lerp_lut.h

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#ifndef LERP_LUT_H
#define LERP_LUT_H
 
#include <stddef.h>
 
typedef struct {
    float key;
    float value;
} lut_entry_t;
 
typedef struct {
    const lut_entry_t *entries;
    size_t size;
} lerp_lut_t;
 
#define LERP_LUT_INIT(name, _entries, _size) \
    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")
 
float lut_lookup(const lerp_lut_t *lut, float key);
 
#endif // LERP_LUT_H