Merge pull request #1573 from erenoku/navigation_cube

Add navigation cube

Cargo.lock

@@ -51,6 +51,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2c99f64d1e06488f620f932677e24bc6e2897582980441ae90a671415bd7ec2f"
 dependencies = [
  "cfg-if",
+ "getrandom",
  "once_cell",
  "version_check",
 ]
@@ -581,6 +582,12 @@ dependencies = [
  "unicode-width",
 ]
 
+[[package]]
+name = "color_quant"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3d7b894f5411737b7867f4827955924d7c254fc9f4d91a6aad6b097804b1018b"
+
 [[package]]
 name = "concurrent-queue"
 version = "2.1.0"
@@ -1267,9 +1274,12 @@ dependencies = [
  "fj-interop",
  "fj-math",
  "getrandom",
+ "image",
+ "nalgebra",
  "raw-window-handle 0.5.0",
  "rfd",
  "thiserror",
+ "tobj",
  "tracing",
  "wgpu",
  "wgpu_glyph",
@@ -1807,6 +1817,21 @@ dependencies = [
  "unicode-normalization",
 ]
 
+[[package]]
+name = "image"
+version = "0.24.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "69b7ea949b537b0fd0af141fff8c77690f2ce96f4f41f042ccb6c69c6c965945"
+dependencies = [
+ "bytemuck",
+ "byteorder 1.4.3",
+ "color_quant",
+ "jpeg-decoder",
+ "num-rational",
+ "num-traits",
+ "png",
+]
+
 [[package]]
 name = "indexmap"
 version = "1.9.2"
@@ -1910,6 +1935,12 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8eaf4bc02d17cbdd7ff4c7438cafcdf7fb9a4613313ad11b4f8fefe7d3fa0130"
 
+[[package]]
+name = "jpeg-decoder"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bc0000e42512c92e31c2252315bda326620a4e034105e900c98ec492fa077b3e"
+
 [[package]]
 name = "js-sys"
 version = "0.3.61"
@@ -3737,6 +3768,15 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
 
+[[package]]
+name = "tobj"
+version = "3.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2d0bde887a49e2e09f30ba3b454cdba3fbc971703e436c527f9f69a035b45b9b"
+dependencies = [
+ "ahash 0.8.3",
+]
+
 [[package]]
 name = "tokio"
 version = "1.25.0"

assets/navigation_cube/cube.mtl

@@ -0,0 +1,62 @@
+# Blender 3.4.1 MTL File: 'cube.blend'
+# www.blender.org
+
+newmtl bottom
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+map_Kd bottom.png
+
+newmtl front
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+map_Kd front.png
+
+newmtl left
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+map_Kd left.png
+
+newmtl rear
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+map_Kd rear.png
+
+newmtl right
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+map_Kd right.png
+
+newmtl top
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+map_Kd top.png

assets/navigation_cube/cube.obj

@@ -0,0 +1,51 @@
+# Blender 3.4.1
+# www.blender.org
+mtllib cube.mtl
+o Cube
+v 1.000000 1.000000 1.000000
+v 1.000000 -1.000000 1.000000
+v -1.000000 1.000000 1.000000
+v -1.000000 -1.000000 1.000000
+v 1.000000 1.000000 -1.000000
+v 1.000000 -1.000000 -1.000000
+v -1.000000 1.000000 -1.000000
+v -1.000000 -1.000000 -1.000000
+vn -0.0000 1.0000 -0.0000
+vn -1.0000 -0.0000 -0.0000
+vn -0.0000 -0.0000 -1.0000
+vn -0.0000 -1.0000 -0.0000
+vn -0.0000 -0.0000 1.0000
+vn 1.0000 -0.0000 -0.0000
+vt 0.999900 0.000100
+vt 0.999900 0.999900
+vt 0.000100 0.999900
+vt 0.999900 0.999900
+vt 0.999900 0.000100
+vt 0.000100 0.000100
+vt 0.000100 0.000100
+vt 0.999900 0.999900
+vt 0.000100 0.999900
+vt 0.999900 0.000100
+vt 0.000100 0.999900
+vt 0.000100 0.000100
+vt 0.000100 0.999900
+vt 0.999900 0.999900
+vt 0.000100 0.000100
+vt 0.999900 0.000100
+vt 0.000100 0.999900
+vt 0.999900 0.999900
+vt 0.999900 0.000100
+vt 0.000100 0.000100
+s 0
+usemtl top
+f 1/1/1 5/14/1 7/17/1 3/7/1
+usemtl left
+f 4/10/2 3/8/2 7/17/2 8/20/2
+usemtl front
+f 2/5/5 1/2/5 3/9/5 4/12/5
+usemtl right
+f 6/16/6 5/14/6 1/3/6 2/6/6
+usemtl rear
+f 8/19/3 7/18/3 5/13/3 6/15/3
+usemtl bottom
+f 6/16/4 2/4/4 4/11/4 8/20/4

