da376e0237
Cycles uses code from some great open source projects, many thanks them: * BVH building and traversal code from NVidia's "Understanding the Efficiency of Ray Traversal on GPUs": http://code.google.com/p/understanding-the-efficiency-of-ray-traversal-on-gpus/ * Open Shading Language for a large part of the shading system: http://code.google.com/p/openshadinglanguage/ * Blender for procedural textures and a few other nodes. * Approximate Catmull Clark subdivision from NVidia Mesh tools: http://code.google.com/p/nvidia-mesh-tools/ * Sobol direction vectors from: http://web.maths.unsw.edu.au/~fkuo/sobol/ * Film response functions from: http://www.cs.columbia.edu/CAVE/software/softlib/dorf.php
461 lines
9.8 KiB
C
461 lines
9.8 KiB
C
/*
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* Copyright 2011, Blender Foundation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/*
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* ShaderData, used in four steps:
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*
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* Setup from incoming ray, sampled position and background.
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* Execute for surface, volume or displacement.
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* Evaluate one or more closures.
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* Release.
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*
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*/
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#include "svm/bsdf.h"
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#include "svm/emissive.h"
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#include "svm/volume.h"
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#include "svm/svm_bsdf.h"
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#include "svm/svm.h"
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#ifdef WITH_OSL
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#include "osl_shader.h"
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#endif
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CCL_NAMESPACE_BEGIN
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/* ShaderData setup from incoming ray */
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__device_inline void shader_setup_from_ray(KernelGlobals *kg, ShaderData *sd,
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const Intersection *isect, const Ray *ray)
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{
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/* fetch triangle data */
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int prim = kernel_tex_fetch(__prim_index, isect->prim);
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float4 Ns = kernel_tex_fetch(__tri_normal, prim);
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float3 Ng = make_float3(Ns.x, Ns.y, Ns.z);
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int shader = __float_as_int(Ns.w);
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/* vectors */
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sd->P = bvh_triangle_refine(kg, isect, ray);
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sd->Ng = Ng;
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sd->N = Ng;
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sd->I = -ray->D;
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sd->shader = shader;
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sd->flag = 0;
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/* triangle */
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#ifdef __INSTANCING__
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sd->object = isect->object;
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#endif
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sd->prim = prim;
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#ifdef __UV__
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sd->u = isect->u;
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sd->v = isect->v;
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#endif
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/* smooth normal */
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if(sd->shader < 0) {
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sd->N = triangle_smooth_normal(kg, sd->prim, sd->u, sd->v);
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sd->shader = -sd->shader;
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}
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#ifdef __DPDU__
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/* dPdu/dPdv */
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triangle_dPdudv(kg, &sd->dPdu, &sd->dPdv, sd->prim);
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#endif
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#ifdef __INSTANCING__
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if(sd->object != ~0) {
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/* instance transform */
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object_normal_transform(kg, sd->object, &sd->N);
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object_normal_transform(kg, sd->object, &sd->Ng);
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#ifdef __DPDU__
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object_dir_transform(kg, sd->object, &sd->dPdu);
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object_dir_transform(kg, sd->object, &sd->dPdv);
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#endif
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}
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else {
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/* non-instanced object index */
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sd->object = kernel_tex_fetch(__prim_object, isect->prim);
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}
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#endif
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/* backfacing test */
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bool backfacing = (dot(sd->Ng, sd->I) < 0.0f);
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if(backfacing) {
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sd->flag = SD_BACKFACING;
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sd->Ng = -sd->Ng;
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sd->N = -sd->N;
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#ifdef __DPDU__
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sd->dPdu = -sd->dPdu;
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sd->dPdv = -sd->dPdv;
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#endif
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}
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#ifdef __RAY_DIFFERENTIALS__
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/* differentials */
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differential_transfer(&sd->dP, ray->dP, ray->D, ray->dD, sd->Ng, isect->t);
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differential_incoming(&sd->dI, ray->dD);
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differential_dudv(&sd->du, &sd->dv, sd->dPdu, sd->dPdv, sd->dP, sd->Ng);
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#endif
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}
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/* ShaderData setup from position sampled on mesh */
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__device void shader_setup_from_sample(KernelGlobals *kg, ShaderData *sd,
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const float3 P, const float3 Ng, const float3 I,
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int shader, int object, int prim, float u, float v)
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{
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/* vectors */
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sd->P = P;
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sd->N = Ng;
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sd->Ng = Ng;
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sd->I = I;
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sd->shader = shader;
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sd->flag = 0;
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/* primitive */
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#ifdef __INSTANCING__
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sd->object = object;
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#endif
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sd->prim = prim;
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#ifdef __UV__
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sd->u = u;
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sd->v = v;
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#endif
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/* detect instancing, for non-instanced the object index is -object-1 */
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bool instanced = false;
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if(sd->prim != ~0) {
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if(sd->object >= 0)
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instanced = true;
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else
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sd->object = -sd->object-1;
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}
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/* smooth normal */
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if(sd->shader < 0) {
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sd->N = triangle_smooth_normal(kg, sd->prim, sd->u, sd->v);
