Update entity model buffers when changed

src/main.rs

@@ -134,14 +134,19 @@ async fn main() {
 
         for transform in world.query_mut::<(&mut TransformComponent,)>().iter_mut() {
             let t = &mut transform.transform;
-            debug!("Translation: {}", t.translation);
+            //debug!("Translation: {}", t.translation);
 
             /* t.translation += glam::Vec3::new(0.0, 0.001, 0.0);
             t.translation.x *= -1.0; */
             t.translation.x += dir_x;
             t.translation.y += dir_y;
         }
-        debug!("end");
+
+        /* for mesh in world.query_mut::<(&mut MeshComponent,)>().iter_mut() {
+            for vertex in mesh.mesh.vertices.iter_mut() {
+                vertex.position[0] += 0.0001;
+            }
+        } */
 
         Ok(())
     };

src/render/render_buffer.rs

@@ -21,12 +21,12 @@ impl RenderBuffer {
 pub struct BufferStorage {
     buffer: wgpu::Buffer,
     slot: u32,
-    count: Option<u32>
+    count: usize
 }
 
 #[allow(dead_code)]
 impl BufferStorage {
-    pub fn new(buffer: wgpu::Buffer, slot: u32, count: Option<u32>) -> Self {
+    pub fn new(buffer: wgpu::Buffer, slot: u32, count: usize) -> Self {
         Self {
             buffer,
             slot,
@@ -46,7 +46,7 @@ impl BufferStorage {
         self.slot
     }
 
-    pub fn count(&self) -> Option<u32> {
+    pub fn count(&self) -> usize {
         self.count
     }
 }

src/render/renderer.rs

@@ -10,6 +10,7 @@ use async_std::sync::Mutex;
 use async_trait::async_trait;
 
 use atomicell::{AtomicCell, RefMut};
+use edict::query::EpochOf;
 use edict::{EntityId, Entities};
 use glam::Mat4;
 use tracing::{debug, warn};
@@ -26,6 +27,7 @@ use crate::resources;
 use super::camera::RenderCamera;
 use super::desc_buf_lay::DescVertexBufferLayout;
 use super::texture::RenderTexture;
+use super::vertex::Vertex;
 use super::{render_pipeline::FullRenderPipeline, vertex::{VERTICES}, render_buffer::BufferStorage, render_job::RenderJob, mesh::Mesh};
 
 pub trait Renderer {
@@ -374,16 +376,58 @@ impl BasicRenderer {
         }
     }
 
-    fn create_model_buffers(&mut self, model_2d: &MeshComponent, transform_indices: TransformBufferIndices) -> RenderBufferStorage {
-        let mesh = &model_2d.mesh;
+    fn find_next_multiple(n: u32, mul: u32) -> u32 {
+        if n % mul == 0 {
+            n
+        } else {
+            n + (mul - n % mul)
+        }
+    }
 
+    // TODO: minimize how often model buffers are updated by checking if they changed
+    fn update_model_buffers(&mut self, entity: EntityId, model: &MeshComponent) {
+        if let Some(buffers) = self.buffer_storage.get_mut(&entity) {
+            // check if the buffer sizes dont match. If they dont, completely remake the buffers
+            let vertices = &model.mesh.vertices;
+            if buffers.buffer_vertex.count() != vertices.len() {
+                drop(buffers);
+                let (vert, idx) = self.create_vertex_index_buffers(&model.mesh);
+
+                // have to re-get buffers because of borrow checker
+                let buffers = self.buffer_storage.get_mut(&entity).unwrap();
+                buffers.buffer_indices = idx;
+                buffers.buffer_vertex = vert;
+
+                return;
+            }
+
+            // update vertices
+            let vertex_buffer = buffers.buffer_vertex.buffer();
+            let vertices = vertices.as_slice();
+            // align the vertices to 4 bytes (u32 is 4 bytes, which is wgpu::COPY_BUFFER_ALIGNMENT)
+            let (_, vertices, _) = bytemuck::pod_align_to::<Vertex, u32>(vertices);
+            self.queue.write_buffer(&vertex_buffer, 0, bytemuck::cast_slice(&vertices));
+
+            // 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 = model.mesh.indices.as_ref().unwrap().as_slice();
+                let (_, indices, _) = bytemuck::pod_align_to::<u16, u32>(indices);
+
+                self.queue.write_buffer(index_buffer, 0, bytemuck::cast_slice(&indices));
+            }
+        }
+    }
+
+    fn create_vertex_index_buffers(&mut self, mesh: &Mesh) -> (BufferStorage, Option<BufferStorage>) {
         let vertex_buffer = self.device.create_buffer_init(
             &wgpu::util::BufferInitDescriptor {
                 label: Some("Vertex Buffer"),
                 contents: bytemuck::cast_slice(mesh.vertices.as_slice()),
-                usage: wgpu::BufferUsages::VERTEX,
+                usage: wgpu::BufferUsages::VERTEX | wgpu::BufferUsages:: COPY_DST, 
             }
         );
+        let vertex_buffer = BufferStorage::new(vertex_buffer, 0, mesh.vertices.len());
 
