irrlicht
56d92cdb46
engine/map.rs + render/brush.rs raus, Welt kommt komplett aus .glb. Spawn via Empty mit role=spawn statt info_player_start; testscene.glb (Boden, Wände, Spawn) ersetzt test.map. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
288 lines
11 KiB
Rust
288 lines
11 KiB
Rust
//! Szenen-Pass: zeichnet die 3D-Welt ins interne Target.
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//!
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//! Geometrie + Texturen kommen vom Aufrufer (Blender-Modelle via
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//! render::props; Bilder aus engine::tga). Pro Textur eine Bind-Group +
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//! ein Draw-Batch (Material-Batching „pro Textur ein Draw" wie im Plan).
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//! Die Shader (scene.wgsl) sind die echten PS1-Shader.
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use wgpu::util::DeviceExt;
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use crate::engine::tga::Image;
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use crate::render::math::Mat4;
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#[repr(C)]
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#[derive(Clone, Copy, bytemuck::Pod, bytemuck::Zeroable)]
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pub(crate) struct Vertex {
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pub(crate) pos: [f32; 3],
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pub(crate) uv: [f32; 2],
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}
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/// Ein Draw-Batch: ein zusammenhängender Index-Bereich, der mit *einer*
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/// Textur gezeichnet wird.
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#[derive(Clone, Copy)]
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pub(crate) struct Batch {
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pub(crate) texture: usize,
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pub(crate) start: u32,
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pub(crate) count: u32,
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}
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/// CPU-seitige Welt-Geometrie, fertig zum Hochladen. Die Indizes sind nach
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/// Textur gruppiert; `batches` zeigt in diese Reihenfolge.
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#[derive(Default)]
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pub(crate) struct Mesh {
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pub(crate) verts: Vec<Vertex>,
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pub(crate) indices: Vec<u32>,
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pub(crate) batches: Vec<Batch>,
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}
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impl Mesh {
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/// Ein zweites Mesh anhängen (ein Vertex-/Index-Buffer für alles).
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/// Voraussetzung: beide wurden gegen *dieselbe* Texturliste gebaut —
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/// die Batch-Texturindizes bleiben dann unverändert gültig; nur die
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/// Buffer-Offsets verschieben sich.
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pub(crate) fn append(&mut self, other: Mesh) {
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let vbase = self.verts.len() as u32;
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let ibase = self.indices.len() as u32;
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self.verts.extend(other.verts);
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self.indices.extend(other.indices.iter().map(|i| i + vbase));
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self.batches.extend(other.batches.iter().map(|b| Batch {
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texture: b.texture,
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start: b.start + ibase,
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count: b.count,
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}));
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}
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}
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/// Spiegelt das `Uniforms`-Struct in scene.wgsl. `_pad` rundet die Größe
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/// auf 80 Byte (16er-Vielfaches), wie es die Uniform-Adressraum-Regeln
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/// von WGSL verlangen.
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#[repr(C)]
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#[derive(Clone, Copy, bytemuck::Pod, bytemuck::Zeroable)]
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struct Uniforms {
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mvp: [[f32; 4]; 4],
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half_res: [f32; 2],
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_pad: [f32; 2],
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}
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const VERTEX_LAYOUT: wgpu::VertexBufferLayout<'static> = wgpu::VertexBufferLayout {
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array_stride: size_of::<Vertex>() as u64,
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step_mode: wgpu::VertexStepMode::Vertex,
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attributes: &wgpu::vertex_attr_array![0 => Float32x3, 1 => Float32x2],
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};
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pub struct ScenePass {
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pipeline: wgpu::RenderPipeline,
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vbuf: wgpu::Buffer,
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ibuf: wgpu::Buffer,
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ubuf: wgpu::Buffer,
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uniform_bind: wgpu::BindGroup, // group 0
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tex_binds: Vec<wgpu::BindGroup>, // group 1, pro Textur
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batches: Vec<Batch>,
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}
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impl ScenePass {
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pub fn new(
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device: &wgpu::Device,
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queue: &wgpu::Queue,
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color_format: wgpu::TextureFormat,
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depth_format: wgpu::TextureFormat,
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mesh: &Mesh,
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images: &[Image],
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) -> Self {
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let shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
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label: Some("scene"),
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source: wgpu::ShaderSource::Wgsl(include_str!("scene.wgsl").into()),
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});
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let pipeline = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
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label: Some("scene"),
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layout: None,
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vertex: wgpu::VertexState {
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module: &shader,
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entry_point: Some("vs_main"),
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compilation_options: Default::default(),
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buffers: &[VERTEX_LAYOUT],
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},
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fragment: Some(wgpu::FragmentState {
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module: &shader,
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entry_point: Some("fs_main"),
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compilation_options: Default::default(),
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targets: &[Some(color_format.into())],
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}),
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// Back-face Culling: glTF-Dreiecke sind CCW von außen
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// gewickelt — die Außenflächen sind front-facing, Rückseiten
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// fallen weg. (Front-Face bleibt der wgpu-Default CCW.)
