intern/cycles/blender/blender_mesh.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 "mesh.h"
  20 #include "object.h"
  21 #include "scene.h"
  22
  23 #include "blender_sync.h"
  24 #include "blender_util.h"
  25
  26 #include "subd_mesh.h"
  27 #include "subd_patch.h"
  28 #include "subd_split.h"
  29
  30 #include "util_foreach.h"
  31
  32 CCL_NAMESPACE_BEGIN
  33
  34 /* Find/Add */
  35
  36 static bool mesh_need_attribute(Scene *scene, Mesh *mesh, Attribute::Standard std)
  37 {
  38         if(std == Attribute::STD_NONE)
  39                 return false;
  40
  41         foreach(uint shader, mesh->used_shaders)
  42                 if(scene->shaders[shader]->attributes.find(std))
  43                         return true;
  44
  45         return false;
  46 }
  47
  48 static bool mesh_need_attribute(Scene *scene, Mesh *mesh, ustring name)
  49 {
  50         if(name == ustring())
  51                 return false;
  52
  53         foreach(uint shader, mesh->used_shaders)
  54                 if(scene->shaders[shader]->attributes.find(name))
  55                         return true;
  56
  57         return false;
  58 }
  59
  60 static void create_mesh(Scene *scene, Mesh *mesh, BL::Mesh b_mesh, const vector<uint>& used_shaders)
  61 {
  62         /* create vertices */
  63         BL::Mesh::vertices_iterator v;
  64
  65         for(b_mesh.vertices.begin(v); v != b_mesh.vertices.end(); ++v)
  66                 mesh->verts.push_back(get_float3(v->co()));
  67
  68         /* create faces */
  69         BL::Mesh::faces_iterator f;
  70         vector<int> nverts;
  71
  72         for(b_mesh.faces.begin(f); f != b_mesh.faces.end(); ++f) {
  73                 int4 vi = get_int4(f->vertices_raw());
  74                 int n= (vi[3] == 0)? 3: 4;
  75                 int shader = used_shaders[f->material_index()];
  76                 bool smooth = f->use_smooth();
  77
  78                 mesh->add_triangle(vi[0], vi[1], vi[2], shader, smooth);
  79
  80                 if(n == 4)
  81                         mesh->add_triangle(vi[0], vi[2], vi[3], shader, smooth);
  82
  83                 nverts.push_back(n);
  84         }
  85
  86         /* create generated coordinates. todo: we should actually get the orco
  87            coordinates from modifiers, for now we use texspace loc/size which
  88            is available in the api. */
  89         if(mesh_need_attribute(scene, mesh, Attribute::STD_GENERATED)) {
  90                 Attribute *attr = mesh->attributes.add(Attribute::STD_GENERATED);
  91                 float3 loc = get_float3(b_mesh.texspace_location());
  92                 float3 size = get_float3(b_mesh.texspace_size());
  93
  94                 if(size.x != 0.0f) size.x = 0.5f/size.x;
  95                 if(size.y != 0.0f) size.y = 0.5f/size.y;
  96                 if(size.z != 0.0f) size.z = 0.5f/size.z;
  97
  98                 loc = loc*size - make_float3(0.5f, 0.5f, 0.5f);
  99
 100                 float3 *fdata = attr->data_float3();
 101                 BL::Mesh::vertices_iterator v;
 102                 size_t i = 0;
 103
 104                 for(b_mesh.vertices.begin(v); v != b_mesh.vertices.end(); ++v)
 105                         fdata[i++] = get_float3(v->co())*size - loc;
 106         }
 107
 108         /* create vertex color attributes */
 109         {
 110                 BL::Mesh::vertex_colors_iterator l;
 111
 112                 for(b_mesh.vertex_colors.begin(l); l != b_mesh.vertex_colors.end(); ++l) {
 113                         if(!mesh_need_attribute(scene, mesh, ustring(l->name())))
 114                                 continue;
 115
 116                         Attribute *attr = mesh->attributes.add(
 117                                 ustring(l->name()), TypeDesc::TypeColor, Attribute::CORNER);
 118
 119                         BL::MeshColorLayer::data_iterator c;
 120                         float3 *fdata = attr->data_float3();
 121                         size_t i = 0;
 122
