d8223ffa75
That year should bring the long-awaited OpenGL ES 3.0 compatible renderer
with state-of-the-art rendering techniques tuned to work as low as middle
end handheld devices - without compromising with the possibilities given
for higher end desktop games of course. Great times ahead for the Godot
community and the gamers that will play our games!
(cherry picked from commit c7bc44d5ad)
119 lines
3.5 KiB
C++
119 lines
3.5 KiB
C++
/*************************************************************************/
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/* hashfuncs.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* http://www.godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifndef HASHFUNCS_H
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#define HASHFUNCS_H
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#include "typedefs.h"
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/**
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* Hashing functions
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*/
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/**
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* DJB2 Hash function
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* @param C String
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* @return 32-bits hashcode
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*/
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static inline uint32_t hash_djb2(const char *p_cstr) {
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const unsigned char* chr=(const unsigned char*)p_cstr;
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uint32_t hash = 5381;
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uint32_t c;
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while ((c = *chr++))
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hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
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return hash;
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}
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static inline uint32_t hash_djb2_buffer(const uint8_t *p_buff, int p_len,uint32_t p_prev=5381) {
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uint32_t hash = p_prev;
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for(int i=0;i<p_len;i++)
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hash = ((hash << 5) + hash) + p_buff[i]; /* hash * 33 + c */
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return hash;
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}
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static inline uint32_t hash_djb2_one_32(uint32_t p_in,uint32_t p_prev=5381) {
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return ((p_prev<<5)+p_prev)+p_in;
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}
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static inline uint32_t hash_djb2_one_float(float p_in,uint32_t p_prev=5381) {
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union {
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float f;
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uint32_t i;
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} u;
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// handle -0 case
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if (p_in==0.0f) u.f=0.0f;
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else u.f=p_in;
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return ((p_prev<<5)+p_prev)+u.i;
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}
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template<class T>
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static inline uint32_t make_uint32_t(T p_in) {
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union {
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T t;
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uint32_t _u32;
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} _u;
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_u._u32=0;
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_u.t=p_in;
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return _u._u32;
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}
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static inline uint64_t hash_djb2_one_64(uint64_t p_in,uint64_t p_prev=5381) {
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return ((p_prev<<5)+p_prev)+p_in;
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}
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template<class T>
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static inline uint64_t make_uint64_t(T p_in) {
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union {
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T t;
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uint64_t _u64;
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} _u;
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_u._u64=0; // in case p_in is smaller
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_u.t=p_in;
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return _u._u64;
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}
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#endif
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