A B757-200 IN CLIMB PASSING FL320 DECLARED AN EMER AND DIVERTED DUE TO SMELL OF BURNING WIRE AND SMOKE FROM CAPT'S WINDSHIELD WHICH SHATTERED.

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WE DEPARTED ON FLT ZZZ-ZZZ1. SLIGHTLY WEST OF ZZZ2. PASSING FL320 FOR 350 THE CAPT NOTICED A HOT ELECTRICAL SMELL. WITHIN A FEW SECONDS; THE SMELL BECAME MUCH STRONGER AND A GREAT DEAL OF SMOKE BEGAN COMING FROM THE BASE OF THE CAPT'S WINDSHIELD. SEVERAL OF THE FA CALL BUTTONS STARTED TO CHIME ALSO. THE CAPT GAVE ME THE ACFT AND I STOPPED THE CLIMB AND DECLARED AN EMER WITH ATC AND GOT A CLRNC FOR A DESCENT AND RETURN TO ZZZ. THE CAPT NOTICED THE WIRING LEADING TO HIS FORWARD WINDSHIELD BURNING AND TURNED OFF THE WINDOW HEAT. AS WE WERE TURNING BACK TO ZZZ; THE CAPT'S WINDSHIELD SHATTERED. THE SMELL IN THE COCKPIT WAS VERY STRONG; BUT THE SMOKE WAS BEGINNING TO DISSIPATE. AN S-80 CHECK AIRMAN HAD JOINED US IN THE COCKPIT BY THIS TIME. WE REFERRED TO THE QRH FOR A SHATTERED WINDOW AND THE SMOKE/FUMES REMOVAL CHECKLIST. THE FA'S HAD RPTED A STRONG ELECTRICAL SMELL; BUT NO SMOKE. ATC; GAVE US A DIRECT CLRNC BACK TO ZZZ AND THEN VECTORS TO THE ILS FINAL AND UNEVENTFUL LANDING ON 13R BY THE CAPT. THE CRASH CREW INSPECTED THE ACFT AND NOTED NO DAMAGE OTHER THAN THE SHATTERED WINDSHIELD. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAPT FIRST NOTED THE BURNING SMELL AND THEN NOTED A LARGE AMOUNT OF SMOKE FROM THE LOWER EDGE OF THE WINDSHIELD. THE RPTR SAID THE CABIN ATTENDANTS ALSO DETECTED THE SMELL AND STARTED CALLING THE COCKPIT TO RPT THE SMELL. THE RPTR STATED THEN THE WIRING TO THE WINDSHIELD STARTED BURNING AND WINDSHIELD HEAT WAS TURNED OFF. THE RPTR SAID ON TURNING TO THE DIVERSION STATION THE MOST INNER PANE OF THE WINDOW SHATTERED; SPREADING SMALL CHIPS OF GLASS ON THE GLARE SHIELD. THE RPTR STATED DURING THE QUICK REFERENCE CHECK IT WAS NOTED. NO CIRCUIT BREAKERS WERE FOUND TRIPPED. THIS FACT WAS VERIFIED BY MAINT ON GROUND INSPECTION. THE RPTR SAID THE CABIN ATTENDANTS DID NOT SEE SMOKE; BUT DID SMELL THE ELECTRICAL ODOR.