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Merge pull request #61934 from Geometror/hashfuncs

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Hash function improvements
This commit is contained in:
Rémi Verschelde 2022-06-15 07:34:43 +02:00 committed by GitHub
commit 632b933a03
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GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 125 additions and 154 deletions
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175
core/templates/hashfuncs.h
View File

@ -56,7 +56,7 @@
* @param C String
* @return 32-bits hashcode
*/
static inline uint32_t hash_djb2(const char *p_cstr) {
static _FORCE_INLINE_ uint32_t hash_djb2(const char *p_cstr) {
const unsigned char *chr = (const unsigned char *)p_cstr;
uint32_t hash = 5381;
uint32_t c;
@ -68,7 +68,7 @@ static inline uint32_t hash_djb2(const char *p_cstr) {
return hash;
}
static inline uint32_t hash_djb2_buffer(const uint8_t *p_buff, int p_len, uint32_t p_prev = 5381) {
static _FORCE_INLINE_ uint32_t hash_djb2_buffer(const uint8_t *p_buff, int p_len, uint32_t p_prev = 5381) {
uint32_t hash = p_prev;
for (int i = 0; i < p_len; i++) {
@ -78,7 +78,7 @@ static inline uint32_t hash_djb2_buffer(const uint8_t *p_buff, int p_len, uint32
return hash;
}
static inline uint32_t hash_djb2_one_32(uint32_t p_in, uint32_t p_prev = 5381) {
static _FORCE_INLINE_ uint32_t hash_djb2_one_32(uint32_t p_in, uint32_t p_prev = 5381) {
return ((p_prev << 5) + p_prev) + p_in;
}
@ -89,7 +89,7 @@ static inline uint32_t hash_djb2_one_32(uint32_t p_in, uint32_t p_prev = 5381) {
* @param p_int - 64-bit unsigned integer key to be hashed
* @return unsigned 32-bit value representing hashcode
*/
static inline uint32_t hash_one_uint64(const uint64_t p_int) {
static _FORCE_INLINE_ uint32_t hash_one_uint64(const uint64_t p_int) {
uint64_t v = p_int;
v = (~v) + (v << 18); // v = (v << 18) - v - 1;
v = v ^ (v >> 31);
@ -100,7 +100,72 @@ static inline uint32_t hash_one_uint64(const uint64_t p_int) {
return uint32_t(v);
}
static inline uint32_t hash_djb2_one_float(double p_in, uint32_t p_prev = 5381) {
// Murmurhash3 32-bit version.
// All MurmurHash versions are public domain software, and the author disclaims all copyright to their code.
static _FORCE_INLINE_ uint32_t rotl32(uint32_t x, int8_t r) {
return (x << r) | (x >> (32 - r));
}
static _FORCE_INLINE_ uint32_t fmix32(uint32_t h) {
h ^= h >> 16;
h *= 0x85ebca6b;
h ^= h >> 13;
h *= 0xc2b2ae35;
h ^= h >> 16;
return h;
}
static _FORCE_INLINE_ uint32_t hash_murmur3_32(const void *key, int length, const uint32_t seed = 0x7F07C65) {
// Although not required, this is a random prime number.
const uint8_t *data = (const uint8_t *)key;
const int nblocks = length / 4;
uint32_t h1 = seed;
const uint32_t c1 = 0xcc9e2d51;
const uint32_t c2 = 0x1b873593;
const uint32_t *blocks = (const uint32_t *)(data + nblocks * 4);
for (int i = -nblocks; i; i++) {
uint32_t k1 = blocks[i];
k1 *= c1;
k1 = rotl32(k1, 15);
k1 *= c2;
h1 ^= k1;
h1 = rotl32(h1, 13);
h1 = h1 * 5 + 0xe6546b64;
}
const uint8_t *tail = (const uint8_t *)(data + nblocks * 4);
uint32_t k1 = 0;
switch (length & 3) {
case 3:
k1 ^= tail[2] << 16;
[[fallthrough]];
case 2:
k1 ^= tail[1] << 8;
[[fallthrough]];
case 1:
k1 ^= tail[0];
k1 *= c1;
k1 = rotl32(k1, 15);
k1 *= c2;
h1 ^= k1;
};
// Finalize with additional bit mixing.
h1 ^= length;
return fmix32(h1);
}
static _FORCE_INLINE_ uint32_t hash_djb2_one_float(double p_in, uint32_t p_prev = 5381) {
union {
double d;
uint64_t i;
@ -119,7 +184,7 @@ static inline uint32_t hash_djb2_one_float(double p_in, uint32_t p_prev = 5381)
