src/mesh.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "mesh.h"
  21 #include "debug.h"
  22 #include "log.h"
  23 #include "irrMap.h"
  24 #include <iostream>
  25 #include <IAnimatedMesh.h>
  26 #include <SAnimatedMesh.h>
  27
  28 // In Irrlicht 1.8 the signature of ITexture::lock was changed from
  29 // (bool, u32) to (E_TEXTURE_LOCK_MODE, u32).
  30 #if IRRLICHT_VERSION_MAJOR == 1 && IRRLICHT_VERSION_MINOR <= 7
  31 #define MY_ETLM_READ_ONLY true
  32 #else
  33 #define MY_ETLM_READ_ONLY video::ETLM_READ_ONLY
  34 #endif
  35
  36 static void applyFacesShading(video::SColor& color, float factor)
  37 {
  38         color.setRed(core::clamp(core::round32(color.getRed()*factor), 0, 255));
  39         color.setGreen(core::clamp(core::round32(color.getGreen()*factor), 0, 255));
  40         color.setBlue(core::clamp(core::round32(color.getBlue()*factor), 0, 255));
  41 }
  42
  43 scene::IAnimatedMesh* createCubeMesh(v3f scale)
  44 {
  45         video::SColor c(255,255,255,255);
  46         video::S3DVertex vertices[24] =
  47         {
  48                 // Up
  49                 video::S3DVertex(-0.5,+0.5,-0.5, 0,1,0, c, 0,1),
  50                 video::S3DVertex(-0.5,+0.5,+0.5, 0,1,0, c, 0,0),
  51                 video::S3DVertex(+0.5,+0.5,+0.5, 0,1,0, c, 1,0),
  52                 video::S3DVertex(+0.5,+0.5,-0.5, 0,1,0, c, 1,1),
  53                 // Down
  54                 video::S3DVertex(-0.5,-0.5,-0.5, 0,-1,0, c, 0,0),
  55                 video::S3DVertex(+0.5,-0.5,-0.5, 0,-1,0, c, 1,0),
  56                 video::S3DVertex(+0.5,-0.5,+0.5, 0,-1,0, c, 1,1),
  57                 video::S3DVertex(-0.5,-0.5,+0.5, 0,-1,0, c, 0,1),
  58                 // Right
  59                 video::S3DVertex(+0.5,-0.5,-0.5, 1,0,0, c, 0,1),
  60                 video::S3DVertex(+0.5,+0.5,-0.5, 1,0,0, c, 0,0),
  61                 video::S3DVertex(+0.5,+0.5,+0.5, 1,0,0, c, 1,0),
  62                 video::S3DVertex(+0.5,-0.5,+0.5, 1,0,0, c, 1,1),
  63                 // Left
  64                 video::S3DVertex(-0.5,-0.5,-0.5, -1,0,0, c, 1,1),
  65                 video::S3DVertex(-0.5,-0.5,+0.5, -1,0,0, c, 0,1),
  66                 video::S3DVertex(-0.5,+0.5,+0.5, -1,0,0, c, 0,0),
  67                 video::S3DVertex(-0.5,+0.5,-0.5, -1,0,0, c, 1,0),
  68                 // Back
  69                 video::S3DVertex(-0.5,-0.5,+0.5, 0,0,1, c, 1,1),
  70                 video::S3DVertex(+0.5,-0.5,+0.5, 0,0,1, c, 0,1),
  71                 video::S3DVertex(+0.5,+0.5,+0.5, 0,0,1, c, 0,0),
  72                 video::S3DVertex(-0.5,+0.5,+0.5, 0,0,1, c, 1,0),
  73                 // Front
  74                 video::S3DVertex(-0.5,-0.5,-0.5, 0,0,-1, c, 0,1),
  75                 video::S3DVertex(-0.5,+0.5,-0.5, 0,0,-1, c, 0,0),
  76                 video::S3DVertex(+0.5,+0.5,-0.5, 0,0,-1, c, 1,0),
  77                 video::S3DVertex(+0.5,-0.5,-0.5, 0,0,-1, c, 1,1),
  78         };
  79
  80         u16 indices[6] = {0,1,2,2,3,0};
  81
  82         scene::SMesh *mesh = new scene::SMesh();
  83         for (u32 i=0; i<6; ++i)
  84         {
  85                 scene::IMeshBuffer *buf = new scene::SMeshBuffer();
  86                 buf->append(vertices + 4 * i, 4, indices, 6);
  87                 // Set default material
  88                 buf->getMaterial().setFlag(video::EMF_LIGHTING, false);
  89                 buf->getMaterial().setFlag(video::EMF_BILINEAR_FILTER, false);
  90                 buf->getMaterial().MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
  91                 // Add mesh buffer to mesh
  92                 mesh->addMeshBuffer(buf);
  93                 buf->drop();
  94         }
  95
  96         scene::SAnimatedMesh *anim_mesh = new scene::SAnimatedMesh(mesh);
  97         mesh->drop();
  98         scaleMesh(anim_mesh, scale);  // also recalculates bounding box
  99         return anim_mesh;
 100 }
 101
 102 void scaleMesh(scene::IMesh *mesh, v3f scale)
 103 {
 104         if (mesh == NULL)
 105                 return;
 106
 107         aabb3f bbox;
 108         bbox.reset(0, 0, 0);
 109
 110         u32 mc = mesh->getMeshBufferCount();
 111         for (u32 j = 0; j < mc; j++) {
 112                 scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
 113                 const u32 stride = getVertexPitchFromType(buf->getVertexType());
 114                 u32 vertex_count = buf->getVertexCount();
 115                 u8 *vertices = (u8 *)buf->getVertices();
 116                 for (u32 i = 0; i < vertex_count; i++)
 117                         ((video::S3DVertex *)(vertices + i * stride))->Pos *= scale;
 118
 119                 buf->recalculateBoundingBox();
 120
 121                 // calculate total bounding box
 122                 if (j == 0)
 123                         bbox = buf->getBoundingBox();
 124                 else
 125                         bbox.addInternalBox(buf->getBoundingBox());
 126         }
 127         mesh->setBoundingBox(bbox);
 128 }
 129
 130 void translateMesh(scene::IMesh *mesh, v3f vec)
 131 {
 132         if (mesh == NULL)
 133                 return;
 134
 135         aabb3f bbox;
 136         bbox.reset(0, 0, 0);
 137
 138         u32 mc = mesh->getMeshBufferCount();
 139         for (u32 j = 0; j < mc; j++) {
 140                 scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
