Fix RNG transmutation

enkou-shaders/src/chaos_game.rs

@@ -110,7 +110,7 @@ impl<'a, R: Rng> Iterator for ChaosGame<'a, R> {
 /// Shader entry point for running the chaos game to produce new IFS coordinates
 pub mod entry {
     use crate::chaos_game::ChaosGame;
-    use crate::rng::xoshiro_from_state;
+    use crate::rng::xoshiro256starstar_from_seed;
     use crate::transform::Transform;
     use crate::variation::Variation;
     use glam::Vec2;
@@ -121,15 +121,16 @@ pub mod entry {
     #[spirv(compute(entry_point_name = "main_chaos_game", threads(1)))]
     pub fn main_chaos_game(
         #[spirv(spec_constant(id = 1, default = 20))] iteration_discard: u32,
-        #[spirv(storage_buffer, descriptor_set = 0, binding = 0)] _rng_seed: &[u8],
+        #[spirv(storage_buffer, descriptor_set = 0, binding = 0)] rng_seed: &[u8],
         #[spirv(storage_buffer, descriptor_set = 0, binding = 1)] transforms: &[Transform],
         #[spirv(storage_buffer, descriptor_set = 0, binding = 2)] weights: &[f32],
         #[spirv(storage_buffer, descriptor_set = 0, binding = 3)] variations: &[Variation],
         #[spirv(storage_buffer, descriptor_set = 1, binding = 0)] output: &mut [Vec2],
     ) {
-        let rng_seed_actual = [0u8; 32];
+        let mut rng_seed_actual = [0u8; 32];
+        (0..32).for_each(|i| rng_seed_actual[i] = rng_seed[i]);
 
-        let mut rng = xoshiro_from_state(rng_seed_actual);
+        let mut rng = xoshiro256starstar_from_seed(rng_seed_actual);
         let mut chaos_game = ChaosGame::new(&mut rng, transforms, weights, variations);
 
         for _ in 0..iteration_discard {