Pileus Git - aweather/blob - src/cube.c

   1 #include <config.h>
   2 #include <gtk/gtk.h>
   3 #include <gtk/gtkgl.h>
   4 #include <gdk/gdkkeysyms.h>
   5 #include <GL/gl.h>
   6 #include <math.h>
   7
   8 static GtkWidget *rotate_button;
   9
  10 float boxv[][3] = {
  11         { -0.5, -0.5, -0.5 },
  12         {  0.5, -0.5, -0.5 },
  13         {  0.5,  0.5, -0.5 },
  14         { -0.5,  0.5, -0.5 },
  15         { -0.5, -0.5,  0.5 },
  16         {  0.5, -0.5,  0.5 },
  17         {  0.5,  0.5,  0.5 },
  18         { -0.5,  0.5,  0.5 }
  19 };
  20 #define ALPHA 0.5
  21
  22 static float ang = 30.;
  23
  24 gboolean expose (GtkWidget *da, GdkEventExpose *event, gpointer user_data)
  25 {
  26         GdkGLContext *glcontext = gtk_widget_get_gl_context (da);
  27         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable (da);
  28
  29         // g_print (" :: expose\n");
  30
  31         if (!gdk_gl_drawable_gl_begin (gldrawable, glcontext))
  32         {
  33                 g_assert_not_reached ();
  34         }
  35
  36         /* draw in here */
  37         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  38         glPushMatrix();
  39
  40         glRotatef (ang, 1, 0, 1);
  41
  42         glShadeModel(GL_FLAT);
  43
  44         glBegin (GL_LINES);
  45         glColor3f (1., 0., 0.);
  46         glVertex3f (0., 0., 0.);
  47         glVertex3f (1., 0., 0.);
  48         glEnd ();
  49
  50         glBegin (GL_LINES);
  51         glColor3f (0., 1., 0.);
  52         glVertex3f (0., 0., 0.);
  53         glVertex3f (0., 1., 0.);
  54         glEnd ();
  55
  56         glBegin (GL_LINES);
  57         glColor3f (0., 0., 1.);
  58         glVertex3f (0., 0., 0.);
  59         glVertex3f (0., 0., 1.);
  60         glEnd ();
  61
  62         glBegin(GL_LINES);
  63         glColor3f (1., 1., 1.);
  64         glVertex3fv(boxv[0]);
  65         glVertex3fv(boxv[1]);
  66
  67         glVertex3fv(boxv[1]);
  68         glVertex3fv(boxv[2]);
  69
  70         glVertex3fv(boxv[2]);
  71         glVertex3fv(boxv[3]);
  72
  73         glVertex3fv(boxv[3]);
  74         glVertex3fv(boxv[0]);
  75
  76         glVertex3fv(boxv[4]);
  77         glVertex3fv(boxv[5]);
  78
  79         glVertex3fv(boxv[5]);
  80         glVertex3fv(boxv[6]);
  81
  82         glVertex3fv(boxv[6]);
  83         glVertex3fv(boxv[7]);
  84
  85         glVertex3fv(boxv[7]);
  86         glVertex3fv(boxv[4]);
  87
  88         glVertex3fv(boxv[0]);
  89         glVertex3fv(boxv[4]);
  90
  91         glVertex3fv(boxv[1]);
  92         glVertex3fv(boxv[5]);
  93
  94         glVertex3fv(boxv[2]);
  95         glVertex3fv(boxv[6]);
  96
  97         glVertex3fv(boxv[3]);
  98         glVertex3fv(boxv[7]);
  99         glEnd();
 100
 101         glPopMatrix ();
 102
 103         if (gdk_gl_drawable_is_double_buffered (gldrawable))
 104                 gdk_gl_drawable_swap_buffers (gldrawable);
 105
 106         else
 107                 glFlush ();
 108
 109         gdk_gl_drawable_gl_end (gldrawable);
 110
 111         return TRUE;
 112 }
 113
 114 gboolean configure(GtkWidget *da, GdkEventConfigure *event, gpointer user_data)
 115 {
 116         GdkGLContext *glcontext = gtk_widget_get_gl_context (da);
 117         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable (da);
 118
 119         if (!gdk_gl_drawable_gl_begin (gldrawable, glcontext))
 120         {
 121                 g_assert_not_reached ();
 122         }
 123
 124         glLoadIdentity();
 125         glViewport (0, 0, da->allocation.width, da->allocation.height);
 126         glOrtho (-10,10,-10,10,-20050,10000);
 127         glEnable (GL_BLEND);
 128         glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 129
 130         glScalef (10., 10., 10.);
 131
 132         gdk_gl_drawable_gl_end (gldrawable);
 133
 134         return TRUE;
 135 }
 136
 137 gboolean rotate (gpointer user_data)
 138 {
 139         if (!gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(rotate_button)))
 140                 return TRUE;
 141
 142         GtkWidget *da = GTK_WIDGET (user_data);
 143
 144         ang++;
 145
 146         gdk_window_invalidate_rect (da->window, &da->allocation, FALSE);
 147         gdk_window_process_updates (da->window, FALSE);
 148
 149         return TRUE;
 150 }
 151
 152 gboolean cube_init(GtkDrawingArea *drawing, GtkNotebook *config)
 153 {
 154         /* Add configuration tab */
 155         GtkWidget *label = gtk_label_new("Cube");
 156         rotate_button = gtk_toggle_button_new_with_label("Rotate");
 157         gtk_notebook_append_page(GTK_NOTEBOOK(config), rotate_button, label);
 158
 159         /* Set up OpenGL Stuff */
 160         g_signal_connect(drawing, "configure-event", G_CALLBACK(configure), NULL);
 161         g_signal_connect(drawing, "expose-event",    G_CALLBACK(expose),    NULL);
 162         g_timeout_add(1000/60, rotate, drawing);
 163 }