tawasuyu/llimphi

1//! Catálogo de la **nueva tanda de materiales de terreno**: una fila de bloques,
2//! cada uno de un material (tierra, arcilla, grava, arenisca, basalto, granito,
3//! mármol, hielo, lava, musgo) con su color + un jitter de grano por vóxel.
4//!
5//! `cargo run -p llimphi-voxel --example materials_demo --release` → `/tmp/materials.png`
6
7use std::fs::File;
8use std::io::BufWriter;
9
10use llimphi_3d::glam::Vec3;
11use llimphi_3d::{Atmosphere, Camera3d, Scene3d, VoxelGrid, VoxelRenderer};
12use llimphi_hal::{wgpu, Hal};
13use llimphi_raster::peniko::Color;
14use llimphi_raster::{vello, Renderer};
15use llimphi_voxel::Material;
16
17const W: u32 = 1280;
18const H: u32 = 480;
19const FMT: wgpu::TextureFormat = wgpu::TextureFormat::Rgba8Unorm;
20
21// Hash barato para el jitter de grano (mismo espíritu que worldgen::grained).
22fn jitter(base: [u8; 3], x: i32, y: i32, z: i32, grain: f32) -> [u8; 3] {
23    let mut h = (x as u32)
24        .wrapping_mul(0x9E37_79B9)
25        .wrapping_add((y as u32).wrapping_mul(0x85EB_CA77))
26        .wrapping_add((z as u32).wrapping_mul(0xC2B2_AE35));
27    h ^= h >> 15;
28    h = h.wrapping_mul(0x2C1B_3C6D);
29    h ^= h >> 13;
30    let r = (h & 0xFF) as f32 / 255.0;
31    let f = 1.0 + (r - 0.5) * 2.0 * grain * 0.22;
32    let c = |v: u8| (v as f32 * f).clamp(0.0, 255.0) as u8;
33    [c(base[0]), c(base[1]), c(base[2])]
34}
35
36fn main() {
37    let fila = [
38        Material::Tierra,
39        Material::Arcilla,
40        Material::Grava,
41        Material::Arenisca,
42        Material::Basalto,
43        Material::Granito,
44        Material::Marmol,
45        Material::Hielo,
46        Material::Lava,
47        Material::Musgo,
48    ];
49    let s: i32 = 7; // lado del bloque
50    let gap: i32 = 3;
51    let step = s + gap;
52    let margin = 4;
53    let dim = [
54        (fila.len() as i32 * step + 2 * margin) as u32,
55        (s + 8) as u32,
56        (s + 8) as u32,
57    ];
58    let mut grid = VoxelGrid::new(dim);
59    let cz = dim[2] as i32 / 2;
60    for (i, mat) in fila.iter().enumerate() {
61        let col = mat.color();
62        let grain = mat.grain();
63        let x0 = margin + i as i32 * step;
64        for dx in 0..s {
65            for dy in 0..s {
66                for dz in 0..s {
67                    let (x, y, z) = (x0 + dx, 1 + dy, cz - s / 2 + dz);
68                    grid.set(x as u32, y as u32, z as u32, jitter(col, x, y, z, grain));
69                }
70            }
71        }
72        eprintln!("{:>9}: color {:?} grano {:.2}", mat.label(), col, grain);
73    }
74
75    let hal = pollster::block_on(Hal::new(None)).expect("hal");
76    let mut renderer = Renderer::new(&hal).expect("renderer");
77    let mut vr = VoxelRenderer::new(&hal.device, &hal.queue, FMT, &grid);
78    vr.sun_dir = [0.35, 0.72, 0.55];
79    vr.atmosphere = Atmosphere {
80        sky_zenith: [92, 120, 168],
81        sky_horizon: [196, 208, 222],
82        fog_density: 0.0,
83        god_rays: 0.0,
84    };
85    let camera = Camera3d::orbit(
86        Vec3::new(0.0, s as f32 * 0.3, 0.0),
87        10_f32.to_radians(),
88        24_f32.to_radians(),
89        dim[0] as f32 * 0.7,
90    );
91    let mut scene = Scene3d::new();
92    let pixels = render(&hal, &mut renderer, &mut scene, &mut vr, &camera);
93    write_png(&pixels, "/tmp/materials.png");
94    eprintln!("escrito /tmp/materials.png — nueva tanda de 10 materiales de terreno");
95}
96
97fn render(
98    hal: &Hal,
99    renderer: &mut Renderer,
