Re: [AD] Memory Bitmap to Display blit slow?

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To: "Coordination of admins/developers of the game programming library Allegro" <alleg-developers@xxxxxxxxxx>
Subject: Re: [AD] Memory Bitmap to Display blit slow?
From: "Stefanos A." <stapostol@xxxxxxxxxx>
Date: Mon, 02 Mar 2009 02:16:41 +0200

Την Mon, 02 Mar 2009 01:17:25 +0200,ο(η) Evert Glebbeek <eglebbk@xxxxxxxxxx>έγραψε:

On 1 mrt 2009, at 14:44, Stefanos A. wrote:

Some recent posts on GameDev (or was it Beyond3D?) indicated an
unoptimized upload speed of ~400MB/sec from system memory to OpenGL.
The
poster was able to improve speed significantly by breaking up the
updates
in smaller calls to glTexSubImage2D, presumably because a single big
call
would thrash the cache.


Weird. I would always have expected a single block copy to be faster
than multipl smaller block copies...


Aha, I found the relevant threads:

"GL_RGB video is slow using glTexImage2D":http://www.gamedev.net/community/forums/topic.asp?topic_id=525837

"Texture upload speed issue (OpenGL)":http://forum.beyond3d.com/showthread.php?t=52178

References:
- Re: [AD] Memory Bitmap to Display blit slow?
  - From: Milan Mimica
- Re: [AD] Memory Bitmap to Display blit slow?
  - From: Thomas Fjellstrom
- Re: [AD] Memory Bitmap to Display blit slow?
  - From: Milan Mimica
- Re: [AD] Memory Bitmap to Display blit slow?
  - From: Stefanos A.
- Re: [AD] Memory Bitmap to Display blit slow?
  - From: Evert Glebbeek

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