 141                 const u32 stride = getVertexPitchFromType(buf->getVertexType());
 142                 u32 vertex_count = buf->getVertexCount();
 143                 u8 *vertices = (u8 *)buf->getVertices();
 144                 for (u32 i = 0; i < vertex_count; i++)
 145                         ((video::S3DVertex *)(vertices + i * stride))->Pos += vec;
 146
 147                 buf->recalculateBoundingBox();
 148
 149                 // calculate total bounding box
 150                 if (j == 0)
 151                         bbox = buf->getBoundingBox();
 152                 else
 153                         bbox.addInternalBox(buf->getBoundingBox());
 154         }
 155         mesh->setBoundingBox(bbox);
 156 }
 157
 158
 159 void setMeshColor(scene::IMesh *mesh, const video::SColor &color)
 160 {
 161         if (mesh == NULL)
 162                 return;
 163
 164         u32 mc = mesh->getMeshBufferCount();
 165         for (u32 j = 0; j < mc; j++) {
 166                 scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
 167                 const u32 stride = getVertexPitchFromType(buf->getVertexType());
 168                 u32 vertex_count = buf->getVertexCount();
 169                 u8 *vertices = (u8 *)buf->getVertices();
 170                 for (u32 i = 0; i < vertex_count; i++)
 171                         ((video::S3DVertex *)(vertices + i * stride))->Color = color;
 172         }
 173 }
 174
 175 void shadeMeshFaces(scene::IMesh *mesh)
 176 {
 177         if (mesh == NULL)
 178                 return;
 179
 180         u32 mc = mesh->getMeshBufferCount();
 181         for (u32 j = 0; j < mc; j++) {
 182                 scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
 183                 const u32 stride = getVertexPitchFromType(buf->getVertexType());
 184                 u32 vertex_count = buf->getVertexCount();
 185                 u8 *vertices = (u8 *)buf->getVertices();
 186                 for (u32 i = 0; i < vertex_count; i++) {
 187                         video::S3DVertex *vertex = (video::S3DVertex *)(vertices + i * stride);
 188                         video::SColor &vc = vertex->Color;
 189                         if (vertex->Normal.Y < -0.5) {
 190                                 applyFacesShading (vc, 0.447213);
 191                         } else if (vertex->Normal.Z > 0.5) {
 192                                 applyFacesShading (vc, 0.670820);
 193                         } else if (vertex->Normal.Z < -0.5) {
 194                                 applyFacesShading (vc, 0.670820);
 195                         } else if (vertex->Normal.X > 0.5) {
 196                                 applyFacesShading (vc, 0.836660);
 197                         } else if (vertex->Normal.X < -0.5) {
 198                                 applyFacesShading (vc, 0.836660);
 199                         }
 200                 }
 201         }
 202 }
 203
 204 void setMeshColorByNormalXYZ(scene::IMesh *mesh,
 205                 const video::SColor &colorX,
 206                 const video::SColor &colorY,
 207                 const video::SColor &colorZ)
 208 {
 209         if (mesh == NULL)
 210                 return;
 211
 212         u16 mc = mesh->getMeshBufferCount();
 213         for (u16 j = 0; j < mc; j++) {
 214                 scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
 215                 const u32 stride = getVertexPitchFromType(buf->getVertexType());
 216                 u32 vertex_count = buf->getVertexCount();
 217                 u8 *vertices = (u8 *)buf->getVertices();
 218                 for (u32 i = 0; i < vertex_count; i++) {
 219                         video::S3DVertex *vertex = (video::S3DVertex *)(vertices + i * stride);
 220                         f32 x = fabs(vertex->Normal.X);
 221                         f32 y = fabs(vertex->Normal.Y);
 222                         f32 z = fabs(vertex->Normal.Z);
 223                         if (x >= y && x >= z)
 224                                 vertex->Color = colorX;
 225                         else if (y >= z)
 226                                 vertex->Color = colorY;
 227                         else
 228                                 vertex->Color = colorZ;
 229
 230                 }
 231         }
 232 }
 233
 234 void rotateMeshXYby(scene::IMesh *mesh, f64 degrees)
 235 {
 236         u16 mc = mesh->getMeshBufferCount();
 237         for (u16 j = 0; j < mc; j++) {
 238                 scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
 239                 const u32 stride = getVertexPitchFromType(buf->getVertexType());
 240                 u32 vertex_count = buf->getVertexCount();
 241                 u8 *vertices = (u8 *)buf->getVertices();
 242                 for (u32 i = 0; i < vertex_count; i++)
 243                         ((video::S3DVertex *)(vertices + i * stride))->Pos.rotateXYBy(degrees);
 244         }
 245 }
 246
 247 void rotateMeshXZby(scene::IMesh *mesh, f64 degrees)
 248 {
 249         u16 mc = mesh->getMeshBufferCount();
 250         for (u16 j = 0; j < mc; j++) {
 251                 scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
 252                 const u32 stride = getVertexPitchFromType(buf->getVertexType());
 253                 u32 vertex_count = buf->getVertexCount();
 254                 u8 *vertices = (u8 *)buf->getVertices();
