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feat: add shadow demo with directional light shadow mapping and 3x3 PCF

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- Add Mat4::orthographic() to voltex_math for light projection
- Fix pbr_demo and multi_light_demo to provide shadow bind group (group 3)
  required by updated PBR pipeline (dummy shadow with size=0 disables it)
- Create shadow_demo with two-pass rendering: shadow depth pass using
  orthographic light projection, then PBR color pass with shadow sampling
- Scene: ground plane, 3 spheres, 2 cubes with directional light

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
tolelom
2026-03-24 21:09:27 +09:00
parent 8f962368e9
commit 5f962f376e
7 changed files with 726 additions and 1 deletions
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30
Cargo.lock generated
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@@ -989,6 +989,21 @@ dependencies = [
"winit",
]
[[package]]
name = "multi_light_demo"
version = "0.1.0"
dependencies = [
"bytemuck",
"env_logger",
"log",
"pollster",
"voltex_math",
"voltex_platform",
"voltex_renderer",
"wgpu",
"winit",
]
[[package]]
name = "naga"
version = "28.0.0"
@@ -1697,6 +1712,21 @@ dependencies = [
"syn",
]
[[package]]
name = "shadow_demo"
version = "0.1.0"
dependencies = [
"bytemuck",
"env_logger",
"log",
"pollster",
"voltex_math",
"voltex_platform",
"voltex_renderer",
"wgpu",
"winit",
]
[[package]]
name = "shlex"
version = "1.3.0"

1
Cargo.toml
View File

@@ -13,6 +13,7 @@ members = [
"examples/asset_demo",
"examples/pbr_demo",
"examples/multi_light_demo",
"examples/shadow_demo",
]
[workspace.dependencies]

26
crates/voltex_math/src/mat4.rs
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@@ -161,6 +161,19 @@ impl Mat4 {
}
}
/// Orthographic projection (wgpu NDC: z [0,1])
pub fn orthographic(left: f32, right: f32, bottom: f32, top: f32, near: f32, far: f32) -> Self {
let rml = right - left;
let tmb = top - bottom;
let fmn = far - near;
Self::from_cols(
[2.0 / rml, 0.0, 0.0, 0.0],
[0.0, 2.0 / tmb, 0.0, 0.0],
[0.0, 0.0, -1.0 / fmn, 0.0],
[-(right + left) / rml, -(top + bottom) / tmb, -near / fmn, 1.0],
)
}
/// Return the transpose of this matrix.
pub fn transpose(&self) -> Self {
let c = &self.cols;
@@ -314,7 +327,18 @@ mod tests {
}
}
// 8. as_slice — identity diagonal
// 8. Orthographic projection
#[test]
fn test_orthographic() {
let proj = Mat4::orthographic(-10.0, 10.0, -10.0, 10.0, 0.1, 100.0);
// Center point should map to (0, 0, ~0)
let p = proj * Vec4::new(0.0, 0.0, -0.1, 1.0);
let ndc = Vec3::new(p.x / p.w, p.y / p.w, p.z / p.w);
assert!(approx_eq(ndc.x, 0.0));
assert!(approx_eq(ndc.y, 0.0));
}
// 9. as_slice — identity diagonal
#[test]
fn test_as_slice() {
let slice = Mat4::IDENTITY.as_slice();

