// -*- C++ -*- /* * 3-D gear wheels. This program is in the public domain. * * Brian Paul */ /* Conversion to gtkglextmm by Naofumi Yasufuku */ #include <iostream> #include <cstdlib> #include <cmath> #include <gtkmm.h> #include <gtkglmm.h> #ifdef G_OS_WIN32 #define WIN32_LEAN_AND_MEAN 1 #include <windows.h> #endif #include <GL/gl.h> #include <GL/glu.h> // // OpenGL frame buffer configuration utilities. // struct GLConfigUtil { static void print_gl_attrib(const Glib::RefPtr<const Gdk::GL::Config>& glconfig, const char* attrib_str, int attrib, bool is_boolean); static void examine_gl_attrib(const Glib::RefPtr<const Gdk::GL::Config>& glconfig); }; // // Print a configuration attribute. // void GLConfigUtil::print_gl_attrib(const Glib::RefPtr<const Gdk::GL::Config>& glconfig, const char* attrib_str, int attrib, bool is_boolean) { int value; if (glconfig->get_attrib(attrib, value)) { std::cout << attrib_str << " = "; if (is_boolean) std::cout << (value == true ? "true" : "false") << std::endl; else std::cout << value << std::endl; } else { std::cout << "*** Cannot get " << attrib_str << " attribute value\n"; } } // // Print configuration attributes. // void GLConfigUtil::examine_gl_attrib(const Glib::RefPtr<const Gdk::GL::Config>& glconfig) { std::cout << "\nOpenGL visual configurations :\n\n"; std::cout << "glconfig->is_rgba() = " << (glconfig->is_rgba() ? "true" : "false") << std::endl; std::cout << "glconfig->is_double_buffered() = " << (glconfig->is_double_buffered() ? "true" : "false") << std::endl; std::cout << "glconfig->is_stereo() = " << (glconfig->is_stereo() ? "true" : "false") << std::endl; std::cout << "glconfig->has_alpha() = " << (glconfig->has_alpha() ? "true" : "false") << std::endl; std::cout << "glconfig->has_depth_buffer() = " << (glconfig->has_depth_buffer() ? "true" : "false") << std::endl; std::cout << "glconfig->has_stencil_buffer() = " << (glconfig->has_stencil_buffer() ? "true" : "false") << std::endl; std::cout << "glconfig->has_accum_buffer() = " << (glconfig->has_accum_buffer() ? "true" : "false") << std::endl; std::cout << std::endl; print_gl_attrib(glconfig, "Gdk::GL::USE_GL", Gdk::GL::USE_GL, true); print_gl_attrib(glconfig, "Gdk::GL::BUFFER_SIZE", Gdk::GL::BUFFER_SIZE, false); print_gl_attrib(glconfig, "Gdk::GL::LEVEL", Gdk::GL::LEVEL, false); print_gl_attrib(glconfig, "Gdk::GL::RGBA", Gdk::GL::RGBA, true); print_gl_attrib(glconfig, "Gdk::GL::DOUBLEBUFFER", Gdk::GL::DOUBLEBUFFER, true); print_gl_attrib(glconfig, "Gdk::GL::STEREO", Gdk::GL::STEREO, true); print_gl_attrib(glconfig, "Gdk::GL::AUX_BUFFERS", Gdk::GL::AUX_BUFFERS, false); print_gl_attrib(glconfig, "Gdk::GL::RED_SIZE", Gdk::GL::RED_SIZE, false); print_gl_attrib(glconfig, "Gdk::GL::GREEN_SIZE", Gdk::GL::GREEN_SIZE, false); print_gl_attrib(glconfig, "Gdk::GL::BLUE_SIZE", Gdk::GL::BLUE_SIZE, false); print_gl_attrib(glconfig, "Gdk::GL::ALPHA_SIZE", Gdk::GL::ALPHA_SIZE, false); print_gl_attrib(glconfig, "Gdk::GL::DEPTH_SIZE", Gdk::GL::DEPTH_SIZE, false); print_gl_attrib(glconfig, "Gdk::GL::STENCIL_SIZE", Gdk::GL::STENCIL_SIZE, false); print_gl_attrib(glconfig, "Gdk::GL::ACCUM_RED_SIZE", Gdk::GL::ACCUM_RED_SIZE, false); print_gl_attrib(glconfig, "Gdk::GL::ACCUM_GREEN_SIZE", Gdk::GL::ACCUM_GREEN_SIZE, false); print_gl_attrib(glconfig, "Gdk::GL::ACCUM_BLUE_SIZE", Gdk::GL::ACCUM_BLUE_SIZE, false); print_gl_attrib(glconfig, "Gdk::GL::ACCUM_ALPHA_SIZE", Gdk::GL::ACCUM_ALPHA_SIZE, false); std::cout << std::endl; } // // Gears scene. // class GearsScene : public Gtk::GL::DrawingArea { public: explicit GearsScene(bool is_sync = true); virtual ~GearsScene(); protected: void gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width, GLint teeth, GLfloat tooth_depth); protected: // signal handlers: virtual void on_realize(); virtual bool on_configure_event(GdkEventConfigure* event); virtual bool on_expose_event(GdkEventExpose* event); virtual bool on_map_event(GdkEventAny* event); virtual