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Give the starfield a slight twist

master
Felipe Manga 2024-01-15 11:17:56 +00:00
parent d202e4c76e
commit ca9ae0f7fe
1 changed files with 11 additions and 21 deletions
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32
apps/warpdrive/app.js
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@ -232,40 +232,30 @@ void v_project(Point* p){
} }
void stars() { void stars() {
f += 5; f += 7;
_rngState = 1013904223; _rngState = 1013904223;
// rng(); rng(); rng();
for (int i = 0; i < 100; ++i) { for (int i = 0; i < 100; ++i) {
int s = rng(); int a = rng() + ((i & 1 ? f : -f) << 7);
int a = rng();
int ca = cos(a); int ca = cos(a);
int sa = sin(a); int sa = sin(a);
int r = ((rng() & 0xFF) + 0xFF) << 9; int r = ((rng() & 0xFF) + 0xFF);
position.x = ca << 9; position.x = r*ca;
position.y = sa << 9; position.y = r*sa;
position.x = ((signed char)(s & 0xFF)) << 9; position.z = 0xFF - ((rng() + f) & 0xFF);
s = rng();
position.y = ((signed char)(s & 0xFF)) << 9;
s = rng();
position.z = 0xFF - ((s + f) & 0xFF);
position.z <<= 12; position.z <<= 12;
position.z -= 100 << 8; position.z -= 100 << 8;
int light = position.z < (800 << 8); int light = position.z < (800 << 8);
int dark = position.z > ((800 + 500) << 8); int dark = position.z > ((800 + 500) << 8);
scale = position; scale = position;
scale.z += 30 << 10;
v_project(&position); v_project(&position);
int s = 32 * position.z >> 8;
if (!s)
continue;
scale.z += 30 << 10;
v_project(&scale); v_project(&scale);
s = (((s & 3) + 3) * position.z + 256) >> 7;
if (s < 1) s = 1;
if (s > 10) s = 10;
int rx = s*sa >> 8; int rx = s*sa >> 8;
int ry = s*ca >> 8; int ry = s*ca >> 8;