blender/io_mesh_mspgl/export_mspgl.py

   1 import bpy
   2
   3 class VertexCache:
   4         def __init__(self, size):
   5                 self.size = size
   6                 self.slots = [-1]*self.size
   7
   8         def fetch(self, v):
   9                 hit = v.index in self.slots
  10                 if hit:
  11                         self.slots.remove(v.index)
  12                 self.slots.append(v.index)
  13                 if not hit:
  14                         del self.slots[0]
  15                 return hit
  16
  17         def fetch_strip(self, strip):
  18                 hits = 0
  19                 for v in strip:
  20                         if self.fetch(v):
  21                                 hits += 1
  22                 return hits
  23
  24         def test_strip(self, strip):
  25                 hits = 0
  26                 for i in range(len(strip)):
  27                         if i>=self.size:
  28                                 break
  29                         if strip[i].index in self.slots[i:]:
  30                                 hits += 1
  31                 return hits
  32
  33
  34 class OutFile:
  35         def __init__(self, fn):
  36                 if fn==None:
  37                         self.file = sys.stdout
  38                 else:
  39                         self.file = open(fn, "w")
  40                 self.indent = 0
  41
  42         def make(self, kwd, *params):
  43                 pstr = ""
  44                 for p in params:
  45                         if type(p)==float:
  46                                 pstr += " %.6g"%p
  47                         else:
  48                                 pstr += " %s"%p
  49                 return "%s%s"%(kwd, pstr)
  50
  51         def write(self, kwd, *params):
  52                 self.file.write("%s%s;\n"%('\t'*self.indent, self.make(kwd, *params)))
  53
  54         def begin(self, kwd, *params):
  55                 i = '\t'*self.indent
  56                 self.file.write("%s%s\n%s{\n"%(i, self.make(kwd, *params), i))
  57                 self.indent += 1
  58
  59         def end(self):
  60                 self.indent -= 1
  61                 self.file.write("%s};\n"%('\t'*self.indent))
  62
  63
  64 class Exporter:
  65         def __init__(self):
  66                 self.use_strips = True
  67                 self.use_degen_tris = True
  68                 self.max_strip_len = 1024
  69                 self.optimize_cache = False
  70                 self.cache_size = 64
  71                 self.export_lines = True
  72                 self.export_uv = "UNIT0"
  73                 self.tbn_vecs = False
  74                 self.tbn_uvtex = ""
  75                 self.compound = False
  76                 self.object = False
  77                 self.material_tex = False
  78                 self.textures = "REF"
  79                 self.smoothing = "MSPGL"
  80
  81         def stripify(self, mesh, progress = None):
  82                 for f in mesh.faces:
  83                         f.flag = False
  84
  85                 faces_done = 0
  86                 strips = []
  87                 loose = []
  88
  89                 cache = None
  90                 if self.optimize_cache:
  91                         cache = VertexCache(self.cache_size)
  92
  93                 island = []
  94                 island_strips = []
  95                 while 1:
  96                         if not island:
  97                                 queue = []
  98                                 for f in mesh.faces:
  99                                         if not f.flag:
 100                                                 f.flag = True
 101                                                 queue.append(f)
 102                                                 break
 103
 104                                 if not queue:
 105                                         break
 106
 107                                 while queue:
 108                                         f = queue[0]
 109                                         del queue[0]
 110                                         island.append(f)
 111
 112                                         for e in f.edges:
 113                                                 other = e.other_face(f)
 114                                                 if other and not other.flag:
 115                                                         other.flag = True
 116                                                         queue.append(other)
 117
 118                                 for f in island:
 119                                         f.flag = False
 120
 121                         best = 5
 122                         face = None
 123                         for f in island:
 124                                 if f.flag:
 125                                         continue
 126                                 score = 0
 127                                 for e in f.edges:
 128                                         other = e.other_face(f)
 129                                         if other and not other.flag:
 130                                                 score += 1
 131                                 if score>0 and score<best:
 132                                         face = f
 133                                         best = score
 134
 135                         if not face:
 136                                 while island_strips:
 137                                         best = 0
 138                                         if cache:
 139                                                 best_hits = 0
 140                                                 for i in range(len(island_strips)):
 141                                                         hits = cache.test_strip(island_strips[i])
 142                                                         if hits>best_hits:
 143                                                                 best = i
 144                                                                 best_hits = hits
 145
 146                                         s = island_strips[best]
 147                                         del island_strips[best]
 148                                         strips.append(s)
 149
 150                                         if cache:
 151                                                 cache.fetch_strip(s)
 152
 153                                 faces_done += len(island)
 154                                 if progress:
 155                                         progress.set_progress(float(faces_done)/len(mesh.faces))
 156
 157                                 loose += [f for f in island if not f.flag]
 158                                 for f in island:
 159                                         f.flag = True
 160
 161                                 island = []
 162                                 island_strips = []
 163                                 continue
 164
 165                         strip = mesh.create_strip(face, self.max_strip_len)
 166                         if strip:
