feat: add multi-light demo with orbiting point lights and spot light

Fix pbr_demo to use LightsUniform/LightData instead of old LightUniform.
Create multi_light_demo with 5 PBR spheres (varying metallic), a ground
plane, 4 colored orbiting point lights, a directional fill light, and a
spot light from above.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Cargo.toml

@@ -12,6 +12,7 @@ members = [
     "examples/hierarchy_demo",
     "examples/asset_demo",
     "examples/pbr_demo",
+    "examples/multi_light_demo",
 ]
 
 [workspace.dependencies]

examples/multi_light_demo/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "multi_light_demo"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+voltex_math.workspace = true
+voltex_platform.workspace = true
+voltex_renderer.workspace = true
+wgpu.workspace = true
+winit.workspace = true
+bytemuck.workspace = true
+pollster.workspace = true
+env_logger.workspace = true
+log.workspace = true

examples/multi_light_demo/src/main.rs

@@ -0,0 +1,562 @@
+use winit::{
+    application::ApplicationHandler,
+    event::WindowEvent,
+    event_loop::{ActiveEventLoop, EventLoop},
+    keyboard::{KeyCode, PhysicalKey},
+    window::WindowId,
+};
+use voltex_math::{Vec3, Mat4};
+use voltex_platform::{VoltexWindow, WindowConfig, InputState, GameTimer};
+use voltex_renderer::{
+    GpuContext, Camera, FpsController, CameraUniform, LightsUniform, LightData,
+    Mesh, GpuTexture, MaterialUniform, generate_sphere, create_pbr_pipeline, obj,
+};
+use wgpu::util::DeviceExt;
+
+const NUM_OBJECTS: usize = 6; // 5 spheres + 1 ground plane
+
+struct MultiLightApp {
+    state: Option<AppState>,
+}
+
+struct AppState {
+    window: VoltexWindow,
+    gpu: GpuContext,
+    pipeline: wgpu::RenderPipeline,
+    sphere_mesh: Mesh,
+    ground_mesh: Mesh,
+    camera: Camera,
+    fps_controller: FpsController,
+    camera_buffer: wgpu::Buffer,
+    light_buffer: wgpu::Buffer,
+    material_buffer: wgpu::Buffer,
+    camera_light_bind_group: wgpu::BindGroup,
+    _texture: GpuTexture,
+    material_bind_group: wgpu::BindGroup,
+    input: InputState,
+    timer: GameTimer,
+    cam_aligned_size: u32,
+    mat_aligned_size: u32,
+    time: f32,
+}
+
+fn camera_light_bind_group_layout(device: &wgpu::Device) -> wgpu::BindGroupLayout {
+    device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+        label: Some("Camera+Light Bind Group Layout"),
+        entries: &[
+            wgpu::BindGroupLayoutEntry {
+                binding: 0,
+                visibility: wgpu::ShaderStages::VERTEX | wgpu::ShaderStages::FRAGMENT,
+                ty: wgpu::BindingType::Buffer {
+                    ty: wgpu::BufferBindingType::Uniform,
+                    has_dynamic_offset: true,
+                    min_binding_size: wgpu::BufferSize::new(
+                        std::mem::size_of::<CameraUniform>() as u64,
+                    ),
+                },
+                count: None,
+            },
+            wgpu::BindGroupLayoutEntry {
+                binding: 1,
+                visibility: wgpu::ShaderStages::FRAGMENT,
+                ty: wgpu::BindingType::Buffer {
+                    ty: wgpu::BufferBindingType::Uniform,
+                    has_dynamic_offset: false,
+                    min_binding_size: None,
+                },
+                count: None,
+            },
+        ],
+    })
+}
+
+fn align_up(size: u32, alignment: u32) -> u32 {
+    ((size + alignment - 1) / alignment) * alignment
+}
+
+impl ApplicationHandler for MultiLightApp {
+    fn resumed(&mut self, event_loop: &ActiveEventLoop) {
+        let config = WindowConfig {
+            title: "Voltex - Multi-Light Demo".to_string(),
+            width: 1280,
+            height: 720,
+            ..Default::default()
+        };
+        let window = VoltexWindow::new(event_loop, &config);
+        let gpu = GpuContext::new(window.handle.clone());
+
+        // Dynamic uniform buffer alignment
+        let alignment = gpu.device.limits().min_uniform_buffer_offset_alignment;
+        let cam_aligned_size = align_up(std::mem::size_of::<CameraUniform>() as u32, alignment);
+        let mat_aligned_size = align_up(std::mem::size_of::<MaterialUniform>() as u32, alignment);
+
+        // Generate sphere mesh (shared by all 5 spheres)
+        let (vertices, indices) = generate_sphere(0.5, 32, 16);
+        let sphere_mesh = Mesh::new(&gpu.device, &vertices, &indices);
+
+        // Ground plane: cube.obj scaled to (10, 0.1, 10)
+        let obj_src = include_str!("../../../assets/cube.obj");
+        let obj_data = obj::parse_obj(obj_src);
+        let ground_mesh = Mesh::new(&gpu.device, &obj_data.vertices, &obj_data.indices);
+
+        // Camera at (0, 5, 12), looking down slightly