}
template <class T>
static inline uint32_t make_uint32_t(T p_in) {
static _FORCE_INLINE_ uint32_t make_uint32_t(T p_in) {
union {
T t;
uint32_t _u32;
@ -129,7 +194,7 @@ static inline uint32_t make_uint32_t(T p_in) {
return _u._u32;
}
static inline uint64_t hash_djb2_one_float_64(double p_in, uint64_t p_prev = 5381) {
static _FORCE_INLINE_ uint64_t hash_djb2_one_float_64(double p_in, uint64_t p_prev = 5381) {
union {
double d;
uint64_t i;
@ -147,12 +212,12 @@ static inline uint64_t hash_djb2_one_float_64(double p_in, uint64_t p_prev = 538
return ((p_prev << 5) + p_prev) + u.i;
}
static inline uint64_t hash_djb2_one_64(uint64_t p_in, uint64_t p_prev = 5381) {
static _FORCE_INLINE_ uint64_t hash_djb2_one_64(uint64_t p_in, uint64_t p_prev = 5381) {
return ((p_prev << 5) + p_prev) + p_in;
}
template <class T>
static inline uint64_t make_uint64_t(T p_in) {
static _FORCE_INLINE_ uint64_t make_uint64_t(T p_in) {
union {
T t;
uint64_t _u64;
@ -167,78 +232,40 @@ template <class T>
class Ref;
struct HashMapHasherDefault {
static _FORCE_INLINE_ uint32_t hash(const String &p_string) { return p_string.hash(); }
static _FORCE_INLINE_ uint32_t hash(const char *p_cstr) { return hash_djb2(p_cstr); }
static _FORCE_INLINE_ uint32_t hash(const uint64_t p_int) { return hash_one_uint64(p_int); }
static _FORCE_INLINE_ uint32_t hash(const ObjectID &p_id) { return hash_one_uint64(p_id); }
static _FORCE_INLINE_ uint32_t hash(const int64_t p_int) { return hash(uint64_t(p_int)); }
static _FORCE_INLINE_ uint32_t hash(const float p_float) { return hash_djb2_one_float(p_float); }
static _FORCE_INLINE_ uint32_t hash(const double p_double) { return hash_djb2_one_float(p_double); }
static _FORCE_INLINE_ uint32_t hash(const uint32_t p_int) { return p_int; }
static _FORCE_INLINE_ uint32_t hash(const int32_t p_int) { return (uint32_t)p_int; }
static _FORCE_INLINE_ uint32_t hash(const uint16_t p_int) { return p_int; }
static _FORCE_INLINE_ uint32_t hash(const int16_t p_int) { return (uint32_t)p_int; }
static _FORCE_INLINE_ uint32_t hash(const uint8_t p_int) { return p_int; }
static _FORCE_INLINE_ uint32_t hash(const int8_t p_int) { return (uint32_t)p_int; }
static _FORCE_INLINE_ uint32_t hash(const wchar_t p_wchar) { return (uint32_t)p_wchar; }
static _FORCE_INLINE_ uint32_t hash(const char16_t p_uchar) { return (uint32_t)p_uchar; }
static _FORCE_INLINE_ uint32_t hash(const char32_t p_uchar) { return (uint32_t)p_uchar; }
static _FORCE_INLINE_ uint32_t hash(const RID &p_rid) { return hash_one_uint64(p_rid.get_id()); }
static _FORCE_INLINE_ uint32_t hash(const StringName &p_string_name) { return p_string_name.hash(); }
static _FORCE_INLINE_ uint32_t hash(const NodePath &p_path) { return p_path.hash(); }
// Generic hash function for any type.
template <class T>
static _FORCE_INLINE_ uint32_t hash(const T *p_pointer) { return hash_one_uint64((uint64_t)p_pointer); }
template <class T>
static _FORCE_INLINE_ uint32_t hash(const Ref<T> &p_ref) { return hash_one_uint64((uint64_t)p_ref.operator->()); }
static _FORCE_INLINE_ uint32_t hash(const Vector2i &p_vec) {
uint32_t h = hash_djb2_one_32(p_vec.x);
return hash_djb2_one_32(p_vec.y, h);
}
static _FORCE_INLINE_ uint32_t hash(const Vector3i &p_vec) {
uint32_t h = hash_djb2_one_32(p_vec.x);
h = hash_djb2_one_32(p_vec.y, h);
return hash_djb2_one_32(p_vec.z, h);
}
static _FORCE_INLINE_ uint32_t hash(const String &p_string) { return p_string.hash(); }
static _FORCE_INLINE_ uint32_t hash(const char *p_cstr) { return hash_djb2(p_cstr); }
