DI-Guy Graphics API, Immediate Mode with DI-Guy Loader Example

simple_playback_ogl.cpp

DI-Guy API Version 12.5.1

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

This example program loads and plays back a DI-Guy Scenario (.dss) file using immediate mode OpenGL calls and the DI-Guy geometry loader.

This example makes use of the following 3rdparty software to create a 3D graphics environment:

• freeglut : free implementation of the OpenGL Utility Toolkit
• glew : OpenGL Extensions Wrangler - manages looking up OpenGL extensions

#include <stdlib.h> #include <stdio.h> #include <diguy_graphics_api.h> #include <diguy_module_script_lua.h> #include <diguyApp.h> #include <diguyScenario.h> #include <diguyViewCamera.h> #include <diguyCharacter.h> #include <diguySceneObject.h> #include <libbdilog.h> #include "set_up_view.h" #include "diguyOglGraphicsLink.h" #include "diguyOglGraphicsShape.h" #include "diguyOglGraphicsMaterial.h" #include "diguyOglGraphicsTexture.h" #include "diguyOglGraphicsMesh.h" #include "diguyOglGraphicsShaderInstance.h" #include "diguyOglGraphicsShaderProgram.h" #include "diguyOglGraphicsShaderTechnique.h" #include <GL/glut.h> static double t = 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) {     char* arg_dss_filename;     void glut_idle_callback(void);     void glut_display_callback(void);     void glut_keyboard_callback(unsigned char key, int x, int y);     /*      * 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_DEBUG, "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];     else         arg_dss_filename = "example.dss";     /*      * Create a graphics window.      */     view_initialize();     /*      * Initialize glew, the GL Extension Wrangler library.      */     GLboolean glew_initialized = initialize_glew();     if (!glew_initialized)     {         exit(EXIT_FAILURE);     }     /*      * glew checks to see if required shader extensions are available. If      * they're not, skinned appearances will not work.      */     if (!s_shader_extension_available)     {         bdi_log_printf(BDI_LOG_WARN,             "WARNING: OpenGL shader extension not available; skinned "             "appearances not available.\n");     }     /*      * Set graphics object create functions. This has to be done before      * calling diguy_graphics_initialize().      */     diguy_graphics_set_link_create_func(diguyOglGraphicsLink_create_func);     diguy_graphics_set_shape_create_func(diguyOglGraphicsShape_create_func);     diguy_graphics_set_material_create_func(diguyOglGraphicsMaterial_create_func);     diguy_graphics_set_texture_create_func(diguyOglGraphicsTexture_create_func);     diguy_graphics_set_mesh_create_func(diguyOglGraphicsMesh_create_func);     diguy_graphics_set_shader_technique_create_func(diguyOglGraphicsShaderTechnique_create_func);     diguy_graphics_set_shader_program_create_func(diguyOglGraphicsShaderProgram_create_func);     diguy_graphics_set_shader_instance_create_func(diguyOglGraphicsShaderInstance_create_func);     /*      * Initialize DI-Guy.      */     bdiGraphicsInitGraphicsAPI graphics_init;     diguy_graphics_get_defaults(&graphics_init);     graphics_init.use_cached_compressed_textures = 1;     graphics_init.use_cached_optimized_geometry = 1;     graphics_init.use_shaders = 1;     graphics_init.use_linear_traversal_draw = 1;     if (diguy_graphics_initialize(&graphics_init))     {         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);     }     /*      * Enable scene objects.      */     scenario->set_scene_objects_enabled(1);     /*      * Uncomment to turn on asynchronous texture loading to demonstrate it.      */     //diguyCharacter::set_texture_load_behavior(DIGUY_LOAD_PRIORITY_ASYNC);     //diguySceneObject::set_texture_load_behavior(DIGUY_LOAD_PRIORITY_ASYNC);     /*      * Load the dss file.      */     scenario->load(arg_dss_filename);     /*      * Initialize the view and camera.      * Do this post scenario load to override scenario values      */     view_set_camera(scenario, 0.0f, 15.0f, 2.0f,         0.0f, 0.0f, 1.0f);     view_set_light(scenario, 0.7f, 0.7f, 1.0f);     /*      * 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 on a key press. Handle the key press.

void glut_keyboard_callback(unsigned char k, int /*x*/, int /*y*/) {     if (scenario)     {         switch (k)         {             case 27: // ESC             case 3: // ctrl c             case 'q':                 shutdown();                 break;         }     } }

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

void glut_idle_callback(void) {     /*      * Advance time.      */     t = view_get_time();     //t += 0.025;     if (scenario)     {         /*          * See if the scenario tout (T Out) is reached. If so, shut down.          */         if (t >= scenario->get_tout())             shutdown();                  /*          * Update the scenario to the current time.          */         scenario->update(t);     }     /*      * Tell glut that it should re-render.      */     glutPostRedisplay(); }

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

void glut_display_callback(void) {     glPushMatrix(); {         view_clear_screen();         if (scenario->get_num_scene_objects() == 0)             view_draw_background();         /*          * Tell the scenario to draw all of its characters, etc.          */         scenario->draw();     } glPopMatrix();     glutSwapBuffers(); }