Make Geometry indices generic, make The Crab use it

src/chunk.rs

@@ -368,8 +368,8 @@ impl Chunk {
         quads
     }
 
-    fn quads_to_geometry(quads: Vec<Quad>) -> Geometry<BlockVertex> {
-        let mut geometry: Geometry<BlockVertex> = Default::default();
+    fn quads_to_geometry(quads: Vec<Quad>) -> Geometry<BlockVertex, u16> {
+        let mut geometry: Geometry<BlockVertex, u16> = Default::default();
         for quad in quads {
             geometry.append(&mut quad.to_geometry(geometry.vertices.len() as u16));
         }
@@ -380,7 +380,7 @@ impl Chunk {
         &self,
         position: Point3<isize>,
         highlighted: Option<&(Point3<usize>, Vector3<i32>)>,
-    ) -> Geometry<BlockVertex> {
+    ) -> Geometry<BlockVertex, u16> {
         let quads: Vec<Quad> = (0..CHUNK_SIZE)
             .into_par_iter()
             .flat_map(|y| {

src/geometry.rs

@@ -1,3 +1,5 @@
+use std::marker::PhantomData;
+
 use wgpu::{
     util::{BufferInitDescriptor, DeviceExt},
     RenderPass,
@@ -7,13 +9,13 @@ use crate::{render_context::RenderContext, vertex::Vertex};
 
 /// Represents a set of triangles by its vertices and indices.
 #[derive(Default)]
-pub struct Geometry<T: Vertex> {
-    pub vertices: Vec<T>,
-    pub indices: Vec<u16>,
+pub struct Geometry<V: Vertex, I> {
+    pub vertices: Vec<V>,
+    pub indices: Vec<I>,
 }
 
-impl<T: Vertex> Geometry<T> {
-    pub fn new(vertices: Vec<T>, indices: Vec<u16>) -> Self {
+impl<T: Vertex, I> Geometry<T, I> {
+    pub fn new(vertices: Vec<T>, indices: Vec<I>) -> Self {
         Self { vertices, indices }
     }
 
@@ -29,16 +31,19 @@ impl<T: Vertex> Geometry<T> {
     }
 }
 
-pub struct GeometryBuffers {
+pub struct GeometryBuffers<I> {
     pub vertices: wgpu::Buffer,
     pub indices: wgpu::Buffer,
     pub index_count: usize,
+
+    // Phantom data to store the index type
+    _phantom: PhantomData<I>,
 }
 
-impl GeometryBuffers {
-    pub fn from_geometry<T: Vertex + bytemuck::Pod>(
+impl<I: bytemuck::Pod> GeometryBuffers<I> {
+    pub fn from_geometry<V: Vertex + bytemuck::Pod>(
         render_context: &RenderContext,
-        geometry: &Geometry<T>,
+        geometry: &Geometry<V, I>,
         usage: wgpu::BufferUsage,
     ) -> Self {
         let vertices = render_context
@@ -61,15 +66,26 @@ impl GeometryBuffers {
             vertices,
             indices,
             index_count: geometry.index_count(),
+            _phantom: PhantomData,
         }
     }
 
+    pub fn draw_indexed(&self, render_pass: &mut RenderPass) -> usize {
+        render_pass.draw_indexed(0..self.index_count as u32, 0, 0..1);
+        self.index_count / 3
+    }
+}
+
+impl GeometryBuffers<u16> {
     pub fn set_buffers<'a>(&'a self, render_pass: &mut RenderPass<'a>) {
         render_pass.set_vertex_buffer(0, self.vertices.slice(..));
         render_pass.set_index_buffer(self.indices.slice(..), wgpu::IndexFormat::Uint16);
     }
+}
 
-    pub fn draw_indexed(&self, render_pass: &mut RenderPass) {
-        render_pass.draw_indexed(0..self.index_count as u32, 0, 0..1);
+impl GeometryBuffers<u32> {
+    pub fn set_buffers<'a>(&'a self, render_pass: &mut RenderPass<'a>) {
+        render_pass.set_vertex_buffer(0, self.vertices.slice(..));
+        render_pass.set_index_buffer(self.indices.slice(..), wgpu::IndexFormat::Uint32);
     }
 }

src/npc.rs

@@ -2,17 +2,20 @@ extern crate gltf;
 extern crate wgpu;
 
 use cgmath::Vector3;
+use wgpu::BufferUsage;
 
-use crate::vertex::BlockVertex;
+use crate::{
+    geometry::{Geometry, GeometryBuffers},
+    render_context::RenderContext,
+    vertex::BlockVertex,
+};
 
 pub struct Npc {
     pub position: Vector3<f32>,
     pub scale: Vector3<f32>,
     pub rotation: Vector3<f32>,
-    pub vertices: Vec<BlockVertex>,
-    pub indices: Vec<u32>,
-    pub vertex_buffer: Option<wgpu::Buffer>,
-    pub index_buffer: Option<wgpu::Buffer>,
+    pub geometry: Geometry<BlockVertex, u32>,
+    pub geometry_buffers: Option<GeometryBuffers<u32>>,
 }
 
 impl Npc {
@@ -56,10 +59,16 @@ impl Npc {
             position,
             scale,
             rotation,
-            indices,
-            vertices,
-            vertex_buffer: None,
-            index_buffer: None,
+            geometry: Geometry::new(vertices, indices),
+            geometry_buffers: None,
         };
     }
+
+    pub fn load_geometry(&mut self, render_context: &RenderContext) {
+        self.geometry_buffers = Some(GeometryBuffers::from_geometry(
+            render_context,
+            &self.geometry,
+            BufferUsage::empty(),
+        ));
+    }
 }

