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