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primitive: wgpu::PrimitiveState {
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cull_mode: Some(wgpu::Face::Back),
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..Default::default()
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},
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depth_stencil: Some(wgpu::DepthStencilState {
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format: depth_format,
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depth_write_enabled: Some(true),
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depth_compare: Some(wgpu::CompareFunction::Less),
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stencil: wgpu::StencilState::default(),
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bias: wgpu::DepthBiasState::default(),
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}),
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multisample: wgpu::MultisampleState::default(),
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multiview_mask: None,
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cache: None,
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});
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let vbuf = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
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label: Some("scene vertices"),
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contents: bytemuck::cast_slice(&mesh.verts),
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usage: wgpu::BufferUsages::VERTEX,
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});
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let ibuf = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
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label: Some("scene indices"),
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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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let ubuf = device.create_buffer(&wgpu::BufferDescriptor {
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label: Some("scene uniforms"),
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size: size_of::<Uniforms>() as u64,
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usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
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mapped_at_creation: false,
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});
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let uniform_bind = device.create_bind_group(&wgpu::BindGroupDescriptor {
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label: Some("scene uniforms"),
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layout: &pipeline.get_bind_group_layout(0),
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entries: &[wgpu::BindGroupEntry {
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binding: 0,
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resource: ubuf.as_entire_binding(),
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}],
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});
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// mag=Nearest hält nah dran die harten Texel (der knackige Look);
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// min/mipmap=Linear glätten nur die Verkleinerung in der Ferne und
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// blenden weich zwischen den Mip-Ebenen (kein Mip-Popping). Killt das
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// Texel-Flimmern hochauflösender Texturen auf der kleinen internen
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// Auflösung. Mipmaps werden in upload_texture per Box-Filter erzeugt.
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let sampler = device.create_sampler(&wgpu::SamplerDescriptor {
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label: Some("scene"),
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address_mode_u: wgpu::AddressMode::Repeat,
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address_mode_v: wgpu::AddressMode::Repeat,
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mag_filter: wgpu::FilterMode::Nearest,
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min_filter: wgpu::FilterMode::Linear,
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mipmap_filter: wgpu::MipmapFilterMode::Linear,
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..Default::default()
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});
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let tex_layout = pipeline.get_bind_group_layout(1);
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let tex_binds = images.iter()
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.map(|img| upload_texture(device, queue, &tex_layout, &sampler, img))
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.collect();
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Self {
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pipeline, vbuf, ibuf, ubuf, uniform_bind, tex_binds,
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batches: mesh.batches.clone(),
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}
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}
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/// Uniforms für diesen Frame hochladen — vor dem Render-Pass rufen.
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/// `half_res` = halbe interne Auflösung (fürs Pixel-Snap im Shader).
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pub fn prepare(&self, queue: &wgpu::Queue, mvp: &Mat4, half_res: [f32; 2]) {
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let u = Uniforms { mvp: mvp.0, half_res, _pad: [0.0; 2] };
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queue.write_buffer(&self.ubuf, 0, bytemuck::bytes_of(&u));
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}
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pub fn draw(&self, pass: &mut wgpu::RenderPass) {
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pass.set_pipeline(&self.pipeline);
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pass.set_bind_group(0, &self.uniform_bind, &[]);
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pass.set_vertex_buffer(0, self.vbuf.slice(..));
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pass.set_index_buffer(self.ibuf.slice(..), wgpu::IndexFormat::Uint32);
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for b in &self.batches {
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pass.set_bind_group(1, &self.tex_binds[b.texture], &[]);
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pass.draw_indexed(b.start..b.start + b.count, 0, 0..1);
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}
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}
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}
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/// Ein RGBA8-`Image` als GPU-Textur hochladen und die zugehörige
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/// Bind-Group (Textur + Sampler, group 1) bauen. Erzeugt die volle
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/// Mipchain (bis 1×1) per Box-Filter auf der CPU und lädt jede Ebene hoch.
