W dniu 10-02-09 15:37, Eero Tamminen pisze:
Hi,
ext Kuba Irzabek wrote:
Is xserver in Maemo 5 (Nokia N900 OMAP 3) using hardware acceleration
(SGX)?
Yes, to some extent, but SGX is 3D accelerator, you cannot really expect
it to make much difference for most 2D operations.
Thanks for your answers. I still have some...
Are the drivers released to public? Where can I find them?
I've read that OMAP 3 SGX accelerator can be used in a 2.5D user
interface acceleration using OpenGL ES 2.0 and also to accelerate Adobe
Flash or SVG using OpenVG (Introduction to Graphics Software Development
for OMAPTM 2/3 - TI document spry110.pdf). And what about composite
window managers for X on OMAP? Is it possible for now to run them using
SGX? I'm not very familiar with graphics, so my questions are basic.
Best regards,
Kuba
For simple 2D operations like blitting, SGX is actually slower. In those
kind of operations both CPU and SGX are memory bandwidth bound, but SGX
is run at slower speed than CPU and has command setup cost.
Memory ownership change between CPU and SGX has also a performance cost
because this requires cache flush.
I cannot find confirmation on that anywhere. I found inforamtion
that accelerated user interface on omap 3 can be done using qt
embedded or clutter and not xserver. Where can I find more on that
topic?
- Eero
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