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* NEON f32 <-> f16 and f32 <-> u16Gravatar mtklein2016-02-19
| | | | | | | | | | | | | | | | | | Adds f32 <-> f16 ARMv7 and ARMv8 NEON code. Also adds NEON f32 <-> u16 code to make the comparison fair. The NDK GCC does not support the ARMv8 NEON intrinsics needed to go fastest, so we use a tiny amount of inline assembly. The ARMv7 half -> float is different enough from the SSE version that it does not make sense to use SkNx. Still TODO: ARMv7 float -> half. Naively translating the SSE version results in 0x0000 where we'd expect a denormal output. BUG=skia: GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1700473003 CQ_EXTRA_TRYBOTS=client.skia.android:Test-Android-GCC-Nexus5-CPU-NEON-Arm7-Release-Trybot,Test-Android-GCC-Nexus9-CPU-Denver-Arm64-Release-Trybot;client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot Review URL: https://codereview.chromium.org/1700473003
* new version of SkHalfToFloat_01Gravatar mtklein2016-02-11
| | | | | | | | | This is a little faster than the previous version, and much better explained. BUG=skia: GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1688233002 Review URL: https://codereview.chromium.org/1688233002
* SkHalfToFloat_01 / SkFloatToHalf_01Gravatar mtklein2016-02-11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | These are basically inlined, 4-at-a-time versions of our existing functions, but cut down to avoid any work that's only necessary outside [0,1]. Both f16 and f32 denorms should work fine modulo the usual ARMv7 NEON denorm==zero caveat. In exchange for a little speed, f32->f16 does not round properly. Instead it truncates, so it's never off by more than 1 bit. Support for finite values >1 or <0 is straightforward to add back. >1 might already work as-is. Getting close to _u16 performance: micros bench 261.13 xferu64_bw_1_opaque_u16 1833.51 xferu64_bw_1_alpha_u16 2762.32 ? xferu64_aa_1_opaque_u16 3334.29 xferu64_aa_1_alpha_u16 249.78 xferu64_bw_1_opaque_f16 3383.18 xferu64_bw_1_alpha_f16 4214.72 xferu64_aa_1_opaque_f16 4701.19 xferu64_aa_1_alpha_f16 BUG=skia: GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1685133005 Committed: https://skia.googlesource.com/skia/+/9ea11a4235b3e3521cc8bf914a27c2d0dc062db9 CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot Review URL: https://codereview.chromium.org/1685133005
* Revert of SkHalfToFloat_01 / SkFloatToHalf_01 (patchset #11 id:200001 of ↵Gravatar mtklein2016-02-11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | https://codereview.chromium.org/1685133005/ ) Reason for revert: Gotta fix Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD Original issue's description: > SkHalfToFloat_01 / SkFloatToHalf_01 > > These are basically inlined, 4-at-a-time versions of our existing functions, > but cut down to avoid any work that's only necessary outside [0,1]. > > Both f16 and f32 denorms should work fine modulo the usual ARMv7 NEON denorm==zero caveat. > > In exchange for a little speed, f32->f16 does not round properly. > Instead it truncates, so it's never off by more than 1 bit. > > Support for finite values >1 or <0 is straightforward to add back. > >1 might already work as-is. > > Getting close to _u16 performance: > micros bench > 261.13 xferu64_bw_1_opaque_u16 > 1833.51 xferu64_bw_1_alpha_u16 > 2762.32 ? xferu64_aa_1_opaque_u16 > 3334.29 xferu64_aa_1_alpha_u16 > 249.78 xferu64_bw_1_opaque_f16 > 3383.18 xferu64_bw_1_alpha_f16 > 4214.72 xferu64_aa_1_opaque_f16 > 4701.19 xferu64_aa_1_alpha_f16 > > > BUG=skia: > GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1685133005 > > Committed: https://skia.googlesource.com/skia/+/9ea11a4235b3e3521cc8bf914a27c2d0dc062db9 TBR=jvanverth@google.com,reed@google.com,mtklein@chromium.org # Skipping CQ checks because original CL landed less than 1 days ago. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=skia: Review URL: https://codereview.chromium.org/1693443003
* SkHalfToFloat_01 / SkFloatToHalf_01Gravatar mtklein2016-02-11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | These are basically inlined, 4-at-a-time versions of our existing functions, but cut down to avoid any work that's only necessary outside [0,1]. Both f16 and f32 denorms should work fine modulo the usual ARMv7 NEON denorm==zero caveat. In exchange for a little speed, f32->f16 does not round properly. Instead it truncates, so it's never off by more than 1 bit. Support for finite values >1 or <0 is straightforward to add back. >1 might already work as-is. Getting close to _u16 performance: micros bench 261.13 xferu64_bw_1_opaque_u16 1833.51 xferu64_bw_1_alpha_u16 2762.32 ? xferu64_aa_1_opaque_u16 3334.29 xferu64_aa_1_alpha_u16 249.78 xferu64_bw_1_opaque_f16 3383.18 xferu64_bw_1_alpha_f16 4214.72 xferu64_aa_1_opaque_f16 4701.19 xferu64_aa_1_alpha_f16 BUG=skia: GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1685133005 Review URL: https://codereview.chromium.org/1685133005
* Add support for half float alpha textures.Gravatar jvanverth2014-12-05
| | | | | | | | | This allows us to create distance field textures with better precision, which may help text quality. BUG=skia:3103 Review URL: https://codereview.chromium.org/762923003
* Add float-to-half (binary16) conversion functions.Gravatar jvanverth2014-11-26
Based on code by Fabian Giesen at https://fgiesen.wordpress.com/2012/03/28/half-to-float-done-quic/. These will be needed for creating binary16 textures from floating point data. BUG=skia:3103 Review URL: https://codereview.chromium.org/760753003
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