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fn upload_texture(
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device: &wgpu::Device,
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queue: &wgpu::Queue,
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layout: &wgpu::BindGroupLayout,
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sampler: &wgpu::Sampler,
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img: &Image,
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) -> wgpu::BindGroup {
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// floor(log2(max(w,h))) + 1 = volle Kette bis zur 1×1-Ebene.
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let mip_level_count = 32 - img.width.max(img.height).leading_zeros();
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let texture = device.create_texture(&wgpu::TextureDescriptor {
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label: Some("scene texture"),
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size: wgpu::Extent3d {
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width: img.width,
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height: img.height,
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depth_or_array_layers: 1,
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},
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mip_level_count,
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sample_count: 1,
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dimension: wgpu::TextureDimension::D2,
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// Nicht-sRGB: die Quantisierung im Shader erwartet rohe Werte.
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format: wgpu::TextureFormat::Rgba8Unorm,
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usage: wgpu::TextureUsages::TEXTURE_BINDING | wgpu::TextureUsages::COPY_DST,
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view_formats: &[],
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});
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// Ebene 0 ist das Originalbild; jede weitere wird aus der vorherigen
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// halbiert. `level` trägt die aktuell hochzuladenden Pixel.
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let mut level = img.rgba.clone();
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let (mut w, mut h) = (img.width, img.height);
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for mip in 0..mip_level_count {
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queue.write_texture(
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wgpu::TexelCopyTextureInfo {
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texture: &texture,
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mip_level: mip,
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origin: wgpu::Origin3d::ZERO,
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aspect: wgpu::TextureAspect::All,
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},
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&level,
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wgpu::TexelCopyBufferLayout {
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offset: 0,
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bytes_per_row: Some(w * 4),
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rows_per_image: Some(h),
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},
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wgpu::Extent3d { width: w, height: h, depth_or_array_layers: 1 },
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);
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if mip + 1 < mip_level_count {
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(level, w, h) = downsample(&level, w, h);
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}
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}
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let view = texture.create_view(&Default::default());
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device.create_bind_group(&wgpu::BindGroupDescriptor {
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label: Some("scene texture"),
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layout,
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entries: &[
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wgpu::BindGroupEntry { binding: 0, resource: wgpu::BindingResource::TextureView(&view) },
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wgpu::BindGroupEntry { binding: 1, resource: wgpu::BindingResource::Sampler(sampler) },
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],
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})
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}
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/// Eine RGBA8-Mip-Ebene per 2×2-Box-Filter auf die nächstkleinere halbieren.
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/// Gibt die neuen Pixel samt Maßen zurück. Ungerade Maße werden via `(d+1)/2`
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/// aufgerundet (sonst ginge die letzte Spalte/Zeile verloren); die fehlende
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/// Quell-Spalte/-Zeile wird auf den Rand geklemmt, statt den Mittelwert zu
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/// verfälschen. Mittelung im (gamma-kodierten) Speicherraum — für den
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/// stilisierten Look unkritisch.
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fn downsample(src: &[u8], w: u32, h: u32) -> (Vec<u8>, u32, u32) {
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let (nw, nh) = (w.div_ceil(2), h.div_ceil(2));
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let mut dst = vec![0u8; (nw * nh * 4) as usize];
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for y in 0..nh {
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for x in 0..nw {
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let (x0, y0) = (2 * x, 2 * y);
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let x1 = (x0 + 1).min(w - 1);
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let y1 = (y0 + 1).min(h - 1);
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let at = |px: u32, py: u32| ((py * w + px) * 4) as usize;
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let samples = [at(x0, y0), at(x1, y0), at(x0, y1), at(x1, y1)];
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let di = ((y * nw + x) * 4) as usize;
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for c in 0..4 {
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let sum: u32 = samples.iter().map(|&s| src[s + c] as u32).sum();
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dst[di + c] = ((sum + 2) / 4) as u8;
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}
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}
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}
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(dst, nw, nh)
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}
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