src/quad.rs

@@ -52,7 +52,7 @@ impl Quad {
     pub fn to_geometry(
         &self,
         start_index: u16,
-    ) -> Geometry<BlockVertex> {
+    ) -> Geometry<BlockVertex, u16> {
         let dx = self.dx as f32;
         let dz = self.dz as f32;
         let dy = 1.0;

src/state/hud_state.rs

@@ -19,16 +19,16 @@ const UI_SCALE_Y: f32 = 0.008;
 pub struct HudState {
     texture_bind_group: wgpu::BindGroup,
     render_pipeline: wgpu::RenderPipeline,
-    hud_geometry_buffers: GeometryBuffers,
+    hud_geometry_buffers: GeometryBuffers<u16>,
 
     text_renderer: TextRenderer,
 
-    fps_geometry_buffers: GeometryBuffers,
+    fps_geometry_buffers: GeometryBuffers<u16>,
     fps_instant: Instant,
     fps_frames: u32,
     fps_elapsed: Duration,
 
-    coordinates_geometry_buffers: GeometryBuffers,
+    coordinates_geometry_buffers: GeometryBuffers<u16>,
     coordinates_last: Vector3<f32>,
     pub hotbar_cursor_position: i32,
 }

src/state/world_state.rs

@@ -212,25 +212,6 @@ impl WorldState {
             })
     }
 
-    /// TODO Move to World
-    pub fn load_npc_geometry(&mut self, render_context: &RenderContext) {
-        self.world.npc.vertex_buffer = Some(render_context.device.create_buffer_init(
-            &BufferInitDescriptor {
-                label: None,
-                contents: &bytemuck::cast_slice(&self.world.npc.vertices),
-                usage: wgpu::BufferUsage::VERTEX,
-            },
-        ));
-
-        self.world.npc.index_buffer = Some(render_context.device.create_buffer_init(
-            &BufferInitDescriptor {
-                label: None,
-                contents: &bytemuck::cast_slice(&self.world.npc.indices),
-                usage: wgpu::BufferUsage::INDEX,
-            },
-        ));
-    }
-
     pub fn toggle_wireframe(&mut self, render_context: &RenderContext) {
         self.wireframe = !self.wireframe;
         self.render_pipeline = Self::create_render_pipeline(
@@ -251,7 +232,8 @@ impl WorldState {
 
         let (time, time_buffer, time_layout, time_bind_group) = Self::create_time(render_context);
 
-        let world = World::new();
+        let mut world = World::new();
+        world.npc.load_geometry(render_context);
 
         let shader = render_context.device.create_shader_module(
             &(wgpu::ShaderModuleDescriptor {
@@ -277,7 +259,7 @@ impl WorldState {
             Self::create_render_pipeline(&render_context, &shader, &render_pipeline_layout, false);
         let depth_texture = Texture::create_depth_texture(render_context, "depth_texture");
 
-        let mut world_state = Self {
+        Self {
             render_pipeline,
             view,
             view_buffer,
@@ -304,11 +286,7 @@ impl WorldState {
             left_pressed: false,
             right_pressed: false,
             creative: true,
-        };
-
-        world_state.load_npc_geometry(render_context);
-
-        world_state
+        }
     }
 
     pub fn render(&self, frame: &SwapChainTexture, render_encoder: &mut CommandEncoder) -> usize {

src/text_renderer.rs

@@ -124,7 +124,12 @@ impl TextRenderer {
         (vertices, indices)
     }
 
-    pub fn string_geometry(&self, mut x: f32, mut y: f32, string: &str) -> Geometry<HudVertex> {
+    pub fn string_geometry(
+        &self,
+        mut x: f32,
+        mut y: f32,
+        string: &str,
+    ) -> Geometry<HudVertex, u16> {
         let mut vertices = Vec::new();
         let mut indices = Vec::new();
 
@@ -153,7 +158,7 @@ impl TextRenderer {
         x: f32,
         y: f32,
         string: &str,
-    ) -> GeometryBuffers {
+    ) -> GeometryBuffers<u16> {
         let geometry = self.string_geometry(x, y, string);
         GeometryBuffers::from_geometry(render_context, &geometry, wgpu::BufferUsage::empty())
     }

src/world.rs

@@ -19,7 +19,7 @@ pub struct World {
     pub chunk_save_queue: VecDeque<Point3<isize>>,
     pub chunk_load_queue: VecDeque<Point3<isize>>,
     pub chunk_generate_queue: VecDeque<Point3<isize>>,
-    pub chunk_buffers: AHashMap<Point3<isize>, GeometryBuffers>,
+    pub chunk_buffers: AHashMap<Point3<isize>, GeometryBuffers<u16>>,
 
     pub highlighted: Option<(Point3<isize>, Vector3<i32>)>,
 }
@@ -117,15 +117,13 @@ impl World {
             }
 
             buffers.set_buffers(render_pass);
-            buffers.draw_indexed(render_pass);
-            triangle_count += buffers.index_count / 3;
+            triangle_count += buffers.draw_indexed(render_pass);
         }
 
         {
             let buffers = self.npc.geometry_buffers.as_ref().unwrap();
             buffers.set_buffers(render_pass);
-            render_pass.draw_indexed(0..self.npc.indices.len() as u32, 0, 0..1);
-            triangle_count += self.npc.indices.len() / 3;
+            triangle_count += buffers.draw_indexed(render_pass);
         }
 
         triangle_count