSURE_FLOAT3_PARAM(ReflectionClosure, sc.N),
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BSDF_CLOSURE_CLASS_END(Reflection, reflection)
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BSDF_CLOSURE_CLASS_BEGIN(Refraction, refraction, refraction, LABEL_SINGULAR)
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CLOSURE_FLOAT3_PARAM(RefractionClosure, sc.N),
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CLOSURE_FLOAT_PARAM(RefractionClosure, sc.data0),
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BSDF_CLOSURE_CLASS_END(Refraction, refraction)
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BSDF_CLOSURE_CLASS_BEGIN(Transparent, transparent, transparent, LABEL_SINGULAR)
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BSDF_CLOSURE_CLASS_END(Transparent, transparent)
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BSDF_CLOSURE_CLASS_BEGIN(AshikhminVelvet, ashikhmin_velvet, ashikhmin_velvet, LABEL_DIFFUSE)
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CLOSURE_FLOAT3_PARAM(AshikhminVelvetClosure, sc.N),
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CLOSURE_FLOAT_PARAM(AshikhminVelvetClosure, sc.data0),
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BSDF_CLOSURE_CLASS_END(AshikhminVelvet, ashikhmin_velvet)
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BSDF_CLOSURE_CLASS_BEGIN(AshikhminShirley, ashikhmin_shirley_aniso, ashikhmin_shirley, LABEL_GLOSSY|LABEL_REFLECT)
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CLOSURE_FLOAT3_PARAM(AshikhminShirleyClosure, sc.N),
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CLOSURE_FLOAT3_PARAM(AshikhminShirleyClosure, sc.T),
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CLOSURE_FLOAT_PARAM(AshikhminShirleyClosure, sc.data0),
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CLOSURE_FLOAT_PARAM(AshikhminShirleyClosure, sc.data1),
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BSDF_CLOSURE_CLASS_END(AshikhminShirley, ashikhmin_shirley_aniso)
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BSDF_CLOSURE_CLASS_BEGIN(DiffuseToon, diffuse_toon, diffuse_toon, LABEL_DIFFUSE)
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CLOSURE_FLOAT3_PARAM(DiffuseToonClosure, sc.N),
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CLOSURE_FLOAT_PARAM(DiffuseToonClosure, sc.data0),
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CLOSURE_FLOAT_PARAM(DiffuseToonClosure, sc.data1),
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BSDF_CLOSURE_CLASS_END(DiffuseToon, diffuse_toon)
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BSDF_CLOSURE_CLASS_BEGIN(GlossyToon, glossy_toon, glossy_toon, LABEL_GLOSSY)
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CLOSURE_FLOAT3_PARAM(GlossyToonClosure, sc.N),
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CLOSURE_FLOAT_PARAM(GlossyToonClosure, sc.data0),
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CLOSURE_FLOAT_PARAM(GlossyToonClosure, sc.data1),
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BSDF_CLOSURE_CLASS_END(GlossyToon, glossy_toon)
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BSDF_CLOSURE_CLASS_BEGIN(MicrofacetGGX, microfacet_ggx, microfacet_ggx, LABEL_GLOSSY|LABEL_REFLECT)
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CLOSURE_FLOAT3_PARAM(MicrofacetGGXClosure, sc.N),
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CLOSURE_FLOAT_PARAM(MicrofacetGGXClosure, sc.data0),
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BSDF_CLOSURE_CLASS_END(MicrofacetGGX, microfacet_ggx)
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BSDF_CLOSURE_CLASS_BEGIN(MicrofacetGGXAniso, microfacet_ggx_aniso, microfacet_ggx, LABEL_GLOSSY|LABEL_REFLECT)
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CLOSURE_FLOAT3_PARAM(MicrofacetGGXAnisoClosure, sc.N),
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CLOSURE_FLOAT3_PARAM(MicrofacetGGXAnisoClosure, sc.T),
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CLOSURE_FLOAT_PARAM(MicrofacetGGXAnisoClosure, sc.data0),
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CLOSURE_FLOAT_PARAM(MicrofacetGGXAnisoClosure, sc.data1),
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BSDF_CLOSURE_CLASS_END(MicrofacetGGXAniso, microfacet_ggx_aniso)
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BSDF_CLOSURE_CLASS_BEGIN(MicrofacetBeckmann, microfacet_beckmann, microfacet_beckmann, LABEL_GLOSSY|LABEL_REFLECT)
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CLOSURE_FLOAT3_PARAM(MicrofacetBeckmannClosure, sc.N),
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CLOSURE_FLOAT_PARAM(MicrofacetBeckmannClosure, sc.data0),
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BSDF_CLOSURE_CLASS_END(MicrofacetBeckmann, microfacet_beckmann)
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BSDF_CLOSURE_CLASS_BEGIN(MicrofacetBeckmannAniso, microfacet_beckmann_aniso, microfacet_beckmann, LABEL_GLOSSY|LABEL_REFLECT)
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CLOSURE_FLOAT3_PARAM(MicrofacetBeckmannAnisoClosure, sc.N),
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CLOSURE_FLOAT3_PARAM(MicrofacetBeckmannAnisoClosure, sc.T),
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CLOSURE_FLOAT_PARAM(MicrofacetBeckmannAnisoClosure, sc.data0),