crates/fj-math/src/transform.rs

@@ -40,6 +40,13 @@ impl Transform {
         ))
     }
 
+    /// Construct a scaling
+    pub fn scale(scaling_factor: f64) -> Self {
+        Self(nalgebra::Transform::from_matrix_unchecked(
+            nalgebra::OMatrix::new_scaling(scaling_factor),
+        ))
+    }
+
     /// Transform the given point
     pub fn transform_point(&self, point: &Point<3>) -> Point<3> {
         Point::from(self.0.transform_point(&point.to_na()))
@@ -119,6 +126,11 @@ impl Transform {
         array.map(Scalar::from)
     }
 
+    /// Return a copy of the inner nalgebra transform
+    pub fn get_inner(&self) -> nalgebra::Transform<f64, nalgebra::TAffine, 3> {
+        self.0
+    }
+
     /// Transform the given axis-aligned bounding box
     pub fn transform_aabb(&self, aabb: &Aabb<3>) -> Aabb<3> {
         Aabb {

crates/fj-viewer/Cargo.toml

@@ -18,11 +18,18 @@ egui = "0.20.1"
 egui-wgpu = "0.20.0"
 fj-interop.workspace = true
 fj-math.workspace = true
+nalgebra = "0.32.1"
+tobj = "3.2.4"
 raw-window-handle = "0.5.0"
 thiserror = "1.0.35"
 tracing = "0.1.37"
 wgpu_glyph = "0.18.0"
 
+[dependencies.image]
+version = "0.24"
+default-features = false
+features = ["png", "jpeg"]
+
 [dependencies.rfd]
 version = "0.11.1"
 default_features = false

crates/fj-viewer/src/assets.rs

@@ -0,0 +1,59 @@
+pub struct Assets<'a> {
+    pub cube_obj: &'a [u8],
+    pub cube_mtl: &'a [u8],
+    pub front_texture: &'a [u8],
+    pub right_texture: &'a [u8],
+    pub rear_texture: &'a [u8],
+    pub left_texture: &'a [u8],
+    pub top_texture: &'a [u8],
+    pub bottom_texture: &'a [u8],
+}
+
+impl<'a> Assets<'a> {
+    pub fn get_instance() -> Self {
+        let cube_obj: &[u8] =
+            include_bytes!("../../../assets/navigation_cube/cube.obj");
+        let cube_mtl: &[u8] =
+            include_bytes!("../../../assets/navigation_cube/cube.mtl");
+        let front_texture: &[u8] =
+            include_bytes!("../../../assets/navigation_cube/front.png");
+        let right_texture: &[u8] =
+            include_bytes!("../../../assets/navigation_cube/right.png");
+        let rear_texture: &[u8] =
+            include_bytes!("../../../assets/navigation_cube/rear.png");
+        let left_texture: &[u8] =
+            include_bytes!("../../../assets/navigation_cube/left.png");
+        let top_texture: &[u8] =
+            include_bytes!("../../../assets/navigation_cube/top.png");
+        let bottom_texture: &[u8] =
+            include_bytes!("../../../assets/navigation_cube/bottom.png");
+
+        Self {
+            cube_obj,
+            cube_mtl,
+            front_texture,
+            right_texture,
+            rear_texture,
+            left_texture,
+            top_texture,
+            bottom_texture,
+        }
+    }
+
+    pub fn get_asset(&self, file_name: &str) -> &[u8] {
+        match file_name {
+            "cube.obj" => self.cube_obj,
+            "cube.mtl" => self.cube_mtl,
+            "front.png" => self.front_texture,
+            "right.png" => self.right_texture,
+            "rear.png" => self.rear_texture,
+            "left.png" => self.left_texture,
+            "top.png" => self.top_texture,
+            "bottom.png" => self.bottom_texture,
+            _ => unreachable!(
+                "An unknown asset: {} is trying to be loaded",
+                file_name
+            ),
+        }
+    }
+}

