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![Rémi Verschelde](/assets/img/avatar_default.png)
Happy new year to the wonderful Godot community!
2020 has been a tough year for most of us personally, but a good year for
Godot development nonetheless with a huge amount of work done towards Godot
4.0 and great improvements backported to the long-lived 3.2 branch.
We've had close to 400 contributors to engine code this year, authoring near
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Here's to a great year 2021 for all Godot users 🎆
188 lines
5 KiB
C++
188 lines
5 KiB
C++
/*************************************************************************/
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/* math_funcs.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
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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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#include "math_funcs.h"
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#include "core/error/error_macros.h"
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RandomPCG Math::default_rand(RandomPCG::DEFAULT_SEED, RandomPCG::DEFAULT_INC);
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uint32_t Math::rand_from_seed(uint64_t *seed) {
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RandomPCG rng = RandomPCG(*seed, RandomPCG::DEFAULT_INC);
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uint32_t r = rng.rand();
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*seed = rng.get_seed();
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return r;
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}
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void Math::seed(uint64_t x) {
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default_rand.seed(x);
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}
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void Math::randomize() {
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default_rand.randomize();
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}
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uint32_t Math::rand() {
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return default_rand.rand();
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}
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int Math::step_decimals(double p_step) {
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static const int maxn = 10;
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static const double sd[maxn] = {
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0.9999, // somehow compensate for floating point error
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0.09999,
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0.009999,
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0.0009999,
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0.00009999,
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0.000009999,
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0.0000009999,
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0.00000009999,
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0.000000009999,
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0.0000000009999
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};
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double abs = Math::abs(p_step);
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double decs = abs - (int)abs; // Strip away integer part
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for (int i = 0; i < maxn; i++) {
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if (decs >= sd[i]) {
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return i;
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}
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}
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return 0;
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}
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// Only meant for editor usage in float ranges, where a step of 0
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// means that decimal digits should not be limited in String::num.
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int Math::range_step_decimals(double p_step) {
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if (p_step < 0.0000000000001) {
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return 16; // Max value hardcoded in String::num
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}
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return step_decimals(p_step);
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}
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double Math::dectime(double p_value, double p_amount, double p_step) {
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double sgn = p_value < 0 ? -1.0 : 1.0;
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double val = Math::abs(p_value);
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val -= p_amount * p_step;
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if (val < 0.0) {
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val = 0.0;
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}
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return val * sgn;
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}
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double Math::ease(double p_x, double p_c) {
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if (p_x < 0) {
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p_x = 0;
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} else if (p_x > 1.0) {
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p_x = 1.0;
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}
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if (p_c > 0) {
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if (p_c < 1.0) {
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return 1.0 - Math::pow(1.0 - p_x, 1.0 / p_c);
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} else {
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return Math::pow(p_x, p_c);
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}
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} else if (p_c < 0) {
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//inout ease
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if (p_x < 0.5) {
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return Math::pow(p_x * 2.0, -p_c) * 0.5;
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} else {
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return (1.0 - Math::pow(1.0 - (p_x - 0.5) * 2.0, -p_c)) * 0.5 + 0.5;
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}
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} else {
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return 0; // no ease (raw)
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}
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}
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double Math::snapped(double p_value, double p_step) {
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if (p_step != 0) {
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p_value = Math::floor(p_value / p_step + 0.5) * p_step;
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}
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return p_value;
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}
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uint32_t Math::larger_prime(uint32_t p_val) {
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static const uint32_t primes[] = {
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5,
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13,
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23,
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47,
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97,
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193,
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389,
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769,
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1543,
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3079,
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6151,
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12289,
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24593,
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49157,
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98317,
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196613,
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393241,
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786433,
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1572869,
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3145739,
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6291469,
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12582917,
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25165843,
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50331653,
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100663319,
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201326611,
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402653189,
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805306457,
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1610612741,
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0,
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};
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int idx = 0;
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while (true) {
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ERR_FAIL_COND_V(primes[idx] == 0, 0);
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if (primes[idx] > p_val) {
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return primes[idx];
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}
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idx++;
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}
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}
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double Math::random(double from, double to) {
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return default_rand.random(from, to);
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}
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float Math::random(float from, float to) {
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return default_rand.random(from, to);
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}
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int Math::random(int from, int to) {
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return default_rand.random(from, to);
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}
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