Is there any connection between Hardware transform and lighting functionality present on NVidia GPUs (like GeForce Mx seris) and OpenGL?
If there is can someone write a small piece of code to show me how to do this?
Is there any connection between Hardware transform and lighting functionality present on NVidia GPUs (like GeForce Mx seris) and OpenGL?
If there is can someone write a small piece of code to show me how to do this?
With OpenGL it is automatic, particularly if you use the opengl transformations or glScale/glTranslate/etc. The driver takes care of that. (But I am not sure of the hhardware T&L of mx series...)
In the sense that if you're rendering on GPU, GL will automatically use HW T&L.Originally posted by ZbuffeR:
The driver takes care of that.
This does not apply if something bad happens and everything rolls back to a software path for some reason.
1. "In the sense that if you're rendering on GPU" - how can I render on GPU? Simply call glTranslate(..) and the required vertex transformation will be calculated by GPU?
How can I be sure that T&L on Nvidia card is REALLY used on OGL?
2. "This does not apply if something bad happens"
Like what?
1) glTranslate/etc transformations relies on OpenGL implementation. So it is done by the driver. If the driver knows that the card has T&L capabilities, the T&L work is sent directly to the card. Else, it is computed by the driver in software.
So you can not be SURE. But I would trust nvidia dirvers in this case. If you really want to be sure, maybe try to implement the transformations yourself to compare ? Not sure it is worth the pain though.
2) Old cards (do not remember which ones) only accelerated 1 GL light, so you can test that with a quite higly tesselated sphere, then add GL lights one by one, and see if the frame rate suddendly drops (software fallback). But on my GF3ti200, all 8 lights seem accelerated.
All is much clear now. Thanks.
I have only one more question: do you know any site where it says that T&L engine on NVidia cards is used with OpenGL?(maybe T&L is used only with DirectX).
Will you read what I said ?
I you don't trust me, read this :
http://www.delphi3d.net/faq.php?question=8
You can read this thread too, it is not too wrong :
http://www.gamedev.net/community/for...topic_id=58141
From the horse's mouth :
http://www.nvidia.com/page/search.ht...m+and+lighting
To sum up, all nvidia cards having 'GeForce' in the name, so since 2000 or so.
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