ajout mesh.rs

lib/mesh.rs

@@ -0,0 +1,36 @@
+use crate::vertex::Vertex;
+use wgpu::util::DeviceExt;
+
+pub struct Mesh {
+    pub vertex_buffer: wgpu::Buffer,
+    pub index_buffer: Option<wgpu::Buffer>,
+    pub num_vertices: u32,
+    pub num_indices: u32,
+}
+
+impl Mesh {
+    pub fn new(device: &wgpu::Device, vertices: &[Vertex], indices: Option<&[u16]>) -> Self {
+        let vertex_buffer = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+            label: Some("Mesh Vertex Buffer"),
+            contents: bytemuck::cast_slice(vertices),
+            usage: wgpu::BufferUsages::VERTEX,
+        });
+
+        let (index_buffer, num_indices) = if let Some(data) = indices {
+            let buffer = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+                label: Some("Mesh Index Buffer"),
+                usage: wgpu::BufferUsages::INDEX,
+                contents: bytemuck::cast_slice(data),
+            });
+            (Some(buffer), data.len() as u32)
+        } else {
+            (None, 0)
+        };
+        Self {
+            vertex_buffer,
+            index_buffer,
+            num_vertices: vertices.len() as u32,
+            num_indices,
+        }
+    }
+}