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+checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
+
+[[package]]
+name = "windows_i686_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
+
+[[package]]
+name = "winnow"
+version = "0.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0e97b544156e9bebe1a0ffbc03484fc1ffe3100cbce3ffb17eac35f7cdd7ab36"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "xml-rs"
+version = "0.8.25"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c5b940ebc25896e71dd073bad2dbaa2abfe97b0a391415e22ad1326d9c54e3c4"
+
+[[package]]
+name = "zerocopy"
+version = "0.8.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fd97444d05a4328b90e75e503a34bad781f14e28a823ad3557f0750df1ebcbc6"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.8.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6352c01d0edd5db859a63e2605f4ea3183ddbd15e2c4a9e7d32184df75e4f154"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "zune-core"
+version = "0.4.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f423a2c17029964870cfaabb1f13dfab7d092a62a29a89264f4d36990ca414a"
+
+[[package]]
+name = "zune-inflate"
+version = "0.2.54"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73ab332fe2f6680068f3582b16a24f90ad7096d5d39b974d1c0aff0125116f02"
+dependencies = [
+ "simd-adler32",
+]
+
+[[package]]
+name = "zune-jpeg"
+version = "0.4.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "99a5bab8d7dedf81405c4bb1f2b83ea057643d9cb28778cea9eecddeedd2e028"
+dependencies = [
+ "zune-core",
+]

diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644 (file)
index 0000000..84e754c
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "digichrome"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+bpaf = "0.9.19"
+bytemuck = "1.22.0"
+image = "0.25.5"
+pollster = "0.4.0"
+rawloader = "0.37.1"
+wgpu = "24.0.1"

diff --git a/flake.lock b/flake.lock
new file mode 100644 (file)
index 0000000..6102570
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,66 @@
+{
+  "nodes": {
+    "fenix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-analyzer-src": "rust-analyzer-src"
+      },
+      "locked": {
+        "lastModified": 1742279664,
+        "narHash": "sha256-K/gD8271/eRjwks4EX1fLHCjb4UzdUqDCGdwNh4TwIw=",
+        "owner": "nix-community",
+        "repo": "fenix",
+        "rev": "193dcb4e6edb3ba927f4d88b8b1fe65b9e5368c3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "fenix",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1742268799,
+        "narHash": "sha256-IhnK4LhkBlf14/F8THvUy3xi/TxSQkp9hikfDZRD4Ic=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "da044451c6a70518db5b730fe277b70f494188f1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-24.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "fenix": "fenix",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "rust-analyzer-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1742249107,
+        "narHash": "sha256-3jVOcCZgXBvQ2HsjgHXmZow9/3d1K4oRwVyvhYfnvyg=",
+        "owner": "rust-lang",
+        "repo": "rust-analyzer",
+        "rev": "31e412c290f6ff6de4548e94e187477f072b179e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rust-lang",
+        "ref": "nightly",
+        "repo": "rust-analyzer",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

diff --git a/flake.nix b/flake.nix
new file mode 100644 (file)
index 0000000..f425c9b
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,25 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
+    fenix = {
+      url = "github:nix-community/fenix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs = { self, nixpkgs, fenix }:
+    let
+      system = "aarch64-darwin";
+      pkgs = nixpkgs.legacyPackages.${system};
+      fpkgs = fenix.packages.${system};
+      rust = with fpkgs; combine (with stable; [
+        defaultToolchain
+        rust-analyzer
+        rust-src
+      ]);
+    in rec {
+      devShells.${system}.default = pkgs.mkShell {
+        packages = [ rust ];
+      };
+    };
+}

