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

   1 #include <config.h>
   2 #include <gtk/gtk.h>
   3 #include <gtk/gtkgl.h>
   4 #include <GL/gl.h>
   5
   6 static gboolean expose_start(GtkWidget *da, GdkEventExpose *event, gpointer user_data)
   7 {
   8         GdkGLContext *glcontext = gtk_widget_get_gl_context(da);
   9         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(da);
  10
  11         if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext)) {
  12                 g_assert_not_reached();
  13         }
  14
  15         /* draw in here */
  16         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  17         return FALSE;
  18 }
  19 /* Plugins run stuff here */
  20 static gboolean expose_end(GtkWidget *da, GdkEventExpose *event, gpointer user_data)
  21 {
  22         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(da);
  23
  24         if (gdk_gl_drawable_is_double_buffered(gldrawable))
  25                 gdk_gl_drawable_swap_buffers(gldrawable);
  26         else
  27                 glFlush();
  28
  29         gdk_gl_drawable_gl_end(gldrawable);
  30
  31         return FALSE;
  32 }
  33 static gboolean configure_start(GtkWidget *da, GdkEventConfigure *event, gpointer user_data)
  34 {
  35         GdkGLContext  *glcontext  = gtk_widget_get_gl_context(da);
  36         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(da);
  37
  38         if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
  39                 g_assert_not_reached();
  40
  41         glLoadIdentity();
  42         glViewport(0, 0, da->allocation.width, da->allocation.height);
  43         glEnable(GL_BLEND);
  44         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  45         //glEnable(GL_ALPHA_TEST);
  46         //glAlphaFunc(GL_EQUAL, 0);
  47         double scale = 500*1000; // 500 km
  48         glOrtho(-scale,scale,-scale,scale,0,10000);
  49
  50         return FALSE;
  51 }
  52 static gboolean configure_end(GtkWidget *da, GdkEventConfigure *event, gpointer user_data)
  53 {
  54         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(da);
  55         gdk_gl_drawable_gl_end(gldrawable);
  56         return FALSE;
  57 }
  58
  59 gboolean opengl_init(GtkDrawingArea *drawing, GtkNotebook *config)
  60 {
  61         /* Set up OpenGL Stuff */
  62         g_signal_connect      (drawing, "configure-event", G_CALLBACK(configure_start), NULL);
  63         g_signal_connect_after(drawing, "configure-event", G_CALLBACK(configure_end),   NULL);
  64         g_signal_connect      (drawing, "expose-event",    G_CALLBACK(expose_start),    NULL);
  65         g_signal_connect_after(drawing, "expose-event",    G_CALLBACK(expose_end),      NULL);
  66         return TRUE;
  67 }