 255                 for (u32 i = 0; i < vertex_count; i++)
 256                         ((video::S3DVertex *)(vertices + i * stride))->Pos.rotateXZBy(degrees);
 257         }
 258 }
 259
 260 void rotateMeshYZby(scene::IMesh *mesh, f64 degrees)
 261 {
 262         u16 mc = mesh->getMeshBufferCount();
 263         for (u16 j = 0; j < mc; j++) {
 264                 scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
 265                 const u32 stride = getVertexPitchFromType(buf->getVertexType());
 266                 u32 vertex_count = buf->getVertexCount();
 267                 u8 *vertices = (u8 *)buf->getVertices();
 268                 for (u32 i = 0; i < vertex_count; i++)
 269                         ((video::S3DVertex *)(vertices + i * stride))->Pos.rotateYZBy(degrees);
 270         }
 271 }
 272
 273 void rotateMeshBy6dFacedir(scene::IMesh *mesh, int facedir)
 274 {
 275         int axisdir = facedir >> 2;
 276         facedir &= 0x03;
 277
 278         u16 mc = mesh->getMeshBufferCount();
 279         for (u16 j = 0; j < mc; j++) {
 280                 scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
 281                 const u32 stride = getVertexPitchFromType(buf->getVertexType());
 282                 u32 vertex_count = buf->getVertexCount();
 283                 u8 *vertices = (u8 *)buf->getVertices();
 284                 for (u32 i = 0; i < vertex_count; i++) {
 285                         video::S3DVertex *vertex = (video::S3DVertex *)(vertices + i * stride);
 286                         switch (axisdir) {
 287                                 case 0:
 288                                         if (facedir == 1)
 289                                                 vertex->Pos.rotateXZBy(-90);
 290                                         else if (facedir == 2)
 291                                                 vertex->Pos.rotateXZBy(180);
 292                                         else if (facedir == 3)
 293                                                 vertex->Pos.rotateXZBy(90);
 294                                         break;
 295                                 case 1: // z+
 296                                         vertex->Pos.rotateYZBy(90);
 297                                         if (facedir == 1)
 298                                                 vertex->Pos.rotateXYBy(90);
 299                                         else if (facedir == 2)
 300                                                 vertex->Pos.rotateXYBy(180);
 301                                         else if (facedir == 3)
 302                                                 vertex->Pos.rotateXYBy(-90);
 303                                         break;
 304                                 case 2: //z-
 305                                         vertex->Pos.rotateYZBy(-90);
 306                                         if (facedir == 1)
 307                                                 vertex->Pos.rotateXYBy(-90);
 308                                         else if (facedir == 2)
 309                                                 vertex->Pos.rotateXYBy(180);
 310                                         else if (facedir == 3)
 311                                                 vertex->Pos.rotateXYBy(90);
 312                                         break;
 313                                 case 3:  //x+
 314                                         vertex->Pos.rotateXYBy(-90);
 315                                         if (facedir == 1)
 316                                                 vertex->Pos.rotateYZBy(90);
 317                                         else if (facedir == 2)
 318                                                 vertex->Pos.rotateYZBy(180);
 319                                         else if (facedir == 3)
 320                                                 vertex->Pos.rotateYZBy(-90);
 321                                         break;
 322                                 case 4:  //x-
 323                                         vertex->Pos.rotateXYBy(90);
 324                                         if (facedir == 1)
 325                                                 vertex->Pos.rotateYZBy(-90);
 326                                         else if (facedir == 2)
 327                                                 vertex->Pos.rotateYZBy(180);
 328                                         else if (facedir == 3)
 329                                                 vertex->Pos.rotateYZBy(90);
 330                                         break;
 331                                 case 5:
 332                                         vertex->Pos.rotateXYBy(-180);
 333                                         if (facedir == 1)
 334                                                 vertex->Pos.rotateXZBy(90);
 335                                         else if (facedir == 2)
 336                                                 vertex->Pos.rotateXZBy(180);
 337                                         else if (facedir == 3)
 338                                                 vertex->Pos.rotateXZBy(-90);
 339                                         break;
 340                                 default:
 341                                         break;
 342                         }
 343                 }
 344         }
