first chunk implementation

Cargo.lock

@@ -819,6 +819,12 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "ppv-lite86"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
+
 [[package]]
 name = "pretty_env_logger"
 version = "0.5.0"
@@ -865,6 +871,36 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+dependencies = [
+ "getrandom",
+]
+
 [[package]]
 name = "raw-window-handle"
 version = "0.6.0"
@@ -1181,6 +1217,7 @@ dependencies = [
  "log",
  "png",
  "pretty_env_logger",
+ "rand",
  "serde",
  "thiserror",
  "tobj",

Cargo.toml

@@ -16,3 +16,4 @@ tobj = { version = "3", features = ["log"] }
 vulkanalia = { version = "=0.23.0", features = ["libloading", "provisional", "window"] }
 winit = "0.29"
 serde = { version = "1.0", features = ["derive"] }
+rand = "0.8"

src/scene.rs

@@ -3,11 +3,18 @@ use anyhow::Result;
 
 use cgmath::{vec2, vec3};
 
+use std::collections::HashMap;
+
 use crate::app_data::AppData;
 use crate::buffer;
 use crate::vertex;
 use crate::primitives::cube::Cube;
 
+extern crate rand;
+use rand::Rng;
+
+const CHUNK_SIZE: usize = 100;
+
 #[derive(Clone, Debug, Default)]
 pub struct Scene {
     pub vertices: Vec<vertex::Vertex>,
@@ -22,20 +29,35 @@ pub struct Scene {
 
 impl Scene {
     pub unsafe fn prepare_data(&mut self, instance: &vulkanalia::Instance, device: &vulkanalia::Device, data: &AppData) -> Result<()> {
+        let mut rng = rand::thread_rng();
+        let grid_size = CHUNK_SIZE as i32;
+
+        // todo store the chunks somewhere (or only use them as intermediary for neighbouthood calculation idc)
+        let mut chunks = vec![Chunk::create()?];
 
-        let grid_size = 1000;
         //todo use the 14 vertice box method. Not using geometry shaders seems to be faster... make this a setting?
         // have cube elements with a method asking for vertices, while giving a primitive type -> method for preferred primitive type as well as one collecting all primitives
-        for x_index in -grid_size..grid_size {
-            for y_index in -grid_size..grid_size {
-                let index = self.vertices.len();
+        for x_index in 0..grid_size {
+            for y_index in 0..grid_size {
+                let shade = (rng.gen_range(0..25) as f32) / 100.0;
                 let cube = Cube {
                     pos: vec3(x_index as f32, y_index as f32, 0.0),
-                    color: vec3(0.0, 1.0, 0.0),
+                    color: vec3(shade, 1.0, shade),
                     tex_coord: vec2(0.0, 0.0)
                 };
+                chunks[0].set_cube(cube);
+            }
+        }
 
-                cube.draw(&data.topology, index, self);
+        let chunk  = &chunks[0];
+        let chunk_iter = ChunkIter::create(chunk)?;
+        for item in  chunk_iter {
+            let index = self.vertices.len();
+            match item {
+                Some(cube) => {
+                    cube.draw(&data.topology, index, self);
+                }
+                None => {}
             }
         }
         
@@ -54,3 +76,81 @@ impl Scene {
         device.free_memory(self.vertex_buffer_memory, None);
     }
 }
+
+#[derive(Clone, Debug)]
+struct Chunk {
+    //todo change to hashmap?
+    blocks: HashMap<cgmath::Vector3<u32>, Cube>,
+}
+
+impl Chunk {
+    pub fn create() -> Result<Self> {
+        let mut map = HashMap::new();
+        Ok(Self {
+            blocks: map
+        })
+    }
+
+    pub fn set_cube(&mut self, cube: Cube) {
+        let x = cube.pos.x as usize;
+        let y = cube.pos.y as usize;
+        let z = cube.pos.z as usize;
+        assert!(x < CHUNK_SIZE, "x value out of range!");
+        assert!(y < CHUNK_SIZE, "y value out of range!");
+        assert!(z < CHUNK_SIZE, "z value out of range!");
+        self.blocks.insert(vec3(x as u32, y as u32, z as u32), cube);
+    }
+
+    pub fn clear_cube(&mut self, x: usize, y: usize, z: usize) {
+        assert!(x < CHUNK_SIZE, "x value out of range!");
+        assert!(y < CHUNK_SIZE, "y value out of range!");
+        assert!(z < CHUNK_SIZE, "z value out of range!");
+        self.blocks.remove(&vec3(x as u32, y as u32, z as u32));
+    }
+
+}
+
+struct ChunkIter<'a> {
+    iter_x: usize,
+    iter_y: usize,
+    iter_z: usize,
+    chunk: &'a Chunk
+}
+
+impl<'a> ChunkIter<'a> {
+    pub fn create(chunk: &'a Chunk) -> Result<Self> {
+
+        Ok(Self {
+            iter_x: 0,
+            iter_y: 0,
+            iter_z: 0,
+            chunk
+        })
+    }
+}
+
+impl<'a> Iterator for ChunkIter<'a> {
+    type Item = Option<&'a Cube>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.iter_x < CHUNK_SIZE && self.iter_y < CHUNK_SIZE && self.iter_z < CHUNK_SIZE {
+            let result = self.chunk.blocks.get(&vec3(self.iter_x as u32, self.iter_y as u32, self.iter_z as u32));
+
+            self.iter_x += 1;
+            if self.iter_x >= CHUNK_SIZE {
+                self.iter_x = 0;
+                self.iter_y += 1;
+            }
+            if self.iter_y >= CHUNK_SIZE {
+                self.iter_y = 0;
+                self.iter_z += 1;
+            }
+            return Some(result.clone())
+        }
+        self.iter_x = 0;
+        self.iter_y = 0;
+        self.iter_z = 0;
+        None
+    }
+}
+