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 - http://www.flightgear.org/~curt
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 geometry->addKid( leaf );
187 * SSG callback for an in-range leaf of randomly-placed objects.
189 * This pretraversal callback is attached to a branch that is
190 * traversed only when a leaf is in range. If the leaf is not
191 * currently prepared to be populated with randomly-placed objects,
192 * this callback will prepare it (actual population is handled by
193 * the tri_in_range_callback for individual triangles).
195 * @param entity The entity to which the callback is attached (not used).
196 * @param mask The entity's traversal mask (not used).
197 * @return Always 1, to allow traversal and culling to continue.
200 leaf_in_range_callback (ssgEntity * entity, int mask)
202 SGLeafUserData * data = (SGLeafUserData *)entity->getUserData();
204 if (!data->is_filled_in) {
205 // Iterate through all the triangles
206 // and populate them.
207 int num_tris = data->leaf->getNumTriangles();
208 for ( int i = 0; i < num_tris; ++i ) {
209 data->setup_triangle(i);
211 data->is_filled_in = true;
218 * SSG callback for an out-of-range leaf of randomly-placed objects.
220 * This pretraversal callback is attached to a branch that is
221 * traversed only when a leaf is out of range. If the leaf is
222 * currently prepared to be populated with randomly-placed objects (or
223 * is actually populated), the objects will be removed.
225 * @param entity The entity to which the callback is attached (not used).
226 * @param mask The entity's traversal mask (not used).
227 * @return Always 0, to prevent any further traversal or culling.
230 leaf_out_of_range_callback (ssgEntity * entity, int mask)
232 SGLeafUserData * data = (SGLeafUserData *)entity->getUserData();
233 if (data->is_filled_in) {
234 data->branch->removeAllKids();
235 data->is_filled_in = false;
242 * Randomly place objects on a surface.
244 * The leaf node provides the geometry of the surface, while the
245 * material provides the objects and placement density. Latitude
246 * and longitude are required so that the objects can be rotated
247 * to the world-up vector. This function does not actually add
248 * any objects; instead, it attaches an ssgRangeSelector to the
249 * branch with callbacks to generate the objects when needed.
251 * @param leaf The surface where the objects should be placed.
252 * @param branch The branch that will hold the randomly-placed objects.
253 * @param center The center of the leaf in FlightGear coordinates.
254 * @param material_name The name of the surface's material.
257 gen_random_surface_objects (ssgLeaf *leaf,
262 // If the surface has no triangles, return
264 int num_tris = leaf->getNumTriangles();
268 // If the material has no randomly-placed
269 // objects, return now.
270 if (mat->get_object_group_count() < 1)
273 // Calculate the geodetic centre of
274 // the tile, for aligning automatic
276 double xyz[3], lon_rad, lat_rad, alt_m;
277 xyz[0] = center->x(); xyz[1] = center->y(); xyz[2] = center->z();
278 sgCartToGeod(xyz, &lat_rad, &lon_rad, &alt_m);
281 // max random object range: 20000m
282 float ranges[] = { 0, 20000, 1000000 };
283 ssgRangeSelector * lod = new ssgRangeSelector;
284 lod->setRanges(ranges, 3);
287 // Create the in-range and out-of-range
289 ssgBranch * in_range = new ssgBranch;
290 ssgBranch * out_of_range = new ssgBranch;
291 lod->addKid(in_range);
292 lod->addKid(out_of_range);
294 SGLeafUserData * data = new SGLeafUserData;
295 data->is_filled_in = false;
298 data->branch = in_range;
299 data->sin_lat = sin(lat_rad);
300 data->cos_lat = cos(lat_rad);
301 data->sin_lon = sin(lon_rad);
302 data->cos_lon = cos(lon_rad);
304 in_range->setUserData(data);
305 in_range->setTravCallback(SSG_CALLBACK_PRETRAV, leaf_in_range_callback);
306 out_of_range->setUserData(data);
307 out_of_range->setTravCallback(SSG_CALLBACK_PRETRAV,
308 leaf_out_of_range_callback);
310 ->addKid(new SGDummyBSphereEntity(leaf->getBSphere()->getRadius()));
315 ////////////////////////////////////////////////////////////////////////
317 ////////////////////////////////////////////////////////////////////////
319 // Load an Binary obj file
320 bool sgBinObjLoad( const string& path, const bool is_base,
322 double *bounding_radius,
323 SGMaterialLib *matlib,
324 bool use_random_objects,
326 ssgBranch *vasi_lights,
327 ssgBranch *rwy_lights,
328 ssgBranch *taxi_lights,
329 ssgVertexArray *ground_lights )
333 if ( ! obj.read_bin( path ) ) {
337 ssgBranch *local_terrain = new ssgBranch;
338 local_terrain->setName( "LocalTerrain" );
339 geometry->addKid( local_terrain );
341 geometry->setName( (char *)path.c_str() );
343 // reference point (center offset/bounding sphere)
344 *center = obj.get_gbs_center();
345 *bounding_radius = obj.get_gbs_radius();
347 point_list const& nodes = obj.get_wgs84_nodes();
348 // point_list const& colors = obj.get_colors();
349 point_list const& normals = obj.get_normals();
350 point_list const& texcoords = obj.get_texcoords();
355 group_list::size_type i;
358 string_list const& pt_materials = obj.get_pt_materials();
359 group_list const& pts_v = obj.get_pts_v();
360 group_list const& pts_n = obj.get_pts_n();
361 for ( i = 0; i < pts_v.size(); ++i ) {
362 // cout << "pts_v.size() = " << pts_v.size() << endl;
363 if ( pt_materials[i].substr(0, 3) == "RWY" ) {
364 // airport environment lighting
366 sgdSetVec3( up, center->x(), center->y(), center->z() );
367 // returns a transform -> lod -> leaf structure
368 ssgBranch *branch = sgMakeDirectionalLights( nodes, normals,
371 pt_materials[i], up );
372 if ( pt_materials[i] == "RWY_VASI_LIGHTS" ) {
373 vasi_lights->addKid( branch );
374 } else if ( pt_materials[i] == "RWY_BLUE_TAXIWAY_LIGHTS"
375 || pt_materials[i] == "RWY_GREEN_TAXIWAY_LIGHTS" )
377 taxi_lights->addKid( branch );
379 rwy_lights->addKid( branch );
383 material = pt_materials[i];
385 ssgLeaf *leaf = sgMakeLeaf( path, GL_POINTS, matlib, material,
386 nodes, normals, texcoords,
387 pts_v[i], pts_n[i], tex_index,
388 false, ground_lights );
389 local_terrain->addKid( leaf );
393 // Put all randomly-placed objects under a separate branch
394 // (actually an ssgRangeSelector) named "random-models".