 345 }
 346
 347 void recalculateBoundingBox(scene::IMesh *src_mesh)
 348 {
 349         aabb3f bbox;
 350         bbox.reset(0,0,0);
 351         for (u16 j = 0; j < src_mesh->getMeshBufferCount(); j++) {
 352                 scene::IMeshBuffer *buf = src_mesh->getMeshBuffer(j);
 353                 buf->recalculateBoundingBox();
 354                 if (j == 0)
 355                         bbox = buf->getBoundingBox();
 356                 else
 357                         bbox.addInternalBox(buf->getBoundingBox());
 358         }
 359         src_mesh->setBoundingBox(bbox);
 360 }
 361
 362 scene::IMesh* cloneMesh(scene::IMesh *src_mesh)
 363 {
 364         scene::SMesh* dst_mesh = new scene::SMesh();
 365         for (u16 j = 0; j < src_mesh->getMeshBufferCount(); j++) {
 366                 scene::IMeshBuffer *buf = src_mesh->getMeshBuffer(j);
 367                 switch (buf->getVertexType()) {
 368                         case video::EVT_STANDARD: {
 369                                 video::S3DVertex *v =
 370                                         (video::S3DVertex *) buf->getVertices();
 371                                 u16 *indices = (u16*)buf->getIndices();
 372                                 scene::SMeshBuffer *temp_buf = new scene::SMeshBuffer();
 373                                 temp_buf->append(v, buf->getVertexCount(),
 374                                         indices, buf->getIndexCount());
 375                                 dst_mesh->addMeshBuffer(temp_buf);
 376                                 temp_buf->drop();
 377                                 break;
 378                         }
 379                         case video::EVT_2TCOORDS: {
 380                                 video::S3DVertex2TCoords *v =
 381                                         (video::S3DVertex2TCoords *) buf->getVertices();
 382                                 u16 *indices = (u16*)buf->getIndices();
 383                                 scene::SMeshBufferTangents *temp_buf =
 384                                         new scene::SMeshBufferTangents();
 385                                 temp_buf->append(v, buf->getVertexCount(),
 386                                         indices, buf->getIndexCount());
 387                                 dst_mesh->addMeshBuffer(temp_buf);
 388                                 temp_buf->drop();
 389                                 break;
 390                         }
 391                         case video::EVT_TANGENTS: {
 392                                 video::S3DVertexTangents *v =
 393                                         (video::S3DVertexTangents *) buf->getVertices();
 394                                 u16 *indices = (u16*)buf->getIndices();
 395                                 scene::SMeshBufferTangents *temp_buf =
 396                                         new scene::SMeshBufferTangents();
 397                                 temp_buf->append(v, buf->getVertexCount(),
 398                                         indices, buf->getIndexCount());
 399                                 dst_mesh->addMeshBuffer(temp_buf);
 400                                 temp_buf->drop();
 401                                 break;
 402                         }
 403                 }
 404         }
 405         return dst_mesh;
 406 }
 407
 408 scene::IMesh* convertNodeboxesToMesh(const std::vector<aabb3f> &boxes,
 409                 const f32 *uv_coords, float expand)
 410 {
 411         scene::SMesh* dst_mesh = new scene::SMesh();
 412
 413         for (u16 j = 0; j < 6; j++)
 414         {
 415                 scene::IMeshBuffer *buf = new scene::SMeshBuffer();
 416                 buf->getMaterial().setFlag(video::EMF_LIGHTING, false);
 417                 buf->getMaterial().setFlag(video::EMF_BILINEAR_FILTER, false);
 418                 dst_mesh->addMeshBuffer(buf);
 419                 buf->drop();
 420         }
 421
 422         video::SColor c(255,255,255,255);
 423
 424         for (std::vector<aabb3f>::const_iterator
 425                         i = boxes.begin();
 426                         i != boxes.end(); ++i)
 427         {
 428                 aabb3f box = *i;
 429                 box.repair();
 430
 431                 box.MinEdge.X -= expand;
 432                 box.MinEdge.Y -= expand;
 433                 box.MinEdge.Z -= expand;
 434                 box.MaxEdge.X += expand;
 435                 box.MaxEdge.Y += expand;
 436                 box.MaxEdge.Z += expand;
 437
 438                 // Compute texture UV coords
 439                 f32 tx1 = (box.MinEdge.X / BS) + 0.5;
 440                 f32 ty1 = (box.MinEdge.Y / BS) + 0.5;
 441                 f32 tz1 = (box.MinEdge.Z / BS) + 0.5;
 442                 f32 tx2 = (box.MaxEdge.X / BS) + 0.5;
 443                 f32 ty2 = (box.MaxEdge.Y / BS) + 0.5;
 444                 f32 tz2 = (box.MaxEdge.Z / BS) + 0.5;
 445
 446                 f32 txc_default[24] = {
 447                         // up
 448                         tx1, 1 - tz2, tx2, 1 - tz1,
 449                         // down
 450                         tx1, tz1, tx2, tz2,
 451                         // right
 452                         tz1, 1 - ty2, tz2, 1 - ty1,
 453                         // left
 454                         1 - tz2, 1 - ty2, 1 - tz1, 1 - ty1,
 455                         // back