 167                                 island_strips.append(strip)
 168
 169                 if cache:
 170                         cache = VertexCache(self.cache_size)
 171                         total_hits = 0
 172
 173                 if self.use_degen_tris and strips:
 174                         big_strip = []
 175
 176                         for s in strips:
 177                                 if big_strip:
 178                                         glue = [big_strip[-1], s[0]]
 179                                         if len(big_strip)%2:
 180                                                 glue += [s[0]]
 181
 182                                         big_strip += glue
 183                                         if cache:
 184                                                 total_hits += cache.fetch_strip(glue)
 185
 186                                 big_strip += s
 187                                 if cache:
 188                                         total_hits += cache.fetch_strip(s)
 189
 190                         for f in loose:
 191                                 if len(big_strip)%2:
 192                                         order = (-1, -2, 0, 1)
 193                                 else:
 194                                         order = (0, 1, -1, -2)
 195                                 vertices = [f.vertices[i] for i in order[:len(f.vertices)]]
 196
 197                                 if big_strip:
 198                                         glue = [big_strip[-1], vertices[0]]
 199                                         big_strip += glue
 200                                         if cache:
 201                                                 total_hits += cache.fetch_strip(glue)
 202
 203                                 big_strip += vertices
 204                                 if cache:
 205                                         total_hits += cache.fetch_strip(vertices)
 206
 207                         strips = [big_strip]
 208                         loose = []
 209
 210                 return strips, loose
 211
 212         def export(self, context, fn):
 213                 if self.compound:
 214                         objs = context.selected_objects
 215                 else:
 216                         objs = [context.active_object]
 217
 218                 if not objs:
 219                         raise Exception("Nothing to export")
 220                 for o in objs:
 221                         if o.type!="MESH":
 222                                 raise Exception("Can only export Mesh data")
 223
 224                 from .mesh import Mesh
 225                 from .util import Progress
 226
 227                 progress = Progress()
 228                 progress.set_task("Preparing", 0.0, 0.0)
 229
 230                 mesh = None
 231                 bmeshes = []
 232                 for o in objs:
 233                         bmesh = o.to_mesh(context.scene, True, "PREVIEW")
 234                         bmeshes.append(bmesh)
 235                         if not mesh:
 236                                 mesh = Mesh(bmesh)
 237                         else:
 238                                 mesh.splice(Mesh(bmesh))
 239
 240                 progress.set_task("Smoothing", 0.05, 0.35)
 241                 if self.smoothing=="NONE":
 242                         mesh.flatten_faces()
 243                 mesh.split_smooth(progress)
 244
 245                 if self.smoothing!="BLENDER":
 246                         mesh.compute_normals()
 247
 248                 if self.material_tex and mesh.materials:
 249                         mesh.generate_material_uv()
 250
 251                 texunits = []
 252                 if mesh.uv_layers and self.export_uv!="NONE":
 253                         # Figure out which UV layers to export
 254                         if self.export_uv=="UNIT0":
 255                                 if mesh.uv_layers[0].unit==0:
 256                                         texunits = [0]
 257                         else:
 258                                 texunits = range(len(mesh.uv_layers))
 259                         texunits = [(i, mesh.uv_layers[i]) for i in texunits]
 260                         texunits = [u for u in texunits if not u[1].hidden]
 261
 262                         if self.tbn_vecs:
 263                                 # TBN coordinates must be generated before vertices are split by any other layer
 264                                 uv_names = [u.name for i, u in texunits]
 265                                 if self.tbn_uvtex in uv_names:
 266                                         tbn_index = uv_names.index(self.tbn_uvtex)
 267                                         unit = texunits[tbn_index]
 268                                         del texunits[tbn_index]
 269                                         texunits.insert(0, unit)
 270
 271                         for i, u in texunits:
 272                                 progress.set_task("Splitting UVs", 0.35+0.3*i/len(texunits), 0.35+0.3*(i+1)/len(texunits))
 273                                 mesh.split_uv(i, progress)
 274                                 if self.tbn_vecs and u.name==self.tbn_uvtex:
 275                                         mesh.compute_uv()
 276                                         mesh.compute_tbn(i)
 277
 278                         mesh.compute_uv()
 279
 280                 strips = []
 281                 loose = mesh.faces
 282                 if self.use_strips:
 283                         progress.set_task("Creating strips", 0.65, 0.95)
 284                         strips, loose = self.stripify(mesh, progress)
 285
 286                 progress.set_task("Writing file", 0.95, 1.0)
 287
 288                 out_file = OutFile(fn)
 289                 if self.object:
 290                         out_file.begin("mesh")
 291
 292                 fmt = "NORMAL3"
 293                 if texunits:
 294                         for i, u in texunits:
 295                                 if u.unit==0:
 296                                         fmt += "_TEXCOORD2"
 297                                 else:
 298                                         fmt += "_TEXCOORD2%d"%u.unit
 299                         if self.tbn_vecs:
 300                                 fmt += "_ATTRIB33_ATTRIB34"
 301                 fmt += "_VERTEX3"
 302                 out_file.begin("vertices", fmt)
 303                 normal = None
 304                 uvs = [None]*len(texunits)
 305                 tan = None
 306                 bino = None
 307                 for v in mesh.vertices:
 308                         if v.normal!=normal:
 309                                 out_file.write("normal3", *v.normal)
 310                                 normal = v.normal
 311                         for i, u in texunits:
 312                                 if v.uvs[i]!=uvs[i]:
 313                                         if u.unit==0:
 314                                                 out_file.write("texcoord2", *v.uvs[i])
 315                                         else:
