Use fnv hashing in rasterizer
Created by: alexheretic
Now we have reference test and benchmarks for rasterization its only natural to start optimising. Actually I'm resisting the urge to dive too deep, but when I saw the local hash map with small keys I thought to myself: I wonder if fnv hashing would be worth it here?
It seems that it is. A 9-65% draw speedup that also helps the gpu_cache population test (which is heavily rasterizing, unlike the other gpu_cache benchmarks).
name control ns/iter change ns/iter diff ns/iter diff % speedup
draw_big_biohazard 903,260 831,307 -71,953 -7.97% x 1.09
draw_iota 37,110 25,476 -11,634 -31.35% x 1.46
draw_w 10,053 6,093 -3,960 -39.39% x 1.65
gpu_cache::cache_bench_tests::bench_multi_font_population 12,274,577 9,844,106 -2,430,471 -19.80% x 1.25
I also added a open-sans 60px iota ΐ
reference test & benchmark to give us a "medium" sized glyph reference.
I actually expect we can rasterize without any hashing, I wonder how fast we can get drawing?
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