intern/cycles/blender/blender_particles.cpp

   1 /*
   2  * Copyright 2011, Blender Foundation.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  17  */
  18
  19 #include "object.h"
  20
  21 #include "mesh.h"
  22 #include "blender_sync.h"
  23 #include "blender_util.h"
  24
  25 #include "util_foreach.h"
  26
  27 CCL_NAMESPACE_BEGIN
  28
  29 /* Utilities */
  30
  31
  32 /* Particles Sync */
  33
  34 bool BlenderSync::object_use_particles(BL::Object b_ob)
  35 {
  36         /* Particle data is only needed for
  37          * a) Billboard render mode if object's own material uses particle info
  38          * b) object/group render mode if any dupli object's material uses particle info
  39          *
  40          * Note: Meshes have to be synced at this point!
  41          */
  42         bool use_particles = false;
  43
  44         BL::Object::particle_systems_iterator b_psys;
  45         for (b_ob.particle_systems.begin(b_psys); b_psys != b_ob.particle_systems.end(); ++b_psys) {
  46                 switch (b_psys->settings().render_type()) {
  47                 /* XXX not implemented yet!
  48                  * billboards/strands would become part of the mesh data (?),
  49                  * so the mesh attributes would store whether particle info is required.
  50                  */
  51                 #if 0
  52                 case BL::ParticleSettings::render_type_BILLBOARD:
  53                 case BL::ParticleSettings::render_type_PATH: {  /* for strand rendering */
  54                         BL::ID key = (BKE_object_is_modified(b_ob))? b_ob: b_ob.data();
  55                         Mesh *mesh = mesh_map.find(key);
  56                         if (mesh) {
  57                                 use_particles |= mesh->need_attribute(scene, ATTR_STD_PARTICLE);
  58                         }
  59                         break;
  60                 }
  61                 #endif
  62
  63                 case BL::ParticleSettings::render_type_OBJECT: {
  64                         BL::Object b_dupli_ob = b_psys->settings().dupli_object();
  65                         if (b_dupli_ob) {
  66                                 BL::ID key = (BKE_object_is_modified(b_dupli_ob))? b_dupli_ob: b_dupli_ob.data();
  67                                 Mesh *mesh = mesh_map.find(key);
  68                                 if (mesh) {
  69                                         use_particles |= mesh->need_attribute(scene, ATTR_STD_PARTICLE);
  70                                 }
  71                         }
  72                         break;
  73                 }
  74
  75                 case BL::ParticleSettings::render_type_GROUP: {
  76                         BL::Group b_dupli_group = b_psys->settings().dupli_group();
  77                         if (b_dupli_group) {
  78                                 BL::Group::objects_iterator b_gob;
  79                                 for (b_dupli_group.objects.begin(b_gob); b_gob != b_dupli_group.objects.end(); ++b_gob) {
  80                                         BL::ID key = (BKE_object_is_modified(*b_gob))? *b_gob: b_gob->data();
  81                                         Mesh *mesh = mesh_map.find(key);
  82                                         if (mesh) {
  83                                                 use_particles |= mesh->need_attribute(scene, ATTR_STD_PARTICLE);
  84                                         }
  85                                 }
  86                         }
  87                         break;
  88                 }
  89
  90                 default:
  91                         /* avoid compiler warning */
  92                         break;
  93                 }
  94         }
  95
  96         return use_particles;
  97 }
  98
  99 static bool use_particle_system(BL::ParticleSystem b_psys)
 100 {
 101         /* only use duplicator particles? disabled particle info for
 102          * halo and billboard to reduce particle count.
 103          * Probably not necessary since particles don't contain a huge amount
 104          * of data compared to other textures.
 105          */
 106         #if 0
 107         int render_type = b_psys->settings().render_type();
 108         return (render_type == BL::ParticleSettings::render_type_OBJECT
 109                 || render_type == BL::ParticleSettings::render_type_GROUP);
 110         #endif
 111
 112         return true;
 113 }
 114
 115 static bool use_particle(BL::Particle b_pa)
 116 {
 117         return b_pa.is_exist() && b_pa.is_visible() && b_pa.alive_state()==BL::Particle::alive_state_ALIVE;
 118 }
 119
 120 int BlenderSync::object_count_particles(BL::Object b_ob)
 121 {
 122         int tot = 0;
 123         BL::Object::particle_systems_iterator b_psys;
 124         for(b_ob.particle_systems.begin(b_psys); b_psys != b_ob.particle_systems.end(); ++b_psys) {
 125                 if (use_particle_system(*b_psys)) {
 126                         BL::ParticleSystem::particles_iterator b_pa;
 127                         for(b_psys->particles.begin(b_pa); b_pa != b_psys->particles.end(); ++b_pa) {
 128                                 if(use_particle(*b_pa))
 129                                         ++tot;
 130                         }
 131                 }
 132         }
 133         return tot;
 134 }
 135
 136 void BlenderSync::sync_particles(Object *ob, BL::Object b_ob)
 137 {
 138         int tot = object_count_particles(b_ob);
 139
 140         ob->particles.clear();
 141         ob->particles.reserve(tot);
 142
 143         int index;
 144         BL::Object::particle_systems_iterator b_psys;
 145         for(b_ob.particle_systems.begin(b_psys); b_psys != b_ob.particle_systems.end(); ++b_psys) {
 146                 if (use_particle_system(*b_psys)) {
 147                         BL::ParticleSystem::particles_iterator b_pa;
 148                         for(b_psys->particles.begin(b_pa), index = 0; b_pa != b_psys->particles.end(); ++b_pa, ++index) {
 149                                 if(use_particle(*b_pa)) {
 150                                         Particle pa;
 151
 152                                         pa.age = b_scene.frame_current() - b_pa->birth_time();
 153                                         pa.lifetime = b_pa->lifetime();
 154
 155                                         ob->particles.push_back(pa);
 156                                 }
 157                         }
 158                 }
 159         }
 160 }
 161
 162 CCL_NAMESPACE_END