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feat(renderer): improve IBL with Hosek-Wilkie sky, SH irradiance, GPU BRDF LUT

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- Hosek-Wilkie inspired procedural sky (Rayleigh/Mie scattering, sun disk)
- L2 Spherical Harmonics irradiance (9 coefficients, CPU computation)
- SH evaluation in shader replaces sample_environment for diffuse IBL
- GPU compute BRDF LUT (Rg16Float, higher precision than CPU Rgba8Unorm)
- SkyParams (sun_direction, turbidity) in ShadowUniform

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
tolelom
2026-03-25 20:58:28 +09:00
parent abd6f5cf6e
commit 1081fb472f
13 changed files with 693 additions and 10 deletions
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3
examples/deferred_demo/src/main.rs
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@@ -417,6 +417,9 @@ impl ApplicationHandler for DeferredDemoApp {
shadow_map_size: 0.0,
shadow_bias: 0.0,
_padding: [0.0; 2],
sun_direction: [0.5, -0.7, 0.5],
turbidity: 3.0,
sh_coefficients: [[0.0; 4]; 7],
};
let shadow_uniform_buffer = gpu.device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
label: Some("Shadow Uniform Buffer"),

3
examples/ibl_demo/src/main.rs
View File

@@ -211,6 +211,9 @@ impl ApplicationHandler for IblDemoApp {
shadow_map_size: 0.0,
shadow_bias: 0.0,
_padding: [0.0; 2],
sun_direction: [0.5, -0.7, 0.5],
turbidity: 3.0,
sh_coefficients: [[0.0; 4]; 7],
};
let shadow_uniform_buffer = gpu.device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
label: Some("Shadow Uniform Buffer"),

3
examples/multi_light_demo/src/main.rs
View File

@@ -222,6 +222,9 @@ impl ApplicationHandler for MultiLightApp {
shadow_map_size: 0.0,
shadow_bias: 0.0,
_padding: [0.0; 2],
sun_direction: [0.5, -0.7, 0.5],
turbidity: 3.0,
sh_coefficients: [[0.0; 4]; 7],
};
let shadow_uniform_buffer = gpu.device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
label: Some("Shadow Uniform Buffer"),

3
examples/pbr_demo/src/main.rs
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@@ -207,6 +207,9 @@ impl ApplicationHandler for PbrDemoApp {
shadow_map_size: 0.0,
shadow_bias: 0.0,
_padding: [0.0; 2],
sun_direction: [0.5, -0.7, 0.5],
turbidity: 3.0,
sh_coefficients: [[0.0; 4]; 7],
};
let shadow_uniform_buffer = gpu.device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
label: Some("Shadow Uniform Buffer"),

6
examples/shadow_demo/src/main.rs
View File

@@ -258,6 +258,9 @@ impl ApplicationHandler for ShadowDemoApp {
shadow_map_size: SHADOW_MAP_SIZE as f32,
shadow_bias: 0.005,
_padding: [0.0; 2],
sun_direction: [0.5, -0.7, 0.5],
turbidity: 3.0,
sh_coefficients: [[0.0; 4]; 7],
};
let shadow_uniform_buffer = gpu.device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
label: Some("Shadow Uniform Buffer"),
@@ -483,6 +486,9 @@ impl ApplicationHandler for ShadowDemoApp {
shadow_map_size: SHADOW_MAP_SIZE as f32,
shadow_bias: 0.005,
_padding: [0.0; 2],
sun_direction: [0.5, -0.7, 0.5],
turbidity: 3.0,
sh_coefficients: [[0.0; 4]; 7],
};
state.gpu.queue.write_buffer(
&state.shadow_uniform_buffer,

6
examples/survivor_game/src/main.rs
View File

@@ -267,6 +267,9 @@ impl ApplicationHandler for SurvivorApp {
shadow_map_size: SHADOW_MAP_SIZE as f32,
shadow_bias: 0.005,
_padding: [0.0; 2],
sun_direction: [0.5, -0.7, 0.5],
turbidity: 3.0,
sh_coefficients: [[0.0; 4]; 7],
};
let shadow_uniform_buffer =
gpu.device
@@ -595,6 +598,9 @@ impl ApplicationHandler for SurvivorApp {
shadow_map_size: SHADOW_MAP_SIZE as f32,
shadow_bias: 0.005,
_padding: [0.0; 2],
sun_direction: [0.5, -0.7, 0.5],
turbidity: 3.0,
sh_coefficients: [[0.0; 4]; 7],
};
state.gpu.queue.write_buffer(
&state.shadow_uniform_buffer,