 123                         for(l->data.begin(c); c != l->data.end(); ++c, ++i) {
 124                                 fdata[0] =  get_float3(c->color1());
 125                                 fdata[1] =  get_float3(c->color2());
 126                                 fdata[2] =  get_float3(c->color3());
 127                                 fdata += 3;
 128
 129                                 if(nverts[i] == 4) {
 130                                         fdata[0] =  get_float3(c->color1());
 131                                         fdata[1] =  get_float3(c->color3());
 132                                         fdata[2] =  get_float3(c->color4());
 133                                         fdata += 3;
 134                                 }
 135                         }
 136                 }
 137         }
 138
 139         /* create uv layer attributes */
 140         {
 141                 BL::Mesh::uv_textures_iterator l;
 142
 143                 for(b_mesh.uv_textures.begin(l); l != b_mesh.uv_textures.end(); ++l) {
 144                         Attribute::Standard std = (l->active_render())? Attribute::STD_UV: Attribute::STD_NONE;
 145                         ustring name = ustring(l->name());
 146
 147                         if(!(mesh_need_attribute(scene, mesh, name) || mesh_need_attribute(scene, mesh, std)))
 148                                 continue;
 149
 150                         Attribute *attr;
 151
 152                         if(l->active_render())
 153                                 attr = mesh->attributes.add(std, name);
 154                         else
 155                                 attr = mesh->attributes.add(name, TypeDesc::TypePoint, Attribute::CORNER);
 156
 157                         BL::MeshTextureFaceLayer::data_iterator t;
 158                         float3 *fdata = attr->data_float3();
 159                         size_t i = 0;
 160
 161                         for(l->data.begin(t); t != l->data.end(); ++t, ++i) {
 162                                 fdata[0] =  get_float3(t->uv1());
 163                                 fdata[1] =  get_float3(t->uv2());
 164                                 fdata[2] =  get_float3(t->uv3());
 165                                 fdata += 3;
 166
 167                                 if(nverts[i] == 4) {
 168                                         fdata[0] =  get_float3(t->uv1());
 169                                         fdata[1] =  get_float3(t->uv3());
 170                                         fdata[2] =  get_float3(t->uv4());
 171                                         fdata += 3;
 172                                 }
 173                         }
 174                 }
 175         }
 176 }
 177
 178 static void create_subd_mesh(Mesh *mesh, BL::Mesh b_mesh, PointerRNA *cmesh, const vector<uint>& used_shaders)
 179 {
 180         /* create subd mesh */
 181         SubdMesh sdmesh;
 182
 183         /* create vertices */
 184         BL::Mesh::vertices_iterator v;
 185
 186         for(b_mesh.vertices.begin(v); v != b_mesh.vertices.end(); ++v)
 187                 sdmesh.add_vert(get_float3(v->co()));
 188
 189         /* create faces */
 190         BL::Mesh::faces_iterator f;
 191
 192         for(b_mesh.faces.begin(f); f != b_mesh.faces.end(); ++f) {
 193                 int4 vi = get_int4(f->vertices_raw());
 194                 int n= (vi[3] == 0)? 3: 4;
 195                 //int shader = used_shaders[f->material_index()];
 196
 197                 if(n == 4)
 198                         sdmesh.add_face(vi[0], vi[1], vi[2], vi[3]);
 199                 /*else
 200                         sdmesh.add_face(vi[0], vi[1], vi[2]);*/
 201         }
 202
 203         /* finalize subd mesh */
 204         sdmesh.link_boundary();
 205
 206         /* subdivide */
 207         DiagSplit dsplit;
 208         dsplit.camera = NULL;
 209         dsplit.dicing_rate = RNA_float_get(cmesh, "dicing_rate");
 210
 211         sdmesh.tesselate(&dsplit, false, mesh, used_shaders[0], true);
 212 }
 213
 214 /* Sync */
 215
