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// -*- C++ -*-
/*
* simple.cc:
* Simple gtkglextmm example.
*
* written by Naofumi Yasufuku <naofumi@users.sourceforge.net>
*/
#include <iostream>
#include <cstdlib>
#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;
}
//
// Simple OpenGL scene.
//
class SimpleGLScene : public Gtk::DrawingArea,
public Gtk::GL::Widget<SimpleGLScene>
{
public:
SimpleGLScene();
virtual ~SimpleGLScene();
protected:
virtual void on_realize();
virtual bool on_configure_event(GdkEventConfigure* event);
virtual bool on_expose_event(GdkEventExpose* event);
};
SimpleGLScene::SimpleGLScene()
{
//
// 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);
}
SimpleGLScene::~SimpleGLScene()
{
}
void SimpleGLScene::on_realize()
{
// We need to call the base on_realize()
Gtk::DrawingArea::on_realize();
//
// Get GL::Window.
//
Glib::RefPtr<Gdk::GL::Window> glwindow = get_gl_window();
//
// GL calls.
//
// *** OpenGL BEGIN ***
if (!glwindow->gl_begin(get_gl_context()))
return;
GLUquadricObj* qobj = gluNewQuadric();
gluQuadricDrawStyle(qobj, GLU_FILL);
glNewList(1, GL_COMPILE);
gluSphere(qobj, 1.0, 20, 20);
glEndList();
static GLfloat light_diffuse[] = {1.0, 0.0, 0.0, 1.0};
static GLfloat light_position[] = {1.0, 1.0, 1.0, 0.0};
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_DEPTH_TEST);
glClearColor(1.0, 1.0, 1.0, 1.0);
glClearDepth(1.0);
glViewport(0, 0, get_width(), get_height());
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(40.0, 1.0, 1.0, 10.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(0.0, 0.0, 3.0,
0.0, 0.0, 0.0,
0.0, 1.0, 0.0);
glTranslatef(0.0, 0.0, -3.0);
glwindow->gl_end();
// *** OpenGL END ***
}
bool SimpleGLScene::on_configure_event(GdkEventConfigure* event)
{
//
// Get GL::Window.
//
Glib::RefPtr<Gdk::GL::Window> glwindow = get_gl_window();
//
// GL calls.
//
// *** OpenGL BEGIN ***
if (!glwindow->gl_begin(get_gl_context()))
return false;
glViewport(0, 0, get_width(), get_height());
glwindow->gl_end();
// *** OpenGL END ***
return true;
}
bool SimpleGLScene::on_expose_event(GdkEventExpose* event)
{
//
// Get GL::Window.
//
Glib::RefPtr<Gdk::GL::Window> glwindow = get_gl_window();
//
// GL calls.
//
// *** OpenGL BEGIN ***
if (!glwindow->gl_begin(get_gl_context()))
return false;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glCallList(1);
// Swap buffers.
if (glwindow->is_double_buffered())
glwindow->swap_buffers();
else
glFlush();
glwindow->gl_end();
// *** OpenGL END ***
return true;
}
//
// The application class.
//
class Simple : public Gtk::Window
{
public:
Simple();
virtual ~Simple();
protected:
// signal handlers:
void on_button_quit_clicked();
protected:
// member widgets:
Gtk::VBox m_VBox;
SimpleGLScene m_SimpleGLScene;
Gtk::Button m_ButtonQuit;
};
Simple::Simple()
: m_VBox(false, 0), m_ButtonQuit("Quit")
{
//
// Top-level window.
//
set_title("Simple");
// Get automatically redrawn if any of their children changed allocation.
set_reallocate_redraws(true);
add(m_VBox);
//
// Simple OpenGL scene.
//
m_SimpleGLScene.set_size_request(200, 200);
m_VBox.pack_start(m_SimpleGLScene);
//
// Simple quit button.
//
m_ButtonQuit.signal_clicked().connect(
sigc::mem_fun(*this, &Simple::on_button_quit_clicked));
m_VBox.pack_start(m_ButtonQuit, Gtk::PACK_SHRINK, 0);
//
// Show window.
//
show_all();
}
Simple::~Simple()
{}
void Simple::on_button_quit_clicked()
{
Gtk::Main::quit();
}
//
// Main.
//
int main(int argc, char** argv)
{
Gtk::Main kit(argc, argv);
//
// Init gtkglextmm.
//
Gtk::GL::init(argc, argv);
//
// Query OpenGL extension version.
//
int major, minor;
Gdk::GL::query_version(major, minor);
std::cout << "OpenGL extension version - "
<< major << "." << minor << std::endl;
//
// Instantiate and run the application.
//
Simple simple;
kit.run(simple);
return 0;
}
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