Ocean lighting algorithm:
"Real-time Realistic Ocean Lighting using 
Seamless Transitions from Geometry to BRDF"
Eric Bruneton, Fabrice Neyret, Nicolas Holzschuch
Eurographics 2010

Ocean surface synthesized by FFT:
"Simulating Ocean Water", J. Tessendorf,
SIGGRAPH course notes, 2005.

User Interface
- mouse drag = move the Sun
- page up / page down : increase / decrease distance to ground
- left / right arrows : increase / decrease camera azimuth angle
- + / - : increase / decrease camera tilt angle
- ESC : exit

NOTE: after changing the wind speed and/or the inverse wave age
parameter, do not forget to click on "Generate" to get a correct
lighting.