Don't force loaded model indicies to U32

lyra-resource/src/loader/model.rs

@@ -2,7 +2,7 @@ use std::sync::Arc;
 
 use base64::Engine;
 
-use crate::{ResourceLoader, LoaderError, Mesh, Model, MeshVertexAttribute, VertexAttributeData, Resource, Material, ResHandle};
+use crate::{ResourceLoader, LoaderError, Mesh, Model, MeshVertexAttribute, VertexAttributeData, Resource, Material, MeshIndices};
 
 use tracing::debug;
 
@@ -67,10 +67,11 @@ impl ModelLoader {
 
                 // read the indices
                 if let Some(indices) = reader.read_indices() {
-                    let indices: Vec<u32> = match indices {
-                        gltf::mesh::util::ReadIndices::U8(i) => i.map(|i| i as u32).collect(),
-                        gltf::mesh::util::ReadIndices::U16(i) => i.map(|i| i as u32).collect(),
-                        gltf::mesh::util::ReadIndices::U32(i) => i.collect(),
+                    let indices: MeshIndices = match indices {
+                        // wpgu doesn't support u8 indices, so those must be converted to u16
+                        gltf::mesh::util::ReadIndices::U8(i) => MeshIndices::U16(i.map(|i| i as u16).collect()),
+                        gltf::mesh::util::ReadIndices::U16(i) => MeshIndices::U16(i.collect()),
+                        gltf::mesh::util::ReadIndices::U32(i) => MeshIndices::U32(i.collect()),
                     };
 
                     new_mesh.indices = Some(indices);

lyra-resource/src/model.rs

@@ -1,6 +1,32 @@
 use std::collections::HashMap;
 
-use crate::{Material, ResHandle};
+use crate::Material;
+
+#[repr(C)]
+#[derive(Clone, Debug, PartialEq)]
+pub enum MeshIndices {
+    //U8(Vec<u8>),
+    U16(Vec<u16>),
+    U32(Vec<u32>),
+}
+
+/* impl From<Vec<u8>> for MeshIndices {
+    fn from(value: Vec<u8>) -> Self {
+        MeshIndices::U8(value)
+    }
+} */
+
+impl From<Vec<u16>> for MeshIndices {
+    fn from(value: Vec<u16>) -> Self {
+        MeshIndices::U16(value)
+    }
+}
+
+impl From<Vec<u32>> for MeshIndices {
+    fn from(value: Vec<u32>) -> Self {
+        MeshIndices::U32(value)
+    }
+}
 
 #[repr(C)]
 #[derive(Clone, Debug, PartialEq)]
@@ -45,7 +71,7 @@ pub enum MeshVertexAttribute {
 #[derive(Clone, Default, edict::Component)]
 pub struct Mesh {
     pub attributes: HashMap<MeshVertexAttribute, VertexAttributeData>,
-    pub indices: Option<Vec<u32>>,
+    pub indices: Option<MeshIndices>,
     material: Option<Material>,
 }
 

src/render/render_pipeline.rs

@@ -1,8 +1,8 @@
-use std::{ops::Range, cell::Ref};
+use std::ops::Range;
 
 use wgpu::{PipelineLayout, RenderPipeline, RenderPass, VertexBufferLayout, BindGroupLayout};
 
-use super::{render_job::RenderJob, vertex::Vertex, desc_buf_lay::DescVertexBufferLayout, texture::RenderTexture};
+use super::{render_job::RenderJob, texture::RenderTexture};
 
 pub struct FullRenderPipeline {
     layout: PipelineLayout,

src/render/renderer.rs

@@ -36,7 +36,7 @@ pub trait Renderer {
 
 struct RenderBufferStorage {
     buffer_vertex: BufferStorage,
-    buffer_indices: Option<BufferStorage>,
+    buffer_indices: Option<(wgpu::IndexFormat, BufferStorage)>,
 
     render_texture: Option<RenderTexture>,
     texture_bindgroup: Option<BindGroup>,
@@ -404,14 +404,6 @@ impl BasicRenderer {
         s
     }
 
-    fn find_next_multiple(n: u32, mul: u32) -> u32 {
-        if n % mul == 0 {
-            n
-        } else {
-            n + (mul - n % mul)
-        }
-    }
-
     fn update_mesh_buffers(&mut self, entity: EntityId, mesh: &Mesh) {
         if let Some(buffers) = self.buffer_storage.get_mut(&entity) {
             // check if the buffer sizes dont match. If they dont, completely remake the buffers
@@ -438,16 +430,19 @@ impl BasicRenderer {
 
