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author | Emmanuele Bassi <ebassi@gnome.org> | 2014-08-18 17:55:51 +0100 |
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committer | Emmanuele Bassi <ebassi@gnome.org> | 2014-08-18 17:55:51 +0100 |
commit | 78f84f42c5051f65b3ad0ac9df0196b97c92b743 (patch) | |
tree | 233dc0a20d485e51b5cd18a6b9caf9a1c2629149 | |
parent | 06d48d0e9acfa974c75456eed6e83ff66823070c (diff) | |
download | gtk+-78f84f42c5051f65b3ad0ac9df0196b97c92b743.tar.gz |
demos: Add GtkGLArea to gtk-demo
-rw-r--r-- | demos/gtk-demo/Makefile.am | 1 | ||||
-rw-r--r-- | demos/gtk-demo/demo.gresource.xml | 1 | ||||
-rw-r--r-- | demos/gtk-demo/glarea.c | 230 |
3 files changed, 232 insertions, 0 deletions
diff --git a/demos/gtk-demo/Makefile.am b/demos/gtk-demo/Makefile.am index 4eb3914161..8d5a4f4ace 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 4f90eb4d1e..3e21db3be6 100644 --- a/demos/gtk-demo/demo.gresource.xml +++ b/demos/gtk-demo/demo.gresource.xml @@ -95,6 +95,7 @@ <file>expander.c</file> <file>flowbox.c</file> <file>gestures.c</file> + <file>glarea.c</file> <file>headerbar.c</file> <file>hypertext.c</file> <file>iconview.c</file> diff --git a/demos/gtk-demo/glarea.c b/demos/gtk-demo/glarea.c new file mode 100644 index 0000000000..e5390ee922 --- /dev/null +++ b/demos/gtk-demo/glarea.c @@ -0,0 +1,230 @@ +/* OpenGL Area + * + * GtkGLArea is a widget that allows custom drawing using OpenGL calls. + */ + +#include <gtk/gtk.h> +#include <epoxy/gl.h> + +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; +} + +/* Initialize the GL state */ +static void +init_gl_state (GtkWidget *widget) +{ + GdkGLContext *context = gtk_gl_area_get_context (GTK_GL_AREA (widget)); + GdkGLPixelFormat *format = gdk_gl_context_get_pixel_format (context); + + g_print ("GL Pixel format:\n" + " - double-buffer: %s\n" + " - multi-sample: %s\n" + " - stereo: %s\n" + " - color-size: %d, alpha-size: %d\n" + " - depth-size: %d\n" + " - stencil-size: %d\n" + " - aux-buffers: %d\n" + " - accum-size: %d\n" + " - sample-buffers: %d\n" + " - samples: %d\n\n", + gdk_gl_pixel_format_get_double_buffer (format) ? "yes" : "no", + gdk_gl_pixel_format_get_multi_sample (format) ? "yes" : "no", + gdk_gl_pixel_format_get_stereo (format) ? "yes" : "no", + gdk_gl_pixel_format_get_color_size (format), + gdk_gl_pixel_format_get_alpha_size (format), + gdk_gl_pixel_format_get_depth_size (format), + gdk_gl_pixel_format_get_stencil_size (format), + gdk_gl_pixel_format_get_aux_buffers (format), + gdk_gl_pixel_format_get_accum_size (format), + gdk_gl_pixel_format_get_sample_buffers (format), + gdk_gl_pixel_format_get_samples (format)); +} + +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; + GdkGLPixelFormat *pixel_format; + 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); + + /* Create a new pixel format; we use this to configure the + * GL context, and to check for features. + * + * We only need it to be double-buffered. + */ + pixel_format = gdk_gl_pixel_format_new ("double-buffer", TRUE, NULL); + + gl_area = gtk_gl_area_new (pixel_format); + gtk_widget_set_hexpand (gl_area, TRUE); + gtk_widget_set_vexpand (gl_area, TRUE); + gtk_container_add (GTK_CONTAINER (box), gl_area); + + /* we use ::realize to initialize our GL state, because at that + * point we know that the GtkGLArea is associated with windowing + * system resources like a display, window, and GL context. + */ + g_signal_connect (gl_area, "realize", G_CALLBACK (init_gl_state), NULL); + + /* the main "draw" call for GtkGLArea */ + g_signal_connect (gl_area, "render", G_CALLBACK (render), NULL); + g_object_unref (pixel_format); + + 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; +} |