X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=simgear%2Fscene%2Ftgdb%2Fuserdata.cxx;h=fab67b2fcedd11bb4f67b625ed1de7d2a975ac24;hb=7e7ce2f38e87d6244e05730fa4382da088bb25f1;hp=5a174ac85af8c49526232c7375ae56301d96f8b8;hpb=1d8b352d2dca57b6d7c9ce35a86a2106304125ff;p=simgear.git diff --git a/simgear/scene/tgdb/userdata.cxx b/simgear/scene/tgdb/userdata.cxx index 5a174ac8..fab67b2f 100644 --- a/simgear/scene/tgdb/userdata.cxx +++ b/simgear/scene/tgdb/userdata.cxx @@ -3,7 +3,7 @@ // // Written by David Megginson, started December 2001. // -// Copyright (C) 2001 - 2003 Curtis L. Olson - curt@flightgear.org +// Copyright (C) 2001 - 2003 Curtis L. Olson - http://www.flightgear.org/~curt // // This program is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public License as @@ -17,13 +17,15 @@ // // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software -// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. // // $Id$ +#ifdef HAVE_CONFIG_H +# include +#endif -#include -#include +#include #include #include @@ -32,8 +34,9 @@ #include #include +#include "SGModelBin.hxx" #include "userdata.hxx" - +#include "SGReaderWriterBTG.hxx" // the following are static values needed by the runtime object // loader. However, the loading is done via a call back so these @@ -42,284 +45,22 @@ // building / drawing any scenery. static bool _inited = false; -static SGModelLib *modellib = NULL; -static string model_root = ""; static SGPropertyNode *root_props = NULL; -static double sim_time_sec = 0.0; -void sgUserDataInit( SGModelLib *m, const string &r, - SGPropertyNode *p, double t ) { +// Because BTG files are now loaded through the osgDB::Registry, there +// are no symbols referenced by FlightGear in this library other than +// sgUserDataInit. But the libraries are all statically linked, so +// none of the other object files in this library would be included in +// the executable! Sticking the static proxy here forces the BTG code +// to be sucked in. +osgDB::RegisterReaderWriterProxy g_readerWriter_BTG_Proxy; + +void sgUserDataInit( SGPropertyNode *p ) { _inited = true; - modellib = m; - model_root = r; root_props = p; - sim_time_sec = t; -} - - -static void random_pt_inside_tri( float *res, - float *n1, float *n2, float *n3 ) -{ - double a = sg_random(); - double b = sg_random(); - if ( a + b > 1.0 ) { - a = 1.0 - a; - b = 1.0 - b; - } - double c = 1 - a - b; - - res[0] = n1[0]*a + n2[0]*b + n3[0]*c; - res[1] = n1[1]*a + n2[1]*b + n3[1]*c; - res[2] = n1[2]*a + n2[2]*b + n3[2]*c; -} - - -/** - * Fill in a triangle with randomly-placed objects. - * - * This method is invoked by a callback when the triangle is in range - * but not yet populated. - * - */ - -void SGTriUserData::fill_in_triangle () -{ - // generate a repeatable random seed - sg_srandom(seed); - - int nObjects = object_group->get_object_count(); - - for (int i = 0; i < nObjects; i++) { - SGMatModel * object = object_group->get_object(i); - double num = area / object->get_coverage_m2(); - - // place an object each unit of area - while ( num > 1.0 ) { - add_object_to_triangle(object); - num -= 1.0; - } - // for partial units of area, use a zombie door method to - // create the proper random chance of an object being created - // for this triangle - if ( num > 0.0 ) { - if ( sg_random() <= num ) { - // a zombie made it through our door - add_object_to_triangle(object); - } - } - } -} - -void SGTriUserData::add_object_to_triangle (SGMatModel * object) -{ - // Set up the random heading if required. - double hdg_deg = 0; - if (object->get_heading_type() == SGMatModel::HEADING_RANDOM) - hdg_deg = sg_random() * 360; - - sgMat4 mat; - makeWorldMatrix(mat, hdg_deg); - - ssgTransform * pos = new ssgTransform; - pos->setTransform(mat); - // the parameters to get_random_model() are set in local static - // data via the ssgUserDataInit() function. This function must be - // called before any scenery is drawn. - pos->addKid( object->get_random_model( modellib, model_root, - root_props, sim_time_sec ) - ); - branch->addKid(pos); } -void SGTriUserData::makeWorldMatrix (sgMat4 mat, double hdg_deg ) -{ - if (hdg_deg == 0) { - mat[0][0] = leafData->sin_lat * leafData->cos_lon; - mat[0][1] = leafData->sin_lat * leafData->sin_lon; - mat[0][2] = -leafData->cos_lat; - mat[0][3] = SG_ZERO; +osg::Node* sgGetRandomModel(SGMatModel *obj) { + return obj->get_random_model( root_props ); + } - mat[1][0] = -leafData->sin_lon; - mat[1][1] = leafData->cos_lon; - mat[1][2] = SG_ZERO; - mat[1][3] = SG_ZERO; - } else { - float sin_hdg = sin( hdg_deg * SGD_DEGREES_TO_RADIANS ) ; - float cos_hdg = cos( hdg_deg * SGD_DEGREES_TO_RADIANS ) ; - mat[0][0] = cos_hdg * leafData->sin_lat * leafData->cos_lon - sin_hdg * leafData->sin_lon; - mat[0][1] = cos_hdg * leafData->sin_lat * leafData->sin_lon + sin_hdg * leafData->cos_lon; - mat[0][2] = -cos_hdg * leafData->cos_lat; - mat[0][3] = SG_ZERO; - - mat[1][0] = -sin_hdg * leafData->sin_lat * leafData->cos_lon - cos_hdg * leafData->sin_lon; - mat[1][1] = -sin_hdg * leafData->sin_lat * leafData->sin_lon + cos_hdg * leafData->cos_lon; - mat[1][2] = sin_hdg * leafData->cos_lat; - mat[1][3] = SG_ZERO; - } - - mat[2][0] = leafData->cos_lat * leafData->cos_lon; - mat[2][1] = leafData->cos_lat * leafData->sin_lon; - mat[2][2] = leafData->sin_lat; - mat[2][3] = SG_ZERO; - - // translate to random point in triangle - sgVec3 result; - random_pt_inside_tri(result, p1, p2, p3); - sgSubVec3(mat[3], result, center); - - mat[3][3] = SG_ONE ; -} - -/** - * SSG callback for an in-range triangle of randomly-placed objects. - * - * This pretraversal callback is attached to a branch that is traversed - * only when a triangle is in range. If the triangle is not currently - * populated with randomly-placed objects, this callback will populate - * it. - * - * @param entity The entity to which the callback is attached (not used). - * @param mask The entity's traversal mask (not used). - * @return Always 1, to allow traversal and culling to continue. - */ -static int -tri_in_range_callback (ssgEntity * entity, int mask) -{ - SGTriUserData * data = (SGTriUserData *)entity->getUserData(); - if (!data->is_filled_in) { - data->fill_in_triangle(); - data->is_filled_in = true; - } - return 1; -} - - -/** - * SSG callback for an out-of-range triangle of randomly-placed objects. - * - * This pretraversal callback is attached to a branch that is traversed - * only when a triangle is out of range. If the triangle is currently - * populated with randomly-placed objects, the objects will be removed. - * - * - * @param entity The entity to which the callback is attached (not used). - * @param mask The entity's traversal mask (not used). - * @return Always 0, to prevent any further traversal or culling. - */ -static int -tri_out_of_range_callback (ssgEntity * entity, int mask) -{ - SGTriUserData * data = (SGTriUserData *)entity->getUserData(); - if (data->is_filled_in) { - data->branch->removeAllKids(); - data->is_filled_in = false; - } - return 0; -} - - -/** - * Calculate the bounding radius of a triangle from its center. - * - * @param center The triangle center. - * @param p1 The first point in the triangle. - * @param p2 The second point in the triangle. - * @param p3 The third point in the triangle. - * @return The greatest distance any point lies from the center. - */ -static inline float -get_bounding_radius( sgVec3 center, float *p1, float *p2, float *p3) -{ - return sqrt( SG_MAX3( sgDistanceSquaredVec3(center, p1), - sgDistanceSquaredVec3(center, p2), - sgDistanceSquaredVec3(center, p3) ) ); -} - - -/** - * Set up a triangle for randomly-placed objects. - * - * No objects will be added unless the triangle comes into range. - * - */ - -void SGLeafUserData::setup_triangle (int i ) -{ - short n1, n2, n3; - leaf->getTriangle(i, &n1, &n2, &n3); - - float * p1 = leaf->getVertex(n1); - float * p2 = leaf->getVertex(n2); - float * p3 = leaf->getVertex(n3); - - // Set up a single center point for LOD - sgVec3 center; - sgSetVec3(center, - (p1[0] + p2[0] + p3[0]) / 3.0, - (p1[1] + p2[1] + p3[1]) / 3.0, - (p1[2] + p2[2] + p3[2]) / 3.0); - double area = sgTriArea(p1, p2, p3); - - // maximum radius of an object from center. - double bounding_radius = get_bounding_radius(center, p1, p2, p3); - - // Set up a transformation to the center - // point, so that everything else can - // be specified relative to it. - ssgTransform * location = new ssgTransform; - sgMat4 TRANS; - sgMakeTransMat4(TRANS, center); - location->setTransform(TRANS); - branch->addKid(location); - - // Iterate through all the object types. - int num_groups = mat->get_object_group_count(); - for (int j = 0; j < num_groups; j++) { - // Look up the random object. - SGMatModelGroup * group = mat->get_object_group(j); - - // Set up the range selector for the entire - // triangle; note that we use the object - // range plus the bounding radius here, to - // allow for objects far from the center. - float ranges[] = { 0, - group->get_range_m() + bounding_radius, - SG_MAX }; - ssgRangeSelector * lod = new ssgRangeSelector; - lod->setRanges(ranges, 3); - location->addKid(lod); - - // Create the in-range and out-of-range - // branches. - ssgBranch * in_range = new ssgBranch; - ssgBranch * out_of_range = new ssgBranch; - - // Set up the user data for if/when - // the random objects in this triangle - // are filled in. - SGTriUserData * data = new SGTriUserData; - data->is_filled_in = false; - data->p1 = p1; - data->p2 = p2; - data->p3 = p3; - sgCopyVec3 (data->center, center); - data->area = area; - data->object_group = group; - data->branch = in_range; - data->leafData = this; - data->seed = (unsigned int)(p1[0] * j); - - // Set up the in-range node. - in_range->setUserData(data); - in_range->setTravCallback(SSG_CALLBACK_PRETRAV, - tri_in_range_callback); - lod->addKid(in_range); - - // Set up the out-of-range node. - out_of_range->setUserData(data); - out_of_range->setTravCallback(SSG_CALLBACK_PRETRAV, - tri_out_of_range_callback); - out_of_range->addKid(new SGDummyBSphereEntity(bounding_radius)); - lod->addKid(out_of_range); - } -}