crates/fj-viewer/src/graphics/mod.rs

@@ -3,9 +3,12 @@
 mod draw_config;
 mod drawables;
 mod geometries;
+mod model;
+mod navigation_cube;
 mod pipelines;
 mod renderer;
 mod shaders;
+mod texture;
 mod transform;
 mod uniforms;
 mod vertices;

crates/fj-viewer/src/graphics/model.rs

@@ -0,0 +1,226 @@
+use std::ops::Range;
+
+use tobj::LoadError;
+use wgpu::util::DeviceExt;
+
+use super::texture::{self, LoadTextureError};
+use crate::assets::Assets;
+
+#[repr(C)]
+#[derive(Copy, Clone, Debug, bytemuck::Pod, bytemuck::Zeroable)]
+pub struct ModelVertex {
+    pub position: [f32; 3],
+    pub tex_coords: [f32; 2],
+}
+
+impl ModelVertex {
+    pub fn desc<'a>() -> wgpu::VertexBufferLayout<'a> {
+        use std::mem;
+        wgpu::VertexBufferLayout {
+            array_stride: mem::size_of::<ModelVertex>() as wgpu::BufferAddress,
+            step_mode: wgpu::VertexStepMode::Vertex,
+            attributes: &[
+                wgpu::VertexAttribute {
+                    offset: 0,
+                    shader_location: 0,
+                    format: wgpu::VertexFormat::Float32x3,
+                },
+                wgpu::VertexAttribute {
+                    offset: mem::size_of::<[f32; 3]>() as wgpu::BufferAddress,
+                    shader_location: 1,
+                    format: wgpu::VertexFormat::Float32x2,
+                },
+            ],
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct Model {
+    pub meshes: Vec<Mesh>,
+    pub materials: Vec<Material>,
+}
+
+#[derive(Debug)]
+pub struct Material {
+    pub name: String,
+    pub diffuse_texture: super::texture::Texture,
+    pub bind_group: wgpu::BindGroup,
+}
+
+#[derive(Debug)]
+pub struct Mesh {
+    pub name: String,
+    pub vertex_buffer: wgpu::Buffer,
+    pub index_buffer: wgpu::Buffer,
+    pub num_elements: u32,
+    pub material: usize,
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum LoadModelError {
+    #[error("Object loading error")]
+    ObjLoad(#[from] LoadError),
+
+    #[error("Load texture error")]
+    Texture(#[from] LoadTextureError),
+}
+
+pub fn load_model(
+    file_name: &str,
+    device: &wgpu::Device,
+    queue: &wgpu::Queue,
+    layout: &wgpu::BindGroupLayout,
+) -> Result<Model, LoadModelError> {
+    let assets = Assets::get_instance();
+
+    let (models, obj_materials) = tobj::load_obj_buf(
+        &mut assets.get_asset(file_name),
+        &tobj::LoadOptions {
+            triangulate: true,
+            single_index: true,
+            ..Default::default()
+        },
+        |p| {
+            tobj::load_mtl_buf(
+                &mut assets.get_asset(
+                    p.file_name()
+                        .unwrap()
+                        .to_str()
+                        .expect("OsStr could not be converted to a str"),
+                ),
+            )
+        },
+    )?;
+
+    let mut materials = Vec::new();
+    for m in obj_materials? {
+        let texture_data: &[u8] = assets.get_asset(m.diffuse_texture.as_str());
+
+        let diffuse_texture = texture::Texture::from_bytes(
+            device,
+            queue,
+            texture_data,
+            file_name,
+        )?;
+
+        let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
+            layout,
+            entries: &[
+                wgpu::BindGroupEntry {
+                    binding: 0,
+                    resource: wgpu::BindingResource::TextureView(
+                        &diffuse_texture.view,
+                    ),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 1,
+                    resource: wgpu::BindingResource::Sampler(
+                        &diffuse_texture.sampler,
+                    ),
+                },
+            ],
+            label: None,
+        });
+
+        materials.push(Material {
+            name: m.name,
+            diffuse_texture,
+            bind_group,
+        })
+    }
+
+    let meshes = models
+        .into_iter()
+        .map(|m| {
+            let vertices = (0..m.mesh.positions.len() / 3)
+                .map(|i| ModelVertex {
+                    position: [
+                        m.mesh.positions[i * 3],
+                        m.mesh.positions[i * 3 + 1],
+                        m.mesh.positions[i * 3 + 2],
+                    ],
+                    tex_coords: [
+                        m.mesh.texcoords[i * 2],
+                        1.0 - m.mesh.texcoords[i * 2 + 1],
+                    ],
+                })
+                .collect::<Vec<_>>();
+
+            let vertex_buffer =
+                device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+                    label: Some(&format!("{file_name:?} Vertex Buffer")),
+                    contents: bytemuck::cast_slice(&vertices),
+                    usage: wgpu::BufferUsages::VERTEX,
+                });
+            let index_buffer =
+                device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+                    label: Some(&format!("{file_name:?} Index Buffer")),
+                    contents: bytemuck::cast_slice(&m.mesh.indices),
+                    usage: wgpu::BufferUsages::INDEX,
+                });
+
+            Mesh {
+                name: file_name.to_string(),
+                vertex_buffer,
+                index_buffer,
+                num_elements: m.mesh.indices.len() as u32,
+                material: m.mesh.material_id.unwrap_or(0),
+            }
+        })
+        .collect::<Vec<_>>();
+
+    Ok(Model { meshes, materials })
+}
+
+pub trait DrawModel<'a> {
+    fn draw_mesh(&mut self, mesh: &'a Mesh, material: &'a Material);
+    fn draw_mesh_instanced(
+        &mut self,
+        mesh: &'a Mesh,
+        material: &'a Material,
+        instances: Range<u32>,
+    );
+
+    fn draw_model(&mut self, model: &'a Model);
+    fn draw_model_instanced(&mut self, model: &'a Model, instances: Range<u32>);
+}
+
+impl<'a, 'b> DrawModel<'b> for wgpu::RenderPass<'a>
+where
+    'b: 'a,
+{
+    fn draw_mesh(&mut self, mesh: &'b Mesh, material: &'b Material) {
+        self.draw_mesh_instanced(mesh, material, 0..1);
+    }
+
+    fn draw_mesh_instanced(
+        &mut self,
+        mesh: &'b Mesh,
+        material: &'b Material,
+        instances: Range<u32>,
+    ) {
+        self.set_vertex_buffer(0, mesh.vertex_buffer.slice(..));
+        self.set_index_buffer(
+            mesh.index_buffer.slice(..),
+            wgpu::IndexFormat::Uint32,
+        );
+        self.set_bind_group(0, &material.bind_group, &[]);
+        self.draw_indexed(0..mesh.num_elements, 0, instances);
+    }
+
+    fn draw_model(&mut self, model: &'b Model) {
+        self.draw_model_instanced(model, 0..1);
+    }
+
+    fn draw_model_instanced(
+        &mut self,
+        model: &'b Model,
+        instances: Range<u32>,
+    ) {
+        for mesh in &model.meshes {
+            let material = &model.materials[mesh.material];
+            self.draw_mesh_instanced(mesh, material, instances.clone());
+        }
+    }
+}

