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Re: [Qemu-devel] [PATCH] OpenGL for OS X

From: Gwenole Beauchesne
Subject: Re: [Qemu-devel] [PATCH] OpenGL for OS X
Date: Wed, 6 Feb 2008 07:00:21 +0100


2008/2/5, Fabrice Bellard <address@hidden>:

> This is an SDL related issue (i.e. SDL may or may not use OpenGL to
> display graphics). Fixing SDL for Mac OS X would also be interesting.

I think SDL trunk (1.3) supports OpenGL rendering more specifically
for various platforms.

Besides, on my MacBook, fullscreen SDL with a HW surface can indeed
perform much better (550 Mpixels/sec) than fullscreen GL (190
Mpixels/sec). With a SW surface, results are equivalent to GL though.

In windowed (800x600) mode, SDL performs at 28 Mpixels/sec and GL at
150 Mpixels/sec. So, SDL 1.2 for OSX (CG?) in windowed mode is indeed
sub-optimal. I have not tried with SDL trunk yet.

You can get my tests as svn co

Note: I am not sure if I am using GL/PBOs correctly though I followed
the specs. I mean the tests run e.g. on Linux but not on Windows with
the same level of drivers (nvidia 169.xx). In the latter case, the
program crashes in glUnmapBuffer()...


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