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sd->shader = -sd->shader;
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#ifdef __INSTANCING__
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if(instanced)
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object_normal_transform(kg, sd->object, &sd->N);
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#endif
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}
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#ifdef __DPDU__
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/* dPdu/dPdv */
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if(sd->prim == ~0) {
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sd->dPdu = make_float3(0.0f, 0.0f, 0.0f);
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sd->dPdv = make_float3(0.0f, 0.0f, 0.0f);
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}
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else {
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triangle_dPdudv(kg, &sd->dPdu, &sd->dPdv, sd->prim);
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#ifdef __INSTANCING__
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if(instanced) {
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object_dir_transform(kg, sd->object, &sd->dPdu);
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object_dir_transform(kg, sd->object, &sd->dPdv);
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}
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#endif
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}
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#endif
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/* backfacing test */
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if(sd->prim != ~0) {
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bool backfacing = (dot(sd->Ng, sd->I) < 0.0f);
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if(backfacing) {
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sd->flag = SD_BACKFACING;
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sd->Ng = -sd->Ng;
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sd->N = -sd->N;
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#ifdef __DPDU__
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sd->dPdu = -sd->dPdu;
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sd->dPdv = -sd->dPdv;
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#endif
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}
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}
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#ifdef __RAY_DIFFERENTIALS__
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/* no ray differentials here yet */
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sd->dP.dx = make_float3(0.0f, 0.0f, 0.0f);
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sd->dP.dy = make_float3(0.0f, 0.0f, 0.0f);
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sd->dI.dx = make_float3(0.0f, 0.0f, 0.0f);
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sd->dI.dy = make_float3(0.0f, 0.0f, 0.0f);
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sd->du.dx = 0.0f;
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sd->du.dy = 0.0f;
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sd->dv.dx = 0.0f;
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sd->dv.dy = 0.0f;
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#endif
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}
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/* ShaderData setup for displacement */
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__device void shader_setup_from_displace(KernelGlobals *kg, ShaderData *sd,
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int object, int prim, float u, float v)
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{
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float3 P, Ng, I = make_float3(0.0f, 0.0f, 0.0f);
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int shader;
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P = triangle_point_MT(kg, prim, u, v);
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Ng = triangle_normal_MT(kg, prim, &shader);
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/* force smooth shading for displacement */
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if(shader >= 0)
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shader = -shader;
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/* watch out: no instance transform currently */
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shader_setup_from_sample(kg, sd, P, Ng, I, shader, object, prim, u, v);
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}
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/* ShaderData setup from ray into background */
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__device_inline void shader_setup_from_background(KernelGlobals *kg, ShaderData *sd, const Ray *ray)
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{
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/* vectors */
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sd->P = ray->D;
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sd->N = -sd->P;
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sd->Ng = -sd->P;
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sd->I = -sd->P;
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sd->shader = kernel_data.background.shader;
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sd->flag = 0;
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#ifdef __INSTANCING__
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sd->object = ~0;
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#endif
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sd->prim = ~0;
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#ifdef __UV__
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sd->u = 0.0f;
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sd->v = 0.0f;
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#endif
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#ifdef __DPDU__
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/* dPdu/dPdv */
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sd->dPdu = make_float3(0.0f, 0.0f, 0.0f);
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sd->dPdv = make_float3(0.0f, 0.0f, 0.0f);
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#endif
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#ifdef __RAY_DIFFERENTIALS__
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/* differentials */
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sd->dP = ray->dD;
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differential_incoming(&sd->dI, sd->dP);
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sd->du.dx = 0.0f;
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sd->du.dy = 0.0f;
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sd->dv.dx = 0.0f;
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sd->dv.dy = 0.0f;
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#endif
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}
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/* BSDF */
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__device int shader_bsdf_sample(KernelGlobals *kg, const ShaderData *sd,
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float randu, float randv, float3 *eval,
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float3 *omega_in, differential3 *domega_in, float *pdf)
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{
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int label;
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*pdf = 0.0f;
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#ifdef WITH_OSL
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if(kg->osl.use)
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label = OSLShader::bsdf_sample(sd, randu, randv, *eval, *omega_in, *domega_in, *pdf);
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else
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#endif
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label = svm_bsdf_sample(sd, randu, randv, eval, omega_in, domega_in, pdf);
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return label;
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}
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__device float3 shader_bsdf_eval(KernelGlobals *kg, const ShaderData *sd,
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const float3 omega_in, float *pdf)
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{
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float3 eval;
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*pdf = 0.0f;
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#ifdef WITH_OSL
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if(kg->osl.use)
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eval = OSLShader::bsdf_eval(sd, omega_in, *pdf);
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else
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#endif
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eval = svm_bsdf_eval(sd, omega_in, pdf);
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return eval;
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}
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__device void shader_bsdf_blur(KernelGlobals *kg, ShaderData *sd, float roughness)
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{
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#ifdef WITH_OSL
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if(!kg->osl.use)
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#endif
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svm_bsdf_blur(sd, roughness);
