0803119725
This includes much improved GPU rendering performance, viewport interactivity, new shadow catcher, revamped sampling settings, subsurface scattering anisotropy, new GPU volume sampling, improved PMJ sampling pattern, and more. Some features have also been removed or changed, breaking backwards compatibility. Including the removal of the OpenCL backend, for which alternatives are under development. Release notes and code docs: https://wiki.blender.org/wiki/Reference/Release_Notes/3.0/Cycles https://wiki.blender.org/wiki/Source/Render/Cycles Credits: * Sergey Sharybin * Brecht Van Lommel * Patrick Mours (OptiX backend) * Christophe Hery (subsurface scattering anisotropy) * William Leeson (PMJ sampling pattern) * Alaska (various fixes and tweaks) * Thomas Dinges (various fixes) For the full commit history, see the cycles-x branch. This squashes together all the changes since intermediate changes would often fail building or tests. Ref T87839, T87837, T87836 Fixes T90734, T89353, T80267, T80267, T77185, T69800
302 lines
11 KiB
C
302 lines
11 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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#pragma once
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CCL_NAMESPACE_BEGIN
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typedef ccl_addr_space struct HairBsdf {
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SHADER_CLOSURE_BASE;
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float3 T;
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float roughness1;
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float roughness2;
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float offset;
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} HairBsdf;
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static_assert(sizeof(ShaderClosure) >= sizeof(HairBsdf), "HairBsdf is too large!");
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ccl_device int bsdf_hair_reflection_setup(HairBsdf *bsdf)
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{
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bsdf->type = CLOSURE_BSDF_HAIR_REFLECTION_ID;
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bsdf->roughness1 = clamp(bsdf->roughness1, 0.001f, 1.0f);
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bsdf->roughness2 = clamp(bsdf->roughness2, 0.001f, 1.0f);
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return SD_BSDF | SD_BSDF_HAS_EVAL;
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}
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ccl_device int bsdf_hair_transmission_setup(HairBsdf *bsdf)
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{
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bsdf->type = CLOSURE_BSDF_HAIR_TRANSMISSION_ID;
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bsdf->roughness1 = clamp(bsdf->roughness1, 0.001f, 1.0f);
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bsdf->roughness2 = clamp(bsdf->roughness2, 0.001f, 1.0f);
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return SD_BSDF | SD_BSDF_HAS_EVAL;
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}
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ccl_device float3 bsdf_hair_reflection_eval_reflect(const ShaderClosure *sc,
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const float3 I,
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const float3 omega_in,
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float *pdf)
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{
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const HairBsdf *bsdf = (const HairBsdf *)sc;
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float offset = bsdf->offset;
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float3 Tg = bsdf->T;
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float roughness1 = bsdf->roughness1;
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float roughness2 = bsdf->roughness2;
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float Iz = dot(Tg, I);
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float3 locy = normalize(I - Tg * Iz);
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float theta_r = M_PI_2_F - fast_acosf(Iz);
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float omega_in_z = dot(Tg, omega_in);
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float3 omega_in_y = normalize(omega_in - Tg * omega_in_z);
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float theta_i = M_PI_2_F - fast_acosf(omega_in_z);
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float cosphi_i = dot(omega_in_y, locy);
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if (M_PI_2_F - fabsf(theta_i) < 0.001f || cosphi_i < 0.0f) {
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*pdf = 0.0f;
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return make_float3(*pdf, *pdf, *pdf);
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}
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float roughness1_inv = 1.0f / roughness1;
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float roughness2_inv = 1.0f / roughness2;
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float phi_i = fast_acosf(cosphi_i) * roughness2_inv;
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phi_i = fabsf(phi_i) < M_PI_F ? phi_i : M_PI_F;
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float costheta_i = fast_cosf(theta_i);
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float a_R = fast_atan2f(((M_PI_2_F + theta_r) * 0.5f - offset) * roughness1_inv, 1.0f);
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float b_R = fast_atan2f(((-M_PI_2_F + theta_r) * 0.5f - offset) * roughness1_inv, 1.0f);
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float theta_h = (theta_i + theta_r) * 0.5f;
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float t = theta_h - offset;
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float phi_pdf = fast_cosf(phi_i * 0.5f) * 0.25f * roughness2_inv;
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float theta_pdf = roughness1 /
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(2 * (t * t + roughness1 * roughness1) * (a_R - b_R) * costheta_i);
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*pdf = phi_pdf * theta_pdf;
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return make_float3(*pdf, *pdf, *pdf);
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}
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ccl_device float3 bsdf_hair_transmission_eval_reflect(const ShaderClosure *sc,
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const float3 I,
