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refactor(render): cull terrain by walk in-view cells

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Erik 2026-08-31 04:54:03 +02:00
parent 98d2d43fdc
commit 837a33baff
3 changed files with 54 additions and 14 deletions
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47
src/AcDream.App/Rendering/TerrainModernRenderer.cs
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@ -68,6 +68,7 @@ public sealed partial class TerrainModernRenderer : IDisposable
// Reusable per-frame buffers.
private readonly List<int> _visibleSlots = new();
private readonly HashSet<uint> _visibleCellIds = new();
private readonly HashSet<uint> _walkVisibleLandblocks = new();
private DrawElementsIndirectCommand[] _deicScratch = Array.Empty<DrawElementsIndirectCommand>();
// Diag.
@ -204,34 +205,58 @@ public sealed partial class TerrainModernRenderer : IDisposable
FrustumPlanes? frustum = null,
uint? neverCullLandblockId = null,
ReadOnlySpan<Vector4> clipPlanes = default,
Vector4? ndcClipAabb = null)
Vector4? ndcClipAabb = null,
IReadOnlySet<uint>? inViewLandcells = null)
{
if (_alloc.LoadedCount == 0) return;
Matrix4x4 viewProjection = camera.View * camera.Projection;
// Campaign FW4: RetailFrameWalk is the sole visibility authority.
// Terrain remains one full-landblock MDI draw, but only landblocks
// containing a walk-admitted landcell participate, and the published
// landcell set is the walk's exact in_view set rather than a second
// frustum-derived approximation.
_walkVisibleLandblocks.Clear();
if (inViewLandcells is not null)
{
foreach (uint cellId in inViewLandcells)
{
_walkVisibleLandblocks.Add(cellId & 0xFFFF0000u);
_visibleCellIds.Add(cellId);
}
}
// Build visible slot list with per-slot frustum cull.
_visibleSlots.Clear();
for (int slot = 0; slot < _slots.Length; slot++)
{
var data = _slots[slot];
if (data is null) continue;
if (inViewLandcells is not null
&& !_walkVisibleLandblocks.Contains(data.LandblockId & 0xFFFF0000u))
{
continue;
}
if (frustum is not null && data.LandblockId != neverCullLandblockId)
{
if (!FrustumCuller.IsAabbVisible(frustum.Value, data.AabbMin, data.AabbMax))
continue;
}
_visibleSlots.Add(slot);
CollectVisibleCells(
_visibleCellIds,
data.LandblockId,
data.WorldOrigin,
data.AabbMin.Z,
data.AabbMax.Z,
frustum,
viewProjection,
clipPlanes,
ndcClipAabb);
if (inViewLandcells is null)
{
CollectVisibleCells(
_visibleCellIds,
data.LandblockId,
data.WorldOrigin,
data.AabbMin.Z,
data.AabbMax.Z,
frustum,
viewProjection,
clipPlanes,
ndcClipAabb);
}
}
if (_visibleSlots.Count == 0) return;