From d4979fb82ad0357265fe28130a2d5b7459837dc6 Mon Sep 17 00:00:00 2001 From: Alexander Larsson Date: Thu, 9 Oct 2014 11:25:50 +0200 Subject: [PATCH] Add glarea demo to gtk3-demo --- demos/gtk-demo/Makefile.am | 1 + demos/gtk-demo/demo.gresource.xml | 1 + demos/gtk-demo/glarea.c | 184 ++++++++++++++++++++++++++++++ 3 files changed, 186 insertions(+) create mode 100644 demos/gtk-demo/glarea.c diff --git a/demos/gtk-demo/Makefile.am b/demos/gtk-demo/Makefile.am index 6b0b8da6a6..de150dceca 100644 --- a/demos/gtk-demo/Makefile.am +++ b/demos/gtk-demo/Makefile.am @@ -25,6 +25,7 @@ demos = \ event_axes.c \ expander.c \ gestures.c \ + glarea.c \ headerbar.c \ hypertext.c \ iconview.c \ diff --git a/demos/gtk-demo/demo.gresource.xml b/demos/gtk-demo/demo.gresource.xml index e9c628dbf3..d861199277 100644 --- a/demos/gtk-demo/demo.gresource.xml +++ b/demos/gtk-demo/demo.gresource.xml @@ -95,6 +95,7 @@ expander.c flowbox.c gestures.c + glarea.c headerbar.c hypertext.c iconview.c diff --git a/demos/gtk-demo/glarea.c b/demos/gtk-demo/glarea.c new file mode 100644 index 0000000000..8ac5b3771b --- /dev/null +++ b/demos/gtk-demo/glarea.c @@ -0,0 +1,184 @@ +/* OpenGL Area + * + * GtkGLArea is a widget that allows custom drawing using OpenGL calls. + */ + +#include +#include + +static GtkWidget *demo_window = NULL; + +/* the GtkGLArea widget */ +static GtkWidget *gl_area = NULL; + +enum { + X_AXIS, + Y_AXIS, + Z_AXIS, + + N_AXIS +}; + +/* Rotation angles on each axis */ +static float rotation_angles[N_AXIS] = { 0.0 }; + +/* The object we are drawing */ +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 (); +} + +/* The main rendering callback */ +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); + + g_assert (axis >= 0 && axis < N_AXIS); + + /* Update the rotation angle */ + rotation_angles[axis] = gtk_adjustment_get_value (adjustment); + + /* Update the contents of the GL drawing area */ + 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; +} + +static void +close_window (GtkWidget *widget) +{ + /* Reset the state */ + demo_window = NULL; + gl_area = NULL; + + rotation_angles[X_AXIS] = 0.0; + rotation_angles[Y_AXIS] = 0.0; + rotation_angles[Z_AXIS] = 0.0; +} + +GtkWidget * +create_glarea_window (GtkWidget *do_widget) +{ + GtkWidget *window, *box, *button, *controls; + int i; + + window = gtk_window_new (GTK_WINDOW_TOPLEVEL); + gtk_window_set_screen (GTK_WINDOW (window), gtk_widget_get_screen (do_widget)); + 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 (close_window), NULL); + + box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE); + gtk_box_set_spacing (GTK_BOX (box), 6); + gtk_container_add (GTK_CONTAINER (window), 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); + + /* the main "draw" call for GtkGLArea */ + g_signal_connect (gl_area, "render", G_CALLBACK (render), NULL); + + controls = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE); + gtk_container_add (GTK_CONTAINER (box), controls); + gtk_widget_set_hexpand (controls, TRUE); + + 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); + + return window; +} + +GtkWidget* +do_glarea (GtkWidget *do_widget) +{ + if (demo_window == NULL) + demo_window = create_glarea_window (do_widget); + + if (!gtk_widget_get_visible (demo_window)) + gtk_widget_show_all (demo_window); + else + gtk_widget_destroy (demo_window); + + return demo_window; +}