27
examples/multi_light_demo/src/main.rs
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@@ -10,6 +10,7 @@ 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,
ShadowMap, ShadowUniform,
};
use wgpu::util::DeviceExt;
@@ -33,6 +34,8 @@ struct AppState {
camera_light_bind_group: wgpu::BindGroup,
_texture: GpuTexture,
material_bind_group: wgpu::BindGroup,
shadow_bind_group: wgpu::BindGroup,
_shadow_map: ShadowMap,
input: InputState,
timer: GameTimer,
cam_aligned_size: u32,
@@ -186,6 +189,26 @@ impl ApplicationHandler for MultiLightApp {
}],
});
// Shadow resources (dummy — shadows disabled)
let shadow_map = ShadowMap::new(&gpu.device);
let shadow_layout = ShadowMap::bind_group_layout(&gpu.device);
let shadow_uniform = ShadowUniform {
light_view_proj: [[0.0; 4]; 4],
shadow_map_size: 0.0,
shadow_bias: 0.0,
_padding: [0.0; 2],
};
let shadow_uniform_buffer = gpu.device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
label: Some("Shadow Uniform Buffer"),
contents: bytemuck::cast_slice(&[shadow_uniform]),
usage: wgpu::BufferUsages::UNIFORM,
});
let shadow_bind_group = shadow_map.create_bind_group(
&gpu.device,
&shadow_layout,
&shadow_uniform_buffer,
);
// PBR pipeline
let pipeline = create_pbr_pipeline(
&gpu.device,
@@ -193,6 +216,7 @@ impl ApplicationHandler for MultiLightApp {
&cl_layout,
&tex_layout,
&mat_layout,
&shadow_layout,
);
self.state = Some(AppState {
@@ -209,6 +233,8 @@ impl ApplicationHandler for MultiLightApp {
camera_light_bind_group,
_texture: texture,
material_bind_group,
shadow_bind_group,
_shadow_map: shadow_map,
input: InputState::new(),
timer: GameTimer::new(60),
cam_aligned_size,
@@ -493,6 +519,7 @@ impl ApplicationHandler for MultiLightApp {
render_pass.set_pipeline(&state.pipeline);
render_pass.set_bind_group(1, &state._texture.bind_group, &[]);
render_pass.set_bind_group(3, &state.shadow_bind_group, &[]);
// Draw 5 spheres (objects 0..4)
render_pass.set_vertex_buffer(0, state.sphere_mesh.vertex_buffer.slice(..));

27
examples/pbr_demo/src/main.rs
View File

@@ -10,6 +10,7 @@ use voltex_platform::{VoltexWindow, WindowConfig, InputState, GameTimer};
use voltex_renderer::{
GpuContext, Camera, FpsController, CameraUniform, LightsUniform, LightData,
Mesh, GpuTexture, MaterialUniform, generate_sphere, create_pbr_pipeline,
ShadowMap, ShadowUniform,
};
use wgpu::util::DeviceExt;
@@ -34,6 +35,8 @@ struct AppState {
camera_light_bind_group: wgpu::BindGroup,
_texture: GpuTexture,
material_bind_group: wgpu::BindGroup,
shadow_bind_group: wgpu::BindGroup,
_shadow_map: ShadowMap,
input: InputState,
timer: GameTimer,
cam_aligned_size: u32,
@@ -171,6 +174,26 @@ impl ApplicationHandler for PbrDemoApp {
}],
});
// Shadow resources (dummy — shadows disabled)
let shadow_map = ShadowMap::new(&gpu.device);
let shadow_layout = ShadowMap::bind_group_layout(&gpu.device);
let shadow_uniform = ShadowUniform {
light_view_proj: [[0.0; 4]; 4],
shadow_map_size: 0.0,
shadow_bias: 0.0,
_padding: [0.0; 2],
};
let shadow_uniform_buffer = gpu.device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
label: Some("Shadow Uniform Buffer"),
contents: bytemuck::cast_slice(&[shadow_uniform]),
usage: wgpu::BufferUsages::UNIFORM,
});
let shadow_bind_group = shadow_map.create_bind_group(
&gpu.device,
&shadow_layout,
&shadow_uniform_buffer,
);
// PBR pipeline
let pipeline = create_pbr_pipeline(
&gpu.device,
@@ -178,6 +201,7 @@ impl ApplicationHandler for PbrDemoApp {
&cl_layout,
&tex_layout,
&mat_layout,
&shadow_layout,
);
self.state = Some(AppState {
@@ -193,6 +217,8 @@ impl ApplicationHandler for PbrDemoApp {
camera_light_bind_group,
_texture: texture,
material_bind_group,
shadow_bind_group,
_shadow_map: shadow_map,
input: InputState::new(),
timer: GameTimer::new(60),
cam_aligned_size,
@@ -429,6 +455,7 @@ impl ApplicationHandler for PbrDemoApp {
render_pass.set_pipeline(&state.pipeline);
render_pass.set_bind_group(1, &state._texture.bind_group, &[]);
render_pass.set_bind_group(3, &state.shadow_bind_group, &[]);
render_pass.set_vertex_buffer(0, state.mesh.vertex_buffer.slice(..));
render_pass.set_index_buffer(
state.mesh.index_buffer.slice(..),

15
examples/shadow_demo/Cargo.toml Normal file
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@@ -0,0 +1,15 @@
[package]
name = "shadow_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

