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/*
* This file is part of MXE. See LICENSE.md for licensing information.
*/
#include <gtk/gtk.h>
#include <gtk/gtkgl.h>
#include <GL/gl.h>
static gboolean eventExpose(GtkWidget *gl, GdkEventExpose *e, gpointer userData)
{
GdkGLContext *ctx = gtk_widget_get_gl_context(gl);
GdkGLDrawable *drawable = gtk_widget_get_gl_drawable(gl);
(void)e;
(void)userData;
gdk_gl_drawable_gl_begin(drawable, ctx);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
if (!gdk_gl_drawable_is_double_buffered(drawable))
glFinish();
else
gdk_gl_drawable_swap_buffers(drawable);
gdk_gl_drawable_gl_end(drawable);
return TRUE;
}
static gboolean eventConfigure(GtkWidget *gl, GdkEventConfigure *e, gpointer userData)
{
const guint width = gl->allocation.width;
const guint height = gl->allocation.height;
(void)e;
(void)userData;
glLoadIdentity();
glViewport(0, 0, width, height);
glOrtho(-3.5, 3.5, -3.5 * (GLfloat)height / (GLfloat)width,
3.5 * (GLfloat)height / (GLfloat)width, -3.5, 3.5);
return TRUE;
}
int main(int argc, char *argv[])
{
GtkWidget* window;
GtkWidget* gl;
GdkGLConfig* glConfig;
gtk_init(&argc, &argv);
gtk_gl_init(&argc, &argv);
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gl = gtk_drawing_area_new();
gtk_container_add(GTK_CONTAINER(window), gl);
gtk_widget_set_events(gl, GDK_EXPOSURE_MASK);
glConfig = gdk_gl_config_new_by_mode(
GDK_GL_MODE_RGB |
GDK_GL_MODE_ALPHA |
GDK_GL_MODE_DEPTH |
GDK_GL_MODE_DOUBLE);
gtk_widget_set_gl_capability(gl, glConfig,
NULL, TRUE, GDK_GL_RGBA_TYPE);
g_signal_connect_swapped(
G_OBJECT(window), "destroy",
G_CALLBACK(gtk_main_quit), G_OBJECT(window));
g_signal_connect(
G_OBJECT(window), "destroy",
G_CALLBACK(gtk_main_quit), NULL);
g_signal_connect(gl, "configure-event",
G_CALLBACK(eventConfigure), NULL);
g_signal_connect(gl, "expose-event",
G_CALLBACK(eventExpose), NULL);
gtk_widget_show_all(window);
gtk_main();
return 0;
}
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