DI-Guy Graphics API, Scene Graph with External Loader Example

simple_playback_osg_2_ext.cpp

DI-Guy API Version 12.5.1

This file was automatically generated from simple_playback_osg_2_ext.cpp. Do not edit this file directly; the changes will be lost.

Note: Use of external loaders is being deprecated as of DI-Guy version 11. The format of data used for skinned appearances is much more restricted than that for static appearances. The loading of Collada .dae files using an External Loader often does not provide the data in a format that works for DI-Guy. Use of an External Loader for new development is not recommended!

This example program would load and plays back a DI-Guy Scenario (.dss) file using Open Scene Graph and the OSG geometry loader.

This example exists only as a code example. It currently does not run, as there is no external loader available in OSG that can load compressed DI-Guy geometry files.

#include <math.h> #include <osgViewer/Viewer> #include <osgViewer/ViewerEventHandlers> #include <osgGA/TrackballManipulator> #include <osgDB/ReadFile> osg::ref_ptr<osgViewer::Viewer> viewer; osg::observer_ptr<osgViewer::GraphicsWindow> window; #include <diguy_graphics_api.h> #include <diguy_module_script_lua.h> #include <diguyApp.h> #include <diguyScenario.h> #include <diguyViewCamera.h> #include <diguyCharacter.h> #include <libbdilog.h> #include "ogl_headers.h" #include "diguyOsgExtGraphicsLink.h" #include "diguyOsgExtGraphicsShape.h" #include "diguyOsgExtGraphicsFile.h" void view_init_time(const double start); double view_get_time();

const char* arg_set = "sets/default_stage/default_stage.flt"; const char* arg_dss_filename = "example.dss"; static double time_base = 0.0f; static double t = 0.0; static double t_prev = 0.0; static diguyScenario* scenario = NULL;

Initialize the 3D environment, the DI-Guy Graphics API, and various DI-Guy modules. Once initiailzed, start the main loop of the example.

int main(int argc, char** argv) {     void glut_idle_callback(void);     void glut_display_callback(void);     void glut_keyboard_callback(unsigned char key, int x, int y);     void shutdown(); bdi_log_printf(BDI_LOG_ERROR,     "\n\n"     "*********************************************************************\n"     "This example exists only as a code example. It currently does not\n"     "run, as there is no external loader available in OSG that can load\n"     "compressed DI-Guy geometry files.\n"     "*********************************************************************\n"     "\n\n"); exit(EXIT_SUCCESS);     /*      * These calls initialize the BDI logging mechanism. Log messages of      * priority BDI_LOG_DEBUG or higher get recorded into the file      * diguy_log.txt. Log messages of priority BDI_LOG_WARN or higher get      * printed on standard out.      */     bdi_log_file_enable(BDI_LOG_WARN, "diguy_log.txt", 1);     bdi_log_stdout_enable(BDI_LOG_WARN);     /*      * Decide which file to play back.      */     if (argc > 1)         arg_dss_filename = argv[1];     /*      * Set up window.      */     glutInit(&argc, argv);     glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH | GLUT_ALPHA);     glutInitWindowPosition(100, 100);     glutInitWindowSize(800, 600);     glutCreateWindow(argv[0]);     /*      * Create the OSG viewer.      */     viewer = new osgViewer::Viewer;     window = viewer->setUpViewerAsEmbeddedInWindow(100, 100, 800, 600);     //viewer->setCameraManipulator(new osgGA::TrackballManipulator);     viewer->addEventHandler(new osgViewer::StatsHandler);     viewer->realize();     /*      * Create a scene root node.      */     osg::ref_ptr<osg::Group> osg_diguy_attach_pt = new osg::Group();     osg::StateSet* state_set = new osg::StateSet;     osg_diguy_attach_pt->setStateSet(state_set);     /*      * Set graphics object create functions. This has to be done before      * calling diguy_graphics_initialize().      *      * Because we're using an external loader we override the      * diguyGraphicsFile class instead of diguyGraphcisMesh, etc.      *      * The Open Scene Graph .dae loader plugin does not read DI-Guy Collada      * files in a way that works with DI-Guy shaders, so skinned      * appearances will not be available in this example.      */     diguy_graphics_set_link_create_func(diguyOsgExtGraphicsLink_create_func);     diguy_graphics_set_shape_create_func(diguyOsgExtGraphicsShape_create_func);     diguy_graphics_set_file_create_func(diguyOsgExtGraphicsFile_create_func);     diguyOsgExtGraphicsLink::set_diguy_attach_ptr(osg_diguy_attach_pt);     viewer->setSceneData(osg_diguy_attach_pt);     /*      * Create a light.      */     osg::Light* light1 = new osg::Light;     light1->setLightNum(0);     light1->setPosition(osg::Vec4(1.0f, 1.0f, 1.0f, 0.0f));     light1->setAmbient(osg::Vec4(0.7f, 0.7f, 0.7f, 1.0f));     light1->setDiffuse(osg::Vec4(0.8f, 0.8f, 0.8f, 1.0f));     light1->setDirection(osg::Vec3(1.0f, 1.0f, -1.0f));     viewer->setLight(light1);     /*      * Initialize the view to look at the center of the scene graph.      */     osg::Matrix view_matrix;     view_matrix.makeLookAt(osg::Vec3(0.0f, 18.0f, 2.0f),         osg::Vec3(0.0f, 0.0f, 1.0f),         osg::Vec3(0.0f, 0.0f, 1.0f));     viewer->getCamera()->setViewMatrix(view_matrix);     /*      * Load a background.      */     diguyApp* app = diguyApp::get_app();     const char* geometry_dir = app->get_diguy_subdir_path("geometry");     char set_filename[512];     sprintf(set_filename, "%s/%s",         geometry_dir,         arg_set);     osg::ref_ptr<osg::Node> background_node = osgDB::readNodeFile(set_filename);     if (background_node != NULL)     {         osg_diguy_attach_pt->addChild(background_node);     }     else     {         bdi_log_printf(BDI_LOG_WARN,             "WARNING: Failed to load background set '%s'.\n",             set_filename);     }     /*      * Initialize DI-Guy.      */     if (diguy_graphics_initialize(NULL))     {         bdi_log_printf(BDI_LOG_ERROR, "DI-Guy failed to initialize.\n");         exit(EXIT_FAILURE);     }     /*      * Initialize the DI-Guy lua interpreter.      */     if (diguy_script_lua_initialize())     {         bdi_log_printf(BDI_LOG_WARN, "WARNING: DI-Guy lua interpreter failed to initialize.\n");     }     /*      * Create a scenario.      */     scenario = diguy_create_scenario();     if (!scenario)     {         bdi_log_printf(BDI_LOG_ERROR, "DI-Guy failed to create a scenario.\n");         exit(EXIT_FAILURE);     }     /*      * Disable scene objects.      */     scenario->set_scene_objects_enabled(0);     /*      * Load the dss file.      */     scenario->load(arg_dss_filename);     /*      * Start time now.      */     t = 0.0;     view_init_time(t);     /*      * Start the glut main loop.      */     glutIdleFunc(glut_idle_callback);     glutDisplayFunc(glut_display_callback);     glutKeyboardFunc(glut_keyboard_callback);     glutMainLoop();     return 0; }