 216 Mesh *BlenderSync::sync_mesh(BL::Object b_ob, bool object_updated)
 217 {
 218         /* test if we can instance or if the object is modified */
 219         BL::ID b_ob_data = b_ob.data();
 220         BL::ID key = (object_is_modified(b_ob))? b_ob: b_ob_data;
 221
 222         /* find shader indices */
 223         vector<uint> used_shaders;
 224
 225         BL::Object::material_slots_iterator slot;
 226         for(b_ob.material_slots.begin(slot); slot != b_ob.material_slots.end(); ++slot) {
 227                 if(render_layer.material_override)
 228                         find_shader(render_layer.material_override, used_shaders);
 229                 else
 230                         find_shader(slot->material(), used_shaders);
 231         }
 232
 233         if(used_shaders.size() == 0)
 234                 used_shaders.push_back(scene->default_surface);
 235
 236         /* test if we need to sync */
 237         Mesh *mesh;
 238
 239         if(!mesh_map.sync(&mesh, key)) {
 240                 /* if transform was applied to mesh, need full update */
 241                 if(object_updated && mesh->transform_applied);
 242                 /* test if shaders changed, these can be object level so mesh
 243                    does not get tagged for recalc */
 244                 else if(mesh->used_shaders != used_shaders);
 245                 else {
 246                         /* even if not tagged for recalc, we may need to sync anyway
 247                          * because the shader needs different mesh attributes */
 248                         bool attribute_recalc = false;
 249
 250                         foreach(uint shader, mesh->used_shaders)
 251                                 if(scene->shaders[shader]->need_update_attributes)
 252                                         attribute_recalc = true;
 253
 254                         if(!attribute_recalc)
 255                                 return mesh;
 256                 }
 257         }
 258
 259         /* ensure we only sync instanced meshes once */
 260         if(mesh_synced.find(mesh) != mesh_synced.end())
 261                 return mesh;
 262
 263         mesh_synced.insert(mesh);
 264
 265         /* create derived mesh */
 266         BL::Mesh b_mesh = object_to_mesh(b_ob, b_scene, true, !preview);
 267         PointerRNA cmesh = RNA_pointer_get(&b_ob_data.ptr, "cycles");
 268
 269         vector<Mesh::Triangle> oldtriangle = mesh->triangles;
 270
 271
 272         mesh->clear();
 273         mesh->used_shaders = used_shaders;
 274         mesh->name = ustring(b_ob_data.name().c_str());
 275
 276         if(b_mesh) {
 277                 if(cmesh.data && RNA_boolean_get(&cmesh, "use_subdivision"))
 278                         create_subd_mesh(mesh, b_mesh, &cmesh, used_shaders);
 279                 else
 280                         create_mesh(scene, mesh, b_mesh, used_shaders);
 281
 282                 /* free derived mesh */
 283                 object_remove_mesh(b_data, b_mesh);
 284         }
 285
 286         /* displacement method */
 287         if(cmesh.data) {
 288                 int method = RNA_enum_get(&cmesh, "displacement_method");
 289
 290                 if(method == 0)
 291                         mesh->displacement_method = Mesh::DISPLACE_BUMP;
 292                 else if(method == 1)
 293                         mesh->displacement_method = Mesh::DISPLACE_TRUE;
 294                 else
 295                         mesh->displacement_method = Mesh::DISPLACE_BOTH;
 296         }
 297
 298         /* tag update */
 299         bool rebuild = false;
 300
 301         if(oldtriangle.size() != mesh->triangles.size())
 302                 rebuild = true;
 303         else if(oldtriangle.size()) {
 304                 if(memcmp(&oldtriangle[0], &mesh->triangles[0], sizeof(Mesh::Triangle)*oldtriangle.size()) != 0)
 305                         rebuild = true;
 306         }
 307
 308         mesh->tag_update(scene, rebuild);
 309
 310         return mesh;
 311 }
 312
 313 CCL_NAMESPACE_END
 314