forked from 1b-agent/opencadstudio-upstream
98 lines
3.2 KiB
Rust
98 lines
3.2 KiB
Rust
// Mesh GPU buffers — TriangleList rendering for solid objects.
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//
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// Vertex layout (40 bytes):
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// position [f32; 3] offset 0 12 B
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// normal [f32; 3] offset 12 12 B
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// color [f32; 4] offset 24 16 B
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// ------
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// 40 B / vertex
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use crate::scene::mesh_model::MeshModel;
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use iced::wgpu;
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use iced::wgpu::util::DeviceExt;
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// ── Vertex layout ─────────────────────────────────────────────────────────
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#[repr(C)]
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#[derive(Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
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pub struct MeshVertex {
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pub position: [f32; 3],
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pub normal: [f32; 3],
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pub color: [f32; 4],
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}
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impl MeshVertex {
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pub fn layout<'a>() -> wgpu::VertexBufferLayout<'a> {
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wgpu::VertexBufferLayout {
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array_stride: std::mem::size_of::<MeshVertex>() as u64,
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step_mode: wgpu::VertexStepMode::Vertex,
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attributes: &[
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wgpu::VertexAttribute {
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offset: 0,
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shader_location: 0,
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format: wgpu::VertexFormat::Float32x3,
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},
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wgpu::VertexAttribute {
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offset: 12,
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shader_location: 1,
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format: wgpu::VertexFormat::Float32x3,
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},
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wgpu::VertexAttribute {
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offset: 24,
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shader_location: 2,
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format: wgpu::VertexFormat::Float32x4,
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},
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],
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}
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}
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}
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// ── GPU handle ────────────────────────────────────────────────────────────
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pub struct MeshGpu {
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pub vertex_buffer: wgpu::Buffer,
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pub index_buffer: wgpu::Buffer,
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pub index_count: u32,
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}
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impl MeshGpu {
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pub fn new(device: &wgpu::Device, mesh: &MeshModel) -> Self {
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let has_normals = mesh.normals.len() == mesh.verts.len();
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let vertices: Vec<MeshVertex> = mesh
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.verts
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.iter()
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.enumerate()
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.map(|(i, &pos)| {
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let normal = if has_normals {
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mesh.normals[i]
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} else {
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[0.0, 1.0, 0.0]
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};
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MeshVertex {
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position: pos,
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normal,
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color: mesh.color,
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}
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})
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.collect();
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let vertex_buffer = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
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label: Some(&format!("mesh.vbuf.{}", mesh.name)),
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contents: bytemuck::cast_slice(&vertices),
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usage: wgpu::BufferUsages::VERTEX,
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});
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let index_buffer = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
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label: Some(&format!("mesh.ibuf.{}", mesh.name)),
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contents: bytemuck::cast_slice(&mesh.indices),
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usage: wgpu::BufferUsages::INDEX,
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});
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Self {
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vertex_buffer,
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index_buffer,
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index_count: mesh.indices.len() as u32,
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}
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}
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}
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