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

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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>
This commit is contained in:
tolelom
2026-03-24 20:55:24 +09:00
parent b0934970b9
commit fdfe4aaf5f
4 changed files with 586 additions and 16 deletions
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24
examples/pbr_demo/src/main.rs
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@@ -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
let light_uniform = LightUniform {
direction: [-1.0, -1.0, -1.0],
_padding1: 0.0,
color: [1.0, 1.0, 1.0],
ambient_strength: 0.1,
};
// Light: direction [-1, -1, -1], color white, intensity 1.0
let mut lights_uniform = LightsUniform::new();
lights_uniform.add_light(LightData::directional([-1.0, -1.0, -1.0], [1.0, 1.0, 1.0], 1.0));
// 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 {
direction: [-1.0, -1.0, -1.0],
_padding1: 0.0,
color: [1.0, 1.0, 1.0],
ambient_strength: 0.1,
};
let mut lights_uniform = LightsUniform::new();
lights_uniform.add_light(LightData::directional([-1.0, -1.0, -1.0], [1.0, 1.0, 1.0], 1.0));
state.gpu.queue.write_buffer(
&state.light_buffer,
0,
bytemuck::cast_slice(&[light_uniform]),
bytemuck::cast_slice(&[lights_uniform]),
);
// Render