adding initial ridge overlay code, swiching from cubes to teapots, and a few other...

[grits] / src / ridge.c

diff --git a/src/ridge.c b/src/ridge.c
new file mode 100644 (file)
index 0000000..fc1756e
--- /dev/null
+++ b/src/ridge.c
@@ -0,0 +1,65 @@
+#include <config.h>
+#include <gtk/gtk.h>
+#include <gtk/gtkgl.h>
+#include <gdk/gdkkeysyms.h>
+#include <GL/gl.h>
+#include <math.h>
+
+static guint topo_tex;
+
+guint load_texture(char *filename)
+{
+       /* Load image */
+       GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(filename, NULL);
+       guchar    *pixels = gdk_pixbuf_get_pixels(pixbuf);
+       int        width  = gdk_pixbuf_get_width(pixbuf);
+       int        height = gdk_pixbuf_get_height(pixbuf);
+
+       /* Create Texture */
+       guint id;
+       glGenTextures(1, &id);
+       glBindTexture(GL_TEXTURE_2D, id);   // 2d texture (x and y size)
+
+       glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+       glTexImage2D(GL_TEXTURE_2D, 0, 3, width, height, 0,
+                       GL_RGB, GL_UNSIGNED_BYTE, pixels);
+       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+
+       g_message("loaded %s: w=%d h=%d", filename, width, height);
+       return id;
+}
+
+static gboolean expose(GtkWidget *da, GdkEventExpose *event, gpointer user_data)
+{
+       //g_message("ridge:expose");
+       glPushMatrix();
+       glScaled(500*1000, 500*1000, 0);
+
+       glBindTexture(GL_TEXTURE_2D, topo_tex);
+       glEnable(GL_TEXTURE_2D);
+
+       glBegin(GL_POLYGON);
+       glTexCoord2f(0.0, 0.0); glVertex3f(-1.0,  1.0, 0.1);
+       glTexCoord2f(0.0, 1.0); glVertex3f(-1.0, -1.0, 0.1);
+       glTexCoord2f(1.0, 1.0); glVertex3f( 1.0, -1.0, 0.1);
+       glTexCoord2f(1.0, 0.0); glVertex3f( 1.0,  1.0, 0.1);
+       glEnd();
+
+       glPopMatrix();
+       return FALSE;
+}
+
+static gboolean configure(GtkWidget *da, GdkEventConfigure *event, gpointer user_data)
+{
+       topo_tex = load_texture("../data/topo.jpg");
+       return FALSE;
+}
+
+gboolean ridge_init(GtkDrawingArea *drawing, GtkNotebook *config)
+{
+       /* Set up OpenGL Stuff */
+       g_signal_connect(drawing, "expose-event",    G_CALLBACK(expose),    NULL);
+       g_signal_connect(drawing, "configure-event", G_CALLBACK(configure), NULL);
+       return TRUE;
+}