1 // obj.cxx -- routines to handle loading scenery and building the plib
4 // Written by Curtis Olson, started October 1997.
6 // Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
8 // This program is free software; you can redistribute it and/or
9 // modify it under the terms of the GNU General Public License as
10 // published by the Free Software Foundation; either version 2 of the
11 // License, or (at your option) any later version.
13 // This program is distributed in the hope that it will be useful, but
14 // WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 // General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 # include <simgear_config.h>
29 #include <simgear/compiler.h>
35 #include <simgear/bucket/newbucket.hxx>
36 #include <simgear/io/sg_binobj.hxx>
37 #include <simgear/math/sg_geodesy.hxx>
38 #include <simgear/math/sg_types.hxx>
39 #include <simgear/misc/texcoord.hxx>
40 #include <simgear/scene/material/mat.hxx>
41 #include <simgear/scene/material/matlib.hxx>
42 #include <simgear/scene/tgdb/leaf.hxx>
43 #include <simgear/scene/tgdb/pt_lights.hxx>
44 #include <simgear/scene/tgdb/userdata.hxx>
57 // Generate an ocean tile
58 bool sgGenTile( const string& path, SGBucket b,
59 Point3D *center, double *bounding_radius,
60 SGMaterialLib *matlib, ssgBranch* geometry )
62 ssgSimpleState *state = NULL;
64 geometry->setName( (char *)path.c_str() );
66 double tex_width = 1000.0;
69 // find Ocean material in the properties list
70 SGMaterial *mat = matlib->find( "Ocean" );
72 // set the texture width and height values for this
74 tex_width = mat->get_xsize();
75 // tex_height = newmat->get_ysize();
78 state = mat->get_state();
80 SG_LOG( SG_TERRAIN, SG_ALERT,
81 "Ack! unknown usemtl name = " << "Ocean"
85 // Calculate center point
86 double clon = b.get_center_lon();
87 double clat = b.get_center_lat();
88 double height = b.get_height();
89 double width = b.get_width();
91 *center = sgGeodToCart( Point3D(clon*SGD_DEGREES_TO_RADIANS,
92 clat*SGD_DEGREES_TO_RADIANS,
94 // cout << "center = " << center << endl;;
96 // Caculate corner vertices
98 geod[0] = Point3D( clon - width/2.0, clat - height/2.0, 0.0 );
99 geod[1] = Point3D( clon + width/2.0, clat - height/2.0, 0.0 );
100 geod[2] = Point3D( clon + width/2.0, clat + height/2.0, 0.0 );
101 geod[3] = Point3D( clon - width/2.0, clat + height/2.0, 0.0 );
105 for ( i = 0; i < 4; ++i ) {
106 rad[i] = Point3D( geod[i].x() * SGD_DEGREES_TO_RADIANS,
107 geod[i].y() * SGD_DEGREES_TO_RADIANS,
111 Point3D cart[4], rel[4];
112 for ( i = 0; i < 4; ++i ) {
113 cart[i] = sgGeodToCart(rad[i]);
114 rel[i] = cart[i] - *center;
115 // cout << "corner " << i << " = " << cart[i] << endl;
118 // Calculate bounding radius
119 *bounding_radius = center->distance3D( cart[0] );
120 // cout << "bounding radius = " << t->bounding_radius << endl;
124 for ( i = 0; i < 4; ++i ) {
125 double length = cart[i].distance3D( Point3D(0.0) );
126 normals[i] = cart[i] / length;
127 // cout << "normal = " << normals[i] << endl;
130 // Calculate texture coordinates
131 point_list geod_nodes;
133 geod_nodes.reserve(4);
136 rectangle.reserve(4);
137 for ( i = 0; i < 4; ++i ) {
138 geod_nodes.push_back( geod[i] );
139 rectangle.push_back( i );
141 point_list texs = sgCalcTexCoords( b, geod_nodes, rectangle,
142 1000.0 / tex_width );
144 // Allocate ssg structure
145 ssgVertexArray *vl = new ssgVertexArray( 4 );