+        let aspect = gpu.config.width as f32 / gpu.config.height as f32;
+        let mut camera = Camera::new(Vec3::new(0.0, 5.0, 12.0), aspect);
+        camera.pitch = -0.3;
+        let fps_controller = FpsController::new();
+
+        // Initial lights uniform
+        let mut lights_uniform = LightsUniform::new();
+        lights_uniform.add_light(LightData::directional([0.0, -1.0, -0.5], [1.0, 1.0, 1.0], 0.3));
+        // Point lights at initial positions (will be updated per frame)
+        lights_uniform.add_light(LightData::point([5.0, 2.0, 0.0], [1.0, 0.0, 0.0], 15.0, 15.0));
+        lights_uniform.add_light(LightData::point([0.0, 2.0, 5.0], [0.0, 1.0, 0.0], 15.0, 15.0));
+        lights_uniform.add_light(LightData::point([-5.0, 2.0, 0.0], [0.0, 0.0, 1.0], 15.0, 15.0));
+        lights_uniform.add_light(LightData::point([0.0, 2.0, -5.0], [1.0, 1.0, 0.0], 15.0, 15.0));
+        lights_uniform.add_light(LightData::spot(
+            [0.0, 5.0, 0.0], [0.0, -1.0, 0.0], [1.0, 1.0, 1.0],
+            20.0, 10.0, 20.0, 35.0,
+        ));
+
+        // Camera dynamic uniform buffer (one CameraUniform per object)
+        let camera_buffer = gpu.device.create_buffer(&wgpu::BufferDescriptor {
+            label: Some("Camera Dynamic Uniform Buffer"),
+            size: (cam_aligned_size as usize * NUM_OBJECTS) as u64,
+            usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
+            mapped_at_creation: false,
+        });
+
+        let light_buffer = gpu.device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+            label: Some("Light Uniform Buffer"),
+            contents: bytemuck::cast_slice(&[lights_uniform]),
+            usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
+        });
+
+        // Material dynamic uniform buffer (one MaterialUniform per object)
+        let material_buffer = gpu.device.create_buffer(&wgpu::BufferDescriptor {
+            label: Some("Material Dynamic Uniform Buffer"),
+            size: (mat_aligned_size as usize * NUM_OBJECTS) as u64,
+            usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
+            mapped_at_creation: false,
+        });
+
+        // Bind group layouts
+        let cl_layout = camera_light_bind_group_layout(&gpu.device);
+        let tex_layout = GpuTexture::bind_group_layout(&gpu.device);
+        let mat_layout = MaterialUniform::bind_group_layout(&gpu.device);
+
+        // Camera+Light bind group
+        let camera_light_bind_group = gpu.device.create_bind_group(&wgpu::BindGroupDescriptor {
+            label: Some("Camera+Light Bind Group"),
+            layout: &cl_layout,
+            entries: &[
+                wgpu::BindGroupEntry {
+                    binding: 0,
+                    resource: wgpu::BindingResource::Buffer(wgpu::BufferBinding {
+                        buffer: &camera_buffer,
+                        offset: 0,
+                        size: wgpu::BufferSize::new(
+                            std::mem::size_of::<CameraUniform>() as u64,
+                        ),
+                    }),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 1,
+                    resource: light_buffer.as_entire_binding(),
+                },
+            ],
+        });
+
+        // Texture bind group (white 1x1)
+        let texture = GpuTexture::white_1x1(&gpu.device, &gpu.queue, &tex_layout);
+
+        // Material bind group
+        let material_bind_group = gpu.device.create_bind_group(&wgpu::BindGroupDescriptor {
+            label: Some("Material Bind Group"),
+            layout: &mat_layout,
+            entries: &[wgpu::BindGroupEntry {
+                binding: 0,
+                resource: wgpu::BindingResource::Buffer(wgpu::BufferBinding {
+                    buffer: &material_buffer,
+                    offset: 0,
+                    size: wgpu::BufferSize::new(
+                        std::mem::size_of::<MaterialUniform>() as u64,
+                    ),
+                }),
+            }],
+        });
+
+        // PBR pipeline
+        let pipeline = create_pbr_pipeline(
+            &gpu.device,
+            gpu.surface_format,
+            &cl_layout,
+            &tex_layout,
+            &mat_layout,
+        );
+
+        self.state = Some(AppState {
+            window,
+            gpu,
+            pipeline,
+            sphere_mesh,
+            ground_mesh,
+            camera,
+            fps_controller,
+            camera_buffer,
+            light_buffer,
+            material_buffer,
+            camera_light_bind_group,
+            _texture: texture,
+            material_bind_group,
+            input: InputState::new(),
+            timer: GameTimer::new(60),
+            cam_aligned_size,
+            mat_aligned_size,