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const float3 omega_in,
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float *pdf)
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{
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return make_float3(0.0f, 0.0f, 0.0f);
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}
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ccl_device float3 bsdf_hair_reflection_eval_transmit(const ShaderClosure *sc,
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const float3 I,
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const float3 omega_in,
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float *pdf)
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{
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return make_float3(0.0f, 0.0f, 0.0f);
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}
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ccl_device float3 bsdf_hair_transmission_eval_transmit(const ShaderClosure *sc,
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const float3 I,
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const float3 omega_in,
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float *pdf)
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{
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const HairBsdf *bsdf = (const HairBsdf *)sc;
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float offset = bsdf->offset;
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float3 Tg = bsdf->T;
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float roughness1 = bsdf->roughness1;
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float roughness2 = bsdf->roughness2;
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float Iz = dot(Tg, I);
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float3 locy = normalize(I - Tg * Iz);
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float theta_r = M_PI_2_F - fast_acosf(Iz);
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float omega_in_z = dot(Tg, omega_in);
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float3 omega_in_y = normalize(omega_in - Tg * omega_in_z);
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float theta_i = M_PI_2_F - fast_acosf(omega_in_z);
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float phi_i = fast_acosf(dot(omega_in_y, locy));
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if (M_PI_2_F - fabsf(theta_i) < 0.001f) {
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*pdf = 0.0f;
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return make_float3(*pdf, *pdf, *pdf);
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}
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float costheta_i = fast_cosf(theta_i);
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float roughness1_inv = 1.0f / roughness1;
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float a_TT = fast_atan2f(((M_PI_2_F + theta_r) / 2 - offset) * roughness1_inv, 1.0f);
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float b_TT = fast_atan2f(((-M_PI_2_F + theta_r) / 2 - offset) * roughness1_inv, 1.0f);
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float c_TT = 2 * fast_atan2f(M_PI_2_F / roughness2, 1.0f);
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float theta_h = (theta_i + theta_r) / 2;
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float t = theta_h - offset;
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float phi = fabsf(phi_i);
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float p = M_PI_F - phi;
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float theta_pdf = roughness1 /
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(2 * (t * t + roughness1 * roughness1) * (a_TT - b_TT) * costheta_i);
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float phi_pdf = roughness2 / (c_TT * (p * p + roughness2 * roughness2));
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*pdf = phi_pdf * theta_pdf;
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return make_float3(*pdf, *pdf, *pdf);
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}
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ccl_device int bsdf_hair_reflection_sample(const ShaderClosure *sc,
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float3 Ng,
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float3 I,
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float3 dIdx,
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float3 dIdy,
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float randu,
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float randv,
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float3 *eval,
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float3 *omega_in,
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float3 *domega_in_dx,
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float3 *domega_in_dy,
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float *pdf)
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{
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const HairBsdf *bsdf = (const HairBsdf *)sc;
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float offset = bsdf->offset;
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float3 Tg = bsdf->T;
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float roughness1 = bsdf->roughness1;
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float roughness2 = bsdf->roughness2;
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float Iz = dot(Tg, I);
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float3 locy = normalize(I - Tg * Iz);
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float3 locx = cross(locy, Tg);
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float theta_r = M_PI_2_F - fast_acosf(Iz);
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float roughness1_inv = 1.0f / roughness1;
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float a_R = fast_atan2f(((M_PI_2_F + theta_r) * 0.5f - offset) * roughness1_inv, 1.0f);
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float b_R = fast_atan2f(((-M_PI_2_F + theta_r) * 0.5f - offset) * roughness1_inv, 1.0f);
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float t = roughness1 * tanf(randu * (a_R - b_R) + b_R);
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float theta_h = t + offset;
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float theta_i = 2 * theta_h - theta_r;
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float costheta_i, sintheta_i;
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fast_sincosf(theta_i, &sintheta_i, &costheta_i);