             // update the indices if they're given
             if let Some(index_buffer) = buffers.buffer_indices.as_ref() {
-                let index_buffer = index_buffer.buffer();
-                let indices = mesh.indices.as_ref().unwrap().as_slice();
-                let (_, indices, _) = bytemuck::pod_align_to::<u32, u32>(indices); // TODO: Don't force indicies into u32
+                let aligned_indices = match mesh.indices.as_ref().unwrap() {
+                    // U16 indices need to be aligned to u32, for wpgu, which are 4-bytes in size.
+                    lyra_resource::MeshIndices::U16(v) => bytemuck::pod_align_to::<u16, u32>(v).1,
+                    lyra_resource::MeshIndices::U32(v) => bytemuck::pod_align_to::<u32, u32>(v).1,
+                };
                 
-                self.queue.write_buffer(index_buffer, 0, bytemuck::cast_slice(&indices));
+                let index_buffer = index_buffer.1.buffer();
+                self.queue.write_buffer(index_buffer, 0, bytemuck::cast_slice(&aligned_indices));
             }
         }
     }
 
-    fn create_vertex_index_buffers(&mut self, mesh: &Mesh) -> (BufferStorage, Option<BufferStorage>) {
+    fn create_vertex_index_buffers(&mut self, mesh: &Mesh) -> (BufferStorage, Option<(wgpu::IndexFormat, BufferStorage)>) {
         let vertices = mesh.position().unwrap();
         let vertex_buffer = self.device.create_buffer_init(
             &wgpu::util::BufferInitDescriptor {
@@ -458,26 +453,31 @@ impl BasicRenderer {
         );
         let vertex_buffer = BufferStorage::new(vertex_buffer, 0, vertices.len());
 
-        let buffer_indices = match mesh.indices.as_ref() {
+        let indices = match mesh.indices.as_ref() {
             Some(indices) => {
+                let (idx_type, len, contents) = match indices {
+                    lyra_resource::MeshIndices::U16(v) => (wgpu::IndexFormat::Uint16, v.len(), bytemuck::cast_slice(&v)),
+                    lyra_resource::MeshIndices::U32(v) => (wgpu::IndexFormat::Uint32, v.len(), bytemuck::cast_slice(&v)),
+                };
+
                 let index_buffer = self.device.create_buffer_init(
                     &wgpu::util::BufferInitDescriptor {
                         label: Some("Index Buffer"),
-                        contents: bytemuck::cast_slice(&indices),
+                        contents,
                         usage: wgpu::BufferUsages::INDEX | wgpu::BufferUsages:: COPY_DST,
                     }
                 );
 
-                let buffer_indices = BufferStorage::new(index_buffer, 0, indices.len());
+                let buffer_indices = BufferStorage::new(index_buffer, 0, len);
 
-                Some(buffer_indices)
+                Some((idx_type, buffer_indices))
             },
             None => {
                 None
             }
         };
 
-        ( vertex_buffer, buffer_indices )
+        ( vertex_buffer, indices )
     }
 
     fn create_mesh_buffers(&mut self, mesh: &Mesh, transform_indices: TransformBufferIndices) -> RenderBufferStorage {
@@ -676,11 +676,11 @@ impl Renderer for BasicRenderer {
                     render_pass.set_bind_group(2, &self.camera_bind_group, &[]);
         
                     // if this mesh uses indices, use them to draw the mesh
-                    if let Some(indices) = buffers.buffer_indices.as_ref() {
+                    if let Some((idx_type, indices)) = buffers.buffer_indices.as_ref() {
                         let indices_len = indices.count() as u32;
         
                         render_pass.set_vertex_buffer(buffers.buffer_vertex.slot(), buffers.buffer_vertex.buffer().slice(..));
-                        render_pass.set_index_buffer(indices.buffer().slice(..), wgpu::IndexFormat::Uint32);
+                        render_pass.set_index_buffer(indices.buffer().slice(..), idx_type.clone());
                         render_pass.draw_indexed(0..indices_len, 0, 0..1);
                     } else {
                         let vertices = mesh.position().unwrap();