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 float boxv[][3] = {
   9         { -0.5, -0.5, -0.5 },
  10         {  0.5, -0.5, -0.5 },
  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 };
  18 #define ALPHA 0.5
  19
  20 static float ang = 30.;
  21
  22 gboolean expose (GtkWidget *da, GdkEventExpose *event, gpointer user_data)
  23 {
  24         GdkGLContext *glcontext = gtk_widget_get_gl_context (da);
  25         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable (da);
  26
  27         // g_print (" :: expose\n");
  28
  29         if (!gdk_gl_drawable_gl_begin (gldrawable, glcontext))
  30         {
  31                 g_assert_not_reached ();
  32         }
  33
  34         /* draw in here */
  35         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  36         glPushMatrix();
  37
  38         glRotatef (ang, 1, 0, 1);
  39
  40         glShadeModel(GL_FLAT);
  41
  42         glBegin (GL_LINES);
  43         glColor3f (1., 0., 0.);
  44         glVertex3f (0., 0., 0.);
  45         glVertex3f (1., 0., 0.);
  46         glEnd ();
  47
  48         glBegin (GL_LINES);
  49         glColor3f (0., 1., 0.);
  50         glVertex3f (0., 0., 0.);
  51         glVertex3f (0., 1., 0.);
  52         glEnd ();
  53
  54         glBegin (GL_LINES);
  55         glColor3f (0., 0., 1.);
  56         glVertex3f (0., 0., 0.);
  57         glVertex3f (0., 0., 1.);
  58         glEnd ();
  59
  60         glBegin(GL_LINES);
  61         glColor3f (1., 1., 1.);
  62         glVertex3fv(boxv[0]);
  63         glVertex3fv(boxv[1]);
  64
  65         glVertex3fv(boxv[1]);
  66         glVertex3fv(boxv[2]);
  67
  68         glVertex3fv(boxv[2]);
  69         glVertex3fv(boxv[3]);
  70
  71         glVertex3fv(boxv[3]);
  72         glVertex3fv(boxv[0]);
  73
  74         glVertex3fv(boxv[4]);
  75         glVertex3fv(boxv[5]);
  76
  77         glVertex3fv(boxv[5]);
  78         glVertex3fv(boxv[6]);
  79
  80         glVertex3fv(boxv[6]);
  81         glVertex3fv(boxv[7]);
  82
  83         glVertex3fv(boxv[7]);
  84         glVertex3fv(boxv[4]);
  85
  86         glVertex3fv(boxv[0]);
  87         glVertex3fv(boxv[4]);
  88
  89         glVertex3fv(boxv[1]);
  90         glVertex3fv(boxv[5]);
  91
  92         glVertex3fv(boxv[2]);
  93         glVertex3fv(boxv[6]);
  94
  95         glVertex3fv(boxv[3]);
  96         glVertex3fv(boxv[7]);
  97         glEnd();
  98
  99         glPopMatrix ();
 100
 101         if (gdk_gl_drawable_is_double_buffered (gldrawable))
 102                 gdk_gl_drawable_swap_buffers (gldrawable);
 103
 104         else
 105                 glFlush ();
 106
 107         gdk_gl_drawable_gl_end (gldrawable);
 108
 109         return TRUE;
 110 }
 111
 112 gboolean configure(GtkWidget *da, GdkEventConfigure *event, gpointer user_data)
 113 {
 114         GdkGLContext *glcontext = gtk_widget_get_gl_context (da);
 115         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable (da);
 116
 117         if (!gdk_gl_drawable_gl_begin (gldrawable, glcontext))
 118         {
 119                 g_assert_not_reached ();
 120         }
 121
 122         glLoadIdentity();
 123         glViewport (0, 0, da->allocation.width, da->allocation.height);
 124         glOrtho (-10,10,-10,10,-20050,10000);
 125         glEnable (GL_BLEND);
 126         glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 127
 128         glScalef (10., 10., 10.);
 129
 130         gdk_gl_drawable_gl_end (gldrawable);
 131
 132         return TRUE;
 133 }
 134
 135 gboolean rotate (gpointer user_data)
 136 {
 137         GtkWidget *da = GTK_WIDGET (user_data);
 138
 139         ang++;
 140
 141         gdk_window_invalidate_rect (da->window, &da->allocation, FALSE);
 142         gdk_window_process_updates (da->window, FALSE);
 143
 144         return TRUE;
 145 }