Regression test for the procedural BLAS path: the same 3x3x3 grid of
unit-box AABBs runs through a PROCEDURAL_HIT_GROUP_KHR group whose GLSL
intersection shader (reportIntersectionEXT) turns each box into a
radius-1 sphere, the any-hit shader punches the spherical-checkerboard
cut-out (visible proof non-opaque geometry runs any-hit), and the
closest-hit shades per-instance tints — the WebGPU example behavior
reproduced natively. Fixed camera in raygen.glsl; the WebGPU/DOM path is
unchanged.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Adds the native counterpart of the WebGPU Mesh::BuildProcedural: uploads
the boxes as a 24-byte-stride VkAabbPositionsKHR-compatible device buffer
(AS-build-input read-only + device address) and builds the BLAS from one
VK_GEOMETRY_TYPE_AABBS_KHR geometry. opaque maps to
VK_GEOMETRY_OPAQUE_BIT_KHR, default-false semantics matching the WebGPU
path so any-hit shaders run. The BLAS sizing/create/build tail is factored
into a geometry-type-agnostic helper shared with the triangle path; no
TLAS/instance changes needed.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