diff --git a/src/demosaic/lmmse.rs b/src/demosaic/lmmse.rs
new file mode 100644 (file)
index 0000000..1dc3094
--- /dev/null
+++ b/src/demosaic/lmmse.rs
@@ -0,0 +1,165 @@
+pub struct Lmmse {
+       interpolate_bind_layout: wgpu::BindGroupLayout,
+       interpolate_pipeline_layout: wgpu::PipelineLayout,
+       interpolate_shader: wgpu::ShaderModule,
+       interpolate_pipeline: wgpu::ComputePipeline,
+}
+
+impl super::Demosaic for Lmmse {
+       fn new(gpu: &wgpu::Device, queue: &wgpu::Queue) -> Self {
+               let interpolate_bind_layout = gpu.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+                       label: None,
+                       entries: &[
+                               wgpu::BindGroupLayoutEntry {
+                                       binding: 0,
+                                       visibility: wgpu::ShaderStages::COMPUTE,
+                                       ty: wgpu::BindingType::StorageTexture {
+                                               access: wgpu::StorageTextureAccess::ReadOnly,
+                                               format: wgpu::TextureFormat::R16Uint,
+                                               view_dimension: wgpu::TextureViewDimension::D2,
+                                       },
+                                       count: None,
+                               },
+                               wgpu::BindGroupLayoutEntry {
+                                       binding: 1,
+                                       visibility: wgpu::ShaderStages::COMPUTE,
+                                       ty: wgpu::BindingType::StorageTexture {
+                                               access: wgpu::StorageTextureAccess::WriteOnly,
+                                               format: wgpu::TextureFormat::Rgba32Float,
+                                               view_dimension: wgpu::TextureViewDimension::D2,
+                                       },
+                                       count: None,
+                               }
+                       ],
+               });
+               let interpolate_pipeline_layout = gpu.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
+                       label: None,
+                       bind_group_layouts: &[&interpolate_bind_layout],
+                       push_constant_ranges: &[],
+               });
+               let interpolate_shader = gpu.create_shader_module(wgpu::ShaderModuleDescriptor {
+                       label: None,
+                       source: wgpu::ShaderSource::Wgsl(include_str!("lmmse_01_interpolate.wgsl").into()),
+               });
+               let interpolate_pipeline = gpu.create_compute_pipeline(&wgpu::ComputePipelineDescriptor {
+                       label: None,
+                       layout: Some(&interpolate_pipeline_layout),
+                       module: &interpolate_shader,
+                       entry_point: None,
+                       compilation_options: wgpu::PipelineCompilationOptions::default(),
+                       cache: None,
+               });
+
+               Self {
+                       interpolate_bind_layout,
+                       interpolate_pipeline_layout,
+                       interpolate_shader,
+                       interpolate_pipeline,
+               }
+       }
+
+       fn demoasic(&self, gpu: &wgpu::Device, queue: &wgpu::Queue, image: &rawloader::RawImage) -> wgpu::Texture {
+               let input_texture = gpu.create_texture(&wgpu::TextureDescriptor {
+                       label: None,
+                       size: wgpu::Extent3d {
+                               width: image.width as u32,
+                               height: image.height as u32,
+                               depth_or_array_layers: 1,
+                       },
+                       mip_level_count: 1,
+                       sample_count: 1,
+                       dimension: wgpu::TextureDimension::D2,
+                       format: wgpu::TextureFormat::R16Uint,
+                       usage: wgpu::TextureUsages::COPY_DST | wgpu::TextureUsages::STORAGE_BINDING,
+                       view_formats: &[wgpu::TextureFormat::R16Uint],
+               });
+
+               let image_data = match &image.data {
+                       rawloader::RawImageData::Integer(d) => d.as_slice(),
+                       _ => panic!("Unsupported input format"),
+               };
+               queue.write_texture(
+                       wgpu::TexelCopyTextureInfo {
+                               texture: &input_texture,
+                               mip_level: 0,
+                               origin: wgpu::Origin3d::ZERO,
+                               aspect: wgpu::TextureAspect::All,
+                       },
+                       bytemuck::cast_slice(image_data),
+                       wgpu::TexelCopyBufferLayout {
+                               offset: 0,
+                               bytes_per_row: Some(2 * image.width as u32),
+                               rows_per_image: Some(image.height as u32),
+                       },
+                       wgpu::Extent3d {
+                               width: image.width as u32,
+                               height: image.height as u32,
+                               depth_or_array_layers: 1,
+                       }
+               );
+
+               let output_texture = gpu.create_texture(&wgpu::TextureDescriptor {
+                       label: None,
+                       size: wgpu::Extent3d {
+                               width: image.width as u32,
+                               height: image.height as u32,
+                               depth_or_array_layers: 1,
+                       },
+                       mip_level_count: 1,
+                       sample_count: 1,
+                       dimension: wgpu::TextureDimension::D2,
+                       format: wgpu::TextureFormat::Rgba32Float,
+                       usage: wgpu::TextureUsages::COPY_SRC | wgpu::TextureUsages::STORAGE_BINDING,
+                       view_formats: &[wgpu::TextureFormat::Rgba32Float],
+               });
+
+               let bind_group = gpu.create_bind_group(&wgpu::BindGroupDescriptor {
+                       label: None,
+                       layout: &self.interpolate_bind_layout,
+                       entries: &[
+                               wgpu::BindGroupEntry {
+                                       binding: 0,
+                                       resource: wgpu::BindingResource::TextureView(&input_texture.create_view(&wgpu::TextureViewDescriptor {
+                                               label: None,
+                                               format: Some(wgpu::TextureFormat::R16Uint),
+                                               dimension: Some(wgpu::TextureViewDimension::D2),
+                                               usage: Some(wgpu::TextureUsages::STORAGE_BINDING),
+                                               aspect: wgpu::TextureAspect::All,
+                                               base_mip_level: 0,
+                                               mip_level_count: None,
+                                               base_array_layer: 0,
+                                               array_layer_count: None,
+                                       })),
+                               },
+                               wgpu::BindGroupEntry {
+                                       binding: 1,
+                                       resource: wgpu::BindingResource::TextureView(&output_texture.create_view(&wgpu::TextureViewDescriptor {
+                                               label: None,
+                                               format: Some(wgpu::TextureFormat::Rgba32Float),
+                                               dimension: Some(wgpu::TextureViewDimension::D2),
+                                               usage: Some(wgpu::TextureUsages::STORAGE_BINDING),
+                                               aspect: wgpu::TextureAspect::All,
+                                               base_mip_level: 0,
+                                               mip_level_count: None,
+                                               base_array_layer: 0,
+                                               array_layer_count: None,
+                                       })),
+                               },
+                       ],
+               });
+
+               let mut encoder = gpu.create_command_encoder(&wgpu::CommandEncoderDescriptor {
+                       label: None,
+               });
+               {
+                       let mut pass = encoder.begin_compute_pass(&wgpu::ComputePassDescriptor { label: None, timestamp_writes: None });
+                       pass.set_bind_group(0, &bind_group, &[]);
+                       pass.set_pipeline(&self.interpolate_pipeline);
+                       pass.dispatch_workgroups((image.width as u32).div_ceil(8), (image.height as u32).div_ceil(8), 1);
+               }
+               let command_buf = encoder.finish();
+               queue.submit([command_buf]);
+
+               output_texture
+       }
+}

