prefab loader

src/main.rs

@@ -17,8 +17,10 @@ mod logging;
 pub(crate) mod rendering;
 pub(crate) mod player;
 pub(crate) mod world;
+pub(crate) mod prefabs;
 
 use rendering::{Rederer, RenderTarget, BackgroundColor, clear_background};
+use prefabs::load_prefabs;
 
 #[derive(Unique)]
 pub(crate) struct DeltaTime(Duration);
@@ -42,12 +44,15 @@ fn main() {
   //Create a shipyard world
   let world = World::new();
 
-  //Add systems and uniques
-  world.add_unique(BackgroundColor(vec3(0.5, 0.5, 1.)));
-  world.add_unique(DeltaTime(Duration::default()));
+  //Init and load things
   world.add_unique_non_send_sync(
     Rederer::init(&event_loop)
   );
+  load_prefabs(&world);
+
+  //Add systems and uniques
+  world.add_unique(BackgroundColor(vec3(0.5, 0.5, 1.)));
+  world.add_unique(DeltaTime(Duration::default()));
   world.add_workload(update);
   world.add_workload(render);
 

src/prefabs.rs

@@ -0,0 +1,88 @@
+use shipyard::{World, NonSendSync, UniqueView, Unique};
+use strum::{EnumIter, IntoEnumIterator};
+use rayon::prelude::*;
+use glium::{texture::{SrgbTexture2dArray, RawImage2d}, backend::Facade};
+use std::{fs::File, path::PathBuf, io::BufReader};
+use crate::rendering::Rederer;
+
+trait AssetPaths {
+  fn file_name(self) -> &'static str;
+}
+
+#[derive(Clone, Copy, Debug, EnumIter)]
+#[repr(u8)]
+pub enum BlockTextures {
+  Stone         = 0,
+  Dirt          = 1,
+  GrassTop      = 2,
+  GrassSide     = 3,
+  Sand          = 4,
+  Bedrock       = 5,
+  Wood          = 6,
+  WoodTop       = 7,
+  Leaf          = 8,
+  Torch         = 9,
+  TallGrass     = 10,
+  Snow          = 11,
+  GrassSideSnow = 12,
+}
+impl AssetPaths for BlockTextures {
+  fn file_name(self) -> &'static str {
+    match self {
+      Self::Stone         => "stone.png",
+      Self::Dirt          => "dirt.png",
+      Self::GrassTop      => "grass_top.png",
+      Self::GrassSide     => "grass_side.png",
+      Self::Sand          => "sand.png",
+      Self::Bedrock       => "bedrock.png",
+      Self::Wood          => "wood.png",
+      Self::WoodTop       => "wood_top.png",
+      Self::Leaf          => "leaf.png",
+      Self::Torch         => "torch.png",
+      Self::TallGrass     => "tall_grass.png",
+      Self::Snow          => "snow.png",
+      Self::GrassSideSnow => "grass_side_snow.png",
+    }
+  }
+}
+
+fn load_texture2darray_prefab<T: AssetPaths + IntoEnumIterator, E: Facade>(directory: PathBuf, facade: &E) -> SrgbTexture2dArray {
+  //Load raw images
+  let tex_files: Vec<&'static str> = T::iter().map(|x| x.file_name()).collect();
+  let raw_images: Vec<RawImage2d<u8>> = tex_files.par_iter().map(|&file_name| {
+    log::info!("loading texture {}", file_name);
+    //Get path to the image and open the file
+    let reader = {
+      let path = directory.join(file_name);
+      BufReader::new(File::open(path).expect("Failed to open texture file"))
+    };
+    //Parse image data
+    let (image_data, dimensions) = {
+      let image =image::load(
+        reader,
+        image::ImageFormat::Png
+      ).unwrap().to_rgba8();
+      let dimensions = image.dimensions();
+      (image.into_raw(), dimensions)
+    };
+    //Create a glium RawImage
+    RawImage2d::from_raw_rgba_reversed(
+      &image_data, 
+      dimensions
+    )
+  }).collect();
+  log::info!("done loading texture files, uploading to the gpu");
+  //Upload images to the GPU
+  SrgbTexture2dArray::new(facade, raw_images)
+    .expect("Failed to upload texture array to GPU")
+}
+
+#[derive(Unique)]
+pub struct BlockTexturesPrefab(SrgbTexture2dArray);
+
+pub fn load_prefabs(world: &World) {
+  let renderer = world.borrow::<NonSendSync<UniqueView<Rederer>>>().unwrap();
+  world.add_unique_non_send_sync(BlockTexturesPrefab(
+    load_texture2darray_prefab::<BlockTextures, _>("./assets/blocks/".into(), &renderer.display)
+  ));
+}