Adam Jackson <a...@nwnk.net> writes: > Is there some reason you believe GL's rasterisation rules for lines > match fb's zero-width lines? Section 14.5.1 of the 4.5 spec looks quite > a bit looser than fb to me.
I think they're 'good enough'; there aren't any rules requiring particular rasterization for either, the only thing X requests is that 'not last' cap mode not draw the last pixel. afaict, GL suggests 'not last' as the only option. It sounds like some drivers are doing both 'not last' and 'not first' though? The more serious problem is that dashing isn't working, and that's just bugs (either driver or glamor) as dashing is done in the fragment shader. I guess we could just run some tests at server startup to see what kind of rasterization the driver was performing and compensate? Do a survey of current results and try to come up with some bright-line tests to distinguish between them, maybe bailing to MI if we get inconsistent results? -- -keith
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