Catcrafts/Crafter.Graphics
2
0
Fork 0
Code Issues 1 Pull requests Projects Releases Packages Wiki Activity Actions

test(webgpu): HDRBloom example exercising the HDR post-process primitives (#27)

Browse source 
RT→rgba16float→threshold→blur→composite, end-to-end proof of the three
primitives. threshold/blur run from onBeforeUpdate (one submit each) so the
storage-write→sampled-read dependency gets WebGPU's per-submit barrier
(there is none between dispatches within a compute pass); the composite is a
UI custom shader so it owns the canvas ping-pong. Documents the Vulkan
symmetry (gap 4): the native present path records passes generically and
barriers between them, so the same chain is wireable today.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
catbot 2026-06-09 12:55:14 +00:00
commit bbe1b21c22
10 changed files with 518 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

16
examples/README.md
View file

@ -90,3 +90,19 @@ Regression test for the WebGPU software ray-query shim. Builds a
checking it against the analytically-known answer. Guards against the
hardcoded-leaf-start TLAS-traversal bug (issue #25) that made every
rayQuery pick miss for realistic instance counts. WebGPU/DOM only.
### [HDRBloom](HDRBloom/)
Cross-backend-shaped HDR bloom on the WebGPU backend (issue #27). The RT
pipeline's RESOLVE writes linear radiance into a user `rgba16float`
texture (`StorageImage2D`, `PipelineRTWebGPU::Init(..., RGBA16Float)`),
two `PlainComputeShader` passes threshold + blur it through float storage
targets (`UICustomBindingKind::StorageTexture`), and a UI custom shader
composites scene + bloom with a Reinhard tonemap onto the canvas.
Exercises the three primitives an HDR post-process chain needs: float
textures, write-only storage-texture bindings, and pre-tonemap radiance
out of the wavefront. The threshold/blur passes run from `onBeforeUpdate`
so each gets its own queue submit — the storage-write → sampled-read
barrier WebGPU only provides between submits (or between passes), never
within a single compute pass. WebGPU/DOM only; the same chain is wireable
on Vulkan today via an offscreen HDR heap image + a composite `RenderPass`
(the present path records passes generically and barriers between them).