crates/fj-viewer/src/graphics/navigation_cube.rs

@@ -0,0 +1,220 @@
+use fj_math::Transform;
+use wgpu::util::DeviceExt;
+
+use super::model::{self, load_model, DrawModel, Model};
+
+#[derive(Debug)]
+pub struct NavigationCubeRenderer {
+    cube_model: Model,
+    render_pipeline: wgpu::RenderPipeline,
+    mvp_matrix_bind_group: wgpu::BindGroup,
+    mvp_matrix_buffer: wgpu::Buffer,
+}
+
+const SCALE_FACTOR: f64 = 0.13;
+const CUBE_TRANSLATION: [f64; 3] = [0.8, 0.7, 0.0];
+
+impl NavigationCubeRenderer {
+    pub fn new(
+        device: &wgpu::Device,
+        queue: &wgpu::Queue,
+        config: &wgpu::SurfaceConfiguration,
+        aspect_ratio: f64,
+    ) -> Self {
+        let texture_bind_group_layout =
+            device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+                entries: &[
+                    wgpu::BindGroupLayoutEntry {
+                        binding: 0,
+                        visibility: wgpu::ShaderStages::FRAGMENT,
+                        ty: wgpu::BindingType::Texture {
+                            multisampled: false,
+                            view_dimension: wgpu::TextureViewDimension::D2,
+                            sample_type: wgpu::TextureSampleType::Float {
+                                filterable: true,
+                            },
+                        },
+                        count: None,
+                    },
+                    wgpu::BindGroupLayoutEntry {
+                        binding: 1,
+                        visibility: wgpu::ShaderStages::FRAGMENT,
+                        ty: wgpu::BindingType::Sampler(
+                            wgpu::SamplerBindingType::Filtering,
+                        ),
+                        count: None,
+                    },
+                ],
+                label: Some("texture_bind_group_layout"),
+            });
+
+        let mvp_matrix =
+            Self::get_mvp_matrix(Transform::identity(), aspect_ratio);
+
+        let mvp_matrix_buffer =
+            device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+                label: Some("Model Matrix Buffer"),
+                contents: bytemuck::cast_slice(&[mvp_matrix]),
+                usage: wgpu::BufferUsages::UNIFORM
+                    | wgpu::BufferUsages::COPY_DST,
+            });
+        let mvp_matrix_bind_group_layout =
+            device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+                entries: &[wgpu::BindGroupLayoutEntry {
+                    binding: 0,
+                    visibility: wgpu::ShaderStages::VERTEX,
+                    ty: wgpu::BindingType::Buffer {
+                        ty: wgpu::BufferBindingType::Uniform,
+                        has_dynamic_offset: false,
+                        min_binding_size: None,
+                    },
+                    count: None,
+                }],
+                label: Some("mvp_matrix_group_layout"),
+            });
+        let mvp_matrix_bind_group =
+            device.create_bind_group(&wgpu::BindGroupDescriptor {
+                layout: &mvp_matrix_bind_group_layout,
+                entries: &[wgpu::BindGroupEntry {
+                    binding: 0,
+                    resource: mvp_matrix_buffer.as_entire_binding(),
+                }],
+                label: Some("mvp_matrix_bind_group"),
+            });
+
+        let shader =
+            device.create_shader_module(wgpu::ShaderModuleDescriptor {
+                label: Some("Shadow Display Shader"),
+                source: wgpu::ShaderSource::Wgsl(
+                    include_str!("navigation_cube.wgsl").into(),
+                ),
+            });
+
+        let render_pipeline_layout =
+            device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
+                label: Some("Render Pipeline Layout"),
+                bind_group_layouts: &[
+                    &texture_bind_group_layout,
+                    &mvp_matrix_bind_group_layout,
+                ],
+                push_constant_ranges: &[],
+            });
+
+        let render_pipeline =
+            device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
+                label: Some("Navigation Cube Renderer"),
+                layout: Some(&render_pipeline_layout),
+                vertex: wgpu::VertexState {
+                    module: &shader,