146 ssgNormalArray *nl = new ssgNormalArray( 4 );
147 ssgTexCoordArray *tl = new ssgTexCoordArray( 4 );
148 ssgColourArray *cl = new ssgColourArray( 1 );
151 sgSetVec4( color, 1.0, 1.0, 1.0, 1.0 );
154 // sgVec3 *vtlist = new sgVec3 [ 4 ];
155 // t->vec3_ptrs.push_back( vtlist );
156 // sgVec3 *vnlist = new sgVec3 [ 4 ];
157 // t->vec3_ptrs.push_back( vnlist );
158 // sgVec2 *tclist = new sgVec2 [ 4 ];
159 // t->vec2_ptrs.push_back( tclist );
163 for ( i = 0; i < 4; ++i ) {
165 rel[i].x(), rel[i].y(), rel[i].z() );
169 normals[i].x(), normals[i].y(), normals[i].z() );
172 sgSetVec2( tmp2, texs[i].x(), texs[i].y());
177 new ssgVtxTable ( GL_TRIANGLE_FAN, vl, nl, tl, cl );
179 leaf->setState( state );
180 #if PLIB_VERSION > 183
184 geometry->addKid( leaf );
191 * SSG callback for an in-range leaf of randomly-placed objects.
193 * This pretraversal callback is attached to a branch that is
194 * traversed only when a leaf is in range. If the leaf is not
195 * currently prepared to be populated with randomly-placed objects,
196 * this callback will prepare it (actual population is handled by
197 * the tri_in_range_callback for individual triangles).
199 * @param entity The entity to which the callback is attached (not used).
200 * @param mask The entity's traversal mask (not used).
201 * @return Always 1, to allow traversal and culling to continue.
204 leaf_in_range_callback (ssgEntity * entity, int mask)
206 SGLeafUserData * data = (SGLeafUserData *)entity->getUserData();
208 if (!data->is_filled_in) {
209 // Iterate through all the triangles
210 // and populate them.
211 int num_tris = data->leaf->getNumTriangles();
212 for ( int i = 0; i < num_tris; ++i ) {
213 data->setup_triangle(i);
215 data->is_filled_in = true;
222 * SSG callback for an out-of-range leaf of randomly-placed objects.
224 * This pretraversal callback is attached to a branch that is
225 * traversed only when a leaf is out of range. If the leaf is
226 * currently prepared to be populated with randomly-placed objects (or
227 * is actually populated), the objects will be removed.
229 * @param entity The entity to which the callback is attached (not used).
230 * @param mask The entity's traversal mask (not used).
231 * @return Always 0, to prevent any further traversal or culling.
234 leaf_out_of_range_callback (ssgEntity * entity, int mask)
236 SGLeafUserData * data = (SGLeafUserData *)entity->getUserData();
237 if (data->is_filled_in) {
238 data->branch->removeAllKids();
239 data->is_filled_in = false;
246 * Randomly place objects on a surface.
248 * The leaf node provides the geometry of the surface, while the
249 * material provides the objects and placement density. Latitude
250 * and longitude are required so that the objects can be rotated
251 * to the world-up vector. This function does not actually add
252 * any objects; instead, it attaches an ssgRangeSelector to the
253 * branch with callbacks to generate the objects when needed.
255 * @param leaf The surface where the objects should be placed.
256 * @param branch The branch that will hold the randomly-placed objects.
257 * @param center The center of the leaf in FlightGear coordinates.
258 * @param material_name The name of the surface's material.
261 gen_random_surface_objects (ssgLeaf *leaf,
266 // If the surface has no triangles, return
268 int num_tris = leaf->getNumTriangles();
272 // If the material has no randomly-placed
273 // objects, return now.
