Created attachment 788192 [details] a screenshot of potree, demonstrating the problem Description of problem: While viewing a WebGL Model which is drawn as a point-cloud, the splats are not round, even if the fragment shader tries to discard all pixels outside the incircle. Version-Release number of selected component (if applicable): todays Firefox Aurora build (and earlier) on Firefox 19 Steps to Reproduce: 1. open a point-cloud WebGL application which tries to draw round splats, like http://potree.org/demo/lion/lion_takanawa.html 2. zoom in and set the point-size to a lower value, like 0.2 3. choose "Weighted Points" in the drop down list Actual results: the splats look like a quarter of a circle or a triangle Expected results: the splats should be round Additional info: This bug is not limited to Firefox. Chrome shows the same behaviour. And it is _not_ reproducible on Debian or Windows. That's the reason why I fill the bug here, and not in bugzilla.mozilla. I've chosen firefox as component, because I don't know which part of Fedora is responsible for WebGL / OpenGL related operations. Maybe someone can concretize this. Notice the difference between "Weighted Points" and "Filtered Points" in the potree demo. I have a similar application which suffers from this bug. The fragment shader looks like this: float dist = distance(gl_PointCoord, vec2(0.5, 0.5)); if(dist >= 0.5) { discard; } I attached screenshots of the potree demo, showing the issue, in case you can't reproduce it.
Created attachment 788193 [details] correct draw as a comparison
I see. I guess it's related to OpenGL implementation and/or graphics drivers. Which HW/drivers do you run?
Thanks for looking into.. $ glxinfo | grep 'OpenGL renderer' OpenGL renderer string: Mesa DRI Intel(R) Ironlake Mobile Maybe this is also useful: 00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02) (prog-if 00 [VGA controller]) Subsystem: Hewlett-Packard Company Device 144a Flags: bus master, fast devsel, latency 0, IRQ 43 Memory at c0000000 (64-bit, non-prefetchable) [size=4M] Memory at b0000000 (64-bit, prefetchable) [size=256M] I/O ports at 5050 [size=8] Expansion ROM at <unassigned> [disabled] Capabilities: <access denied> Kernel driver in use: i915 Let me know if you need additional info.
Works as expected for me so it looks like a driver problem. Moving to X.
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