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wip(assembler): round L2 -- the cross-platform hash check can fail; FP contraction changes the world

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Clang -ffp-contract=on/fast and GCC's default (fast) all change the density hash on the L1 view;
contraction off reproduces L1 (= Windows S13) at W1/W12. Seed sweep: 48 FloatingIslands seeds and
14 effective SurfaceWorld seeds (34 of 48 fell on a seed-independent cube) match across Clang/GCC
and W1/W12. Standalone gains --seed/--recipe/--render-distance-chunks (viewer + headless) and a
Windows replay script. Linux standalone workers get 32 MiB pthread stacks (TLS is 17.3 MiB/thread),
so no external stack limit is needed. No Core or world-output change; MSVC compile unverified.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Fr0zkaandClaude Opus 5.5 committed 2026-10-19 18:18:34 +02:00
1 parent 1276fd11e3
commit 303b7b9f24
17 files changed
+1401 -13
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Standalone/Source/StreamBenchmarkPipeline.h
+22
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@@ -78,6 +78,28 @@ namespace StandaloneStreamBenchmark
if(MaxLevel>=0)
Desired.Tiles.erase(std::remove_if(Desired.Tiles.begin(),Desired.Tiles.end(),
[&](const FVoxelTileKey& Tile){return Tile.Level>MaxLevel;}),Desired.Tiles.end());
if(!Desired.Tiles.empty())
{
FIntVector volumeMin(INT32_MAX,INT32_MAX,INT32_MAX);
FIntVector volumeMax(INT32_MIN,INT32_MIN,INT32_MIN);
int32 minimumLod=INT32_MAX,maximumLod=INT32_MIN;
for(const FVoxelTileKey& tile:Desired.Tiles)
{
const FIntVector origin=tile.OriginVoxels();
const int32 extent=tile.ExtentVoxels();
volumeMin.X=std::min(volumeMin.X,origin.X);
volumeMin.Y=std::min(volumeMin.Y,origin.Y);
volumeMin.Z=std::min(volumeMin.Z,origin.Z);
volumeMax.X=std::max(volumeMax.X,origin.X+extent);
volumeMax.Y=std::max(volumeMax.Y,origin.Y+extent);
volumeMax.Z=std::max(volumeMax.Z,origin.Z+extent);
minimumLod=std::min(minimumLod,tile.Level);
maximumLod=std::max(maximumLod,tile.Level);
}
std::printf("[PipelineVolume] tiles=%zu lod=%d..%d min_voxel=(%d,%d,%d) max_voxel=(%d,%d,%d)\n",
Desired.Tiles.size(),minimumLod,maximumLod,volumeMin.X,volumeMin.Y,volumeMin.Z,
volumeMax.X,volumeMax.Y,volumeMax.Z);
}
FIntVector FineMin(INT32_MAX,INT32_MAX,INT32_MAX),FineMax(INT32_MIN,INT32_MIN,INT32_MIN);
FIntVector ClipMin(INT32_MAX,INT32_MAX,INT32_MAX),ClipMax(INT32_MIN,INT32_MIN,INT32_MIN);
for(const FVoxelTileKey& Tile:Desired.Tiles)