tawasuyu/llimphi

1//! Demo headless de M4: **entidades** (agentes) ray-marcheadas como cajas
2//! analíticas en el mismo pase que los voxels. Se mueven con posición sub-voxel
3//! (suave, no snapeada a la grilla), ocluyen y son ocluidas por el mundo voxel
4//! (esfera/pilares) por comparación de `t`, y proyectan sombras sobre el piso.
5//!
6//! Genera 3 frames con las entidades en distintas posiciones de una órbita para
7//! evidenciar el movimiento + oclusión + sombras.
8//!
9//! `cargo run -p llimphi-3d --example voxel_entities_demo --release -- [dim]`
10
11use std::fs::File;
12use std::io::BufWriter;
13
14use llimphi_3d::glam::Vec3;
15use llimphi_3d::{Camera3d, Entity3d, VoxelGrid, VoxelRenderer};
16use llimphi_hal::{wgpu, Hal};
17use llimphi_raster::peniko::Color;
18use llimphi_raster::{vello, Renderer};
19
20const W: u32 = 720;
21const H: u32 = 480;
22const FMT: wgpu::TextureFormat = wgpu::TextureFormat::Rgba8Unorm;
23
24fn main() {
25    let dim: u32 = std::env::args().nth(1).and_then(|s| s.parse().ok()).unwrap_or(64);
26    let d = dim as f32;
27
28    let hal = pollster::block_on(Hal::new(None)).expect("hal");
29    let mut renderer = Renderer::new(&hal).expect("renderer");
30
31    let grid = VoxelGrid::demo_scene([dim, dim, dim]);
32    let mut vr = VoxelRenderer::new(&hal.device, &hal.queue, FMT, &grid);
33
34    let camera = Camera3d::orbit(Vec3::ZERO, 35_f32.to_radians(), 30_f32.to_radians(), d * 1.7);
35
36    let colors = [[235u8, 70, 70], [70, 220, 110], [90, 130, 250], [240, 200, 60]];
37
38    for (fi, phase) in [0.0_f32, 0.9, 1.8].iter().enumerate() {
39        // 4 entidades orbitando el centro a media altura, con bobeo vertical.
40        // Una pasa por delante de la esfera y otra por detrás → oclusión mutua.
41        vr.entities.clear();
42        for k in 0..4 {
43            let a = phase + k as f32 * std::f32::consts::FRAC_PI_2;
44            let radius = d * 0.42;
45            let pos = [
46                d * 0.5 + a.cos() * radius,
47                d * (0.45 + 0.12 * (a * 1.3).sin()),
48                d * 0.5 + a.sin() * radius,
49            ];
50            vr.entities.push(Entity3d {
51                pos,
52                half: [d * 0.05, d * 0.05, d * 0.05],
53                color: colors[k],
54            });
55        }
56        let out = format!("/tmp/m4_frame{fi}.png");
57        render_frame(&hal, &mut renderer, &mut vr, &camera, &out);
58        eprintln!("frame {fi}: {} entidades → {out}", vr.entities.len());
59    }
60    eprintln!("voxel_entities_demo: /tmp/m4_frame0..2.png (dim={dim}³)");
61}
62
63fn render_frame(
64    hal: &Hal,
65    renderer: &mut Renderer,
66    vr: &mut VoxelRenderer,
67    camera: &Camera3d,
68    out: &str,
69) {
70    let inter = hal.device.create_texture(&wgpu::TextureDescriptor {
71        label: Some("inter"),
72        size: wgpu::Extent3d {
73            width: W,
74            height: H,
75            depth_or_array_layers: 1,
76        },
77        mip_level_count: 1,
78        sample_count: 1,
79        dimension: wgpu::TextureDimension::D2,
80        format: FMT,
81        usage: wgpu::TextureUsages::STORAGE_BINDING
82            | wgpu::TextureUsages::TEXTURE_BINDING
83            | wgpu::TextureUsages::RENDER_ATTACHMENT
84            | wgpu::TextureUsages::COPY_SRC,
85        view_formats: &[],
86    });
87    let inter_view = inter.create_view(&wgpu::TextureViewDescriptor::default());
88
89    let base = vello::Scene::new();
90    renderer
91        .render_to_view(hal, &base, &inter_view, W, H, Color::from_rgba8(18, 22, 32, 255))
92        .expect("render base");
93
94    let mut enc = hal
95        .device
96        .create_command_encoder(&wgpu::CommandEncoderDescriptor { label: Some("voxel-pass") });
97    vr.render(&hal.device, &hal.queue, &mut enc, &inter_view, (W, H), camera);
98    hal.queue.submit(std::iter::once(enc.finish()));
99    let _ = hal.device.poll(wgpu::PollType::wait_indefinitely());
100
101    write_png(hal, &inter, out);
102}
103
104fn write_png(hal: &Hal, target: &wgpu::Texture, path: &str) {
105    let unpadded = (W * 4) as usize;
106    let align = wgpu::COPY_BYTES_PER_ROW_ALIGNMENT as usize;
107    let padded = unpadded.div_ceil(align) * align;
108    let buf = hal.device.create_buffer(&wgpu::BufferDescriptor {
109        label: Some("readback"),
110        size: (padded * H as usize) as u64,
111        usage: wgpu::BufferUsages::MAP_READ | wgpu::BufferUsages::COPY_DST,
112        mapped_at_creation: false,
113    });
114    let mut enc = hal
115        .device
116        .create_command_encoder(&wgpu::CommandEncoderDescriptor { label: None });
117    enc.copy_texture_to_buffer(
118        wgpu::TexelCopyTextureInfo {
119            texture: target,
120            mip_level: 0,
121            origin: wgpu::Origin3d::ZERO,
122            aspect: wgpu::TextureAspect::All,
123        },
124        wgpu::TexelCopyBufferInfo {
125            buffer: &buf,
126            layout: wgpu::TexelCopyBufferLayout {
127                offset: 0,
128                bytes_per_row: Some(padded as u32),
129                rows_per_image: Some(H),
130            },
131        },
132        wgpu::Extent3d {
133            width: W,
134            height: H,
135            depth_or_array_layers: 1,
136        },
137    );
138    hal.queue.submit(std::iter::once(enc.finish()));
139    let slice = buf.slice(..);
140    let (tx, rx) = std::sync::mpsc::channel();
141    slice.map_async(wgpu::MapMode::Read, move |r| {
142        let _ = tx.send(r);
143    });
144    let _ = hal.device.poll(wgpu::PollType::wait_indefinitely());
145    rx.recv().unwrap().unwrap();
146    let data = slice.get_mapped_range();
147    let mut pixels = Vec::with_capacity((W * H * 4) as usize);
148    for row in 0..H as usize {
149        let s = row * padded;
150        pixels.extend_from_slice(&data[s..s + unpadded]);
151    }
152    drop(data);
153    buf.unmap();
154    let file = File::create(path).expect("png");
155    let mut enc = png::Encoder::new(BufWriter::new(file), W, H);
156    enc.set_color(png::ColorType::Rgba);
157    enc.set_depth(png::BitDepth::Eight);
158    let mut w = enc.write_header().unwrap();
159    w.write_image_data(&pixels).unwrap();
160}