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CLOSURE_FLOAT_PARAM(MicrofacetBeckmannAnisoClosure, sc.data1),
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BSDF_CLOSURE_CLASS_END(MicrofacetBeckmannAniso, microfacet_beckmann_aniso)
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BSDF_CLOSURE_CLASS_BEGIN(MicrofacetGGXRefraction, microfacet_ggx_refraction, microfacet_ggx, LABEL_GLOSSY|LABEL_TRANSMIT)
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CLOSURE_FLOAT3_PARAM(MicrofacetGGXRefractionClosure, sc.N),
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CLOSURE_FLOAT_PARAM(MicrofacetGGXRefractionClosure, sc.data0),
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CLOSURE_FLOAT_PARAM(MicrofacetGGXRefractionClosure, sc.data2),
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BSDF_CLOSURE_CLASS_END(MicrofacetGGXRefraction, microfacet_ggx_refraction)
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BSDF_CLOSURE_CLASS_BEGIN(MicrofacetBeckmannRefraction, microfacet_beckmann_refraction, microfacet_beckmann, LABEL_GLOSSY|LABEL_TRANSMIT)
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CLOSURE_FLOAT3_PARAM(MicrofacetBeckmannRefractionClosure, sc.N),
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CLOSURE_FLOAT_PARAM(MicrofacetBeckmannRefractionClosure, sc.data0),
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CLOSURE_FLOAT_PARAM(MicrofacetBeckmannRefractionClosure, sc.data2),
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BSDF_CLOSURE_CLASS_END(MicrofacetBeckmannRefraction, microfacet_beckmann_refraction)
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BSDF_CLOSURE_CLASS_BEGIN(HairReflection, hair_reflection, hair_reflection, LABEL_GLOSSY)
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CLOSURE_FLOAT3_PARAM(HairReflectionClosure, sc.N),
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CLOSURE_FLOAT_PARAM(HairReflectionClosure, sc.data0),
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CLOSURE_FLOAT_PARAM(HairReflectionClosure, sc.data1),
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CLOSURE_FLOAT3_PARAM(HairReflectionClosure, sc.T),
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CLOSURE_FLOAT_PARAM(HairReflectionClosure, sc.data2),
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BSDF_CLOSURE_CLASS_END(HairReflection, hair_reflection)
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BSDF_CLOSURE_CLASS_BEGIN(HairTransmission, hair_transmission, hair_transmission, LABEL_GLOSSY)
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CLOSURE_FLOAT3_PARAM(HairTransmissionClosure, sc.N),
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CLOSURE_FLOAT_PARAM(HairTransmissionClosure, sc.data0),
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CLOSURE_FLOAT_PARAM(HairTransmissionClosure, sc.data1),
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CLOSURE_FLOAT3_PARAM(HairReflectionClosure, sc.T),
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CLOSURE_FLOAT_PARAM(HairReflectionClosure, sc.data2),
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BSDF_CLOSURE_CLASS_END(HairTransmission, hair_transmission)
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VOLUME_CLOSURE_CLASS_BEGIN(VolumeHenyeyGreenstein, henyey_greenstein, LABEL_VOLUME_SCATTER)
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CLOSURE_FLOAT_PARAM(VolumeHenyeyGreensteinClosure, sc.data0),
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VOLUME_CLOSURE_CLASS_END(VolumeHenyeyGreenstein, henyey_greenstein)
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VOLUME_CLOSURE_CLASS_BEGIN(VolumeAbsorption, absorption, LABEL_SINGULAR)
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VOLUME_CLOSURE_CLASS_END(VolumeAbsorption, absorption)
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/* Registration */
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static void register_closure(OSL::ShadingSystem *ss, const char *name, int id, OSL::ClosureParam *params, OSL::PrepareClosureFunc prepare)
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{
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/* optimization: it's possible to not use a prepare function at all and
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* only initialize the actual class when accessing the closure component
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* data, but then we need to map the id to the class somehow */
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ss->register_closure(name, id, params, prepare, NULL, 16);
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}
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void OSLShader::register_closures(OSLShadingSystem *ss_)
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{
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OSL::ShadingSystem *ss = (OSL::ShadingSystem*)ss_;
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int id = 0;
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register_closure(ss, "diffuse", id++,
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bsdf_diffuse_params(), bsdf_diffuse_prepare);
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register_closure(ss, "oren_nayar", id++,
