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comparison foosdk/sdk/foobar2000/SDK/genrand.h @ 1:20d02a178406 default tip

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author Paper <paper@tflc.us>
date Mon, 05 Jan 2026 02:15:46 -0500
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0:e9bb126753e7 1:20d02a178406
1 #pragma once
2 //! PRNG service. Implemented by the core, do not reimplement. Use g_create() helper function to instantiate.
3 class NOVTABLE genrand_service : public service_base
4 {
5 public:
6 void seedAuto() {seed( 0 ) ;}
7 //! Seeds the PRNG with specified value. \n
8 //! Default value of zero seeds automatically using available system functions.
9 virtual void seed(unsigned val = 0) = 0;
10 //! Returns random value N, where 0 <= N < range.
11 virtual unsigned genrand(unsigned range)=0;
12
13 double genrand_f() { return (double)genrand(0xFFFFFFFF) / (double)0xFFFFFFFF; }
14
15 void genrand_blob( void * out, size_t bytes ) {
16 size_t dwords = bytes/4;
17 uint32_t * out32 = (uint32_t*) out;
18 for(size_t w = 0; w < dwords; ++w ) {
19 out32[w] = genrand32();
20 }
21 size_t left = bytes % 4;
22 if (left > 0) {
23 auto leftptr = (uint8_t*) out + (bytes-left);
24 for( size_t w = 0; w < left; ++w) leftptr[w] = genrand8();
25 }
26 }
27
28 uint32_t genrand32() {
29 return (uint32_t) genrand(0xFFFFFFFF);
30 }
31 uint8_t genrand8() {
32 return (uint8_t) genrand(0x100);
33 }
34
35 static service_ptr_t<genrand_service> g_create() {return standard_api_create_t<genrand_service>();}
36
37 void generate_random_order(t_size * out, t_size count) {
38 unsigned genrandMax = (unsigned) pfc::min_t<size_t>(count, 0xFFFFFFFF);
39 t_size n;
40 for(n=0;n<count;n++) out[n]=n;
41 for(n=0;n<count;n++) pfc::swap_t(out[n],out[genrand(genrandMax)]);
42 }
43
44 FB2K_MAKE_SERVICE_COREAPI(genrand_service);
45 };