static _FORCE_INLINE_ uint32_t hash(const wchar_t p_wchar) { return fmix32(p_wchar); }
static _FORCE_INLINE_ uint32_t hash(const char16_t p_uchar) { return fmix32(p_uchar); }
static _FORCE_INLINE_ uint32_t hash(const char32_t p_uchar) { return fmix32(p_uchar); }
static _FORCE_INLINE_ uint32_t hash(const RID &p_rid) { return hash_one_uint64(p_rid.get_id()); }
static _FORCE_INLINE_ uint32_t hash(const StringName &p_string_name) { return p_string_name.hash(); }
static _FORCE_INLINE_ uint32_t hash(const NodePath &p_path) { return p_path.hash(); }
static _FORCE_INLINE_ uint32_t hash(const ObjectID &p_id) { return hash_one_uint64(p_id); }
static _FORCE_INLINE_ uint32_t hash(const Vector2 &p_vec) {
uint32_t h = hash_djb2_one_float(p_vec.x);
return hash_djb2_one_float(p_vec.y, h);
}
static _FORCE_INLINE_ uint32_t hash(const Vector3 &p_vec) {
uint32_t h = hash_djb2_one_float(p_vec.x);
h = hash_djb2_one_float(p_vec.y, h);
return hash_djb2_one_float(p_vec.z, h);
}
static _FORCE_INLINE_ uint32_t hash(const Rect2i &p_rect) {
uint32_t h = hash_djb2_one_32(p_rect.position.x);
h = hash_djb2_one_32(p_rect.position.y, h);
h = hash_djb2_one_32(p_rect.size.x, h);
return hash_djb2_one_32(p_rect.size.y, h);
}
static _FORCE_INLINE_ uint32_t hash(const Rect2 &p_rect) {
uint32_t h = hash_djb2_one_float(p_rect.position.x);
h = hash_djb2_one_float(p_rect.position.y, h);
h = hash_djb2_one_float(p_rect.size.x, h);
return hash_djb2_one_float(p_rect.size.y, h);
}
static _FORCE_INLINE_ uint32_t hash(const AABB &p_aabb) {
uint32_t h = hash_djb2_one_float(p_aabb.position.x);
h = hash_djb2_one_float(p_aabb.position.y, h);
h = hash_djb2_one_float(p_aabb.position.z, h);
h = hash_djb2_one_float(p_aabb.size.x, h);
h = hash_djb2_one_float(p_aabb.size.y, h);
return hash_djb2_one_float(p_aabb.size.z, h);
}
//static _FORCE_INLINE_ uint32_t hash(const void* p_ptr) { return uint32_t(uint64_t(p_ptr))*(0x9e3779b1L); }
static _FORCE_INLINE_ uint32_t hash(const uint64_t p_int) { return hash_one_uint64(p_int); }
static _FORCE_INLINE_ uint32_t hash(const int64_t p_int) { return hash_one_uint64(p_int); }
static _FORCE_INLINE_ uint32_t hash(const float p_float) { return hash_djb2_one_float(p_float); }
static _FORCE_INLINE_ uint32_t hash(const double p_double) { return hash_djb2_one_float(p_double); }
static _FORCE_INLINE_ uint32_t hash(const uint32_t p_int) { return fmix32(p_int); }
static _FORCE_INLINE_ uint32_t hash(const int32_t p_int) { return fmix32(p_int); }
static _FORCE_INLINE_ uint32_t hash(const uint16_t p_int) { return fmix32(p_int); }
static _FORCE_INLINE_ uint32_t hash(const int16_t p_int) { return fmix32(p_int); }
static _FORCE_INLINE_ uint32_t hash(const uint8_t p_int) { return fmix32(p_int); }
static _FORCE_INLINE_ uint32_t hash(const int8_t p_int) { return fmix32(p_int); }
static _FORCE_INLINE_ uint32_t hash(const Vector2i &p_vec) { return hash_murmur3_32(&p_vec, sizeof(Vector2i)); }
static _FORCE_INLINE_ uint32_t hash(const Vector3i &p_vec) { return hash_murmur3_32(&p_vec, sizeof(Vector3i)); }
static _FORCE_INLINE_ uint32_t hash(const Vector2 &p_vec) { return hash_murmur3_32(&p_vec, sizeof(Vector2)); }
static _FORCE_INLINE_ uint32_t hash(const Vector3 &p_vec) { return hash_murmur3_32(&p_vec, sizeof(Vector3)); }
static _FORCE_INLINE_ uint32_t hash(const Rect2i &p_rect) { return hash_murmur3_32(&p_rect, sizeof(Rect2i)); }
static _FORCE_INLINE_ uint32_t hash(const Rect2 &p_rect) { return hash_murmur3_32(&p_rect, sizeof(Rect2)); }
static _FORCE_INLINE_ uint32_t hash(const AABB &p_aabb) { return hash_murmur3_32(&p_aabb, sizeof(AABB)); }
};
template <typename T>