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}
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/* Emission */
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__device float3 shader_emissive_eval(KernelGlobals *kg, ShaderData *sd)
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{
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#ifdef WITH_OSL
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if(kg->osl.use) {
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return OSLShader::emissive_eval(sd);
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}
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else
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#endif
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{
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return svm_emissive_eval(sd);
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}
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}
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__device void shader_emissive_sample(KernelGlobals *kg, ShaderData *sd,
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float randu, float randv, float3 *eval, float3 *I, float *pdf)
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{
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#ifdef WITH_OSL
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if(kg->osl.use) {
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OSLShader::emissive_sample(sd, randu, randv, eval, I, pdf);
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}
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else
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#endif
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{
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svm_emissive_sample(sd, randu, randv, eval, I, pdf);
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}
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}
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/* Surface Evaluation */
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__device void shader_eval_surface(KernelGlobals *kg, ShaderData *sd,
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float randb, int path_flag)
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{
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#ifdef WITH_OSL
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if(kg->osl.use) {
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OSLShader::eval_surface(kg, sd, randb, path_flag);
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}
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else
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#endif
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{
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#ifdef __SVM__
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svm_eval_nodes(kg, sd, SHADER_TYPE_SURFACE, randb, path_flag);
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#else
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sd->svm_closure = CLOSURE_BSDF_DIFFUSE_ID;
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sd->svm_closure_weight = make_float3(0.8f, 0.8f, 0.8f);
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#endif
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#ifdef __CAUSTICS_TRICKS__
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/* caustic tricks */
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if((path_flag & PATH_RAY_DIFFUSE) && (sd->flag & SD_BSDF_GLOSSY)) {
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if(kernel_data.integrator.no_caustics) {
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sd->flag &= ~(SD_BSDF_GLOSSY|SD_BSDF_HAS_EVAL|SD_EMISSION);
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sd->svm_closure = NBUILTIN_CLOSURES;
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sd->svm_closure_weight = make_float3(0.0f, 0.0f, 0.0f);
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}
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else if(kernel_data.integrator.blur_caustics > 0.0f)
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shader_bsdf_blur(kg, sd, kernel_data.integrator.blur_caustics);
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}
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#endif
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}
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}
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/* Background Evaluation */
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__device float3 shader_eval_background(KernelGlobals *kg, ShaderData *sd, int path_flag)
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{
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#ifdef WITH_OSL
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if(kg->osl.use) {
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return OSLShader::eval_background(kg, sd, path_flag);
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}
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else
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#endif
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{
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#ifdef __SVM__
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svm_eval_nodes(kg, sd, SHADER_TYPE_SURFACE, 0.0f, path_flag);
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#else
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sd->svm_closure_weight = make_float3(0.8f, 0.8f, 0.8f);
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#endif
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return sd->svm_closure_weight;
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}
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}
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/* Volume */
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__device float3 shader_volume_eval_phase(KernelGlobals *kg, ShaderData *sd,
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float3 omega_in, float3 omega_out)
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{
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#ifdef WITH_OSL
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if(kg->osl.use) {
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OSLShader::volume_eval_phase(sd, omega_in, omega_out);
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}
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else
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#endif
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{
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return volume_eval_phase(sd, omega_in, omega_out);
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}
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}
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/* Volume Evaluation */
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__device void shader_eval_volume(KernelGlobals *kg, ShaderData *sd,
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float randb, int path_flag)
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{
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#ifdef WITH_OSL
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if(kg->osl.use) {
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OSLShader::eval_volume(kg, sd, randb, path_flag);
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}
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else
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#endif
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{
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#ifdef __SVM__
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svm_eval_nodes(kg, sd, SHADER_TYPE_VOLUME, randb, path_flag);
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#endif
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}
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}
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/* Displacement Evaluation */
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__device void shader_eval_displacement(KernelGlobals *kg, ShaderData *sd)
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{
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/* this will modify sd->P */
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#ifdef WITH_OSL
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if(kg->osl.use) {
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OSLShader::eval_displacement(kg, sd);
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}
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else
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#endif
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{
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#ifdef __SVM__
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svm_eval_nodes(kg, sd, SHADER_TYPE_DISPLACEMENT, 0.0f, 0);
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#endif
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}
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}
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/* Free ShaderData */
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__device void shader_release(KernelGlobals *kg, ShaderData *sd)
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{
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#ifdef WITH_OSL
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if(kg->osl.use)
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OSLShader::release(kg, sd);
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#endif
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}
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CCL_NAMESPACE_END
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