Deinitialize all of DI-Guy and exit the program.

void shutdown() {     glutIdleFunc(NULL);     diguy_destroy_scenario(scenario);     diguy_script_lua_deinitialize();     diguy_deinitialize();     exit(EXIT_SUCCESS); }

Called by glut periodically, when not responding to other events. Advance simulation time and update DI-Guy.

void glut_idle_callback(void) {     t_prev = t;     t = view_get_time();     // debug timing uses fixed step dt     //t += 0.025;     if (scenario)     {         if (t >= scenario->get_tout())             shutdown();         scenario->update(t);     }     glutPostRedisplay(); }

Called by glut when it's time to re-render.

void glut_display_callback(void) {     glPushMatrix(); {         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);         scenario->draw();     } glPopMatrix();     if (viewer.valid())         viewer->frame();     glutSwapBuffers(); }

Called by glut on a key press. Handle the key press.

void glut_keyboard_callback(unsigned char key, int /*x*/, int /*y*/) {     switch (key)     {         case 'q':         case 27:             shutdown();             break;         default:             if (window.valid())             {                 window->getEventQueue()->keyPress((osgGA::GUIEventAdapter::KeySymbol) key);                 window->getEventQueue()->keyRelease((osgGA::GUIEventAdapter::KeySymbol) key);             }             break;     } }

Initialize time clock. Subsequent calls to view_get_time() will return times relative to the current time.

static double time_base_double; struct timeval time_base_struct; void view_init_time(const double start) { #if BDI_OS_TYPE_win32     time_base_double = (timeGetTime() / 1000.0) - start; #else     struct timezone time_zone_struct;     gettimeofday(&time_base_struct, &time_zone_struct);     time_base_double = start; #endif }

Return current time relative to base time computed in view_init_time().

double view_get_time() { #if BDI_OS_TYPE_win32     double time_now = (double) (timeGetTime() / 1000.0);     return time_now - time_base_double; #else     struct timeval now;     struct timezone time_zone_struct;     gettimeofday(&now, &time_zone_struct);     return (time_base_double         + (double)(now.tv_sec - time_base_struct.tv_sec)         + 0.000001 * (double)(now.tv_usec - time_base_struct.tv_usec)); #endif }