 316                                                 out_file.write("multitexcoord2", u.unit, *v.uvs[i])
 317                                         uvs[i] = v.uvs[i]
 318                         if v.tan!=tan:
 319                                 out_file.write("attrib3", 3, *v.tan)
 320                                 tan = v.tan
 321                         if v.bino!=bino:
 322                                 out_file.write("attrib3", 4, *v.bino)
 323                                 bino = v.bino
 324                         out_file.write("vertex3", *v.co)
 325                 out_file.end()
 326                 for s in strips:
 327                         out_file.begin("batch", "TRIANGLE_STRIP")
 328                         indices = []
 329                         n = 0
 330                         for v in s:
 331                                 indices.append(v.index)
 332                                 if len(indices)>=32:
 333                                         out_file.write("indices", *indices)
 334                                         indices = []
 335                         if indices:
 336                                 out_file.write("indices", *indices)
 337                         out_file.end()
 338
 339                 if loose:
 340                         out_file.begin("batch", "TRIANGLES")
 341                         for f in loose:
 342                                 for i in range(2, len(f.vertices)):
 343                                         out_file.write("indices", f.vertices[0].index, f.vertices[i-1].index, f.vertices[i].index)
 344                         out_file.end()
 345
 346                 if self.export_lines and mesh.lines:
 347                         out_file.write("batch", "LINES")
 348                         for l in mesh.lines:
 349                                 out_file.write("indices", l.vertices[0].index, l.vertices[1].index)
 350                         out_file.end()
 351
 352                 if self.object:
 353                         out_file.end()
 354                         out_file.begin("technique")
 355                         out_file.begin("pass", '""')
 356                         if mesh.materials:
 357                                 if self.material_tex:
 358                                         out_file.begin("material")
 359                                         out_file.write("diffuse", 1.0, 1.0, 1.0, 1.0)
 360                                         out_file.end()
 361                                         index = 0
 362                                         for u in mesh.uv_layers:
 363                                                 if u.name=="material_tex":
 364                                                         index = u.unit
 365                                         out_file.begin("texunit", index)
 366                                         out_file.begin("texture2d")
 367                                         out_file.write("min_filter", "NEAREST")
 368                                         out_file.write("mag_filter", "NEAREST")
 369                                         out_file.write("storage", "RGB", len(mesh.materials), 1)
 370                                         texdata = '"'
 371                                         for m in mesh.materials:
 372                                                 color = [int(c*255) for c in m.diffuse_color]
 373                                                 texdata += "\\x%02X\\x%02X\\x%02X"%tuple(color)
 374                                         texdata += '"'
 375                                         out_file.write("raw_data", texdata)
 376                                         out_file.end()
 377                                         out_file.end()
 378                                 else:
 379                                         mat = mesh.materials[0]
 380                                         out_file.begin("material")
 381                                         diff = mat.diffuse_color
 382                                         out_file.write("diffuse", diff.r, diff.g, diff.b, 1.0)
 383                                         amb = diff*mat.ambient
 384                                         out_file.write("ambient", amb.r, amb.g, amb.b, 1.0)
 385                                         spec = mat.specular_color*mat.specular_intensity
 386                                         out_file.write("specular", spec.r, spec.g, spec.b, 1.0)
 387                                         out_file.write("shininess", mat.specular_hardness);
 388                                         out_file.end()
 389
 390                                 if self.textures!="NONE":
 391                                         for slot in mesh.materials[0].texture_slots:
 392                                                 if not slot:
 393                                                         continue
 394
 395                                                 tex = slot.texture
 396                                                 if tex.type!="IMAGE":
 397                                                         continue
 398
 399                                                 if slot.uv_layer:
 400                                                         for u in mesh.uv_layers:
 401                                                                 if u.name==slot.uv_layer:
 402                                                                         index = u.unit
 403                                                 else:
 404                                                         index = mesh.uv_layers[0].unit
 405
 406                                                 out_file.begin("texunit", index)
 407                                                 if self.textures=="INLINE":
 408                                                         out_file.begin("texture2d")
 409                                                         out_file.write("min_filter", "LINEAR")
 410                                                         out_file.write("storage", "RGBA", tex.image.size[0], tex.image.size[1])
 411                                                         texdata = '"'
 412                                                         for p in tex.image.pixels:
 413                                                                 texdata += "\\x%02X"%int(p*255)
 414                                                         texdata += '"'
 415                                                         out_file.write("raw_data", texdata)
 416                                                         out_file.end()
 417                                                 else:
 418                                                         out_file.write("texture", '"%s"'%tex.image.name)
 419                                                 out_file.end()
 420
 421                         out_file.end()
 422                         out_file.end()
 423
 424                 progress.set_task("Done", 1.0, 1.0)
 425
 426                 for m in bmeshes:
 427                         bpy.data.meshes.remove(m)