diff --git a/src/demosaic/lmmse_01_interpolate.wgsl b/src/demosaic/lmmse_01_interpolate.wgsl
new file mode 100644 (file)
index 0000000..57cd328
--- /dev/null
+++ b/src/demosaic/lmmse_01_interpolate.wgsl
@@ -0,0 +1,11 @@
+@group(0) @binding(0)
+var input_tex: texture_storage_2d<r16uint, read>;
+
+@group(0) @binding(1)
+var output_tex: texture_storage_2d<rgba32float, write>;
+
+@compute @workgroup_size(8, 8)
+fn main(@builtin(global_invocation_id) global_id: vec3<u32>) {
+       let texel = textureLoad(input_tex, global_id.xy);
+       textureStore(output_tex, global_id.xy, vec4<f32>(texel) / 1024f);       
+}

diff --git a/src/demosaic/mod.rs b/src/demosaic/mod.rs
new file mode 100644 (file)
index 0000000..4e74f4b
--- /dev/null
+++ b/src/demosaic/mod.rs
@@ -0,0 +1,7 @@
+pub trait Demosaic {
+       fn new(gpu: &wgpu::Device, queue: &wgpu::Queue) -> Self where Self: Sized;
+       fn demoasic(&self, gpu: &wgpu::Device, queue: &wgpu::Queue, image: &rawloader::RawImage) -> wgpu::Texture;
+}
+
+pub mod lmmse;
+pub use lmmse::Lmmse;

