On 03/01/2011 12:32 PM, Ian Romanick wrote:
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On 03/01/2011 05:36 AM, Keith Whitwell wrote:
Create an automated bug-finder for gallium drivers.
Step one: create a "split and compare" gallium driver (perhaps based on
failover) which runs the same set of commands on two different gallium
drivers (eg softpipe and r600g). At each frame, compare the two images
and see if there are differences.
For non-trivial rendering, that had better be an awful fuzzy "compare."
All of the 3D rendering specs allow a large amount of variation in
rasterization rules and precision rules. Have you ever looked at
OpenGL's line drawing rules? Line locations can vary by +/- a pixel in
any direction.
That's not to say this isn't interesting, but it's probably only
interesting for comparing the results of different drivers for the same
hardware (e.g., r600g with and without some change).
A few years ago I did some image comparisons between different drivers
and the results were actually suprisingly close. There'd have to a
fuzz factor, but image comparisons are do-able.
-Brian
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