[gtk+] Add tests/testglarea

[Matthias Clasen <matthiasc src gnome org>]

commit 3b3726ae5790a82a1e918da589bc6f724f6bd726
Author: Alexander Larsson <alexl redhat com>
Date:   Thu Oct 9 11:14:09 2014 +0200

    Add tests/testglarea
    
    This is a very simple test of GtkGLArea.

 tests/Makefile.am  |    1 +
 tests/testglarea.c |  159 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 160 insertions(+), 0 deletions(-)
---
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 78b9b29..ae022f2 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -69,6 +69,7 @@ noinst_PROGRAMS =  $(TEST_PROGS)      \
        testfullscreen                  \
        testgeometry                    \
        testgiconpixbuf                 \
+       testglarea                      \
        testgrid                        \
        testgtk                         \
        testheaderbar                   \
diff --git a/tests/testglarea.c b/tests/testglarea.c
new file mode 100644
index 0000000..23e5d8f
--- /dev/null
+++ b/tests/testglarea.c
@@ -0,0 +1,159 @@
+#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;
+}