+                    entry_point: "vertex",
+                    buffers: &[model::ModelVertex::desc()],
+                },
+                fragment: Some(wgpu::FragmentState {
+                    module: &shader,
+                    entry_point: "fragment",
+                    targets: &[Some(wgpu::ColorTargetState {
+                        format: config.format,
+                        blend: Some(wgpu::BlendState {
+                            color: wgpu::BlendComponent::REPLACE,
+                            alpha: wgpu::BlendComponent::REPLACE,
+                        }),
+                        write_mask: wgpu::ColorWrites::ALL,
+                    })],
+                }),
+                primitive: wgpu::PrimitiveState {
+                    topology: wgpu::PrimitiveTopology::TriangleList,
+                    strip_index_format: None,
+                    front_face: wgpu::FrontFace::Ccw,
+                    cull_mode: Some(wgpu::Face::Back),
+                    // Setting this to anything other than Fill requires Features::POLYGON_MODE_LINE
+                    // or Features::POLYGON_MODE_POINT
+                    polygon_mode: wgpu::PolygonMode::Fill,
+                    // Requires Features::DEPTH_CLIP_CONTROL
+                    unclipped_depth: false,
+                    // Requires Features::CONSERVATIVE_RASTERIZATION
+                    conservative: false,
+                },
+                depth_stencil: None,
+                multisample: wgpu::MultisampleState {
+                    count: 1,
+                    mask: !0,
+                    alpha_to_coverage_enabled: false,
+                },
+                multiview: None,
+            });
+
+        let cube_model =
+            load_model("cube.obj", device, queue, &texture_bind_group_layout)
+                .unwrap();
+
+        Self {
+            cube_model,
+            render_pipeline,
+            mvp_matrix_bind_group,
+            mvp_matrix_buffer,
+        }
+    }
+
+    pub fn draw(
+        &mut self,
+        view: &wgpu::TextureView,
+        encoder: &mut wgpu::CommandEncoder,
+        queue: &wgpu::Queue,
+        aspect_ratio: f64,
+        rotation: Transform,
+    ) {
+        let mvp_matrix = Self::get_mvp_matrix(rotation, aspect_ratio);
+        queue.write_buffer(
+            &self.mvp_matrix_buffer,
+            0,
+            bytemuck::cast_slice(&[mvp_matrix]),
+        );
+
+        let mut render_pass =
+            encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
+                label: Some("Depth Visual Render Pass"),
+                color_attachments: &[Some(wgpu::RenderPassColorAttachment {
+                    view,
+                    resolve_target: None,
+                    ops: wgpu::Operations {
+                        load: wgpu::LoadOp::Load,
+                        store: true,
+                    },
+                })],
+                depth_stencil_attachment: None,
+            });
+        render_pass.set_pipeline(&self.render_pipeline);
+        render_pass.set_bind_group(1, &self.mvp_matrix_bind_group, &[]);
+        render_pass.draw_model(&self.cube_model);
+    }
+
+    fn get_mvp_matrix(rotation: Transform, aspect_ratio: f64) -> [f32; 16] {
+        let scale = Transform::scale(SCALE_FACTOR);
+        let world_translation = Transform::translation([0.0, 0.0, -1.0]);
+
+        let mut model_matrix = Transform::identity();
+        model_matrix = model_matrix * world_translation;
+        model_matrix = model_matrix * rotation;
+        model_matrix = model_matrix * scale;
+
+        let perspective =
+            nalgebra::Perspective3::new(aspect_ratio, 30.0, 0.1, 2.0);
+
+        let view_matrix = nalgebra::Matrix4::look_at_lh(
+            &nalgebra::Point3::new(0.0, 0.0, 0.0),
+            &nalgebra::Point3::new(0.0, 0.0, 1.0),
+            &nalgebra::Vector3::new(0.0, -1.0, 0.0),
+        );
+
+        let screen_translation = Transform::translation(CUBE_TRANSLATION);
+
+        let matrix = screen_translation.get_inner().matrix()
+            * *perspective.to_projective().matrix()
+            * view_matrix
+            * model_matrix.get_inner().matrix();
+
+        let mut mat = [0.; 16];
+        mat.copy_from_slice(matrix.as_slice());
+        mat.map(|x| x as f32)
+    }
+}