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bsdf_oren_nayar_params(), bsdf_oren_nayar_prepare);
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register_closure(ss, "translucent", id++,
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bsdf_translucent_params(), bsdf_translucent_prepare);
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register_closure(ss, "reflection", id++,
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bsdf_reflection_params(), bsdf_reflection_prepare);
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register_closure(ss, "refraction", id++,
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bsdf_refraction_params(), bsdf_refraction_prepare);
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register_closure(ss, "transparent", id++,
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bsdf_transparent_params(), bsdf_transparent_prepare);
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register_closure(ss, "microfacet_ggx", id++,
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bsdf_microfacet_ggx_params(), bsdf_microfacet_ggx_prepare);
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register_closure(ss, "microfacet_ggx_aniso", id++,
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bsdf_microfacet_ggx_aniso_params(), bsdf_microfacet_ggx_aniso_prepare);
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register_closure(ss, "microfacet_ggx_refraction", id++,
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bsdf_microfacet_ggx_refraction_params(), bsdf_microfacet_ggx_refraction_prepare);
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register_closure(ss, "microfacet_multi_ggx", id++,
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closure_bsdf_microfacet_multi_ggx_params(), closure_bsdf_microfacet_multi_ggx_prepare);
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register_closure(ss, "microfacet_multi_ggx_glass", id++,
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closure_bsdf_microfacet_multi_ggx_glass_params(), closure_bsdf_microfacet_multi_ggx_glass_prepare);
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register_closure(ss, "microfacet_multi_ggx_aniso", id++,
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closure_bsdf_microfacet_multi_ggx_aniso_params(), closure_bsdf_microfacet_multi_ggx_aniso_prepare);
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register_closure(ss, "microfacet_beckmann", id++,
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bsdf_microfacet_beckmann_params(), bsdf_microfacet_beckmann_prepare);
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register_closure(ss, "microfacet_beckmann_aniso", id++,
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bsdf_microfacet_beckmann_aniso_params(), bsdf_microfacet_beckmann_aniso_prepare);
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register_closure(ss, "microfacet_beckmann_refraction", id++,
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bsdf_microfacet_beckmann_refraction_params(), bsdf_microfacet_beckmann_refraction_prepare);
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register_closure(ss, "ashikhmin_shirley", id++,
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bsdf_ashikhmin_shirley_aniso_params(), bsdf_ashikhmin_shirley_aniso_prepare);
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register_closure(ss, "ashikhmin_velvet", id++,
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bsdf_ashikhmin_velvet_params(), bsdf_ashikhmin_velvet_prepare);
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register_closure(ss, "diffuse_toon", id++,
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bsdf_diffuse_toon_params(), bsdf_diffuse_toon_prepare);
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register_closure(ss, "glossy_toon", id++,
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bsdf_glossy_toon_params(), bsdf_glossy_toon_prepare);
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register_closure(ss, "emission", id++,
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closure_emission_params(), closure_emission_prepare);
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register_closure(ss, "background", id++,
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closure_background_params(), closure_background_prepare);
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register_closure(ss, "holdout", id++,
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closure_holdout_params(), closure_holdout_prepare);
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register_closure(ss, "ambient_occlusion", id++,
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closure_ambient_occlusion_params(), closure_ambient_occlusion_prepare);
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register_closure(ss, "diffuse_ramp", id++,
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closure_bsdf_diffuse_ramp_params(), closure_bsdf_diffuse_ramp_prepare);
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register_closure(ss, "phong_ramp", id++,
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closure_bsdf_phong_ramp_params(), closure_bsdf_phong_ramp_prepare);
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register_closure(ss, "bssrdf_cubic", id++,