+            time: 0.0,
+        });
+    }
+
+    fn window_event(
+        &mut self,
+        event_loop: &ActiveEventLoop,
+        _window_id: WindowId,
+        event: WindowEvent,
+    ) {
+        let state = match &mut self.state {
+            Some(s) => s,
+            None => return,
+        };
+
+        match event {
+            WindowEvent::CloseRequested => event_loop.exit(),
+
+            WindowEvent::KeyboardInput {
+                event:
+                    winit::event::KeyEvent {
+                        physical_key: PhysicalKey::Code(key_code),
+                        state: key_state,
+                        ..
+                    },
+                ..
+            } => {
+                let pressed = key_state == winit::event::ElementState::Pressed;
+                state.input.process_key(key_code, pressed);
+                if key_code == KeyCode::Escape && pressed {
+                    event_loop.exit();
+                }
+            }
+
+            WindowEvent::Resized(size) => {
+                state.gpu.resize(size.width, size.height);
+                if size.width > 0 && size.height > 0 {
+                    state.camera.aspect = size.width as f32 / size.height as f32;
+                }
+            }
+
+            WindowEvent::CursorMoved { position, .. } => {
+                state.input.process_mouse_move(position.x, position.y);
+            }
+
+            WindowEvent::MouseInput {
+                state: btn_state,
+                button,
+                ..
+            } => {
+                let pressed = btn_state == winit::event::ElementState::Pressed;
+                state.input.process_mouse_button(button, pressed);
+            }
+
+            WindowEvent::MouseWheel { delta, .. } => {
+                let y = match delta {
+                    winit::event::MouseScrollDelta::LineDelta(_, y) => y,
+                    winit::event::MouseScrollDelta::PixelDelta(pos) => pos.y as f32,
+                };
+                state.input.process_scroll(y);
+            }
+
+            WindowEvent::RedrawRequested => {
+                state.timer.tick();
+                let dt = state.timer.frame_dt();
+
+                // Camera input
+                if state
+                    .input
+                    .is_mouse_button_pressed(winit::event::MouseButton::Right)
+                {
+                    let (dx, dy) = state.input.mouse_delta();
+                    state
+                        .fps_controller
+                        .process_mouse(&mut state.camera, dx, dy);
+                }
+                let mut forward = 0.0f32;
+                let mut right = 0.0f32;
+                let mut up = 0.0f32;
+                if state.input.is_key_pressed(KeyCode::KeyW) {
+                    forward += 1.0;
+                }
+                if state.input.is_key_pressed(KeyCode::KeyS) {
+                    forward -= 1.0;
+                }
+                if state.input.is_key_pressed(KeyCode::KeyD) {
+                    right += 1.0;
+                }
+                if state.input.is_key_pressed(KeyCode::KeyA) {
+                    right -= 1.0;
+                }
+                if state.input.is_key_pressed(KeyCode::Space) {
+                    up += 1.0;
+                }
+                if state.input.is_key_pressed(KeyCode::ShiftLeft) {
+                    up -= 1.0;
+                }
+                state
+                    .fps_controller
+                    .process_movement(&mut state.camera, forward, right, up, dt);
+                state.input.begin_frame();
+
+                state.time += dt;
+
+                // Compute view-projection
+                let view_proj = state.camera.view_projection();
+                let cam_pos = [
+                    state.camera.position.x,
+                    state.camera.position.y,
+                    state.camera.position.z,
+                ];
+
+                let cam_aligned = state.cam_aligned_size as usize;
+                let mat_aligned = state.mat_aligned_size as usize;
+
+                // Build staging data for camera and material uniforms
+                let cam_total = NUM_OBJECTS * cam_aligned;
+                let mat_total = NUM_OBJECTS * mat_aligned;
+                let mut cam_staging = vec![0u8; cam_total];
+                let mut mat_staging = vec![0u8; mat_total];
+
+                // Object layout: indices 0..4 = spheres, index 5 = ground plane
+                // Spheres at y=0, x = [-4, -2, 0, 2, 4], metallic varies 0.0..1.0
+                for i in 0..5usize {
+                    let x = -4.0 + i as f32 * 2.0;
+                    let model = Mat4::translation(x, 0.0, 0.0);
+                    let cam_uniform = CameraUniform {