274 if (mat->get_object_group_count() < 1)
277 // Calculate the geodetic centre of
278 // the tile, for aligning automatic
280 double xyz[3], lon_rad, lat_rad, alt_m;
281 xyz[0] = center->x(); xyz[1] = center->y(); xyz[2] = center->z();
282 sgCartToGeod(xyz, &lat_rad, &lon_rad, &alt_m);
285 // max random object range: 20000m
286 float ranges[] = { 0, 20000, 1000000 };
287 ssgRangeSelector * lod = new ssgRangeSelector;
288 lod->setRanges(ranges, 3);
291 // Create the in-range and out-of-range
293 ssgBranch * in_range = new ssgBranch;
294 ssgBranch * out_of_range = new ssgBranch;
295 lod->addKid(in_range);
296 lod->addKid(out_of_range);
298 SGLeafUserData * data = new SGLeafUserData;
299 data->is_filled_in = false;
302 data->branch = in_range;
303 data->sin_lat = sin(lat_rad);
304 data->cos_lat = cos(lat_rad);
305 data->sin_lon = sin(lon_rad);
306 data->cos_lon = cos(lon_rad);
308 in_range->setUserData(data);
309 in_range->setTravCallback(SSG_CALLBACK_PRETRAV, leaf_in_range_callback);
310 out_of_range->setUserData(data);
311 out_of_range->setTravCallback(SSG_CALLBACK_PRETRAV,
312 leaf_out_of_range_callback);
314 ->addKid(new SGDummyBSphereEntity(leaf->getBSphere()->getRadius()));
319 ////////////////////////////////////////////////////////////////////////
321 ////////////////////////////////////////////////////////////////////////
323 // Load an Binary obj file
324 bool sgBinObjLoad( const string& path, const bool is_base,
326 double *bounding_radius,
327 SGMaterialLib *matlib,
328 bool use_random_objects,
330 ssgBranch *vasi_lights,
331 ssgBranch *rwy_lights,
332 ssgBranch *taxi_lights,
333 ssgVertexArray *ground_lights )
337 if ( ! obj.read_bin( path ) ) {
341 ssgBranch *local_terrain = new ssgBranch;
342 local_terrain->setName( "LocalTerrain" );
343 geometry->addKid( local_terrain );
345 geometry->setName( (char *)path.c_str() );
347 // reference point (center offset/bounding sphere)
348 *center = obj.get_gbs_center();
349 *bounding_radius = obj.get_gbs_radius();
351 point_list const& nodes = obj.get_wgs84_nodes();
352 // point_list const& colors = obj.get_colors();
353 point_list const& normals = obj.get_normals();
354 point_list const& texcoords = obj.get_texcoords();
359 group_list::size_type i;
362 string_list const& pt_materials = obj.get_pt_materials();
363 group_list const& pts_v = obj.get_pts_v();
364 group_list const& pts_n = obj.get_pts_n();
365 for ( i = 0; i < pts_v.size(); ++i ) {
366 // cout << "pts_v.size() = " << pts_v.size() << endl;
367 if ( pt_materials[i].substr(0, 3) == "RWY" ) {
368 // airport environment lighting
370 sgdSetVec3( up, center->x(), center->y(), center->z() );
371 // returns a transform -> lod -> leaf structure
372 ssgBranch *branch = sgMakeDirectionalLights( nodes, normals,
375 pt_materials[i], up );
376 if ( pt_materials[i] == "RWY_VASI_LIGHTS" ) {
377 vasi_lights->addKid( branch );
378 } else if ( pt_materials[i] == "RWY_BLUE_TAXIWAY_LIGHTS"
379 || pt_materials[i] == "RWY_GREEN_TAXIWAY_LIGHTS" )
381 taxi_lights->addKid( branch );
383 rwy_lights->addKid( branch );
387 material = pt_materials[i];
389 ssgLeaf *leaf = sgMakeLeaf( path, GL_POINTS, matlib, material,
390 nodes, normals, texcoords,
391 pts_v[i], pts_n[i], tex_index,
392 false, ground_lights );
393 local_terrain->addKid( leaf );
397 // Put all randomly-placed objects under a separate branch
398 // (actually an ssgRangeSelector) named "random-models".