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closure_bssrdf_cubic_params(), closure_bssrdf_cubic_prepare);
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register_closure(ss, "bssrdf_gaussian", id++,
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closure_bssrdf_gaussian_params(), closure_bssrdf_gaussian_prepare);
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register_closure(ss, "bssrdf_burley", id++,
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closure_bssrdf_burley_params(), closure_bssrdf_burley_prepare);
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register_closure(ss, "hair_reflection", id++,
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bsdf_hair_reflection_params(), bsdf_hair_reflection_prepare);
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register_closure(ss, "hair_transmission", id++,
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bsdf_hair_transmission_params(), bsdf_hair_transmission_prepare);
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register_closure(ss, "henyey_greenstein", id++,
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volume_henyey_greenstein_params(), volume_henyey_greenstein_prepare);
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register_closure(ss, "absorption", id++,
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volume_absorption_params(), volume_absorption_prepare);
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}
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/* Multiscattering GGX closures */
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class MicrofacetMultiClosure : public CBSDFClosure {
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public:
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float3 color;
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/* Technically, the MultiGGX Glass closure may also transmit.
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* However, since this is set statically and only used for caustic flags, this is probably as good as it gets. */
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MicrofacetMultiClosure() : CBSDFClosure(LABEL_GLOSSY|LABEL_REFLECT)
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{
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}
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void setup()
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{
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sc.prim = NULL;
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sc.custom1 = color.x;
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sc.custom2 = color.y;
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sc.custom3 = color.z;
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}
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void blur(float roughness)
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{
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}
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float3 eval_reflect(const float3 &omega_out, const float3 &omega_in, float& pdf) const
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{
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pdf = 0.0f;
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return make_float3(0.0f, 0.0f, 0.0f);
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}
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float3 eval_transmit(const float3 &omega_out, const float3 &omega_in, float& pdf) const
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{
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pdf = 0.0f;
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return make_float3(0.0f, 0.0f, 0.0f);
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}
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int sample(const float3 &Ng,
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const float3 &omega_out, const float3 &domega_out_dx, const float3 &domega_out_dy,
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float randu, float randv,
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float3 &omega_in, float3 &domega_in_dx, float3 &domega_in_dy,
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float &pdf, float3 &eval) const
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{
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pdf = 0;
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return LABEL_NONE;
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}
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};
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class MicrofacetMultiGGXClosure : public MicrofacetMultiClosure {
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public:
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MicrofacetMultiGGXClosure() : MicrofacetMultiClosure() {}
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void setup()
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{
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MicrofacetMultiClosure::setup();
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m_shaderdata_flag = bsdf_microfacet_multi_ggx_setup(&sc);
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}
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};
