Pileus Git - aweather/blob - src/ridge.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 guint topo_tex;
   9
  10 guint load_texture(char *filename)
  11 {
  12         /* Load image */
  13         GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(filename, NULL);
  14         guchar    *pixels = gdk_pixbuf_get_pixels(pixbuf);
  15         int        width  = gdk_pixbuf_get_width(pixbuf);
  16         int        height = gdk_pixbuf_get_height(pixbuf);
  17
  18         /* Create Texture */
  19         guint id;
  20         glGenTextures(1, &id);
  21         glBindTexture(GL_TEXTURE_2D, id);   // 2d texture (x and y size)
  22
  23         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  24         glTexImage2D(GL_TEXTURE_2D, 0, 3, width, height, 0,
  25                         GL_RGB, GL_UNSIGNED_BYTE, pixels);
  26         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  27         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  28
  29         g_message("loaded %s: w=%d h=%d", filename, width, height);
  30         return id;
  31 }
  32
  33 static gboolean expose(GtkWidget *da, GdkEventExpose *event, gpointer user_data)
  34 {
  35         //g_message("ridge:expose");
  36         glPushMatrix();
  37         glScaled(500*1000, 500*1000, 0);
  38
  39         glBindTexture(GL_TEXTURE_2D, topo_tex);
  40         glEnable(GL_TEXTURE_2D);
  41
  42         glBegin(GL_POLYGON);
  43         glTexCoord2f(0.0, 0.0); glVertex3f(-1.0,  1.0, 0.1);
  44         glTexCoord2f(0.0, 1.0); glVertex3f(-1.0, -1.0, 0.1);
  45         glTexCoord2f(1.0, 1.0); glVertex3f( 1.0, -1.0, 0.1);
  46         glTexCoord2f(1.0, 0.0); glVertex3f( 1.0,  1.0, 0.1);
  47         glEnd();
  48
  49         glPopMatrix();
  50         return FALSE;
  51 }
  52
  53 static gboolean configure(GtkWidget *da, GdkEventConfigure *event, gpointer user_data)
  54 {
  55         topo_tex = load_texture("../data/topo.jpg");
  56         return FALSE;
  57 }
  58
  59 gboolean ridge_init(GtkDrawingArea *drawing, GtkNotebook *config)
  60 {
  61         /* Set up OpenGL Stuff */
  62         g_signal_connect(drawing, "expose-event",    G_CALLBACK(expose),    NULL);
  63         g_signal_connect(drawing, "configure-event", G_CALLBACK(configure), NULL);
  64         return TRUE;
  65 }