Catcrafts/Crafter.Graphics
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test+usage: device-local geometry readback + isolate #67 staging count

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- Add TRANSFER_SRC to RT geometry usage so device-local geometry (now in
  VRAM, no longer host-mappable) stays copyable/inspectable.
- MeshDecompressStagingRelease: read decompressed vertex/index back via a
  device->host copy instead of the removed host-mapped .value/FlushHost, and
  build the mesh with allowUpdate=true so the retained per-mesh scratch (#66)
  doesn't also land in the deletion queue — isolating the assertion to the
  released compressed staging (#67).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
catbot 2026-06-17 18:05:13 +00:00
commit ed9b3f67a7
2 changed files with 41 additions and 10 deletions
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10
implementations/Crafter.Graphics-Mesh.cpp
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@ -32,10 +32,16 @@ using namespace Crafter;
namespace {
// Buffer-usage flag set shared by both Build paths. The compressed path
// appends VK_BUFFER_USAGE_2_MEMORY_DECOMPRESSION_BIT_EXT.
// appends VK_BUFFER_USAGE_2_MEMORY_DECOMPRESSION_BIT_EXT, and the staged
// upload path appends VK_BUFFER_USAGE_TRANSFER_DST_BIT. TRANSFER_SRC is in
// the base because the geometry is now device-local (#73): once it no longer
// lives in host-mappable memory, a transfer copy is the only way to read it
// back (debugging, GPU-driven workflows, decompression validation) — a free
// usage flag that keeps device-local geometry inspectable.
constexpr VkBufferUsageFlags2 kVertexUsageBase =
VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT
| VK_BUFFER_USAGE_2_ACCELERATION_STRUCTURE_BUILD_INPUT_READ_ONLY_BIT_KHR;
| VK_BUFFER_USAGE_2_ACCELERATION_STRUCTURE_BUILD_INPUT_READ_ONLY_BIT_KHR
| VK_BUFFER_USAGE_TRANSFER_SRC_BIT;
constexpr VkBufferUsageFlags2 kIndexUsageBase =
kVertexUsageBase | VK_BUFFER_USAGE_STORAGE_BUFFER_BIT;