Catcrafts/Crafter.Graphics
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feat(webgpu-rt): add intersection stage, procedural hit group, AABB BLAS API

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Extends the cross-backend RT type surface for procedural geometry +
any-hit on the WebGPU path:

- RTShaderGroupType::ProceduralHitGroup + RTShaderGroup::intersectionShader
  (mirror VK_RAY_TRACING_SHADER_GROUP_TYPE_PROCEDURAL_HIT_GROUP_KHR).
- WebGPURTStage::Intersection for AABB intersection shaders.
- Mesh::BuildProcedural(span<RTAabb>, opaque) — the WebGPU analog of a
  VK_GEOMETRY_TYPE_AABBS_KHR geometry.
- wgpuRegisterMeshBLAS gains geomType / opaqueFlag / primCount.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
catbot 2026-06-02 22:09:14 +00:00
commit 321fe596a7
4 changed files with 66 additions and 15 deletions
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27
interfaces/Crafter.Graphics-RT.cppm
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@ -60,24 +60,33 @@ export namespace Crafter {
inline constexpr std::uint8_t kRTGeometryInstanceForceOpaque = 0x4;
inline constexpr std::uint8_t kRTGeometryInstanceForceNoOpaque = 0x8;
// Hit-group identification. Matches VkRayTracingShaderGroupTypeKHR for
// the two types we actually support (general + triangles-hit).
// Hit-group identification. Matches VkRayTracingShaderGroupTypeKHR.
// General — raygen / miss / callable
// TrianglesHitGroup — closest-hit/any-hit over triangle geometry
// ProceduralHitGroup — closest-hit/any-hit + an intersection shader
// over AABB (VK_GEOMETRY_TYPE_AABBS_KHR) geometry
enum class RTShaderGroupType : std::uint8_t {
General = 0, // raygen / miss / callable
TrianglesHitGroup = 1,
General = 0, // raygen / miss / callable
TrianglesHitGroup = 1,
ProceduralHitGroup = 2,
};
// Cross-backend description of one entry in the shader-group array
// passed to PipelineRT::Init. Mirrors the meaningful subset of
// VkRayTracingShaderGroupCreateInfoKHR: per group, the type and the
// indices (into the SBT's shader array) for general / closestHit /
// anyHit, with kRTShaderUnused == VK_SHADER_UNUSED_KHR for "none".
// anyHit / intersection, with kRTShaderUnused == VK_SHADER_UNUSED_KHR
// for "none". `intersectionShader` is only consulted for
// ProceduralHitGroup; it names the shader run for each AABB the ray
// enters (the analog of VkRayTracingShaderGroupCreateInfoKHR::
// intersectionShader).
inline constexpr std::uint32_t kRTShaderUnused = 0xFFFFFFFFu;
struct RTShaderGroup {
RTShaderGroupType type = RTShaderGroupType::General;
std::uint32_t generalShader = kRTShaderUnused;
std::uint32_t closestHitShader = kRTShaderUnused;
std::uint32_t anyHitShader = kRTShaderUnused;
RTShaderGroupType type = RTShaderGroupType::General;
std::uint32_t generalShader = kRTShaderUnused;
std::uint32_t closestHitShader = kRTShaderUnused;
std::uint32_t anyHitShader = kRTShaderUnused;
std::uint32_t intersectionShader = kRTShaderUnused;
};
}