d832d993c5
These replace float3 and packed_float3 in various places in the kernel where a spectral color representation will be used in the future. That representation will require more than 3 channels and conversion to from/RGB. The kernel code was refactored to remove the assumption that Spectrum and RGB colors are the same thing. There are no functional changes, Spectrum is still a float3 and the conversion functions are no-ops. Differential Revision: https://developer.blender.org/D15535
106 lines
3.1 KiB
C++
106 lines
3.1 KiB
C++
/* SPDX-License-Identifier: BSD-3-Clause
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*
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* Adapted from Open Shading Language
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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 2011-2022 Blender Foundation. */
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#include <OSL/genclosure.h>
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#include "kernel/device/cpu/compat.h"
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#include "kernel/osl/closures.h"
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// clang-format off
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#include "kernel/device/cpu/compat.h"
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#include "kernel/device/cpu/globals.h"
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#include "kernel/types.h"
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#include "kernel/closure/alloc.h"
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#include "kernel/closure/bsdf_util.h"
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#include "kernel/closure/bsdf_diffuse.h"
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#include "kernel/closure/bsdf_principled_diffuse.h"
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#include "kernel/closure/bssrdf.h"
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#include "kernel/util/color.h"
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// clang-format on
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CCL_NAMESPACE_BEGIN
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using namespace OSL;
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static ustring u_burley("burley");
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static ustring u_random_walk_fixed_radius("random_walk_fixed_radius");
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static ustring u_random_walk("random_walk");
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class CBSSRDFClosure : public CClosurePrimitive {
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public:
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Bssrdf params;
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float ior;
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ustring method;
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CBSSRDFClosure()
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{
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params.roughness = FLT_MAX;
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params.anisotropy = 1.0f;
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ior = 1.4f;
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}
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void setup(ShaderData *sd, uint32_t path_flag, float3 weight)
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{
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params.N = ensure_valid_reflection(sd->Ng, sd->I, params.N);
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if (method == u_burley) {
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alloc(sd, path_flag, weight, CLOSURE_BSSRDF_BURLEY_ID);
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}
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else if (method == u_random_walk_fixed_radius) {
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alloc(sd, path_flag, weight, CLOSURE_BSSRDF_RANDOM_WALK_FIXED_RADIUS_ID);
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}
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else if (method == u_random_walk) {
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alloc(sd, path_flag, weight, CLOSURE_BSSRDF_RANDOM_WALK_ID);
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}
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}
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void alloc(ShaderData *sd, uint32_t path_flag, float3 weight, ClosureType type)
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{
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Bssrdf *bssrdf = bssrdf_alloc(sd, rgb_to_spectrum(weight));
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if (bssrdf) {
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/* disable in case of diffuse ancestor, can't see it well then and
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* adds considerably noise due to probabilities of continuing path
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* getting lower and lower */
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if (path_flag & PATH_RAY_DIFFUSE_ANCESTOR) {
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params.radius = zero_spectrum();
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}
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/* create one closure per color channel */
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bssrdf->radius = params.radius;
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bssrdf->albedo = params.albedo;
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bssrdf->N = params.N;
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bssrdf->roughness = params.roughness;
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bssrdf->anisotropy = clamp(params.anisotropy, 0.0f, 0.9f);
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sd->flag |= bssrdf_setup(sd, bssrdf, (ClosureType)type, clamp(ior, 1.01f, 3.8f));
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}
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}
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};
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ClosureParam *closure_bssrdf_params()
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{
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static ClosureParam params[] = {
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CLOSURE_STRING_PARAM(CBSSRDFClosure, method),
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CLOSURE_FLOAT3_PARAM(CBSSRDFClosure, params.N),
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CLOSURE_FLOAT3_PARAM(CBSSRDFClosure, params.radius),
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CLOSURE_FLOAT3_PARAM(CBSSRDFClosure, params.albedo),
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CLOSURE_FLOAT_KEYPARAM(CBSSRDFClosure, params.roughness, "roughness"),
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CLOSURE_FLOAT_KEYPARAM(CBSSRDFClosure, ior, "ior"),
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CLOSURE_FLOAT_KEYPARAM(CBSSRDFClosure, params.anisotropy, "anisotropy"),
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CLOSURE_STRING_KEYPARAM(CBSSRDFClosure, label, "label"),
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CLOSURE_FINISH_PARAM(CBSSRDFClosure)};
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return params;
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}
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CCLOSURE_PREPARE(closure_bssrdf_prepare, CBSSRDFClosure)
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CCL_NAMESPACE_END
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