 456                         1 - tx2, 1 - ty2, 1 - tx1, 1 - ty1,
 457                         // front
 458                         tx1, 1 - ty2, tx2, 1 - ty1,
 459                 };
 460
 461                 // use default texture UV mapping if not provided
 462                 const f32 *txc = uv_coords ? uv_coords : txc_default;
 463
 464                 v3f min = box.MinEdge;
 465                 v3f max = box.MaxEdge;
 466
 467                 video::S3DVertex vertices[24] =
 468                 {
 469                         // up
 470                         video::S3DVertex(min.X,max.Y,max.Z, 0,1,0, c, txc[0],txc[1]),
 471                         video::S3DVertex(max.X,max.Y,max.Z, 0,1,0, c, txc[2],txc[1]),
 472                         video::S3DVertex(max.X,max.Y,min.Z, 0,1,0, c, txc[2],txc[3]),
 473                         video::S3DVertex(min.X,max.Y,min.Z, 0,1,0, c, txc[0],txc[3]),
 474                         // down
 475                         video::S3DVertex(min.X,min.Y,min.Z, 0,-1,0, c, txc[4],txc[5]),
 476                         video::S3DVertex(max.X,min.Y,min.Z, 0,-1,0, c, txc[6],txc[5]),
 477                         video::S3DVertex(max.X,min.Y,max.Z, 0,-1,0, c, txc[6],txc[7]),
 478                         video::S3DVertex(min.X,min.Y,max.Z, 0,-1,0, c, txc[4],txc[7]),
 479                         // right
 480                         video::S3DVertex(max.X,max.Y,min.Z, 1,0,0, c, txc[ 8],txc[9]),
 481                         video::S3DVertex(max.X,max.Y,max.Z, 1,0,0, c, txc[10],txc[9]),
 482                         video::S3DVertex(max.X,min.Y,max.Z, 1,0,0, c, txc[10],txc[11]),
 483                         video::S3DVertex(max.X,min.Y,min.Z, 1,0,0, c, txc[ 8],txc[11]),
 484                         // left
 485                         video::S3DVertex(min.X,max.Y,max.Z, -1,0,0, c, txc[12],txc[13]),
 486                         video::S3DVertex(min.X,max.Y,min.Z, -1,0,0, c, txc[14],txc[13]),
 487                         video::S3DVertex(min.X,min.Y,min.Z, -1,0,0, c, txc[14],txc[15]),
 488                         video::S3DVertex(min.X,min.Y,max.Z, -1,0,0, c, txc[12],txc[15]),
 489                         // back
 490                         video::S3DVertex(max.X,max.Y,max.Z, 0,0,1, c, txc[16],txc[17]),
 491                         video::S3DVertex(min.X,max.Y,max.Z, 0,0,1, c, txc[18],txc[17]),
 492                         video::S3DVertex(min.X,min.Y,max.Z, 0,0,1, c, txc[18],txc[19]),
 493                         video::S3DVertex(max.X,min.Y,max.Z, 0,0,1, c, txc[16],txc[19]),
 494                         // front
 495                         video::S3DVertex(min.X,max.Y,min.Z, 0,0,-1, c, txc[20],txc[21]),
 496                         video::S3DVertex(max.X,max.Y,min.Z, 0,0,-1, c, txc[22],txc[21]),
 497                         video::S3DVertex(max.X,min.Y,min.Z, 0,0,-1, c, txc[22],txc[23]),
 498                         video::S3DVertex(min.X,min.Y,min.Z, 0,0,-1, c, txc[20],txc[23]),
 499                 };
 500
 501                 u16 indices[] = {0,1,2,2,3,0};
 502
 503                 for(u16 j = 0; j < 24; j += 4)
 504                 {
 505                         scene::IMeshBuffer *buf = dst_mesh->getMeshBuffer(j / 4);
 506                         buf->append(vertices + j, 4, indices, 6);
 507                 }
 508         }
 509         return dst_mesh;
 510 }
 511
 512 struct vcache
 513 {
 514         core::array<u32> tris;
 515         float score;
 516         s16 cachepos;
 517         u16 NumActiveTris;
 518 };
 519
 520 struct tcache
 521 {
 522         u16 ind[3];
 523         float score;
 524         bool drawn;
 525 };
 526
 527 const u16 cachesize = 32;
 528
 529 float FindVertexScore(vcache *v)
 530 {
 531         const float CacheDecayPower = 1.5f;
 532         const float LastTriScore = 0.75f;
 533         const float ValenceBoostScale = 2.0f;
 534         const float ValenceBoostPower = 0.5f;
 535         const float MaxSizeVertexCache = 32.0f;
 536
 537         if (v->NumActiveTris == 0)
 538         {
 539                 // No tri needs this vertex!
 540                 return -1.0f;
 541         }
 542
 543         float Score = 0.0f;
 544         int CachePosition = v->cachepos;
 545         if (CachePosition < 0)
 546         {
 547                 // Vertex is not in FIFO cache - no score.
 548         }
 549         else
 550         {
 551                 if (CachePosition < 3)
 552                 {
 553                         // This vertex was used in the last triangle,
 554                         // so it has a fixed score.
 555                         Score = LastTriScore;
 556                 }
 557                 else
 558                 {
 559                         // Points for being high in the cache.
 560                         const float Scaler = 1.0f / (MaxSizeVertexCache - 3);
 561                         Score = 1.0f - (CachePosition - 3) * Scaler;
 562                         Score = powf(Score, CacheDecayPower);
 563                 }
 564         }
 565
 566         // Bonus points for having a low number of tris still to
 567         // use the vert, so we get rid of lone verts quickly.
 568         float ValenceBoost = powf(v->NumActiveTris,
 569                                 -ValenceBoostPower);
 570         Score += ValenceBoostScale * ValenceBoost;
 571
 572         return Score;
