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