96
core/variant/variant.cpp
View File

@ -2788,106 +2788,50 @@ uint32_t Variant::recursive_hash(int recursion_count) const {
// math types
case VECTOR2: {
uint32_t hash = hash_djb2_one_float(reinterpret_cast<const Vector2 *>(_data._mem)->x);
return hash_djb2_one_float(reinterpret_cast<const Vector2 *>(_data._mem)->y, hash);
return hash_murmur3_32(reinterpret_cast<const Vector2 *>(_data._mem), sizeof(Vector2));
} break;
case VECTOR2I: {
uint32_t hash = hash_djb2_one_32((uint32_t) reinterpret_cast<const Vector2i *>(_data._mem)->x);
return hash_djb2_one_32((uint32_t) reinterpret_cast<const Vector2i *>(_data._mem)->y, hash);
return hash_murmur3_32(reinterpret_cast<const Vector2i *>(_data._mem), sizeof(Vector2i));
} break;
case RECT2: {
uint32_t hash = hash_djb2_one_float(reinterpret_cast<const Rect2 *>(_data._mem)->position.x);
hash = hash_djb2_one_float(reinterpret_cast<const Rect2 *>(_data._mem)->position.y, hash);
hash = hash_djb2_one_float(reinterpret_cast<const Rect2 *>(_data._mem)->size.x, hash);
return hash_djb2_one_float(reinterpret_cast<const Rect2 *>(_data._mem)->size.y, hash);
return hash_murmur3_32(reinterpret_cast<const Rect2 *>(_data._mem), sizeof(Rect2));
} break;
case RECT2I: {
uint32_t hash = hash_djb2_one_32((uint32_t) reinterpret_cast<const Rect2i *>(_data._mem)->position.x);
hash = hash_djb2_one_32((uint32_t) reinterpret_cast<const Rect2i *>(_data._mem)->position.y, hash);
hash = hash_djb2_one_32((uint32_t) reinterpret_cast<const Rect2i *>(_data._mem)->size.x, hash);
return hash_djb2_one_32((uint32_t) reinterpret_cast<const Rect2i *>(_data._mem)->size.y, hash);
return hash_murmur3_32(reinterpret_cast<const Rect2i *>(_data._mem), sizeof(Rect2i));
} break;
case TRANSFORM2D: {
uint32_t hash = 5831;
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 2; j++) {
hash = hash_djb2_one_float(_data._transform2d->columns[i][j], hash);
}
}
return hash;
return hash_murmur3_32(reinterpret_cast<const Transform2D *>(_data._transform2d), sizeof(Transform2D));
} break;
case VECTOR3: {
uint32_t hash = hash_djb2_one_float(reinterpret_cast<const Vector3 *>(_data._mem)->x);
hash = hash_djb2_one_float(reinterpret_cast<const Vector3 *>(_data._mem)->y, hash);
return hash_djb2_one_float(reinterpret_cast<const Vector3 *>(_data._mem)->z, hash);
return hash_murmur3_32(reinterpret_cast<const Vector3 *>(_data._mem), sizeof(Vector3));
} break;
case VECTOR3I: {
uint32_t hash = hash_djb2_one_32((uint32_t) reinterpret_cast<const Vector3i *>(_data._mem)->x);
hash = hash_djb2_one_32((uint32_t) reinterpret_cast<const Vector3i *>(_data._mem)->y, hash);
return hash_djb2_one_32((uint32_t) reinterpret_cast<const Vector3i *>(_data._mem)->z, hash);
return hash_murmur3_32(reinterpret_cast<const Vector3i *>(_data._mem), sizeof(Vector3i));
} break;
case PLANE: {
uint32_t hash = hash_djb2_one_float(reinterpret_cast<const Plane *>(_data._mem)->normal.x);
hash = hash_djb2_one_float(reinterpret_cast<const Plane *>(_data._mem)->normal.y, hash);
hash = hash_djb2_one_float(reinterpret_cast<const Plane *>(_data._mem)->normal.z, hash);
return hash_djb2_one_float(reinterpret_cast<const Plane *>(_data._mem)->d, hash);
return hash_murmur3_32(reinterpret_cast<const Plane *>(_data._mem), sizeof(Plane));
} break;
case AABB: {
uint32_t hash = 5831;
for (int i = 0; i < 3; i++) {
hash = hash_djb2_one_float(_data._aabb->position[i], hash);
hash = hash_djb2_one_float(_data._aabb->size[i], hash);
}
return hash;
return hash_murmur3_32(_data._aabb, sizeof(AABB));
