Started sketching the photon mapping.

rgbe.cpp

@@ -1,7 +1,29 @@
-#include <cmath>
+/* THIS CODE CARRIES NO GUARANTEE OF USABILITY OR FITNESS FOR ANY PURPOSE.
+ * WHILE THE AUTHORS HAVE TRIED TO ENSURE THE PROGRAM WORKS CORRECTLY,
+ * IT IS STRICTLY USE AT YOUR OWN RISK.  */
+
+/* This file contains code to read and write four byte rgbe file format
+ developed by Greg Ward.  It handles the conversions between rgbe and
+ pixels consisting of floats.  The data is assumed to be an array of floats.
+ By default there are three floats per pixel in the order red, green, blue.
+ (RGBE_DATA_??? values control this.)  Only the mimimal header reading and 
+ writing is implemented.  Each routine does error checking and will return
+ a status value as defined below.  This code is intended as a skeleton so
+ feel free to modify it to suit your needs.
+
+ (Place notice here if you modified the code.)
+ posted to http://www.graphics.cornell.edu/~bjw/
+ written by Bruce Walter  (bjw@graphics.cornell.edu)  5/26/95
+ based on code written by Greg Ward
+*/
+
+#include <glm/glm.hpp>
 
 #include "rgbe.hpp"
 
+using glm::frexp;
+using glm::ldexp;
+
 /* standard conversion from float pixels to rgbe pixels */
 /* note: you can remove the "inline"s if your compiler complains about it */
 void float2rgbe(unsigned char rgbe[4], float red, float green, float blue) {