601
examples/shadow_demo/src/main.rs Normal file
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@@ -0,0 +1,601 @@
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,
ShadowMap, ShadowUniform, ShadowPassUniform, SHADOW_MAP_SIZE,
create_shadow_pipeline, shadow_pass_bind_group_layout,
};
use wgpu::util::DeviceExt;
/// 6 objects: ground plane, 3 spheres, 2 cubes
const NUM_OBJECTS: usize = 6;
struct ShadowDemoApp {
state: Option<AppState>,
}
struct AppState {
window: VoltexWindow,
gpu: GpuContext,
pbr_pipeline: wgpu::RenderPipeline,
shadow_pipeline: wgpu::RenderPipeline,
sphere_mesh: Mesh,
cube_mesh: Mesh,
camera: Camera,
fps_controller: FpsController,
// Color pass resources
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,
// Shadow resources
shadow_map: ShadowMap,
shadow_uniform_buffer: wgpu::Buffer,
shadow_bind_group: wgpu::BindGroup,
shadow_pass_buffer: wgpu::Buffer,
shadow_pass_bind_group: wgpu::BindGroup,
// Misc
input: InputState,
timer: GameTimer,
cam_aligned_size: u32,
mat_aligned_size: u32,
shadow_pass_aligned_size: u32,
}
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
}
/// Model matrices for the 6 scene objects.
fn object_models() -> [Mat4; NUM_OBJECTS] {
[
// 0: ground plane — cube scaled (15, 0.1, 15) at y=-0.5
Mat4::translation(0.0, -0.5, 0.0).mul_mat4(&Mat4::scale(15.0, 0.1, 15.0)),
// 1-3: spheres (unit sphere radius 0.5)
Mat4::translation(-3.0, 1.0, 0.0),
Mat4::translation(0.0, 1.5, 0.0),
Mat4::translation(3.0, 0.8, 0.0),
// 4-5: cubes
Mat4::translation(-1.5, 0.5, -2.0),
Mat4::translation(1.5, 0.5, 2.0),
]
}
/// Material parameters for each object (base_color, metallic, roughness).
fn object_materials() -> [([ f32; 4], f32, f32); NUM_OBJECTS] {
[
([0.7, 0.7, 0.7, 1.0], 0.0, 0.8), // ground: light gray
([0.9, 0.2, 0.2, 1.0], 0.3, 0.4), // sphere: red
([0.2, 0.9, 0.2, 1.0], 0.5, 0.3), // sphere: green
([0.2, 0.2, 0.9, 1.0], 0.1, 0.6), // sphere: blue
([0.9, 0.8, 0.2, 1.0], 0.7, 0.2), // cube: yellow
([0.8, 0.3, 0.8, 1.0], 0.2, 0.5), // cube: purple
]
}
/// Returns true if the object at index `i` uses the cube mesh; false → sphere.
fn is_cube(i: usize) -> bool {
i == 0 || i == 4 || i == 5
}
impl ApplicationHandler for ShadowDemoApp {
fn resumed(&mut self, event_loop: &ActiveEventLoop) {
let config = WindowConfig {
title: "Voltex - Shadow 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);
let shadow_pass_aligned_size = align_up(std::mem::size_of::<ShadowPassUniform>() as u32, alignment);
// Meshes
let (sphere_verts, sphere_idx) = generate_sphere(0.5, 32, 16);
let sphere_mesh = Mesh::new(&gpu.device, &sphere_verts, &sphere_idx);
let obj_src = include_str!("../../../assets/cube.obj");
let obj_data = obj::parse_obj(obj_src);
let cube_mesh = Mesh::new(&gpu.device, &obj_data.vertices, &obj_data.indices);
// Camera at (8, 8, 12) looking toward origin
let aspect = gpu.config.width as f32 / gpu.config.height as f32;
let mut camera = Camera::new(Vec3::new(8.0, 8.0, 12.0), aspect);
camera.pitch = -0.4;
// Compute yaw to look toward origin
let to_origin = Vec3::ZERO - camera.position;
camera.yaw = to_origin.x.atan2(-to_origin.z);
let fps_controller = FpsController::new();
// Light
let mut lights_uniform = LightsUniform::new();
lights_uniform.ambient_color = [0.05, 0.05, 0.05];
lights_uniform.add_light(LightData::directional(
[-1.0, -2.0, -1.0],
[1.0, 1.0, 1.0],
2.0,
));
// ---- Color pass buffers ----
let camera_buffer = gpu.device.create_buffer(&wgpu::BufferDescriptor {
label: Some("Camera Dynamic UBO"),
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 UBO"),
contents: bytemuck::cast_slice(&[lights_uniform]),
usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
});
let material_buffer = gpu.device.create_buffer(&wgpu::BufferDescriptor {
label: Some("Material Dynamic UBO"),
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 BG"),
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 (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 BG"),
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),
}),
}],
});
// ---- Shadow resources ----
let shadow_map = ShadowMap::new(&gpu.device);
let shadow_layout = ShadowMap::bind_group_layout(&gpu.device);
let shadow_uniform = ShadowUniform {
light_view_proj: Mat4::IDENTITY.cols,
shadow_map_size: SHADOW_MAP_SIZE as f32,
shadow_bias: 0.005,
_padding: [0.0; 2],
};
let shadow_uniform_buffer = gpu.device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
label: Some("Shadow Uniform Buffer"),
contents: bytemuck::cast_slice(&[shadow_uniform]),
usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
});
let shadow_bind_group = shadow_map.create_bind_group(
&gpu.device,
&shadow_layout,
&shadow_uniform_buffer,
);
// Shadow pass dynamic UBO (one ShadowPassUniform per object)
let sp_layout = shadow_pass_bind_group_layout(&gpu.device);
let shadow_pass_buffer = gpu.device.create_buffer(&wgpu::BufferDescriptor {
label: Some("Shadow Pass Dynamic UBO"),
size: (shadow_pass_aligned_size as usize * NUM_OBJECTS) as u64,
usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
mapped_at_creation: false,
});
let shadow_pass_bind_group = gpu.device.create_bind_group(&wgpu::BindGroupDescriptor {
label: Some("Shadow Pass BG"),
layout: &sp_layout,
entries: &[wgpu::BindGroupEntry {
binding: 0,
resource: wgpu::BindingResource::Buffer(wgpu::BufferBinding {
buffer: &shadow_pass_buffer,
offset: 0,
size: wgpu::BufferSize::new(std::mem::size_of::<ShadowPassUniform>() as u64),
}),
}],
});
// ---- Pipelines ----
let shadow_pipeline = create_shadow_pipeline(&gpu.device, &sp_layout);
let pbr_pipeline = create_pbr_pipeline(
&gpu.device,
gpu.surface_format,
&cl_layout,
&tex_layout,
&mat_layout,
&shadow_layout,
);
self.state = Some(AppState {
window,
gpu,
pbr_pipeline,
shadow_pipeline,
sphere_mesh,
cube_mesh,
camera,
fps_controller,
camera_buffer,
light_buffer,
material_buffer,
camera_light_bind_group,
_texture: texture,
material_bind_group,
shadow_map,
shadow_uniform_buffer,
shadow_bind_group,
shadow_pass_buffer,
shadow_pass_bind_group,
input: InputState::new(),
timer: GameTimer::new(60),
cam_aligned_size,
mat_aligned_size,
shadow_pass_aligned_size,
});
}
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();
// ----- Compute light VP -----
let light_dir = Vec3::new(-1.0, -2.0, -1.0).normalize();
let light_pos = Vec3::ZERO - light_dir * 20.0;
let light_view = Mat4::look_at(light_pos, Vec3::ZERO, Vec3::Y);
let light_proj = Mat4::orthographic(-15.0, 15.0, -15.0, 15.0, 0.1, 50.0);
let light_vp = light_proj * light_view;
let models = object_models();
let materials = object_materials();
let cam_aligned = state.cam_aligned_size as usize;
let mat_aligned = state.mat_aligned_size as usize;
let sp_aligned = state.shadow_pass_aligned_size as usize;
// ----- Build shadow pass staging data -----
let sp_total = sp_aligned * NUM_OBJECTS;
let mut sp_staging = vec![0u8; sp_total];
for i in 0..NUM_OBJECTS {
let sp_uniform = ShadowPassUniform {
light_vp_model: (light_vp * models[i]).cols,
};
let bytes = bytemuck::bytes_of(&sp_uniform);
let offset = i * sp_aligned;
sp_staging[offset..offset + bytes.len()].copy_from_slice(bytes);
}
state.gpu.queue.write_buffer(&state.shadow_pass_buffer, 0, &sp_staging);
// ----- Build color pass staging data -----
let view_proj = state.camera.view_projection();