crates/fj-viewer/src/graphics/navigation_cube.wgsl

@@ -0,0 +1,36 @@
+// Vertex shader
+
+@group(1) @binding(0)
+var<uniform> mvp_matrix: mat4x4<f32>;
+
+struct VertexInput {
+    @location(0) position: vec3<f32>,
+    @location(1) tex_coords: vec2<f32>,
+}
+
+struct VertexOutput {
+    @builtin(position) clip_position: vec4<f32>,
+    @location(0) tex_coords: vec2<f32>,
+}
+
+@vertex
+fn vertex(
+    model: VertexInput,
+) -> VertexOutput {
+    var out: VertexOutput;
+    out.tex_coords = model.tex_coords;
+    out.clip_position = mvp_matrix * vec4<f32>(model.position, 1.0);
+    return out;
+}
+
+// Fragment shader
+
+@group(0) @binding(0)
+var t_diffuse: texture_2d<f32>;
+@group(0)@binding(1)
+var s_diffuse: sampler;
+
+@fragment
+fn fragment(in: VertexOutput) -> @location(0) vec4<f32> {
+    return textureSample(t_diffuse, s_diffuse, in.tex_coords);
+}

crates/fj-viewer/src/graphics/renderer.rs

@@ -13,8 +13,9 @@ use crate::{
 
 use super::{
     draw_config::DrawConfig, drawables::Drawables, geometries::Geometries,
-    pipelines::Pipelines, transform::Transform, uniforms::Uniforms,
-    vertices::Vertices, DEPTH_FORMAT, SAMPLE_COUNT,
+    navigation_cube::NavigationCubeRenderer, pipelines::Pipelines,
+    transform::Transform, uniforms::Uniforms, vertices::Vertices, DEPTH_FORMAT,
+    SAMPLE_COUNT,
 };
 
