Vertex Buffer

Graphics and GPU Programming Programming

Started by Zeblar Nagrim July 30, 2001 07:22 AM

4 comments, last by Zeblar Nagrim 22 years, 8 months ago

Zeblar Nagrim

150

Author

July 30, 2001 07:22 AM

How many vertex can a vertex buffer have in d3d8?

Zero Point Gameplay Dark ambient and strange techno

Boki

124

July 30, 2001 11:24 AM

Depends on the device. Check the MaxPrimitiveCount/MaxVertexIndex caps of the devices D3DCAPS8 structure.

Bjørn.

We are boki. The rest is known.

Zeblar Nagrim

150

Author

July 30, 2001 12:45 PM

But isn´t MaxPrimitiveCount how many vertex you can render with one call to DrawPrimitive?

Zeblar Nagrim, Lord of Chaos

Zero Point Gameplay Dark ambient and strange techno

Boki

124

July 30, 2001 01:50 PM

Yup, but "it''s usually not a good idea to make VBs any larger, since the driver has to find a free block of contiguous AGP memory to fit the buffer - hence it''s typically easier/faster when the VB is smaller. It''s sorta-documented in NVidia''s white-paper "The Efficient Use of Vertex Buffers" (it mentions a limit of 65535 vertices)." [1]

Bjørn.

[1] http://discuss.microsoft.com/SCRIPTS/WA-MSD.EXE?A2=ind0011E&L=DIRECTXDEV&P=R195

We are boki. The rest is known.

Zeblar Nagrim

150

Author

July 30, 2001 04:34 PM

ok. Thank you for your reply. In that case I must probably use a couple or two of those vertex buffer... Currently I have 200000 vertex in my scene at the same time. Or maybe I should use only one and refill it.

Zero Point Gameplay Dark ambient and strange techno

Boki

124

July 31, 2001 04:29 AM

Profile both variants. I don''t know if its cheaper to refill a vb with several 1000 vertices then switching vbs.

Bjørn.

We are boki. The rest is known.

Vertex Buffer

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