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| author | Rémi Verschelde <rverschelde@gmail.com> | 2017-12-17 14:27:51 +0100 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2017-12-17 14:27:51 +0100 |
| commit | 539fd14cf5940896c90eeb141e9bfee3b31c3ca9 (patch) | |
| tree | 24f0e2c856943444c714accc8c15457cde7d7981 | |
| parent | dbae2d98e3ea1441673e5b3506e7a73bed72eb07 (diff) | |
| parent | be4448bd1fa8c75f95d8583a3f1a7d1cf6159bc2 (diff) | |
Merge pull request #14758 from hpvb/optimize-lightbaker-rng
Use a more naive RNG for the lightmapper
| -rw-r--r-- | scene/3d/voxel_light_baker.cpp | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/scene/3d/voxel_light_baker.cpp b/scene/3d/voxel_light_baker.cpp index c05dfddeca..60e86362b3 100644 --- a/scene/3d/voxel_light_baker.cpp +++ b/scene/3d/voxel_light_baker.cpp @@ -1614,6 +1614,18 @@ Vector3 VoxelLightBaker::_compute_pixel_light_at_pos(const Vector3 &p_pos, const return accum; } +uint32_t xorshiftstate[] = { 123 }; // anything non-zero will do here + +_ALWAYS_INLINE_ uint32_t xorshift32() { + /* Algorithm "xor" from p. 4 of Marsaglia, "Xorshift RNGs" */ + uint32_t x = xorshiftstate[0]; + x ^= x << 13; + x ^= x >> 17; + x ^= x << 5; + xorshiftstate[0] = x; + return x; +} + Vector3 VoxelLightBaker::_compute_ray_trace_at_pos(const Vector3 &p_pos, const Vector3 &p_normal) { int samples_per_quality[3] = { 48, 128, 512 }; @@ -1638,9 +1650,9 @@ Vector3 VoxelLightBaker::_compute_ray_trace_at_pos(const Vector3 &p_pos, const V for (int i = 0; i < samples; i++) { - float random_angle1 = (((Math::rand() % 65535) / 65535.0) * 2.0 - 1.0) * spread; + float random_angle1 = (((xorshift32() % 65535) / 65535.0) * 2.0 - 1.0) * spread; Vector3 axis(0, sin(random_angle1), cos(random_angle1)); - float random_angle2 = ((Math::rand() % 65535) / 65535.0) * Math_PI * 2.0; + float random_angle2 = ((xorshift32() % 65535) / 65535.0) * Math_PI * 2.0; Basis rot(Vector3(0, 0, 1), random_angle2); axis = rot.xform(axis); |