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== 2016 == | == 2016 == | ||
=== SIMD === | |||
Erik is experimenting with streamlined Canvas rendering using Single Instruction Multiple Data (SIMD) instructions which is able to calculate on 4 floating poit variables simultaneously (e.g 3 or 4 value vectors). For the F-16 map this gives a speedup from 12+ seconds delay rendering at the first select down to 1.5 seconds delay.<ref>{{cite web | Erik is experimenting with streamlined Canvas rendering using Single Instruction Multiple Data (SIMD) instructions which is able to calculate on 4 floating poit variables simultaneously (e.g 3 or 4 value vectors). For the F-16 map this gives a speedup from 12+ seconds delay rendering at the first select down to 1.5 seconds delay.<ref>{{cite web | ||
|url = https://sourceforge.net/p/flightgear/mailman/message/35555294/ | |url = https://sourceforge.net/p/flightgear/mailman/message/35555294/ | ||
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}}</ref> | }}</ref> | ||
=== Porting the HUD === | |||
James is planning to port the C++ HUD to use Canvas for its rendering soon (next few months), but he plans to keep XML compatibility (so aircraft don't see any change) and will keep the placement logic relative to the view, for the same reason. <ref>{{cite web | James is planning to port the C++ HUD to use Canvas for its rendering soon (next few months), but he plans to keep XML compatibility (so aircraft don't see any change) and will keep the placement logic relative to the view, for the same reason. <ref>{{cite web | ||
|url = https://forum.flightgear.org/viewtopic.php?p=301277#p301277 | |url = https://forum.flightgear.org/viewtopic.php?p=301277#p301277 | ||
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}}</ref> | }}</ref> | ||
=== Skia backend === | |||
James is also currently looking at making a Skia backend for the Canvas (to replace Shiva, making a solution using Skia ([https://skia.org https://skia.org]) as the backend, because this would give good performance via its OpenGL backend, make people who don’t want to use Qt happier, and could also replace the OSG rendering of the Canvas within FlightGear itself, allowing us to ditch ShivaVG (which is unmaintained) and probably improve performance substantially. (Skia can do SSE3/NEON optimised software rendering in a background thread, so Canvas wouldn’t eat into our OSG / triangle budget)<ref>{{cite web | James is also currently looking at making a Skia backend for the Canvas (to replace Shiva, making a solution using Skia ([https://skia.org https://skia.org]) as the backend, because this would give good performance via its OpenGL backend, make people who don’t want to use Qt happier, and could also replace the OSG rendering of the Canvas within FlightGear itself, allowing us to ditch ShivaVG (which is unmaintained) and probably improve performance substantially. (Skia can do SSE3/NEON optimised software rendering in a background thread, so Canvas wouldn’t eat into our OSG / triangle budget)<ref>{{cite web | ||
|url = https://forum.flightgear.org/viewtopic.php?p=300990#p300990 | |url = https://forum.flightgear.org/viewtopic.php?p=300990#p300990 | ||