         let buffer_indices = match mesh.indices.as_ref() {
             Some(indices) => {
@@ -391,11 +435,11 @@ impl BasicRenderer {
                     &wgpu::util::BufferInitDescriptor {
                         label: Some("Index Buffer"),
                         contents: bytemuck::cast_slice(&indices),
-                        usage: wgpu::BufferUsages::INDEX,
+                        usage: wgpu::BufferUsages::INDEX | wgpu::BufferUsages:: COPY_DST,
                     }
                 );
 
-                let buffer_indices = BufferStorage::new(index_buffer, 0, Some(indices.len() as u32));
+                let buffer_indices = BufferStorage::new(index_buffer, 0, indices.len());
 
                 Some(buffer_indices)
             },
@@ -404,7 +448,15 @@ impl BasicRenderer {
             }
         };
 
-        let texture_img = &model_2d.material.texture;
+        ( vertex_buffer, buffer_indices )
+    }
+
+    fn create_model_buffers(&mut self, model: &MeshComponent, transform_indices: TransformBufferIndices) -> RenderBufferStorage {
+        let mesh = &model.mesh;
+
+        let (vertex_buffer, buffer_indices) = self.create_vertex_index_buffers(mesh);
+
+        let texture_img = &model.material.texture;
         let diffuse_texture = RenderTexture::from_image(&self.device, &self.queue, &texture_img.img, 0, Some("happy-tree.png")).unwrap();
 
         let texture_bind_group_layout =
@@ -450,7 +502,7 @@ impl BasicRenderer {
         );
 
         RenderBufferStorage {
-            buffer_vertex: BufferStorage::new(vertex_buffer, 0, None),
+            buffer_vertex: vertex_buffer,
             buffer_indices,
             render_texture: None,
             texture_layout: None,
@@ -498,13 +550,15 @@ impl BasicRenderer {
 
 impl Renderer for BasicRenderer {
     fn prepare(&mut self, main_world: &mut edict::World) {
+        let last_epoch = main_world.epoch();
         // render_limits.max_uniform_buffer_binding_size
-        for (entity, model, transform) in main_world.query::<(Entities, &MeshComponent, &TransformComponent)>().iter() {
+        for (entity, model, model_epoch, transform) in main_world.query::<(Entities, &MeshComponent, EpochOf<MeshComponent>, &TransformComponent)>().iter() {
             // Create the render job and push it to the queue
             let job = RenderJob::new(model.mesh.clone(), model.material.clone(), entity, transform.transform, None);
             self.render_jobs.push_back(job);
 
-            if self.buffer_storage.get(&entity).is_none() { // TODO: Delete dead entites from buffer_storage
+            // TODO: Delete dead entites from buffer_storage
+            if self.buffer_storage.get(&entity).is_none() {
                 // check if the transform buffers need to be expanded
                 if self.transform_buffers.should_expand() {
                     self.expand_transform_buffers();
@@ -522,7 +576,10 @@ impl Renderer for BasicRenderer {
                 self.transform_buffers.update_entity(&self.queue, &self.render_limits,
                     entity, transform.transform.calculate_mat4());
 
-                // TODO: Update model buffers in storage
+                // if the model was updated, update its buffers
+                if model_epoch == last_epoch {
+                    self.update_model_buffers(entity, model);
+                }
             }
         }
 
@@ -587,7 +644,7 @@ impl Renderer for BasicRenderer {
         
                     // if this mesh uses indices, use them to draw the mesh
                     if let Some(indices) = buffers.buffer_indices.as_ref() {
-                        let indices_len = indices.count().unwrap(); // index buffers will have count, if not thats a bug
+                        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::Uint16);