+                        view_proj: view_proj.cols,
+                        model: model.cols,
+                        camera_pos: cam_pos,
+                        _padding: 0.0,
+                    };
+                    let bytes = bytemuck::bytes_of(&cam_uniform);
+                    let offset = i * cam_aligned;
+                    cam_staging[offset..offset + bytes.len()].copy_from_slice(bytes);
+
+                    let metallic = i as f32 / 4.0;
+                    let mat_uniform = MaterialUniform::with_params(
+                        [0.8, 0.2, 0.2, 1.0],
+                        metallic,
+                        0.3,
+                    );
+                    let bytes = bytemuck::bytes_of(&mat_uniform);
+                    let offset = i * mat_aligned;
+                    mat_staging[offset..offset + bytes.len()].copy_from_slice(bytes);
+                }
+
+                // Ground plane at y=-0.5, scale (10, 0.1, 10)
+                {
+                    let i = 5;
+                    let model = Mat4::translation(0.0, -0.5, 0.0)
+                        .mul_mat4(&Mat4::scale(10.0, 0.1, 10.0));
+                    let cam_uniform = CameraUniform {
+                        view_proj: view_proj.cols,
+                        model: model.cols,
+                        camera_pos: cam_pos,
+                        _padding: 0.0,
+                    };
+                    let bytes = bytemuck::bytes_of(&cam_uniform);
+                    let offset = i * cam_aligned;
+                    cam_staging[offset..offset + bytes.len()].copy_from_slice(bytes);
+
+                    let mat_uniform = MaterialUniform::with_params(
+                        [0.5, 0.5, 0.5, 1.0],
+                        0.0,
+                        0.8,
+                    );
+                    let bytes = bytemuck::bytes_of(&mat_uniform);
+                    let offset = i * mat_aligned;
+                    mat_staging[offset..offset + bytes.len()].copy_from_slice(bytes);
+                }
+
+                state
+                    .gpu
+                    .queue
+                    .write_buffer(&state.camera_buffer, 0, &cam_staging);
+                state
+                    .gpu
+                    .queue
+                    .write_buffer(&state.material_buffer, 0, &mat_staging);
+
+                // Update lights with orbiting point lights
+                let radius = 5.0f32;
+                let time = state.time;
+                let mut lights_uniform = LightsUniform::new();
+
+                // Directional fill light
+                lights_uniform.add_light(LightData::directional(
+                    [0.0, -1.0, -0.5], [1.0, 1.0, 1.0], 0.3,
+                ));
+
+                // 4 orbiting point lights
+                let offsets = [0.0f32, std::f32::consts::FRAC_PI_2, std::f32::consts::PI, 3.0 * std::f32::consts::FRAC_PI_2];
+                let colors = [
+                    [1.0, 0.0, 0.0], // Red
+                    [0.0, 1.0, 0.0], // Green
+                    [0.0, 0.0, 1.0], // Blue
+                    [1.0, 1.0, 0.0], // Yellow
+                ];
+                for j in 0..4 {
+                    let angle = time + offsets[j];
+                    let px = radius * angle.cos();
+                    let pz = radius * angle.sin();
+                    lights_uniform.add_light(LightData::point(
+                        [px, 2.0, pz], colors[j], 15.0, 15.0,
+                    ));
+                }
+
+                // Spot light from above
+                lights_uniform.add_light(LightData::spot(
+                    [0.0, 5.0, 0.0], [0.0, -1.0, 0.0], [1.0, 1.0, 1.0],
+                    20.0, 10.0, 20.0, 35.0,
+                ));
+
+                state.gpu.queue.write_buffer(
+                    &state.light_buffer,
+                    0,
+                    bytemuck::cast_slice(&[lights_uniform]),
+                );
+
+                // Render
+                let output = match state.gpu.surface.get_current_texture() {
+                    Ok(t) => t,
+                    Err(wgpu::SurfaceError::Lost) => {
+                        let (w, h) = state.window.inner_size();
+                        state.gpu.resize(w, h);
+                        return;
+                    }
+                    Err(wgpu::SurfaceError::OutOfMemory) => {
+                        event_loop.exit();
+                        return;
+                    }
+                    Err(_) => return,
+                };
+
+                let view =
+                    output
+                        .texture
+                        .create_view(&wgpu::TextureViewDescriptor::default());