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ClosureParam *closure_bsdf_microfacet_multi_ggx_params()
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{
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static ClosureParam params[] = {
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CLOSURE_FLOAT3_PARAM(MicrofacetMultiGGXClosure, sc.N),
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CLOSURE_FLOAT_PARAM(MicrofacetMultiGGXClosure, sc.data0),
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CLOSURE_FLOAT3_PARAM(MicrofacetMultiGGXClosure, color),
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CLOSURE_STRING_KEYPARAM(MicrofacetMultiGGXClosure, label, "label"),
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CLOSURE_FINISH_PARAM(MicrofacetMultiGGXClosure)
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};
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return params;
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}
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CCLOSURE_PREPARE(closure_bsdf_microfacet_multi_ggx_prepare, MicrofacetMultiGGXClosure);
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class MicrofacetMultiGGXAnisoClosure : public MicrofacetMultiClosure {
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public:
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MicrofacetMultiGGXAnisoClosure() : MicrofacetMultiClosure() {}
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void setup()
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{
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MicrofacetMultiClosure::setup();
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m_shaderdata_flag = bsdf_microfacet_multi_ggx_aniso_setup(&sc);
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}
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};
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ClosureParam *closure_bsdf_microfacet_multi_ggx_aniso_params()
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{
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static ClosureParam params[] = {
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CLOSURE_FLOAT3_PARAM(MicrofacetMultiGGXClosure, sc.N),
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CLOSURE_FLOAT3_PARAM(MicrofacetMultiGGXClosure, sc.T),
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CLOSURE_FLOAT_PARAM(MicrofacetMultiGGXClosure, sc.data0),
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CLOSURE_FLOAT_PARAM(MicrofacetMultiGGXClosure, sc.data1),
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CLOSURE_FLOAT3_PARAM(MicrofacetMultiGGXClosure, color),
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CLOSURE_STRING_KEYPARAM(MicrofacetMultiGGXClosure, label, "label"),
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CLOSURE_FINISH_PARAM(MicrofacetMultiGGXClosure)
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};
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return params;
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}
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CCLOSURE_PREPARE(closure_bsdf_microfacet_multi_ggx_aniso_prepare, MicrofacetMultiGGXAnisoClosure);
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class MicrofacetMultiGGXGlassClosure : public MicrofacetMultiClosure {
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public:
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MicrofacetMultiGGXGlassClosure() : MicrofacetMultiClosure() {}
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void setup()
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{
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MicrofacetMultiClosure::setup();
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m_shaderdata_flag = bsdf_microfacet_multi_ggx_glass_setup(&sc);
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}
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};
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ClosureParam *closure_bsdf_microfacet_multi_ggx_glass_params()
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{
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static ClosureParam params[] = {
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CLOSURE_FLOAT3_PARAM(MicrofacetMultiGGXClosure, sc.N),
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CLOSURE_FLOAT_PARAM(MicrofacetMultiGGXClosure, sc.data0),
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CLOSURE_FLOAT_PARAM(MicrofacetMultiGGXClosure, sc.data2),
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CLOSURE_FLOAT3_PARAM(MicrofacetMultiGGXClosure, color),
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CLOSURE_STRING_KEYPARAM(MicrofacetMultiGGXClosure, label, "label"),
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CLOSURE_FINISH_PARAM(MicrofacetMultiGGXClosure)
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};
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return params;
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}
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CCLOSURE_PREPARE(closure_bsdf_microfacet_multi_ggx_glass_prepare, MicrofacetMultiGGXGlassClosure);
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CCL_NAMESPACE_END
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