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Fix some issues with dithering.

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This commit is contained in:
David Reid
2019-09-29 17:11:27 +10:00
parent 6cf6f3f9d8
commit 9043985ce6
1 changed files with 14 additions and 6 deletions
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miniaudio.h
+14 -6
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@@ -4232,7 +4232,7 @@ for miniaudio's purposes.
#define MA_LCG_M 2147483647 #define MA_LCG_M 2147483647
#define MA_LCG_A 48271 #define MA_LCG_A 48271
#define MA_LCG_C 0 #define MA_LCG_C 0
static ma_int32 g_maLCG; static ma_int32 g_maLCG = 4321; /* Non-zero initial seed. Use ma_seed() to use an explicit seed. */
void ma_seed(ma_int32 seed) void ma_seed(ma_int32 seed)
{ {
@@ -4247,9 +4247,14 @@ ma_int32 ma_rand_s32()
return r; return r;
} }
ma_uint32 ma_rand_u32()
{
return (ma_uint32)ma_rand_s32();
}
double ma_rand_f64() double ma_rand_f64()
{ {
return (ma_rand_s32() + 0x80000000) / (double)0x7FFFFFFF; return ma_rand_s32() / (double)0x7FFFFFFF;
} }
float ma_rand_f32() float ma_rand_f32()
@@ -4257,15 +4262,18 @@ float ma_rand_f32()
return (float)ma_rand_f64(); return (float)ma_rand_f64();
} }
static MA_INLINE float ma_rand_range_f32(float lo, float hi) float ma_rand_range_f32(float lo, float hi)
{ {
return ma_scale_to_range_f32(ma_rand_f32(), lo, hi); return ma_scale_to_range_f32(ma_rand_f32(), lo, hi);
} }
static MA_INLINE ma_int32 ma_rand_range_s32(ma_int32 lo, ma_int32 hi) ma_int32 ma_rand_range_s32(ma_int32 lo, ma_int32 hi)
{ {
double x = ma_rand_f64(); if (lo == hi) {
return lo + (ma_int32)(x*(hi-lo)); return lo;
}
return lo + ma_rand_u32() / (0xFFFFFFFF / (hi - lo + 1) + 1);
} }