# VulkanTriangle

The minimal ray-traced example. Renders a single static triangle through
`vkCmdTraceRaysKHR`. No UI.

## What it shows

- `Device::Initialize()` + `Window` + swapchain bring-up.
- A `DescriptorHeapVulkan` sized for one image + one buffer slot, with
  slot ranges allocated via the bump-allocator API
  (`AllocateImageSlots`, `AllocateBufferSlots`).
- A `PipelineRTVulkan` built from raygen / miss / closesthit SPIR-V
  shaders compiled at build time.
- `Mesh::Build` constructing a BLAS and `RenderingElement3D::BuildTLAS`
  the per-frame TLAS.
- Direct descriptor writes via `vkWriteResourceDescriptorsEXT` for the
  swapchain views and TLAS device addresses.
- `RTPass{&pipeline}` plugged into `window.passes` — the canonical
  way to add ray tracing to a window in this library.

It's the smallest sensible test of the bindless `VK_EXT_descriptor_heap`
+ ray-tracing path.

## Run

```bash
cd examples/VulkanTriangle
crafter-build -r
```

You should see a 1280×720 window with a triangle filling roughly the
centre.

## Notes

`raygen.glsl`'s `traceRayEXT` call is currently commented out — the
example exercises the dispatch and `imageStore` paths only. Uncomment
it to actually trace into the BLAS.