38 lines
No EOL
971 B
C
38 lines
No EOL
971 B
C
// LCG
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// Meh distribution, but good enough for general purposes
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#define RAND_MAX_64 0xFFFFFFFFFFFFFFFFull
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#define MULTIPLIER 6364136223846793005ull
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#define INCREMENT 1442695040888963407ull
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// #Global
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// set this to something like os_get_current_cycle_count() for very randomized seed
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ogb_instance u64 seed_for_random;
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#if !OOGABOOGA_LINK_EXTERNAL_INSTANCE
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u64 seed_for_random = 1;
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#endif
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u64 get_random() {
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seed_for_random = seed_for_random * MULTIPLIER + INCREMENT;
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return seed_for_random;
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}
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f32 get_random_float32() {
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return (float32)get_random()/(float32)UINT64_MAX;
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}
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f64 get_random_float64() {
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return (float64)get_random()/(float64)UINT64_MAX;
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}
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f32 get_random_float32_in_range(f32 min, f32 max) {
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return (max-min)*get_random_float32()+min;
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}
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f64 get_random_float64_in_range(f64 min, f64 max) {
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return (max-min)*get_random_float64()+min;
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}
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s64 get_random_int_in_range(s64 min, s64 max) {
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return min + (s64)(get_random() % (max - min + 1));
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} |