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feat(binary): add float/int conversions
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postspectacular committed Feb 6, 2020
1 parent 77fbb77 commit 2e02d34
Showing 1 changed file with 24 additions and 0 deletions.
24 changes: 24 additions & 0 deletions packages/binary/src/float.ts
Expand Up @@ -24,3 +24,27 @@ export const floatToSortableInt = (x: number) => {
const i = floatToIntBits(x);
return x < 0 ? ~i | (1 << 31) : i;
};

const clamp11 = (x: number) => (x < -1 ? -1 : x > 1 ? 1 : x);

export const f32u8 = (x: number) => (clamp11(x) * 0x7f) & 0xff;

export const f32u16 = (x: number) => (clamp11(x) * 0x7fff) & 0xffff;

export const f32u24 = (x: number) => (clamp11(x) * 0x7fffff) & 0xffffff;

export const f32u32 = (x: number) => (clamp11(x) * 0x7fffffff) >>> 0;

export const u8f32 = (x: number) => (
(x &= 0xff), (x | ((x >> 7) * 0xffffff00)) / 0x7f
);

export const u16f32 = (x: number) => (
(x &= 0xffff), (x | ((x >> 15) * 0xffff0000)) / 0x7fff
);

export const u24f32 = (x: number) => (
(x &= 0xffffff), (x | ((x >> 23) * 0xff000000)) / 0x7fffff
);

export const u32f32 = (x: number) => (x | 0) / 0x7fffffff;

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