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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| // | ||
| // JTRandom.h | ||
| // jtracer | ||
| // | ||
| // Created by Jonathon Racz on 1/4/18. | ||
| // Copyright © 2018 jonathonracz. All rights reserved. | ||
| // | ||
|
|
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| #pragma once | ||
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| #include <simd/simd.h> | ||
| #include "JTTypes.h" | ||
| #include "JTShaderTypes.h" | ||
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| namespace jt | ||
| { | ||
|
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| class PRNG | ||
| { | ||
| public: | ||
| PRNG() | ||
| { | ||
| } | ||
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| ~PRNG() = default; | ||
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| uint32 generate() | ||
| { | ||
| uint32 t = (x ^ (x >> 2)); | ||
| x = y; | ||
| y = z; | ||
| z = w; | ||
| w = v; | ||
| v = (v ^ (v << 4)) ^ (t ^ (t << 1)); | ||
| return (d += 362437) + v; | ||
| } | ||
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| float generateNormal() | ||
| { | ||
| // TODO: in a distributed raytracing situation, this should be | ||
| // 0 <= x < 1, but currently it's 0 <= x <= 1. | ||
| return generate() / static_cast<float>(JT_UINT32_MAX); | ||
| } | ||
|
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| private: | ||
| uint32 x = 123456789; | ||
| uint32 y = 362436069; | ||
| uint32 z = 521288629; | ||
| uint32 w = 88675123; | ||
| uint32 v = 5783321; | ||
| uint32 d = 6615241; | ||
| }; | ||
|
|
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| }; |
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