Integrate BLAS/TLAS acceleration structures and RT shadow compute pass
into the deferred rendering demo. Adds GpuContext::new_with_features()
for requesting EXPERIMENTAL_RAY_QUERY, Mesh::new_with_usage() for
BLAS_INPUT buffer flags, and extends the lighting shadow bind group
to 9 entries (shadow map + IBL + SSGI + RT shadow).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Adds t_ssgi/s_ssgi bindings (group 2, bindings 5-6) to
lighting_shadow_bind_group_layout and deferred_lighting.wgsl. Replaces the
simple ambient term with SSGI-modulated ambient: ao*ssgi_ao applied to IBL
diffuse+specular, plus ssgi_indirect for indirect color bleeding.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Adds ssgi_shader.wgsl (fullscreen pass: view-space TBN from noise, 64-sample
hemisphere loop with occlusion + color bleeding, outputs vec4(ao, indirect_rgb)).
Adds ssgi_gbuffer_bind_group_layout, ssgi_data_bind_group_layout, and
create_ssgi_pipeline to deferred_pipeline.rs. Exports all three from lib.rs.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Implements deferred_lighting.wgsl for the fullscreen lighting pass:
reads G-Buffer textures, runs the identical Cook-Torrance BRDF functions
(distribution_ggx, geometry_smith, fresnel_schlick, attenuation, etc.)
from pbr_shader.wgsl, computes multi-light contribution with PCF shadow
and IBL, then applies Reinhard tonemapping and gamma correction.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Implements deferred_gbuffer.wgsl for the geometry pass: samples albedo
and normal map textures, applies TBN normal mapping, and writes world
position, encoded normal, albedo, and material parameters (metallic/
roughness/ao) to 4 separate G-Buffer render targets.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Introduces GBuffer struct with 4 render target TextureViews (position/
normal/albedo/material) plus depth, and a fullscreen oversized triangle
for screen-space passes. Exports format constants and create helpers.
Updates lib.rs with new module declarations and re-exports.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
wgpu's default max_bind_groups is 4 (groups 0-3), but the PBR shader was
using group(4) for BRDF LUT bindings. This merges IBL bindings into the
shadow bind group (group 3) at binding slots 3-4, removes the standalone
IBL bind group layout/creation, and updates all examples accordingly.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Implements CPU-based BRDF LUT generation using the split-sum IBL
approximation (Hammersley sampling, GGX importance sampling, Smith
geometry with IBL k=a²/2). Wraps the 256×256 Rgba8Unorm LUT in
IblResources for GPU upload via wgpu 28.0 API.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
WGSL vec3<f32> requires 16-byte alignment, causing the shader to expect
1056 bytes while Rust struct was 1040. Added padding fields to match.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Implements parse_bmp (24/32-bit uncompressed BMP to RGBA), GpuTexture with
wgpu 28.0 write_texture API (TexelCopyTextureInfo/TexelCopyBufferLayout),
bind_group_layout, white_1x1 fallback, and 3 BMP parser unit tests.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