395 ssgBranch * random_object_branch = 0;
396 if (use_random_objects) {
397 float ranges[] = { 0, 20000 }; // Maximum 20km range for random objects
398 ssgRangeSelector * object_lod = new ssgRangeSelector;
399 object_lod->setRanges(ranges, 2);
400 object_lod->setName("random-models");
401 geometry->addKid(object_lod);
402 random_object_branch = new ssgBranch;
403 object_lod->addKid(random_object_branch);
406 typedef map<string,list<Leaf> > LeafMap;
409 leaf.type = GL_TRIANGLES;
410 string_list const& tri_materials = obj.get_tri_materials();
411 group_list const& tris_v = obj.get_tris_v();
412 group_list const& tris_n = obj.get_tris_n();
413 group_list const& tris_tc = obj.get_tris_tc();
414 for ( i = 0; i < tris_v.size(); i++ ) {
416 leafMap[ tri_materials[i] ].push_back( leaf );
418 leaf.type = GL_TRIANGLE_STRIP;
419 string_list const& strip_materials = obj.get_strip_materials();
420 group_list const& strips_v = obj.get_strips_v();
421 group_list const& strips_n = obj.get_strips_n();
422 group_list const& strips_tc = obj.get_strips_tc();
423 for ( i = 0; i < strips_v.size(); i++ ) {
425 leafMap[ strip_materials[i] ].push_back( leaf );
427 leaf.type = GL_TRIANGLE_FAN;
428 string_list const& fan_materials = obj.get_fan_materials();
429 group_list const& fans_v = obj.get_fans_v();
430 group_list const& fans_n = obj.get_fans_n();
431 group_list const& fans_tc = obj.get_fans_tc();
432 for ( i = 0; i < fans_v.size(); i++ ) {
434 leafMap[ fan_materials[i] ].push_back( leaf );
437 LeafMap::iterator lmi = leafMap.begin();
438 while ( lmi != leafMap.end() ) {
439 list<Leaf> &leaf_list = lmi->second;
440 list<Leaf>::iterator li = leaf_list.begin();
441 while ( li != leaf_list.end() ) {
443 int ind = leaf.index;
444 if ( leaf.type == GL_TRIANGLES ) {
445 ssgLeaf *leaf = sgMakeLeaf( path, GL_TRIANGLES, matlib,
447 nodes, normals, texcoords,
448 tris_v[ind], tris_n[ind], tris_tc[ind],
449 is_base, ground_lights );
450 if ( use_random_objects ) {
451 SGMaterial *mat = matlib->find( tri_materials[ind] );
453 SG_LOG( SG_INPUT, SG_ALERT,
454 "Unknown material for random surface objects = "
455 << tri_materials[ind] );
457 gen_random_surface_objects( leaf, random_object_branch,
461 local_terrain->addKid( leaf );
462 } else if ( leaf.type == GL_TRIANGLE_STRIP ) {
463 ssgLeaf *leaf = sgMakeLeaf( path, GL_TRIANGLE_STRIP,
464 matlib, strip_materials[ind],
465 nodes, normals, texcoords,
466 strips_v[ind], strips_n[ind], strips_tc[ind],
467 is_base, ground_lights );
468 if ( use_random_objects ) {
469 SGMaterial *mat = matlib->find( strip_materials[ind] );
471 SG_LOG( SG_INPUT, SG_ALERT,
472 "Unknown material for random surface objects = "
473 << strip_materials[ind] );
475 gen_random_surface_objects( leaf, random_object_branch,
479 local_terrain->addKid( leaf );
481 ssgLeaf *leaf = sgMakeLeaf( path, GL_TRIANGLE_FAN,
482 matlib, fan_materials[ind],
483 nodes, normals, texcoords,
484 fans_v[ind], fans_n[ind], fans_tc[ind],
485 is_base, ground_lights );
486 if ( use_random_objects ) {
487 SGMaterial *mat = matlib->find( fan_materials[ind] );
489 SG_LOG( SG_INPUT, SG_ALERT,
490 "Unknown material for random surface objects = "
491 << fan_materials[ind] );
493 gen_random_surface_objects( leaf, random_object_branch,
497 local_terrain->addKid( leaf );