Re: 640x512x16bpp with VESA ?

On Fri, 16 May 2008 02:23:59 +0200, whygee <spamtrap@xxxxxxxxxx>
wrote:
<snip>
Also, i could have chosen to simply use 1280x1024 and display
a pixel with 4 real pixels, but i can't in practice.
My algo performs huge quantities of random accesses to the framebuffer
and this already saturates the write combining buffers.
I could maybe double a pixel in a line, but not on consecutive lines
(or the software would slow down the already inefficient CPU).
So at least i need the doublescan feature.

How about doing those random accesses to an intermediate buffer set to
the 640x512 size, then doing the doubling when you transfer it to the
display? Or maybe use a 1280x512 buffer and then just do the
double-scan during transfers.

Best regards,



Bob Masta

DAQARTA v3.50
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, FREE Signal Generator
Science with your sound card!

.

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