 573 }
 574
 575 /*
 576         A specialized LRU cache for the Forsyth algorithm.
 577 */
 578
 579 class f_lru
 580 {
 581
 582 public:
 583         f_lru(vcache *v, tcache *t): vc(v), tc(t)
 584         {
 585                 for (u16 i = 0; i < cachesize; i++)
 586                 {
 587                         cache[i] = -1;
 588                 }
 589         }
 590
 591         // Adds this vertex index and returns the highest-scoring triangle index
 592         u32 add(u16 vert, bool updatetris = false)
 593         {
 594                 bool found = false;
 595
 596                 // Mark existing pos as empty
 597                 for (u16 i = 0; i < cachesize; i++)
 598                 {
 599                         if (cache[i] == vert)
 600                         {
 601                                 // Move everything down
 602                                 for (u16 j = i; j; j--)
 603                                 {
 604                                         cache[j] = cache[j - 1];
 605                                 }
 606
 607                                 found = true;
 608                                 break;
 609                         }
 610                 }
 611
 612                 if (!found)
 613                 {
 614                         if (cache[cachesize-1] != -1)
 615                                 vc[cache[cachesize-1]].cachepos = -1;
 616
 617                         // Move everything down
 618                         for (u16 i = cachesize - 1; i; i--)
 619                         {
 620                                 cache[i] = cache[i - 1];
 621                         }
 622                 }
 623
 624                 cache[0] = vert;
 625
 626                 u32 highest = 0;
 627                 float hiscore = 0;
 628
 629                 if (updatetris)
 630                 {
 631                         // Update cache positions
 632                         for (u16 i = 0; i < cachesize; i++)
 633                         {
 634                                 if (cache[i] == -1)
 635                                         break;
 636
 637                                 vc[cache[i]].cachepos = i;
 638                                 vc[cache[i]].score = FindVertexScore(&vc[cache[i]]);
 639                         }
 640
 641                         // Update triangle scores
 642                         for (u16 i = 0; i < cachesize; i++)
 643                         {
 644                                 if (cache[i] == -1)
 645                                         break;
 646
 647                                 const u16 trisize = vc[cache[i]].tris.size();
 648                                 for (u16 t = 0; t < trisize; t++)
 649                                 {
 650                                         tcache *tri = &tc[vc[cache[i]].tris[t]];
 651
 652                                         tri->score =
 653                                                 vc[tri->ind[0]].score +
 654                                                 vc[tri->ind[1]].score +
 655                                                 vc[tri->ind[2]].score;
 656
 657                                         if (tri->score > hiscore)
 658                                         {
 659                                                 hiscore = tri->score;
 660                                                 highest = vc[cache[i]].tris[t];
 661                                         }
 662                                 }
 663                         }
 664                 }
 665
 666                 return highest;
 667         }
 668
 669 private:
 670         s32 cache[cachesize];
 671         vcache *vc;
 672         tcache *tc;
 673 };
 674
 675 /**
 676 Vertex cache optimization according to the Forsyth paper:
 677 http://home.comcast.net/~tom_forsyth/papers/fast_vert_cache_opt.html
 678
 679 The function is thread-safe (read: you can optimize several meshes in different threads)
 680
 681 \param mesh Source mesh for the operation.  */
 682 scene::IMesh* createForsythOptimizedMesh(const scene::IMesh *mesh)
 683 {
 684         if (!mesh)
 685                 return 0;
 686
 687         scene::SMesh *newmesh = new scene::SMesh();
 688         newmesh->BoundingBox = mesh->getBoundingBox();
 689
 690         const u32 mbcount = mesh->getMeshBufferCount();
 691
 692         for (u32 b = 0; b < mbcount; ++b)
 693         {
 694                 const scene::IMeshBuffer *mb = mesh->getMeshBuffer(b);
 695
 696                 if (mb->getIndexType() != video::EIT_16BIT)
 697                 {
 698                         //os::Printer::log("Cannot optimize a mesh with 32bit indices", ELL_ERROR);
 699                         newmesh->drop();
 700                         return 0;
 701                 }
 702
 703                 const u32 icount = mb->getIndexCount();
 704                 const u32 tcount = icount / 3;
 705                 const u32 vcount = mb->getVertexCount();
 706                 const u16 *ind = mb->getIndices();
 707
 708                 vcache *vc = new vcache[vcount];
 709                 tcache *tc = new tcache[tcount];
 710
 711                 f_lru lru(vc, tc);
 712
 713                 // init
 714                 for (u16 i = 0; i < vcount; i++)
 715                 {
 716                         vc[i].score = 0;
 717                         vc[i].cachepos = -1;
 718                         vc[i].NumActiveTris = 0;
 719                 }
 720
 721                 // First pass: count how many times a vert is used
 722                 for (u32 i = 0; i < icount; i += 3)
 723                 {
 724                         vc[ind[i]].NumActiveTris++;
 725                         vc[ind[i + 1]].NumActiveTris++;
 726                         vc[ind[i + 2]].NumActiveTris++;
 727
 728                         const u32 tri_ind = i/3;
 729                         tc[tri_ind].ind[0] = ind[i];
 730                         tc[tri_ind].ind[1] = ind[i + 1];
 731                         tc[tri_ind].ind[2] = ind[i + 2];
 732                 }
 733
 734                 // Second pass: list of each triangle
 735                 for (u32 i = 0; i < tcount; i++)
 736                 {
 737                         vc[tc[i].ind[0]].tris.push_back(i);
 738                         vc[tc[i].ind[1]].tris.push_back(i);
 739                         vc[tc[i].ind[2]].tris.push_back(i);
 740
 741                         tc[i].drawn = false;
 742                 }
 743
 744                 // Give initial scores
 745                 for (u16 i = 0; i < vcount; i++)
 746                 {
 747                         vc[i].score = FindVertexScore(&vc[i]);
 748                 }
 749                 for (u32 i = 0; i < tcount; i++)
 750                 {
 751                         tc[i].score =
 752                                         vc[tc[i].ind[0]].score +
 753                                         vc[tc[i].ind[1]].score +
 754                                         vc[tc[i].ind[2]].score;
 755                 }
 756
 757                 switch(mb->getVertexType())
 758                 {
 759                         case video::EVT_STANDARD:
 760                         {
 761                                 video::S3DVertex *v = (video::S3DVertex *) mb->getVertices();
 762
 763                                 scene::SMeshBuffer *buf = new scene::SMeshBuffer();
 764                                 buf->Material = mb->getMaterial();
 765
 766                                 buf->Vertices.reallocate(vcount);
 767                                 buf->Indices.reallocate(icount);
 768
 769                                 core::map<const video::S3DVertex, const u16> sind; // search index for fast operation
 770                                 typedef core::map<const video::S3DVertex, const u16>::Node snode;
 771
 772                                 // Main algorithm
 773                                 u32 highest = 0;
 774                                 u32 drawcalls = 0;
 775                                 for (;;)
 776                                 {
 777                                         if (tc[highest].drawn)
 778                                         {
 779                                                 bool found = false;
 780                                                 float hiscore = 0;
 781                                                 for (u32 t = 0; t < tcount; t++)
 782                                                 {
 783                                                         if (!tc[t].drawn)
 784                                                         {
 785                                                                 if (tc[t].score > hiscore)
 786                                                                 {
 787                                                                         highest = t;
 788                                                                         hiscore = tc[t].score;
 789                                                                         found = true;
 790                                                                 }