399 ssgBranch * random_object_branch = 0;
400 if (use_random_objects) {
401 float ranges[] = { 0, 20000 }; // Maximum 20km range for random objects
402 ssgRangeSelector * object_lod = new ssgRangeSelector;
403 object_lod->setRanges(ranges, 2);
404 object_lod->setName("random-models");
405 geometry->addKid(object_lod);
406 random_object_branch = new ssgBranch;
407 object_lod->addKid(random_object_branch);
410 typedef map<string,list<Leaf> > LeafMap;
413 leaf.type = GL_TRIANGLES;
414 string_list const& tri_materials = obj.get_tri_materials();
415 group_list const& tris_v = obj.get_tris_v();
416 group_list const& tris_n = obj.get_tris_n();
417 group_list const& tris_tc = obj.get_tris_tc();
418 for ( i = 0; i < tris_v.size(); i++ ) {
420 leafMap[ tri_materials[i] ].push_back( leaf );
422 leaf.type = GL_TRIANGLE_STRIP;
423 string_list const& strip_materials = obj.get_strip_materials();
424 group_list const& strips_v = obj.get_strips_v();
425 group_list const& strips_n = obj.get_strips_n();
426 group_list const& strips_tc = obj.get_strips_tc();
427 for ( i = 0; i < strips_v.size(); i++ ) {
429 leafMap[ strip_materials[i] ].push_back( leaf );
431 leaf.type = GL_TRIANGLE_FAN;
432 string_list const& fan_materials = obj.get_fan_materials();
433 group_list const& fans_v = obj.get_fans_v();
434 group_list const& fans_n = obj.get_fans_n();
435 group_list const& fans_tc = obj.get_fans_tc();
436 for ( i = 0; i < fans_v.size(); i++ ) {
438 leafMap[ fan_materials[i] ].push_back( leaf );
441 LeafMap::iterator lmi = leafMap.begin();
442 while ( lmi != leafMap.end() ) {
443 list<Leaf> &leaf_list = lmi->second;
444 list<Leaf>::iterator li = leaf_list.begin();
445 while ( li != leaf_list.end() ) {
447 int ind = leaf.index;
448 if ( leaf.type == GL_TRIANGLES ) {
449 ssgLeaf *leaf = sgMakeLeaf( path, GL_TRIANGLES, matlib,
451 nodes, normals, texcoords,
452 tris_v[ind], tris_n[ind], tris_tc[ind],
453 is_base, ground_lights );
454 if ( use_random_objects ) {
455 SGMaterial *mat = matlib->find( tri_materials[ind] );
457 SG_LOG( SG_INPUT, SG_ALERT,
458 "Unknown material for random surface objects = "
459 << tri_materials[ind] );
461 gen_random_surface_objects( leaf, random_object_branch,
465 local_terrain->addKid( leaf );
466 } else if ( leaf.type == GL_TRIANGLE_STRIP ) {
467 ssgLeaf *leaf = sgMakeLeaf( path, GL_TRIANGLE_STRIP,
468 matlib, strip_materials[ind],
469 nodes, normals, texcoords,
470 strips_v[ind], strips_n[ind], strips_tc[ind],
471 is_base, ground_lights );
472 if ( use_random_objects ) {
473 SGMaterial *mat = matlib->find( strip_materials[ind] );
475 SG_LOG( SG_INPUT, SG_ALERT,
476 "Unknown material for random surface objects = "
477 << strip_materials[ind] );
479 gen_random_surface_objects( leaf, random_object_branch,
483 local_terrain->addKid( leaf );
485 ssgLeaf *leaf = sgMakeLeaf( path, GL_TRIANGLE_FAN,
486 matlib, fan_materials[ind],
487 nodes, normals, texcoords,
488 fans_v[ind], fans_n[ind], fans_tc[ind],
489 is_base, ground_lights );
490 if ( use_random_objects ) {
491 SGMaterial *mat = matlib->find( fan_materials[ind] );
493 SG_LOG( SG_INPUT, SG_ALERT,
494 "Unknown material for random surface objects = "
495 << fan_materials[ind] );
497 gen_random_surface_objects( leaf, random_object_branch,
501 local_terrain->addKid( leaf );