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feat(app): Phase A.2 — wire frustum culling into terrain + static-mesh renderers

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Per-landblock AABB culling against the view frustum. Each loaded
landblock has a 192×192 XY footprint + a Z range derived from the
terrain vertex min/max (padded +50 above / -10 below for entities
on top and basements). One AABB test per landblock per frame;
landblocks fully outside the frustum skip ALL their terrain draws
and entity draws (both opaque and translucent passes).

GpuWorldState gains SetLandblockAabb + LandblockEntries (per-landblock
iteration with AABB data). TerrainRenderer.Draw and
StaticMeshRenderer.Draw both accept an optional FrustumPlanes and
skip culled landblocks. GameWindow.OnRender extracts FrustumPlanes
from camera.View * camera.Projection and passes to both.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erik 2026-04-12 08:53:18 +02:00
parent 07fde88534
commit 3c9fc63af7
4 changed files with 156 additions and 64 deletions
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28
src/AcDream.App/Rendering/GameWindow.cs
View file

@ -1189,6 +1189,28 @@ public sealed class GameWindow : IDisposable
lb.Heightmap, lbXu, lbYu, _heightTable, _blendCtx, _surfaceCache);
_terrain.AddLandblock(lb.LandblockId, meshData, origin);
// Compute the per-landblock AABB for frustum culling. XY from the
// landblock's world origin + 192 footprint. Z from the terrain vertex
// range padded +50 above (for trees/buildings) and -10 below (for
// basements). TerrainRenderer already scans vertices internally; we
// replicate here so GpuWorldState has the same bounds for the static
// mesh renderer's culling pass.
{
float zMin = float.MaxValue, zMax = float.MinValue;
foreach (var v in meshData.Vertices)
{
float z = v.Position.Z;
if (z < zMin) zMin = z;
if (z > zMax) zMax = z;
}
if (zMin == float.MaxValue) { zMin = 0f; zMax = 0f; }
zMax += 50f; // generous pad for trees and buildings
zMin -= 10f; // below-ground buffer for basements/cellars
var aabbMin = new System.Numerics.Vector3(origin.X, origin.Y, zMin);
var aabbMax = new System.Numerics.Vector3(origin.X + 192f, origin.Y + 192f, zMax);
_worldState.SetLandblockAabb(lb.LandblockId, aabbMin, aabbMax);
}
// Upload every GfxObj referenced by this landblock's entities.
// EnsureUploaded is idempotent so duplicates across landblocks are free.
if (_staticMesh is not null)
@ -1320,8 +1342,10 @@ public sealed class GameWindow : IDisposable
if (_cameraController is not null)
{
_terrain?.Draw(_cameraController.Active);
_staticMesh?.Draw(_cameraController.Active, _worldState.Entities);
var camera = _cameraController.Active;
var frustum = AcDream.App.Rendering.FrustumPlanes.FromViewProjection(camera.View * camera.Projection);
_terrain?.Draw(camera, frustum);
_staticMesh?.Draw(camera, _worldState.LandblockEntries, frustum);
}
}