 791                                                         }
 792                                                 }
 793                                                 if (!found)
 794                                                         break;
 795                                         }
 796
 797                                         // Output the best triangle
 798                                         u16 newind = buf->Vertices.size();
 799
 800                                         snode *s = sind.find(v[tc[highest].ind[0]]);
 801
 802                                         if (!s)
 803                                         {
 804                                                 buf->Vertices.push_back(v[tc[highest].ind[0]]);
 805                                                 buf->Indices.push_back(newind);
 806                                                 sind.insert(v[tc[highest].ind[0]], newind);
 807                                                 newind++;
 808                                         }
 809                                         else
 810                                         {
 811                                                 buf->Indices.push_back(s->getValue());
 812                                         }
 813
 814                                         s = sind.find(v[tc[highest].ind[1]]);
 815
 816                                         if (!s)
 817                                         {
 818                                                 buf->Vertices.push_back(v[tc[highest].ind[1]]);
 819                                                 buf->Indices.push_back(newind);
 820                                                 sind.insert(v[tc[highest].ind[1]], newind);
 821                                                 newind++;
 822                                         }
 823                                         else
 824                                         {
 825                                                 buf->Indices.push_back(s->getValue());
 826                                         }
 827
 828                                         s = sind.find(v[tc[highest].ind[2]]);
 829
 830                                         if (!s)
 831                                         {
 832                                                 buf->Vertices.push_back(v[tc[highest].ind[2]]);
 833                                                 buf->Indices.push_back(newind);
 834                                                 sind.insert(v[tc[highest].ind[2]], newind);
 835                                         }
 836                                         else
 837                                         {
 838                                                 buf->Indices.push_back(s->getValue());
 839                                         }
 840
 841                                         vc[tc[highest].ind[0]].NumActiveTris--;
 842                                         vc[tc[highest].ind[1]].NumActiveTris--;
 843                                         vc[tc[highest].ind[2]].NumActiveTris--;
 844
 845                                         tc[highest].drawn = true;
 846
 847                                         for (u16 j = 0; j < 3; j++)
 848                                         {
 849                                                 vcache *vert = &vc[tc[highest].ind[j]];
 850                                                 for (u16 t = 0; t < vert->tris.size(); t++)
 851                                                 {
 852                                                         if (highest == vert->tris[t])
 853                                                         {
 854                                                                 vert->tris.erase(t);
 855                                                                 break;
 856                                                         }
 857                                                 }
 858                                         }
 859
 860                                         lru.add(tc[highest].ind[0]);
 861                                         lru.add(tc[highest].ind[1]);
 862                                         highest = lru.add(tc[highest].ind[2], true);
 863                                         drawcalls++;
 864                                 }
 865
 866                                 buf->setBoundingBox(mb->getBoundingBox());
 867                                 newmesh->addMeshBuffer(buf);
 868                                 buf->drop();
 869                         }
 870                         break;
 871                         case video::EVT_2TCOORDS:
 872                         {
 873                                 video::S3DVertex2TCoords *v = (video::S3DVertex2TCoords *) mb->getVertices();
 874
 875                                 scene::SMeshBufferLightMap *buf = new scene::SMeshBufferLightMap();
 876                                 buf->Material = mb->getMaterial();
 877
 878                                 buf->Vertices.reallocate(vcount);
 879                                 buf->Indices.reallocate(icount);
 880
 881                                 core::map<const video::S3DVertex2TCoords, const u16> sind; // search index for fast operation
 882                                 typedef core::map<const video::S3DVertex2TCoords, const u16>::Node snode;
 883
 884                                 // Main algorithm
 885                                 u32 highest = 0;
 886                                 u32 drawcalls = 0;
 887                                 for (;;)
 888                                 {
 889                                         if (tc[highest].drawn)
 890                                         {
 891                                                 bool found = false;
 892                                                 float hiscore = 0;
 893                                                 for (u32 t = 0; t < tcount; t++)
 894                                                 {
 895                                                         if (!tc[t].drawn)
 896                                                         {
 897                                                                 if (tc[t].score > hiscore)
 898                                                                 {
 899                                                                         highest = t;
 900                                                                         hiscore = tc[t].score;
 901                                                                         found = true;
 902                                                                 }
 903                                                         }
 904                                                 }
 905                                                 if (!found)
 906                                                         break;
 907                                         }
 908
 909                                         // Output the best triangle
 910                                         u16 newind = buf->Vertices.size();
 911
 912                                         snode *s = sind.find(v[tc[highest].ind[0]]);
 913
 914                                         if (!s)
 915                                         {
 916                                                 buf->Vertices.push_back(v[tc[highest].ind[0]]);
 917                                                 buf->Indices.push_back(newind);
 918                                                 sind.insert(v[tc[highest].ind[0]], newind);
 919                                                 newind++;
 920                                         }
 921                                         else
 922                                         {
 923                                                 buf->Indices.push_back(s->getValue());
 924                                         }
 925
 926                                         s = sind.find(v[tc[highest].ind[1]]);
 927
 928                                         if (!s)
 929                                         {
 930                                                 buf->Vertices.push_back(v[tc[highest].ind[1]]);
 931                                                 buf->Indices.push_back(newind);
 932                                                 sind.insert(v[tc[highest].ind[1]], newind);
 933                                                 newind++;
 934                                         }
 935                                         else
 936                                         {
 937                                                 buf->Indices.push_back(s->getValue());
 938                                         }
 939
 940                                         s = sind.find(v[tc[highest].ind[2]]);
 941
 942                                         if (!s)
 943                                         {
 944                                                 buf->Vertices.push_back(v[tc[highest].ind[2]]);
