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feat(webgpu): HDR post-process primitives — float textures, storage-texture bindings, RESOLVE→HDR target (#27)

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Adds the minimal WebGPU-backend surface an HDR bloom/post chain needs:

1. wgpuCreateStorageImage2D + StorageImage2D<>: runtime rgba16float (or
   other format) textures with STORAGE_BINDING|TEXTURE_BINDING usage, no
   CompressedTextureAsset upload — GPU-produced HDR targets.
2. UICustomBindingKind::StorageTexture (kind 5): write-only storage-texture
   binding carrying a texel format (the freed UICustomBinding::format byte),
   wired through all three binding paths (UI custom / RT / plain compute).
   Float textures already sample via SampledTexture (sampleType float).
3. PipelineRTWebGPU::Init(..., hdrOutputFormat): RESOLVE writes the linear
   accumulator into a user rgba16float texture (RTPass::outTexHandle)
   instead of the rgba8unorm canvas, leaving the composite→swapchain pass to
   the app. Default RGBA8Unorm keeps the canvas path byte-identical.

Existing RT examples updated for the _pad→format field rename; the default
paths are unchanged (verified RTStress builds + renders).

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 097cc37347
12 changed files with 198 additions and 22 deletions
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7
implementations/Crafter.Graphics-PipelineRTWebGPU.cpp
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@ -80,8 +80,10 @@ void PipelineRTWebGPU::Init(WebGPUCommandEncoderRef /*cmd*/,
std::span<const RTShaderGroup> missGroups,
std::span<const RTShaderGroup> hitGroups,
const ShaderBindingTableWebGPU& sbt,
std::span<const UICustomBinding> bindings) {
std::span<const UICustomBinding> bindings,
WebGPUTexelFormat hdrOutputFormat) {
userBindings.assign(bindings.begin(), bindings.end());
hdrOutput = (hdrOutputFormat != WebGPUTexelFormat::RGBA8Unorm);
std::string wgsl;
wgsl.reserve(8 * 1024);
@ -306,5 +308,6 @@ void PipelineRTWebGPU::Init(WebGPUCommandEncoderRef /*cmd*/,
wgsl.data(),
static_cast<std::int32_t>(wgsl.size()),
userBindings.empty() ? nullptr : userBindings.data(),
static_cast<std::int32_t>(userBindings.size()));
static_cast<std::int32_t>(userBindings.size()),
static_cast<std::int32_t>(hdrOutputFormat));
}