+                let mut encoder = state.gpu.device.create_command_encoder(
+                    &wgpu::CommandEncoderDescriptor {
+                        label: Some("Render Encoder"),
+                    },
+                );
+
+                {
+                    let mut render_pass =
+                        encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
+                            label: Some("Multi-Light Render Pass"),
+                            color_attachments: &[Some(wgpu::RenderPassColorAttachment {
+                                view: &view,
+                                resolve_target: None,
+                                depth_slice: None,
+                                ops: wgpu::Operations {
+                                    load: wgpu::LoadOp::Clear(wgpu::Color {
+                                        r: 0.05,
+                                        g: 0.05,
+                                        b: 0.08,
+                                        a: 1.0,
+                                    }),
+                                    store: wgpu::StoreOp::Store,
+                                },
+                            })],
+                            depth_stencil_attachment: Some(
+                                wgpu::RenderPassDepthStencilAttachment {
+                                    view: &state.gpu.depth_view,
+                                    depth_ops: Some(wgpu::Operations {
+                                        load: wgpu::LoadOp::Clear(1.0),
+                                        store: wgpu::StoreOp::Store,
+                                    }),
+                                    stencil_ops: None,
+                                },
+                            ),
+                            occlusion_query_set: None,
+                            timestamp_writes: None,
+                            multiview_mask: None,
+                        });
+
+                    render_pass.set_pipeline(&state.pipeline);
+                    render_pass.set_bind_group(1, &state._texture.bind_group, &[]);
+
+                    // Draw 5 spheres (objects 0..4)
+                    render_pass.set_vertex_buffer(0, state.sphere_mesh.vertex_buffer.slice(..));
+                    render_pass.set_index_buffer(
+                        state.sphere_mesh.index_buffer.slice(..),
+                        wgpu::IndexFormat::Uint32,
+                    );
+                    for i in 0..5u32 {
+                        let cam_offset = i * state.cam_aligned_size;
+                        let mat_offset = i * state.mat_aligned_size;
+                        render_pass.set_bind_group(
+                            0,
+                            &state.camera_light_bind_group,
+                            &[cam_offset],
+                        );
+                        render_pass.set_bind_group(
+                            2,
+                            &state.material_bind_group,
+                            &[mat_offset],
+                        );
+                        render_pass.draw_indexed(0..state.sphere_mesh.num_indices, 0, 0..1);
+                    }
+
+                    // Draw ground plane (object 5)
+                    render_pass.set_vertex_buffer(0, state.ground_mesh.vertex_buffer.slice(..));
+                    render_pass.set_index_buffer(
+                        state.ground_mesh.index_buffer.slice(..),
+                        wgpu::IndexFormat::Uint32,
+                    );
+                    {
+                        let cam_offset = 5u32 * state.cam_aligned_size;
+                        let mat_offset = 5u32 * state.mat_aligned_size;
+                        render_pass.set_bind_group(
+                            0,
+                            &state.camera_light_bind_group,
+                            &[cam_offset],
+                        );
+                        render_pass.set_bind_group(
+                            2,
+                            &state.material_bind_group,
+                            &[mat_offset],
+                        );
+                        render_pass.draw_indexed(0..state.ground_mesh.num_indices, 0, 0..1);
+                    }
+                }
+
+                state.gpu.queue.submit(std::iter::once(encoder.finish()));
+                output.present();
+            }
+
+            _ => {}
+        }
+    }
+
+    fn about_to_wait(&mut self, _event_loop: &ActiveEventLoop) {
+        if let Some(state) = &self.state {
+            state.window.request_redraw();
+        }
+    }
+}
+
+fn main() {
+    env_logger::init();
+    let event_loop = EventLoop::new().unwrap();
+    let mut app = MultiLightApp { state: None };
+    event_loop.run_app(&mut app).unwrap();
+}

