160 lines
3.6 KiB
C
160 lines
3.6 KiB
C
#include <stdlib.h>
|
|
#include <gtk/gtk.h>
|
|
|
|
#include <epoxy/gl.h>
|
|
|
|
enum {
|
|
X_AXIS,
|
|
Y_AXIS,
|
|
Z_AXIS,
|
|
|
|
N_AXIS
|
|
};
|
|
|
|
static float rotation_angles[N_AXIS] = { 0.0 };
|
|
|
|
static GtkWidget *gl_area;
|
|
|
|
static void
|
|
draw_triangle (void)
|
|
{
|
|
glColor3f (1.0f, 0.85f, 0.35f);
|
|
glBegin (GL_TRIANGLES);
|
|
{
|
|
glVertex3f ( 0.0, 0.6, 0.0);
|
|
glVertex3f (-0.2, -0.3, 0.0);
|
|
glVertex3f ( 0.2, -0.3, 0.0);
|
|
}
|
|
glEnd ();
|
|
}
|
|
|
|
static gboolean
|
|
render (GtkGLArea *area,
|
|
GdkGLContext *context)
|
|
{
|
|
glClearColor (0.5, 0.5, 0.5, 1.0);
|
|
glClear (GL_COLOR_BUFFER_BIT);
|
|
|
|
glMatrixMode (GL_MODELVIEW);
|
|
glLoadIdentity ();
|
|
glRotatef (rotation_angles[X_AXIS], 1, 0, 0);
|
|
glRotatef (rotation_angles[Y_AXIS], 0, 1, 0);
|
|
glRotatef (rotation_angles[Z_AXIS], 0, 0, 1);
|
|
|
|
draw_triangle ();
|
|
|
|
glFlush ();
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
on_axis_value_change (GtkAdjustment *adjustment,
|
|
gpointer data)
|
|
{
|
|
int axis = GPOINTER_TO_INT (data);
|
|
|
|
if (axis < 0 || axis >= N_AXIS)
|
|
return;
|
|
|
|
rotation_angles[axis] = gtk_adjustment_get_value (adjustment);
|
|
|
|
gtk_widget_queue_draw (gl_area);
|
|
}
|
|
|
|
static GtkWidget *
|
|
create_axis_slider (int axis)
|
|
{
|
|
GtkWidget *box, *label, *slider;
|
|
GtkAdjustment *adj;
|
|
const char *text;
|
|
|
|
box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, FALSE);
|
|
|
|
switch (axis)
|
|
{
|
|
case X_AXIS:
|
|
text = "X axis";
|
|
break;
|
|
|
|
case Y_AXIS:
|
|
text = "Y axis";
|
|
break;
|
|
|
|
case Z_AXIS:
|
|
text = "Z axis";
|
|
break;
|
|
|
|
default:
|
|
g_assert_not_reached ();
|
|
}
|
|
|
|
label = gtk_label_new (text);
|
|
gtk_container_add (GTK_CONTAINER (box), label);
|
|
gtk_widget_show (label);
|
|
|
|
adj = gtk_adjustment_new (0.0, 0.0, 360.0, 1.0, 12.0, 0.0);
|
|
g_signal_connect (adj, "value-changed",
|
|
G_CALLBACK (on_axis_value_change),
|
|
GINT_TO_POINTER (axis));
|
|
slider = gtk_scale_new (GTK_ORIENTATION_HORIZONTAL, adj);
|
|
gtk_container_add (GTK_CONTAINER (box), slider);
|
|
gtk_widget_set_hexpand (slider, TRUE);
|
|
gtk_widget_show (slider);
|
|
|
|
gtk_widget_show (box);
|
|
|
|
return box;
|
|
}
|
|
|
|
int
|
|
main (int argc, char *argv[])
|
|
{
|
|
GtkWidget *window, *box, *button, *controls;
|
|
int i;
|
|
|
|
gtk_init (&argc, &argv);
|
|
|
|
/* create a new pixel format; we use this to configure the
|
|
* GL context, and to check for features
|
|
*/
|
|
|
|
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
|
|
gtk_window_set_title (GTK_WINDOW (window), "GtkGLArea - Golden Triangle");
|
|
gtk_window_set_default_size (GTK_WINDOW (window), 400, 400);
|
|
gtk_container_set_border_width (GTK_CONTAINER (window), 12);
|
|
g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
|
|
|
|
box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
|
|
gtk_box_set_spacing (GTK_BOX (box), 6);
|
|
gtk_container_add (GTK_CONTAINER (window), box);
|
|
gtk_widget_show (box);
|
|
|
|
gl_area = gtk_gl_area_new ();
|
|
gtk_widget_set_hexpand (gl_area, TRUE);
|
|
gtk_widget_set_vexpand (gl_area, TRUE);
|
|
gtk_container_add (GTK_CONTAINER (box), gl_area);
|
|
g_signal_connect (gl_area, "render", G_CALLBACK (render), NULL);
|
|
gtk_widget_show (gl_area);
|
|
|
|
controls = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
|
|
gtk_container_add (GTK_CONTAINER (box), controls);
|
|
gtk_widget_set_hexpand (controls, TRUE);
|
|
gtk_widget_show (controls);
|
|
|
|
for (i = 0; i < N_AXIS; i++)
|
|
gtk_container_add (GTK_CONTAINER (controls), create_axis_slider (i));
|
|
|
|
button = gtk_button_new_with_label ("Quit");
|
|
gtk_widget_set_hexpand (button, TRUE);
|
|
gtk_container_add (GTK_CONTAINER (box), button);
|
|
g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
|
|
gtk_widget_show (button);
|
|
|
|
gtk_widget_show (window);
|
|
|
|
gtk_main ();
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|