lerp_lut.h File Reference

Linear interpolation lookup table (LUT). More...

#include <stddef.h>

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Classes
struct	lut_entry_t
struct	lerp_lut_t

Macros
#define	LERP_LUT_INIT(name, _entries, _size)

Functions
float	lut_lookup (const lerp_lut_t *lut, float key)
	Lookup a value in a linear interpolation lookup table (LUT).

Detailed Description

Linear interpolation lookup table (LUT).

Author

Irving Wang (irvin.nosp@m.gw@p.nosp@m.urdue.nosp@m..edu)

Macro Definition Documentation

LERP_LUT_INIT

#define LERP_LUT_INIT	(		name,
			_entries,
			_size )

Value:

    const lerp_lut_t name = { \
        .entries = _entries, \
        .size    = _size, \
    }; \
    static_assert(sizeof(_entries) / sizeof(lut_entry_t) == _size, \
                  "Entries array size must match _size"); \
    static_assert(_size > 1, "LUT size must be greater than 1")

Function Documentation

lut_lookup()

float lut_lookup	(	const lerp_lut_t *	lut,
		float	key )

Lookup a value in a linear interpolation lookup table (LUT).

This function performs a binary search to find the appropriate interval in the LUT and then linearly interpolates between the two nearest entries.

Parameters

lut	Pointer to the LUT.
key	The key to look up.

Returns

The interpolated value.

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