 945                                                 buf->Indices.push_back(newind);
 946                                                 sind.insert(v[tc[highest].ind[2]], newind);
 947                                         }
 948                                         else
 949                                         {
 950                                                 buf->Indices.push_back(s->getValue());
 951                                         }
 952
 953                                         vc[tc[highest].ind[0]].NumActiveTris--;
 954                                         vc[tc[highest].ind[1]].NumActiveTris--;
 955                                         vc[tc[highest].ind[2]].NumActiveTris--;
 956
 957                                         tc[highest].drawn = true;
 958
 959                                         for (u16 j = 0; j < 3; j++)
 960                                         {
 961                                                 vcache *vert = &vc[tc[highest].ind[j]];
 962                                                 for (u16 t = 0; t < vert->tris.size(); t++)
 963                                                 {
 964                                                         if (highest == vert->tris[t])
 965                                                         {
 966                                                                 vert->tris.erase(t);
 967                                                                 break;
 968                                                         }
 969                                                 }
 970                                         }
 971
 972                                         lru.add(tc[highest].ind[0]);
 973                                         lru.add(tc[highest].ind[1]);
 974                                         highest = lru.add(tc[highest].ind[2]);
 975                                         drawcalls++;
 976                                 }
 977
 978                                 buf->setBoundingBox(mb->getBoundingBox());
 979                                 newmesh->addMeshBuffer(buf);
 980                                 buf->drop();
 981
 982                         }
 983                         break;
 984                         case video::EVT_TANGENTS:
 985                         {
 986                                 video::S3DVertexTangents *v = (video::S3DVertexTangents *) mb->getVertices();
 987
 988                                 scene::SMeshBufferTangents *buf = new scene::SMeshBufferTangents();
 989                                 buf->Material = mb->getMaterial();
 990
 991                                 buf->Vertices.reallocate(vcount);
 992                                 buf->Indices.reallocate(icount);
 993
 994                                 core::map<const video::S3DVertexTangents, const u16> sind; // search index for fast operation
 995                                 typedef core::map<const video::S3DVertexTangents, const u16>::Node snode;
 996
 997                                 // Main algorithm
 998                                 u32 highest = 0;
 999                                 u32 drawcalls = 0;
1000                                 for (;;)
1001                                 {
1002                                         if (tc[highest].drawn)
1003                                         {
1004                                                 bool found = false;
1005                                                 float hiscore = 0;
1006                                                 for (u32 t = 0; t < tcount; t++)
1007                                                 {
1008                                                         if (!tc[t].drawn)
1009                                                         {
1010                                                                 if (tc[t].score > hiscore)
1011                                                                 {
1012                                                                         highest = t;
1013                                                                         hiscore = tc[t].score;
1014                                                                         found = true;
1015                                                                 }
1016                                                         }
1017                                                 }
1018                                                 if (!found)
1019                                                         break;
1020                                         }
1021
1022                                         // Output the best triangle
1023                                         u16 newind = buf->Vertices.size();
1024
1025                                         snode *s = sind.find(v[tc[highest].ind[0]]);
1026
1027                                         if (!s)
1028                                         {
1029                                                 buf->Vertices.push_back(v[tc[highest].ind[0]]);
1030                                                 buf->Indices.push_back(newind);
1031                                                 sind.insert(v[tc[highest].ind[0]], newind);
1032                                                 newind++;
1033                                         }
1034                                         else
1035                                         {
1036                                                 buf->Indices.push_back(s->getValue());
1037                                         }
1038
1039                                         s = sind.find(v[tc[highest].ind[1]]);
1040
1041                                         if (!s)
1042                                         {
1043                                                 buf->Vertices.push_back(v[tc[highest].ind[1]]);
1044                                                 buf->Indices.push_back(newind);
1045                                                 sind.insert(v[tc[highest].ind[1]], newind);
1046                                                 newind++;
1047                                         }
1048                                         else
1049                                         {
1050                                                 buf->Indices.push_back(s->getValue());
1051                                         }
1052
1053                                         s = sind.find(v[tc[highest].ind[2]]);
1054
1055                                         if (!s)
1056                                         {
1057                                                 buf->Vertices.push_back(v[tc[highest].ind[2]]);
1058                                                 buf->Indices.push_back(newind);
1059                                                 sind.insert(v[tc[highest].ind[2]], newind);
1060                                         }
1061                                         else
1062                                         {
1063                                                 buf->Indices.push_back(s->getValue());
1064                                         }
1065
1066                                         vc[tc[highest].ind[0]].NumActiveTris--;
1067                                         vc[tc[highest].ind[1]].NumActiveTris--;
1068                                         vc[tc[highest].ind[2]].NumActiveTris--;
1069
1070                                         tc[highest].drawn = true;
1071
1072                                         for (u16 j = 0; j < 3; j++)
1073                                         {
1074                                                 vcache *vert = &vc[tc[highest].ind[j]];
1075                                                 for (u16 t = 0; t < vert->tris.size(); t++)
1076                                                 {
1077                                                         if (highest == vert->tris[t])
1078                                                         {
1079                                                                 vert->tris.erase(t);
1080                                                                 break;
1081                                                         }
1082                                                 }
1083                                         }
1084
1085                                         lru.add(tc[highest].ind[0]);
1086                                         lru.add(tc[highest].ind[1]);
1087                                         highest = lru.add(tc[highest].ind[2]);
1088                                         drawcalls++;
1089                                 }
1090
1091                                 buf->setBoundingBox(mb->getBoundingBox());
1092                                 newmesh->addMeshBuffer(buf);
1093                                 buf->drop();
1094                         }
1095                         break;
1096                 }
1097
1098                 delete [] vc;
1099                 delete [] tc;
1100
1101         } // for each meshbuffer
1102
1103         return newmesh;
1104 }