Hello everyone,
i've encountered an odd bug on my Intel HD4000.
Using textureProjOffset in a GLSL shader to sample the shadow texture on different locations leads to some very bad results both in performance AND image quality: rendering drops from 20ms/frame to 50-60 ms/frame and most of the time, shadows are projected just wrong or not projected at all.
I notice that this problem is not present on my other setup with HD4600, nor on my discrete card (nvidia GT750M SLI).
Drivers are updated, reference hardware is a last generation Mac Mini with Windows 7 x64.