[Intel-gfx] My GM45 Graphics

[Emam Hossain]

20/05/2012

Dear Intel Linux Graphics Developers,

Good Afternoon, First of all I highly appreciate the quality of Mesa 8.0.3
Intel Driver for my GM45 Graphics accelerator. It has come a long way since
Mesa 7.7.1 in regards to GLSL and FBO.

Now it can run many games with decent quality at least at 640x480
resolution. I myself constantly monitor the performance and quality of the
driver by comparing with Windows's driver and testing against Linux native
games. (I have a whole lot collection of native Linux games commercial n
free)

But there are still some issues present which lagging the driver behind to
proprietary driver counterparts.


Mesa 7.11 series were almost perfect in regards to graphics glitch at least
for GM45 except some GLSL point sprite bug.


https://bugs.freedesktop.org/show_bug.cgi?id=30232 (only for GM45 even
fixed for GMA 945 with Mesa 8)



Mesa 8.0.3 series are also almost perfect except the following bugs
(regressed from 7.11)


My guess it is related to OpenGL VBO since it happened before with older
Mesa like 7.10 series but was fixed by 7.11 n again introduced by Mesa 8

https://bugs.freedesktop.org/show_bug.cgi?id=47170


(Regressed from 7.11) My guess is that since Mesa 8 introduced many new
features, the game trying to use higher shaders n eventually failing to run

https://bugs.freedesktop.org/show_bug.cgi?id=47169



Apart from that the Driver still fall behind when it comes to GLSL and
shadow rendering performance when compared to Windows’ driver.


For example, the old game Doom 3 from iD Software runs very well with
shadow enabled in Windows’ driver even on older GMA 945 but in Linux even
with GMA 4500 it lags when shadow is turned on.


Finally, my GM45 exposing 8 lights as maximum in Mesa 8 but 16 in Windows'
driver.


Best Regards,

Md Imam Hossain
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