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Reuse seed when updating stars

The only currently relevant parameter is scale which can now be changed
without resetting stars position
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numberZero authored and lhofhansl committed Nov 26, 2020
1 parent 3077afc commit 560627eef8c02f8201e639c75fcd5301d3a33077
Showing with 6 additions and 3 deletions.
  1. +5 −3 src/client/sky.cpp
  2. +1 −0 src/client/sky.h
@@ -830,6 +830,7 @@ void Sky::setStarCount(u16 star_count, bool force_update)
// Allow force updating star count at game init.
if (m_star_params.count != star_count || force_update) {
m_star_params.count = star_count;
m_seed = (u64)myrand() << 32 | myrand();
updateStars();
}
}
@@ -847,12 +848,13 @@ void Sky::updateStars() {
m_stars->Vertices.reallocate(4 * m_star_params.count);
m_stars->Indices.reallocate(6 * m_star_params.count);

PcgRandom rgen(m_seed);
float d = (0.006 / 2) * m_star_params.scale;
for (u16 i = 0; i < m_star_params.count; i++) {
v3f r = v3f(
myrand_range(-10000, 10000),
myrand_range(-10000, 10000),
myrand_range(-10000, 10000)
rgen.range(-10000, 10000),
rgen.range(-10000, 10000),
rgen.range(-10000, 10000)
);
core::CMatrix4<f32> a;
a.buildRotateFromTo(v3f(0, 1, 0), r);
@@ -179,6 +179,7 @@ class Sky : public scene::ISceneNode

bool m_default_tint = true;

u64 m_seed = 0;
irr_ptr<scene::SMeshBuffer> m_stars;

video::ITexture *m_sun_texture;

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