bool on_unmap_event(GdkEventAny* event); virtual bool on_visibility_notify_event(GdkEventVisibility* event); virtual bool on_idle(); public: // Invalidate whole window. void invalidate() { get_window()->invalidate_rect(get_allocation(), false); } // Update window synchronously (fast). void update() { get_window()->process_updates(false); } protected: // idle signal connection: sigc::connection m_ConnectionIdle; public: // get & set view rotation values. void get_view_rot(GLfloat& x, GLfloat& y, GLfloat& z) { x = m_ViewRotX; y = m_ViewRotY; z = m_ViewRotZ; } void set_view_rot(GLfloat x, GLfloat y, GLfloat z) { m_ViewRotX = x; m_ViewRotY = y; m_ViewRotZ = z; } protected: // OpenGL scene related variables: GLint m_Gear1; GLint m_Gear2; GLint m_Gear3; GLfloat m_ViewRotX; GLfloat m_ViewRotY; GLfloat m_ViewRotZ; GLfloat m_Angle; bool m_IsSync; protected: // frame rate evaluation stuff: Glib::Timer m_Timer; int m_Frames; }; GearsScene::GearsScene(bool is_sync) : m_Gear1(0), m_Gear2(0), m_Gear3(0), m_ViewRotX(20.0), m_ViewRotY(30.0), m_ViewRotZ(0.0), m_Angle(0.0), m_IsSync(is_sync), m_Frames(0) { // // Configure OpenGL-capable visual. // Glib::RefPtr<Gdk::GL::Config> glconfig; // Try double-buffered visual glconfig = Gdk::GL::Config::create(Gdk::GL::MODE_RGB | Gdk::GL::MODE_DEPTH | Gdk::GL::MODE_DOUBLE); if (!glconfig) { std::cerr << "*** Cannot find the double-buffered visual.\n" << "*** Trying single-buffered visual.\n"; // Try single-buffered visual glconfig = Gdk::GL::Config::create(Gdk::GL::MODE_RGB | Gdk::GL::MODE_DEPTH); if (!glconfig) { std::cerr << "*** Cannot find any OpenGL-capable visual.\n"; std::exit(1); } } // print frame buffer attributes. GLConfigUtil::examine_gl_attrib(glconfig); // // Set OpenGL-capability to the widget. // set_gl_capability(glconfig); // Add events. add_events(Gdk::VISIBILITY_NOTIFY_MASK); } GearsScene::~GearsScene() { } /* * Draw a gear wheel. You'll probably want to call this function when * building a display list since we do a lot of trig here. * * Input: inner_radius - radius of hole at center * outer_radius - radius at center of teeth * width - width of gear * teeth - number of teeth * tooth_depth - depth of tooth */ void GearsScene::gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width, GLint teeth, GLfloat tooth_depth) { GLint i; GLfloat r0, r1, r2; GLfloat angle, da; GLfloat u, v, len; r0 = inner_radius; r1 = outer_radius - tooth_depth / 2.0; r2 = outer_radius + tooth_depth / 2.0; da = 2.0 * G_PI / teeth / 4.0; glShadeModel(GL_FLAT); glNormal3f(0.0, 0.0, 1.0); /* draw front face */ glBegin(GL_QUAD_STRIP); for (i = 0; i <= teeth; i++) { angle = i * 2.0 * G_PI / teeth; glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5); glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5); if (i < teeth) { glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5); glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5); } } glEnd(); /* draw front sides of teeth */ glBegin(GL_QUADS); da = 2.0 * G_PI / teeth / 4.0; for (i = 0; i < teeth; i++) { angle = i * 2.0 * G_PI / teeth; glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5); glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5); glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), width * 0.5); glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5); } glEnd(); glNormal3f(0.0, 0.0, -1.0); /* draw back face */ glBegin(GL_QUAD_STRIP); for (i = 0; i <= teeth; i++) { angle = i * 2.0 * G_PI / teeth; glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5); glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5); if (i < teeth) { glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5); glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5); } } glEnd(); /* draw back sides of teeth */ glBegin(GL_QUADS); da = 2.0 * G_PI / teeth / 4.0; for (i = 0; i < teeth; i++) { angle = i * 2.0 * G_PI / teeth; glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5); glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -width * 0.5); glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5); glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5); } glEnd(); /* draw outward faces of teeth */ glBegin(GL_QUAD_STRIP); for (i = 0; i < teeth; i++) { angle = i * 2.0 * G_PI / teeth; glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5); glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5); u = r2 * cos(angle + da) - r1 * cos(angle); v = r2 * sin(angle + da) - r1 * sin(angle); len = sqrt(u * u + v * v); u /= len; v /= len; glNormal3f(v, -u, 0.0); glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5); glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5); glNormal3f(cos(angle), sin(angle), 0.0); glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), width * 0.5); glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -width * 0.5); u = r1 * cos(angle + 3 * da) - r2 * cos(angle + 2 * da); v = r1 * sin(angle + 3 * da) - r2 * sin(angle + 2 * da); glNormal3f(v, -u, 0.0); glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5); glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5); glNormal3f(cos(angle), sin(angle), 0.0); } glVertex3f(r1 * cos(0), r1 * sin(0), width * 0.5); glVertex3f(r1 * cos(0), r1 * sin(0), -width * 0.5); glEnd(); glShadeModel(GL_SMOOTH); /* draw inside radius cylinder */ glBegin(GL_QUAD_STRIP); for (i = 0; i <= teeth; i++) { angle = i * 2.0 * G_PI / teeth; glNormal3f(-cos(angle), -sin(angle), 0.0); glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5); glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5); } glEnd(); } void GearsScene::on_realize() { // We need to call the base on_realize() Gtk::DrawingArea::on_realize(); // // Get GL::Drawable. // Glib::RefPtr<Gdk::GL::Drawable> gldrawable = get_gl_drawable(); // // GL calls. // // *** OpenGL BEGIN *** if (!gldrawable->gl_begin(get_gl_context())) return; static GLfloat pos[4] = {5.0, 5.0, 10.0, 0.0}; static GLfloat red[4] = {0.8, 0.1, 0.0, 1.0}; static GLfloat green[4] = {0.0, 0.8, 0.2, 1.0}; static GLfloat blue[4] = {0.2, 0.2, 1.0, 1.0}; glLightfv(GL_LIGHT0, GL_POSITION, pos); glEnable(GL_CULL_FACE); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); glEnable(GL_DEPTH_TEST); // Make the gears. m_Gear1 = glGenLists(1); glNewList(m_Gear1, GL_COMPILE); glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red); gear(1.0, 4.0, 1.0, 20, 0.7); glEndList(); m_Gear2 = glGenLists(1); glNewList(m_Gear2, GL_COMPILE); glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green); gear(0.5, 2.0, 2.0, 10, 0.7); glEndList(); m_Gear3 = glGenLists(1); glNewList(m_Gear3, GL_COMPILE); glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue); gear(1.3, 2.0, 0.5, 10, 0.7); glEndList(); glEnable(GL_NORMALIZE); std::cout << "GL_RENDERER = " << glGetString(GL_RENDERER) << std::endl; std::cout << "GL_VERSION = " << glGetString(GL_VERSION) << std::endl; std::cout << "GL_VENDOR = " << glGetString(GL_VENDOR) << std::endl; std::cout << "GL_EXTENSIONS = " << glGetString(GL_EXTENSIONS) << std::endl; std::cout << std::endl; gldrawable->gl_end(); // *** OpenGL END *** // Start timer. m_Timer.start(); } bool GearsScene::on_configure_event(GdkEventConfigure* event) { // // Get GL::Drawable. // Glib::RefPtr<Gdk::GL::Drawable> gldrawable = get_gl_drawable(); // // GL calls. // // *** OpenGL BEGIN *** if (!gldrawable->gl_begin(get_gl_context())) return false; GLfloat h = (GLfloat)(get_height()) / (GLfloat)(get_width()); glViewport(0, 0, get_width(), get_height()); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glFrustum(-1.0, 1.0, -h, h, 5.0, 60.