The GT 640 is an OpenGL 4 card, then hardware tessellation is ok. The GeForce GT 330M is not an OpenGL capable hardware, so I presume that the tests with the GT 330M used Apple’s software renderer (GpuTest has a checkbox to enable software renderer on OSX). According to this page, he tested tessellation with NVIDIA cards (GT 640, GT 330M) so his conclusion is true but only with NVIDIA GPUs. His conclusion is that tessellation does work on Mac OS X. Jon Macey (Bournemouth University) did some investiguations on GpuTest to know how I managed to run TessMark on OS X and to see if tessellation really works on OS X. Tessellation control shader error: ERROR: 0:16: Indirect index into implicitly-sized array 2 – with Radeon HD 6750M (Macbook Pro, OSX 10.8.2), the tesselation demo does not work and there is an error in the tessellation control shader:.1 – with Radeon HD 6970M (iMac, probably on OSX 10.8), there’s no shader error but the tessellation runs in software mode (around 1FPS) according to this feedback.
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