diff --git a/src/main.rs b/src/main.rs
new file mode 100644 (file)
index 0000000..53f3a41
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,95 @@
+use std::path::PathBuf;
+
+use bpaf::{construct, positional, OptionParser, Parser};
+use demosaic::Demosaic;
+use image::buffer::ConvertBuffer;
+
+mod demosaic;
+mod pipeline;
+
+#[derive(Clone, Debug)]
+struct Args {
+    paths: Vec<PathBuf>
+}
+
+fn args() -> OptionParser<Args> {
+    let paths = positional("FILE").some("must process at least one image");
+
+    construct!(Args { paths })
+        .to_options()
+        .descr("Intuitive raw photo processing engine")
+}
+
+fn main() {
+    // Parse arguments
+    let args = args().fallback_to_usage().run();
+
+    // Initialize GPU
+    let instance = wgpu::Instance::new(&wgpu::InstanceDescriptor::default());
+    let adapter = pollster::block_on(instance.request_adapter(&wgpu::RequestAdapterOptions::default())).unwrap();
+
+    let downlevel_caps = adapter.get_downlevel_capabilities();
+    if !downlevel_caps.flags.contains(wgpu::DownlevelFlags::COMPUTE_SHADERS) {
+        panic!("GPU does not support compute");
+    }
+
+    let (gpu, queue) = pollster::block_on(adapter.request_device(&wgpu::DeviceDescriptor {
+        label: None,
+        required_features: wgpu::Features::TEXTURE_ADAPTER_SPECIFIC_FORMAT_FEATURES,
+        required_limits: wgpu::Limits::default(),
+        memory_hints: wgpu::MemoryHints::MemoryUsage,
+    }, None)).unwrap();
+
+    // Process images
+    for path in &args.paths {
+        let image = rawloader::decode_file(path).unwrap();
+        dbg!(&image.cfa);
+
+        let pipeline = pipeline::Resources {
+            demosaic: Box::new(demosaic::Lmmse::new(&gpu, &queue))
+        };
+        let demosaiced = pipeline.demosaic.demoasic(&gpu, &queue, &image);
+
+        let readback_buf = gpu.create_buffer(&wgpu::BufferDescriptor {
+            label: None,
+            size: 4 * 4 * image.width as u64 * image.height as u64,
+            usage: wgpu::BufferUsages::MAP_READ | wgpu::BufferUsages::COPY_DST,
+            mapped_at_creation: false,
+        });
+        let mut encoder = gpu.create_command_encoder(&wgpu::CommandEncoderDescriptor {
+            label: None,
+        });
+        encoder.copy_texture_to_buffer(
+            wgpu::TexelCopyTextureInfo {
+                texture: &demosaiced,
+                mip_level: 0,
+                origin: wgpu::Origin3d::ZERO,
+                aspect: wgpu::TextureAspect::All,
+            },
+            wgpu::TexelCopyBufferInfo {
+                buffer: &readback_buf,
+                layout: wgpu::TexelCopyBufferLayout {
+                    offset: 0,
+                    bytes_per_row: Some(4 * 4 * image.width as u32),
+                    rows_per_image: Some(image.height as u32),
+                },
+            },
+            wgpu::Extent3d {
+                width: image.width as u32,
+                height: image.height as u32,
+                depth_or_array_layers: 1,
+            }
+        );
+        queue.submit([encoder.finish()]);
+
+        let readback_slice = readback_buf.slice(..);
+        readback_slice.map_async(wgpu::MapMode::Read, |_| {});
+        gpu.poll(wgpu::Maintain::Wait);
+        {
+            let readback_data = readback_slice.get_mapped_range();
+            let result_image = image::ImageBuffer::<image::Rgba<f32>, _>::from_raw(image.width as u32, image.height as u32, bytemuck::cast_slice(&readback_data)).unwrap();
+            <_ as ConvertBuffer<image::ImageBuffer<image::Rgb<u16>, Vec<u16>>>>::convert(&result_image).save_with_format("out.png", image::ImageFormat::Png).unwrap();
+        }
+        readback_buf.unmap();
+    }
+}

diff --git a/src/pipeline.rs b/src/pipeline.rs
new file mode 100644 (file)
index 0000000..3ef02d6
--- /dev/null
+++ b/src/pipeline.rs
@@ -0,0 +1,5 @@
+use crate::demosaic::Demosaic;
+
+pub struct Resources {
+       pub demosaic: Box<dyn Demosaic>,
+}