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float phi = 2 * safe_asinf(1 - 2 * randv) * roughness2;
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float phi_pdf = fast_cosf(phi * 0.5f) * 0.25f / roughness2;
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float theta_pdf = roughness1 /
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(2 * (t * t + roughness1 * roughness1) * (a_R - b_R) * costheta_i);
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float sinphi, cosphi;
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fast_sincosf(phi, &sinphi, &cosphi);
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*omega_in = (cosphi * costheta_i) * locy - (sinphi * costheta_i) * locx + (sintheta_i)*Tg;
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// differentials - TODO: find a better approximation for the reflective bounce
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#ifdef __RAY_DIFFERENTIALS__
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*domega_in_dx = 2 * dot(locy, dIdx) * locy - dIdx;
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*domega_in_dy = 2 * dot(locy, dIdy) * locy - dIdy;
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#endif
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*pdf = fabsf(phi_pdf * theta_pdf);
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if (M_PI_2_F - fabsf(theta_i) < 0.001f)
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*pdf = 0.0f;
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*eval = make_float3(*pdf, *pdf, *pdf);
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return LABEL_REFLECT | LABEL_GLOSSY;
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}
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ccl_device int bsdf_hair_transmission_sample(const ShaderClosure *sc,
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float3 Ng,
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float3 I,
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float3 dIdx,
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float3 dIdy,
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float randu,
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float randv,
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float3 *eval,
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float3 *omega_in,
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float3 *domega_in_dx,
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float3 *domega_in_dy,
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float *pdf)
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{
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const HairBsdf *bsdf = (const HairBsdf *)sc;
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float offset = bsdf->offset;
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float3 Tg = bsdf->T;
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float roughness1 = bsdf->roughness1;
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float roughness2 = bsdf->roughness2;
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float Iz = dot(Tg, I);
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float3 locy = normalize(I - Tg * Iz);
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float3 locx = cross(locy, Tg);
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float theta_r = M_PI_2_F - fast_acosf(Iz);
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float roughness1_inv = 1.0f / roughness1;
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float a_TT = fast_atan2f(((M_PI_2_F + theta_r) / 2 - offset) * roughness1_inv, 1.0f);
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float b_TT = fast_atan2f(((-M_PI_2_F + theta_r) / 2 - offset) * roughness1_inv, 1.0f);
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float c_TT = 2 * fast_atan2f(M_PI_2_F / roughness2, 1.0f);
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float t = roughness1 * tanf(randu * (a_TT - b_TT) + b_TT);
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float theta_h = t + offset;
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float theta_i = 2 * theta_h - theta_r;
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float costheta_i, sintheta_i;
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fast_sincosf(theta_i, &sintheta_i, &costheta_i);
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float p = roughness2 * tanf(c_TT * (randv - 0.5f));
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float phi = p + M_PI_F;
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float theta_pdf = roughness1 /
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(2 * (t * t + roughness1 * roughness1) * (a_TT - b_TT) * costheta_i);
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float phi_pdf = roughness2 / (c_TT * (p * p + roughness2 * roughness2));
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float sinphi, cosphi;
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fast_sincosf(phi, &sinphi, &cosphi);
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*omega_in = (cosphi * costheta_i) * locy - (sinphi * costheta_i) * locx + (sintheta_i)*Tg;
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// differentials - TODO: find a better approximation for the transmission bounce
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#ifdef __RAY_DIFFERENTIALS__
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*domega_in_dx = 2 * dot(locy, dIdx) * locy - dIdx;
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*domega_in_dy = 2 * dot(locy, dIdy) * locy - dIdy;
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#endif
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*pdf = fabsf(phi_pdf * theta_pdf);
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if (M_PI_2_F - fabsf(theta_i) < 0.001f) {
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*pdf = 0.0f;
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}
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*eval = make_float3(*pdf, *pdf, *pdf);
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/* TODO(sergey): Should always be negative, but seems some precision issue
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* is involved here.
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*/
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kernel_assert(dot(locy, *omega_in) < 1e-4f);
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return LABEL_TRANSMIT | LABEL_GLOSSY;
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}
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CCL_NAMESPACE_END
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