Fast mobile shaders or rather Mobile! Fast!

Optimizing shaders•Character shader, 10 cycles/pixel• Normal mapped••Specular, wrap around diffusePer-vertex from light probes•But how?• Lighting into LUT texture•LUT size tradeoff performance/qualityCharacter shader takes 10 cycles/pixel on Tegra2. Per pixel normal mapping, specular, wraparound diffuse; per vertex lighting from light probes.This is achieved by putting all lighting calculations into a lookup texture. Nice bonus:changing LUT size can trade performance for quality (e.g. use larger LUT on main character toget better specular; smaller LUT on enemies for better performance).