100    scene: &mut Scene3d,
101    vr: &mut VoxelRenderer,
102    camera: &Camera3d,
103) -> Vec<u8> {
104    let inter = hal.device.create_texture(&wgpu::TextureDescriptor {
105        label: Some("inter"),
106        size: wgpu::Extent3d { width: W, height: H, depth_or_array_layers: 1 },
107        mip_level_count: 1,
108        sample_count: 1,
109        dimension: wgpu::TextureDimension::D2,
110        format: FMT,
111        usage: wgpu::TextureUsages::STORAGE_BINDING
112            | wgpu::TextureUsages::TEXTURE_BINDING
113            | wgpu::TextureUsages::RENDER_ATTACHMENT
114            | wgpu::TextureUsages::COPY_SRC,
115        view_formats: &[],
116    });
117    let view = inter.create_view(&wgpu::TextureViewDescriptor::default());
118    renderer
119        .render_to_view(hal, &vello::Scene::new(), &view, W, H, Color::from_rgba8(0, 0, 0, 255))
120        .expect("base");
121    let mut enc = hal
122        .device
123        .create_command_encoder(&wgpu::CommandEncoderDescriptor { label: Some("materials") });
124    scene.render(&hal.device, &hal.queue, &mut enc, &view, (W, H), camera, Some(vr), &[]);
125    hal.queue.submit(std::iter::once(enc.finish()));
126    let _ = hal.device.poll(wgpu::PollType::wait_indefinitely());
127    readback(hal, &inter)
128}
129
130fn readback(hal: &Hal, target: &wgpu::Texture) -> Vec<u8> {
131    let unpadded = (W * 4) as usize;
132    let align = wgpu::COPY_BYTES_PER_ROW_ALIGNMENT as usize;
133    let padded = unpadded.div_ceil(align) * align;
134    let buf = hal.device.create_buffer(&wgpu::BufferDescriptor {
135        label: Some("readback"),
136        size: (padded * H as usize) as u64,
137        usage: wgpu::BufferUsages::MAP_READ | wgpu::BufferUsages::COPY_DST,
138        mapped_at_creation: false,
139    });
140    let mut enc = hal
141        .device
142        .create_command_encoder(&wgpu::CommandEncoderDescriptor { label: None });
143    enc.copy_texture_to_buffer(
144        wgpu::TexelCopyTextureInfo {
145            texture: target,
146            mip_level: 0,
147            origin: wgpu::Origin3d::ZERO,
148            aspect: wgpu::TextureAspect::All,
149        },
150        wgpu::TexelCopyBufferInfo {
151            buffer: &buf,
152            layout: wgpu::TexelCopyBufferLayout {
153                offset: 0,
154                bytes_per_row: Some(padded as u32),
155                rows_per_image: Some(H),
156            },
157        },
158        wgpu::Extent3d { width: W, height: H, depth_or_array_layers: 1 },
159    );
160    hal.queue.submit(std::iter::once(enc.finish()));
161    let slice = buf.slice(..);
162    let (tx, rx) = std::sync::mpsc::channel();
163    slice.map_async(wgpu::MapMode::Read, move |r| {
164        let _ = tx.send(r);
165    });
166    let _ = hal.device.poll(wgpu::PollType::wait_indefinitely());
167    rx.recv().unwrap().unwrap();
168    let data = slice.get_mapped_range();
169    let mut pixels = Vec::with_capacity((W * H * 4) as usize);
170    for row in 0..H as usize {
171        let srow = row * padded;
172        pixels.extend_from_slice(&data[srow..srow + unpadded]);
173    }
174    drop(data);
175    buf.unmap();
176    pixels
177}
178
179fn write_png(pixels: &[u8], path: &str) {
180    let file = File::create(path).expect("png");
181    let mut enc = png::Encoder::new(BufWriter::new(file), W, H);
182    enc.set_color(png::ColorType::Rgba);
183    enc.set_depth(png::BitDepth::Eight);
184    let mut wtr = enc.write_header().unwrap();
185    wtr.write_image_data(pixels).unwrap();
186}