let cam_pos = [
state.camera.position.x,
state.camera.position.y,
state.camera.position.z,
];
let cam_total = cam_aligned * NUM_OBJECTS;
let mat_total = mat_aligned * NUM_OBJECTS;
let mut cam_staging = vec![0u8; cam_total];
let mut mat_staging = vec![0u8; mat_total];
for i in 0..NUM_OBJECTS {
let cam_uniform = CameraUniform {
view_proj: view_proj.cols,
model: models[i].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 (color, metallic, roughness) = materials[i];
let mat_uniform = MaterialUniform::with_params(color, metallic, roughness);
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 shadow uniform with light VP
let shadow_uniform = ShadowUniform {
light_view_proj: light_vp.cols,
shadow_map_size: SHADOW_MAP_SIZE as f32,
shadow_bias: 0.005,
_padding: [0.0; 2],
};
state.gpu.queue.write_buffer(
&state.shadow_uniform_buffer,
0,
bytemuck::cast_slice(&[shadow_uniform]),
);
// Write light uniform
let mut lights_uniform = LightsUniform::new();
lights_uniform.ambient_color = [0.05, 0.05, 0.05];
lights_uniform.add_light(LightData::directional(
[-1.0, -2.0, -1.0],
[1.0, 1.0, 1.0],
2.0,
));
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 color_view = output.texture.create_view(&wgpu::TextureViewDescriptor::default());
let mut encoder = state.gpu.device.create_command_encoder(
&wgpu::CommandEncoderDescriptor { label: Some("Shadow Demo Encoder") },
);
// ===== Pass 1: Shadow =====
{
let mut shadow_pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
label: Some("Shadow Pass"),
color_attachments: &[],
depth_stencil_attachment: Some(wgpu::RenderPassDepthStencilAttachment {
view: &state.shadow_map.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,
});
shadow_pass.set_pipeline(&state.shadow_pipeline);
for i in 0..NUM_OBJECTS {
let offset = (i as u32) * state.shadow_pass_aligned_size;
shadow_pass.set_bind_group(0, &state.shadow_pass_bind_group, &[offset]);
if is_cube(i) {
shadow_pass.set_vertex_buffer(0, state.cube_mesh.vertex_buffer.slice(..));
shadow_pass.set_index_buffer(state.cube_mesh.index_buffer.slice(..), wgpu::IndexFormat::Uint32);
shadow_pass.draw_indexed(0..state.cube_mesh.num_indices, 0, 0..1);
} else {
shadow_pass.set_vertex_buffer(0, state.sphere_mesh.vertex_buffer.slice(..));
shadow_pass.set_index_buffer(state.sphere_mesh.index_buffer.slice(..), wgpu::IndexFormat::Uint32);
shadow_pass.draw_indexed(0..state.sphere_mesh.num_indices, 0, 0..1);
}
}
}
// ===== Pass 2: Color (PBR) =====
{
let mut render_pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
label: Some("Color Pass"),
color_attachments: &[Some(wgpu::RenderPassColorAttachment {
view: &color_view,
resolve_target: None,
depth_slice: None,
ops: wgpu::Operations {
load: wgpu::LoadOp::Clear(wgpu::Color {
r: 0.1, g: 0.1, b: 0.15, 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.pbr_pipeline);
render_pass.set_bind_group(1, &state._texture.bind_group, &[]);
render_pass.set_bind_group(3, &state.shadow_bind_group, &[]);
for i in 0..NUM_OBJECTS {
let cam_offset = (i as u32) * state.cam_aligned_size;
let mat_offset = (i as u32) * 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]);
if is_cube(i) {
render_pass.set_vertex_buffer(0, state.cube_mesh.vertex_buffer.slice(..));
render_pass.set_index_buffer(state.cube_mesh.index_buffer.slice(..), wgpu::IndexFormat::Uint32);
render_pass.draw_indexed(0..state.cube_mesh.num_indices, 0, 0..1);
} else {
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);
render_pass.draw_indexed(0..state.sphere_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 = ShadowDemoApp { state: None };
event_loop.run_app(&mut app).unwrap();
}