} break;
case QUATERNION: {
uint32_t hash = hash_djb2_one_float(reinterpret_cast<const Quaternion *>(_data._mem)->x);
hash = hash_djb2_one_float(reinterpret_cast<const Quaternion *>(_data._mem)->y, hash);
hash = hash_djb2_one_float(reinterpret_cast<const Quaternion *>(_data._mem)->z, hash);
return hash_djb2_one_float(reinterpret_cast<const Quaternion *>(_data._mem)->w, hash);
return hash_murmur3_32(reinterpret_cast<const Quaternion *>(_data._mem), sizeof(Quaternion));
} break;
case BASIS: {
uint32_t hash = 5831;
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
hash = hash_djb2_one_float(_data._basis->rows[i][j], hash);
}
}
return hash;
return hash_murmur3_32(_data._basis, sizeof(Basis));
} break;
case TRANSFORM3D: {
uint32_t hash = 5831;
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
hash = hash_djb2_one_float(_data._transform3d->basis.rows[i][j], hash);
}
hash = hash_djb2_one_float(_data._transform3d->origin[i], hash);
}
return hash;
return hash_murmur3_32(_data._transform3d, sizeof(Transform3D));
} break;
// misc types
case COLOR: {
uint32_t hash = hash_djb2_one_float(reinterpret_cast<const Color *>(_data._mem)->r);
hash = hash_djb2_one_float(reinterpret_cast<const Color *>(_data._mem)->g, hash);
hash = hash_djb2_one_float(reinterpret_cast<const Color *>(_data._mem)->b, hash);
return hash_djb2_one_float(reinterpret_cast<const Color *>(_data._mem)->a, hash);
return hash_murmur3_32(reinterpret_cast<const Color *>(_data._mem), sizeof(Color));
} break;
case RID: {
return hash_djb2_one_64(reinterpret_cast<const ::RID *>(_data._mem)->get_id());
return hash_one_uint64(reinterpret_cast<const ::RID *>(_data._mem)->get_id());
} break;
case OBJECT: {
return hash_djb2_one_64(make_uint64_t(_get_obj().obj));
return hash_one_uint64(make_uint64_t(_get_obj().obj));
} break;
case STRING_NAME: {
return reinterpret_cast<const StringName *>(_data._mem)->hash();
@ -2918,7 +2862,7 @@ uint32_t Variant::recursive_hash(int recursion_count) const {
int len = arr.size();
if (likely(len)) {
const uint8_t *r = arr.ptr();
return hash_djb2_buffer((uint8_t *)&r[0], len);
return hash_murmur3_32((uint8_t *)&r[0], len);
} else {
return hash_djb2_one_64(0);
}
@ -2929,7 +2873,7 @@ uint32_t Variant::recursive_hash(int recursion_count) const {
int len = arr.size();
if (likely(len)) {
const int32_t *r = arr.ptr();
return hash_djb2_buffer((uint8_t *)&r[0], len * sizeof(int32_t));
return hash_murmur3_32((uint8_t *)&r[0], len * sizeof(int32_t));
} else {
return hash_djb2_one_64(0);
}
@ -2940,7 +2884,7 @@ uint32_t Variant::recursive_hash(int recursion_count) const {
int len = arr.size();
if (likely(len)) {
const int64_t *r = arr.ptr();
return hash_djb2_buffer((uint8_t *)&r[0], len * sizeof(int64_t));
return hash_murmur3_32((uint8_t *)&r[0], len * sizeof(int64_t));
} else {
return hash_djb2_one_64(0);
}
@ -2952,7 +2896,7 @@ uint32_t Variant::recursive_hash(int recursion_count) const {
if (likely(len)) {
const float *r = arr.ptr();
return hash_djb2_buffer((uint8_t *)&r[0], len * sizeof(float));
return hash_murmur3_32((uint8_t *)&r[0], len * sizeof(float));
} else {
return hash_djb2_one_float(0.0);
}
@ -2964,7 +2908,7 @@ uint32_t Variant::recursive_hash(int recursion_count) const {
if (likely(len)) {
const double *r = arr.ptr();
return hash_djb2_buffer((uint8_t *)&r[0], len * sizeof(double));
return hash_murmur3_32((uint8_t *)&r[0], len * sizeof(double));
} else {
return hash_djb2_one_float(0.0);
}

