https://github.com/netpyoung/libfixmath.net
These functions operate on 32-bit numbers, fix16_t, which have 16 bit integer part and 16 bit fractional part.
https://github.com/netpyoung/libfixmath.net
fix16 float libfixmath
Last synced: about 1 year ago
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These functions operate on 32-bit numbers, fix16_t, which have 16 bit integer part and 16 bit fractional part.
- Host: GitHub
- URL: https://github.com/netpyoung/libfixmath.net
- Owner: netpyoung
- License: mit
- Created: 2018-05-28T19:50:05.000Z (about 8 years ago)
- Default Branch: master
- Last Pushed: 2018-05-30T14:07:58.000Z (about 8 years ago)
- Last Synced: 2025-04-07T20:16:31.263Z (over 1 year ago)
- Topics: fix16, float, libfixmath
- Language: C#
- Homepage:
- Size: 240 KB
- Stars: 0
- Watchers: 1
- Forks: 1
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE.md
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README
libfixmath.net
=========================
* origin : https://code.google.com/archive/p/libfixmath/
## fix16
```cs
using fix16_t = System.Int32;
public struct fix16
{
private fix16_t value;
}
```
* 32-bit numbers, fix16_t, which have 16 bit integer part and 16 bit fractional part.
* max : 32767.999_985
* min : -32768.0
- The minimum value is also used to represent fix16_overflow for overflow detection, so for some operations it cannot be determined whether it overflowed or the result was the smallest possible value. In practice this does not matter much.
* The smallest unit (machine precision) of the datatype is 1/65536 = 0.000_015
# wiki
* https://code.google.com/archive/p/libfixmath/wikis/FunctionReference.wiki
# Define Option
* I already removed `FIXMATH_NO_64BIT`, `FIXMATH_OPTIMIZE_8BIT` from origin source.
```
Accuracy
FIXMATH_NO_ROUNDING: Disable rounding. Results may round randomly up or down, i.e. their accuracy is +-1. Runs slightly faster.
FIXMATH_NO_OVERFLOW: Disable overflow detection and saturating arithmetic support. Overflowing computations will give garbage results. Runs slightly faster.
Platform
FIXMATH_NO_CACHE: Do not use cache for exp etc. function results. Uses less RAM, runs slightly slower.
Algorithms
FIXMATH_SIN_LUT: This uses a look-up table generated by the fixsingen tool from svn, it is faster on some devices but the lookup table takes up ~200KiB (205376 bytes) in memory and can be slower dependant on usage.
FIXMATH_FAST_SIN: This enables a faster but less accurate approximation of the sin function, for code where accuracy isn't as important such as games logic or graphics rendering then this is often a worthwhile tradeoff.
```
# why.
When I try to test deterministic logic on game, I tried to find float library. and I found some. but I decided to customize from original libfixmath.
* https://github.com/asik/FixedMath.Net
* https://github.com/sungiant/abacus
* I don't need 64bit float.
* float library slower than float. so as possible as I choose more faster logic.