Hi Maxim, On 13 October 2017 at 15:36, Maxim Stere <[email protected]> wrote:
> Ah, interesting...I did not know that GL3 Profile in OSG was only for MAC > compatibility. That is good to know. > It's not purely for MacOS compatibility, building the OSG with cmake . -DOPENGL=GLCORE can be used on all platforms, and is used where you don't want any of the fixed function capabilities of old GL > > Default Windows GL headers are of the old 1.1 version. So the advanced > later versions might be handled by the graphics card. > The OSG queries all extensions at runtime and provides fallbacks from elements missing from header so even if you compile against a GL 1.1 header it'll be able to use later features. > So in GL2 profile, will OSG be able to use GLSL 4.5 Core version? > If you explicitly want to exclude compatibility profile then you'll want to build the OSG with GLCORE, but otherwise the OSG will treat GL as both forward and backwards compatibility - as long as the driver supports it. In the case of GL3 under OSX they drop all compatibility profile functionality so you have no choice. Robert.
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