 /// Graphics rendering state and target abstraction
@@ -34,6 +35,8 @@ pub struct Renderer {
 
     geometries: Geometries,
     pipelines: Pipelines,
+
+    navigation_cube_renderer: NavigationCubeRenderer,
 }
 
 impl Renderer {
@@ -183,6 +186,13 @@ impl Renderer {
         let pipelines =
             Pipelines::new(&device, &bind_group_layout, color_format);
 
+        let navigation_cube_renderer = NavigationCubeRenderer::new(
+            &device,
+            &queue,
+            &surface_config,
+            800.0 / 600.0,
+        );
+
         Ok(Self {
             surface,
             features,
@@ -198,6 +208,8 @@ impl Renderer {
 
             geometries,
             pipelines,
+
+            navigation_cube_renderer,
         })
     }
 
@@ -331,6 +343,14 @@ impl Renderer {
             gui.draw(&mut render_pass, &clipped_primitives, &screen_descriptor);
         }
 
+        self.navigation_cube_renderer.draw(
+            &color_view,
+            &mut encoder,
+            &self.queue,
+            aspect_ratio,
+            camera.rotation,
+        );
+
         let command_buffer = encoder.finish();
         self.queue.submit(Some(command_buffer));
 

crates/fj-viewer/src/graphics/texture.rs

@@ -0,0 +1,86 @@
+use image::{GenericImageView, ImageError};
+use std::num::NonZeroU32;
+
+#[derive(Debug)]
+pub struct Texture {
+    pub texture: wgpu::Texture,
+    pub view: wgpu::TextureView,
+    pub sampler: wgpu::Sampler,
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum LoadTextureError {
+    #[error("Image processing error")]
+    ImageError(#[from] ImageError),
+}
+
+impl Texture {
+    pub fn from_bytes(
+        device: &wgpu::Device,
+        queue: &wgpu::Queue,
+        bytes: &[u8],
+        label: &str,
+    ) -> Result<Self, LoadTextureError> {
+        let img = image::load_from_memory(bytes)?;
+        Ok(Self::from_image(device, queue, &img, Some(label)))
+    }
+
+    pub fn from_image(
+        device: &wgpu::Device,
+        queue: &wgpu::Queue,
+        img: &image::DynamicImage,
+        label: Option<&str>,
+    ) -> Self {
+        let dimensions = img.dimensions();
+        let rgba = img.to_rgba8();
+
+        let size = wgpu::Extent3d {
+            width: dimensions.0,
+            height: dimensions.1,
+            depth_or_array_layers: 1,
+        };
+        let texture = device.create_texture(&wgpu::TextureDescriptor {
+            label,
+            size,
+            mip_level_count: 1,
+            sample_count: 1,
+            dimension: wgpu::TextureDimension::D2,
+            format: wgpu::TextureFormat::Rgba8UnormSrgb,
+            usage: wgpu::TextureUsages::TEXTURE_BINDING
+                | wgpu::TextureUsages::COPY_DST,
+        });
+
+        queue.write_texture(
+            wgpu::ImageCopyTexture {
+                aspect: wgpu::TextureAspect::All,
+                texture: &texture,
+                mip_level: 0,
+                origin: wgpu::Origin3d::ZERO,
+            },
+            &rgba,
+            wgpu::ImageDataLayout {
+                offset: 0,
+                bytes_per_row: NonZeroU32::new(4 * dimensions.0),
+                rows_per_image: NonZeroU32::new(dimensions.1),
+            },
+            size,
+        );
+
+        let view = texture.create_view(&wgpu::TextureViewDescriptor::default());
+        let sampler = device.create_sampler(&wgpu::SamplerDescriptor {
+            address_mode_u: wgpu::AddressMode::ClampToEdge,
+            address_mode_v: wgpu::AddressMode::ClampToEdge,
+            address_mode_w: wgpu::AddressMode::ClampToEdge,
+            mag_filter: wgpu::FilterMode::Linear,
+            min_filter: wgpu::FilterMode::Nearest,
+            mipmap_filter: wgpu::FilterMode::Nearest,
+            ..Default::default()
+        });
+
+        Self {
+            texture,
+            view,
+            sampler,
+        }
+    }
+}

crates/fj-viewer/src/lib.rs

@@ -14,6 +14,7 @@
 
 #![warn(missing_docs)]
 
+mod assets;
 mod camera;
 mod graphics;
 mod gui;