2
modules/text_server_adv/text_server_adv.cpp
View File

@ -2852,7 +2852,7 @@ Vector2 TextServerAdvanced::font_get_kerning(const RID &p_font_rid, int64_t p_si
ERR_FAIL_COND_V(!_ensure_cache_for_size(fd, size), Vector2());
const HashMap<Vector2i, Vector2, VariantHasher, VariantComparator> &kern = fd->cache[size]->kerning_map;
const HashMap<Vector2i, Vector2> &kern = fd->cache[size]->kerning_map;
if (kern.has(p_glyph_pair)) {
if (fd->msdf) {

2
modules/text_server_adv/text_server_adv.h
View File

@ -191,7 +191,7 @@ class TextServerAdvanced : public TextServerExtension {
Vector<FontTexture> textures;
HashMap<int32_t, FontGlyph> glyph_map;
HashMap<Vector2i, Vector2, VariantHasher, VariantComparator> kerning_map;
HashMap<Vector2i, Vector2> kerning_map;
hb_font_t *hb_handle = nullptr;
#ifdef MODULE_FREETYPE_ENABLED

2
modules/text_server_fb/text_server_fb.cpp
View File

@ -2000,7 +2000,7 @@ Vector2 TextServerFallback::font_get_kerning(const RID &p_font_rid, int64_t p_si
ERR_FAIL_COND_V(!_ensure_cache_for_size(fd, size), Vector2());
const HashMap<Vector2i, Vector2, VariantHasher, VariantComparator> &kern = fd->cache[size]->kerning_map;
const HashMap<Vector2i, Vector2> &kern = fd->cache[size]->kerning_map;
if (kern.has(p_glyph_pair)) {
if (fd->msdf) {

2
modules/text_server_fb/text_server_fb.h
View File

@ -159,7 +159,7 @@ class TextServerFallback : public TextServerExtension {
Vector<FontTexture> textures;
HashMap<int32_t, FontGlyph> glyph_map;
HashMap<Vector2i, Vector2, VariantHasher, VariantComparator> kerning_map;
HashMap<Vector2i, Vector2> kerning_map;
#ifdef MODULE_FREETYPE_ENABLED
FT_Face face = nullptr;