Fast mobile shaders or rather Mobile! Fast!

Burning Walls shader•Texture or ALU bound?• ALU bound•Start with high precision• Move complex | highp math into texturelookups• Move highp into vertex shader••Refactor to reduce swizzles on lowpPVRUniSCo for rough estimate• But very approximate! (no SGX543 profile)Initially shader was written by artists, and while it did what it was supposed to do, it wasquite expensive.Use lowp where possible; move math into either texture lookups or into vertex shader(approximate but was fine). Refactor some math to avoid swizzles on lowp data.