examples/pbr_demo/src/main.rs

@@ -8,7 +8,7 @@ use winit::{
 use voltex_math::{Vec3, Mat4};
 use voltex_platform::{VoltexWindow, WindowConfig, InputState, GameTimer};
 use voltex_renderer::{
-    GpuContext, Camera, FpsController, CameraUniform, LightUniform,
+    GpuContext, Camera, FpsController, CameraUniform, LightsUniform, LightData,
     Mesh, GpuTexture, MaterialUniform, generate_sphere, create_pbr_pipeline,
 };
 use wgpu::util::DeviceExt;
@@ -99,13 +99,9 @@ impl ApplicationHandler for PbrDemoApp {
         let camera = Camera::new(Vec3::new(0.0, 0.0, 12.0), aspect);
         let fps_controller = FpsController::new();
 
-        // Light: direction [-1, -1, -1], color white, ambient 0.1
+        // Light: direction [-1, -1, -1], color white, intensity 1.0
-        let light_uniform = LightUniform {
+        let mut lights_uniform = LightsUniform::new();
-            direction: [-1.0, -1.0, -1.0],
+        lights_uniform.add_light(LightData::directional([-1.0, -1.0, -1.0], [1.0, 1.0, 1.0], 1.0));
-            _padding1: 0.0,
-            color: [1.0, 1.0, 1.0],
-            ambient_strength: 0.1,
-        };
 
         // Camera dynamic uniform buffer (one CameraUniform per sphere)
         let camera_buffer = gpu.device.create_buffer(&wgpu::BufferDescriptor {
@@ -117,7 +113,7 @@ impl ApplicationHandler for PbrDemoApp {
 
         let light_buffer = gpu.device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
             label: Some("Light Uniform Buffer"),
-            contents: bytemuck::cast_slice(&[light_uniform]),
+            contents: bytemuck::cast_slice(&[lights_uniform]),
             usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
         });
 
@@ -365,16 +361,12 @@ impl ApplicationHandler for PbrDemoApp {
                     .write_buffer(&state.material_buffer, 0, &mat_staging);
 
                 // Write light uniform
-                let light_uniform = LightUniform {
+                let mut lights_uniform = LightsUniform::new();
-                    direction: [-1.0, -1.0, -1.0],
+                lights_uniform.add_light(LightData::directional([-1.0, -1.0, -1.0], [1.0, 1.0, 1.0], 1.0));
-                    _padding1: 0.0,
-                    color: [1.0, 1.0, 1.0],
-                    ambient_strength: 0.1,
-                };
                 state.gpu.queue.write_buffer(
                     &state.light_buffer,
                     0,
-                    bytemuck::cast_slice(&[light_uniform]),
+                    bytemuck::cast_slice(&[lights_uniform]),
                 );
 
                 // Render