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glTranslatef(0.0, 0.0, -40.0); gldrawable->gl_end(); // *** OpenGL END *** return true; } bool GearsScene::on_expose_event(GdkEventExpose* event) { // // Get GL::Drawable. // Glib::RefPtr<Gdk::GL::Drawable> gldrawable = get_gl_drawable(); // // GL calls. // // *** OpenGL BEGIN *** if (!gldrawable->gl_begin(get_gl_context())) return false; glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glPushMatrix(); glRotatef(m_ViewRotX, 1.0, 0.0, 0.0); glRotatef(m_ViewRotY, 0.0, 1.0, 0.0); glRotatef(m_ViewRotZ, 0.0, 0.0, 1.0); glPushMatrix(); glTranslatef(-3.0, -2.0, 0.0); glRotatef(m_Angle, 0.0, 0.0, 1.0); glCallList(m_Gear1); glPopMatrix(); glPushMatrix(); glTranslatef(3.1, -2.0, 0.0); glRotatef(-2.0 * m_Angle - 9.0, 0.0, 0.0, 1.0); glCallList(m_Gear2); glPopMatrix(); glPushMatrix(); glTranslatef(-3.1, 4.2, 0.0); glRotatef(-2.0 * m_Angle - 25.0, 0.0, 0.0, 1.0); glCallList(m_Gear3); glPopMatrix(); glPopMatrix(); // Swap buffers. if (gldrawable->is_double_buffered()) gldrawable->swap_buffers(); else glFlush(); gldrawable->gl_end(); // *** OpenGL END *** // // Print frame rate. // ++m_Frames; double seconds = m_Timer.elapsed(); if (seconds >= 5.0) { // std::cout.setf(std::ios_base::fixed, std::ios_base::floatfield); std::cout.setf(std::ios::fixed, std::ios::floatfield); std::cout.precision(3); std::cout << m_Frames << " frames in " << seconds << " seconds = " << (m_Frames / seconds) << " FPS\n"; m_Timer.reset(); m_Frames = 0; } return true; } bool GearsScene::on_map_event(GdkEventAny* event) { if (!m_ConnectionIdle.connected()) m_ConnectionIdle = Glib::signal_idle().connect( sigc::mem_fun(*this, &GearsScene::on_idle), GDK_PRIORITY_REDRAW); return true; } bool GearsScene::on_unmap_event(GdkEventAny* event) { if (m_ConnectionIdle.connected()) m_ConnectionIdle.disconnect(); return true; } bool GearsScene::on_visibility_notify_event(GdkEventVisibility* event) { if (event->state == GDK_VISIBILITY_FULLY_OBSCURED) { if (m_ConnectionIdle.connected()) m_ConnectionIdle.disconnect(); } else { if (!m_ConnectionIdle.connected()) m_ConnectionIdle = Glib::signal_idle().connect( sigc::mem_fun(*this, &GearsScene::on_idle), GDK_PRIORITY_REDRAW); } return true; } bool GearsScene::on_idle() { m_Angle += 2.0; // Invalidate the whole window. invalidate(); // Update window synchronously (fast). if (m_IsSync) update(); return true; } // // The application class. // class Gears : public Gtk::Window { public: explicit Gears(bool is_sync = true); virtual ~Gears(); protected: // signal handlers: void on_button_quit_clicked(); virtual bool on_key_press_event(GdkEventKey* event); protected: // member widgets: Gtk::VBox m_VBox; GearsScene m_GearsScene; Gtk::Button m_ButtonQuit; }; Gears::Gears(bool is_sync) : m_VBox(false, 0), m_GearsScene(is_sync), m_ButtonQuit("Quit") { // // Top-level window. // set_title("Gears"); // Get automatically redrawn if any of their children changed allocation. set_reallocate_redraws(true); add(m_VBox); // // Gears scene. // m_GearsScene.set_size_request(300, 300); m_VBox.pack_start(m_GearsScene); // // Simple quit button. // m_ButtonQuit.signal_clicked().connect( sigc::mem_fun(*this, &Gears::on_button_quit_clicked)); m_VBox.pack_start(m_ButtonQuit, Gtk::PACK_SHRINK, 0); // // Show window. // show_all(); } Gears::~Gears() { } void Gears::on_button_quit_clicked() { Gtk::Main::quit(); } bool Gears::on_key_press_event(GdkEventKey* event) { GLfloat x, y, z; m_GearsScene.get_view_rot(x, y, z); switch (event->keyval) { case GDK_z: z += 5.0; break; case GDK_Z: z -= 5.0; break; case GDK_Up: x += 5.0; break; case GDK_Down: x -= 5.0; break; case GDK_Left: y += 5.0; break; case GDK_Right: y -= 5.0; break; case GDK_Escape: Gtk::Main::quit(); break; default: return true; } m_GearsScene.set_view_rot(x, y, z); m_GearsScene.invalidate(); return true; } // // Main. // int main(int argc, char** argv) { Gtk::Main kit(argc, argv); // // Init gtkglextmm. // Gtk::GL::init(argc, argv); // // Parse arguments. // bool is_sync = true; for (int i = 1; i < argc; ++i) { if (std::strcmp(argv[i], "--async") == 0) is_sync = false; } // // Instantiate and run the application. // Gears gears(is_sync); kit.run(gears); return 0; }