75 lines
1.7 KiB
V
75 lines
1.7 KiB
V
// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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module rand
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// TODO: Remove these functions once done:
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// 1. C.rand()
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// 2. seed()
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// 3. next()
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// 4. rand_r()
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// fn C.rand() int
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pub fn seed(s int) {
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C.srand(s)
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}
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pub fn next(max int) int {
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return C.rand() % max
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}
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// rand_r returns a pseudo-random number;
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// writes a result value to the seed argument.
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pub fn rand_r(seed &int) int {
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ns := *seed * 1103515245 + 12345
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unsafe {
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(*seed) = ns
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}
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return ns & 0x7fffffff
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}
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pub struct PRNGConfigStruct {
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seed []u32 = time_seed_array(2)
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}
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pub fn new_default(config PRNGConfigStruct) &WyRandRNG {
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rng := &WyRandRNG{}
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rng.seed(config.seed)
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return rng
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}
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// rand_f32 return a random f32 between 0 and max
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[deprecated]
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pub fn rand_f32(max f32) f32 {
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return rand_uniform_f32() * max
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}
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// rand_f32 return a random f32 in range min and max
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[deprecated]
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pub fn rand_f32_in_range(min, max f32) f32 {
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return min + rand_uniform_f32() * (max - min)
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}
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// rand_f64 return a random f64 between 0 (inclusive) and max (exclusive)
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[deprecated]
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pub fn rand_f64(max f64) f64 {
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return rand_uniform_f64() * max
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}
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// rand_f64 return a random f64 in range min (inclusive) and max (exclusive)
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[deprecated]
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pub fn rand_f64_in_range(min, max f64) f64 {
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return min + rand_uniform_f64() * (max - min)
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}
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// rand_uniform_f32 returns a uniformly distributed f32 in the range 0 (inclusive) and 1 (exclusive)
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[deprecated]
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pub fn rand_uniform_f32() f32 {
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return f32(C.rand()) / f32(C.RAND_MAX)
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}
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// rand_uniform_f64 returns a uniformly distributed f64 in the range 0 (inclusive) and 1 (exclusive)
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[deprecated]
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pub fn rand_uniform_f64() f64 {
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return f64(C.rand()) / f64(C.RAND_MAX)
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}
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