From 4a982799a0a58f800d116c5bdfbfb4f53da48ccf Mon Sep 17 00:00:00 2001
From: gents83 <gents83@gmail.com>
Date: Sat, 1 Feb 2025 13:25:02 +0100
Subject: [PATCH] Removing rand crate dependency

---
 .github/workflows/rust.yml |  4 ++--
 crates/Cargo.toml          |  2 --
 crates/math/Cargo.toml     |  4 +---
 crates/math/src/random.rs  | 18 +++++++++++++++---
 4 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 254c0b4a..b13a997b 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -13,8 +13,8 @@ on:
 env:
   CARGO_TERM_COLOR: always
   CARGO_TARGET_DIR: ./crates/target
-  RUSTFLAGS: '--cfg getrandom_backend="wasm_js" --cfg=web_sys_unstable_apis' # required for wasmbindgen to work
-
+  RUSTFLAGS: '--cfg=web_sys_unstable_apis' # required for webgpu
+  
 jobs:
   check:
     name: "Build on OS: ${{ matrix.os }}"
diff --git a/crates/Cargo.toml b/crates/Cargo.toml
index 67a7ee40..1c284675 100644
--- a/crates/Cargo.toml
+++ b/crates/Cargo.toml
@@ -45,8 +45,6 @@ downcast-rs = { git = "https://github.com/marcianx/downcast-rs" }
 egui = { git = "https://github.com/emilk/egui" }
 image = { git = "https://github.com/image-rs/image", version = "0.25.0", default-features = false, features = [ "default-formats"] }
 pyo3 = { git = "https://github.com/PyO3/pyo3", features = ["macros", "extension-module", "auto-initialize", "abi3-py310", "generate-import-lib"] }
-getrandom = { version = "0.3", features = ["wasm_js"] }
-rand = { git = "https://github.com/rust-random/rand", features = ["std"] }
 serde_json = { git = "https://github.com/serde-rs/json"}
 flexbuffers = { version = "2.0.0"}
 ttf-parser = { git = "https://github.com/RazrFalcon/ttf-parser" }
diff --git a/crates/math/Cargo.toml b/crates/math/Cargo.toml
index d76dd86b..c0c4caf1 100644
--- a/crates/math/Cargo.toml
+++ b/crates/math/Cargo.toml
@@ -12,6 +12,4 @@ license.workspace = true
 crate-type = ["lib"]
 
 [dependencies]
-cgmath = { workspace = true }
-getrandom = { workspace = true, optional = true}
-rand = { workspace = true }
\ No newline at end of file
+cgmath = { workspace = true }
\ No newline at end of file
diff --git a/crates/math/src/random.rs b/crates/math/src/random.rs
index 84c4233e..044a5297 100644
--- a/crates/math/src/random.rs
+++ b/crates/math/src/random.rs
@@ -1,8 +1,20 @@
-use rand::Rng;
+use std::time::{SystemTime, UNIX_EPOCH};
 
 pub fn get_random_f32(min: f32, max: f32) -> f32 {
-    rand::rng().random_range(min..max)
+    let now = SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .expect("Time went backwards");
+
+    let nanos = now.as_nanos() as u64; // Get nanoseconds as u64
+    let normalized = (nanos % 1_000_000_000) as f32 / 1_000_000_000.0; // Normalize to [0,1)
+
+    min + normalized * (max - min) // Scale to range [min, max]
 }
 pub fn get_random_u32(min: u32, max: u32) -> u32 {
-    rand::rng().random_range(min..max)
+    let now = SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .expect("Time went backwards");
+
+    let nanos = now.as_nanos() as u64; // Get nanoseconds as u64
+    (nanos % ((max - min + 1) as u64)) as u32 + min
 }