[Ves] VES-kiwi for Win8

[David Thompson]

Hi Jamie,

> Aplogies for my ignorance but does this mean that the new VTK rendering code, which iirc targets open gl 2.1+, can be run on desktop or mobile applications?

After a fashion. VTK's new rendering layer will target OpenGL 2.1 as the minimum required, but should also work with OpenGL4.1, which exposes an extension named ARB_ES2_compatibility. By enabling that extension and avoiding OpenGL calls that are not part of OpenGL/ES2, VTK applications should be able to target both desktop and mobile platforms.

I expect that some rendering techniques will use OpenGL calls not part of GL/ES2 but the plan is for the core VTK rendering classes to stick with a pretty minimal subset of calls. Also, some mobile devices may  come with full OpenGL (not GL/ES) support, in which case more rendering techniques could be supported (assuming the drivers aren't buggy... nervous laughter).

	David