362 lines
16 KiB
C#
362 lines
16 KiB
C#
using System;
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using System.Numerics;
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using AcDream.App.Input;
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using AcDream.Core.Physics;
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using Xunit;
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namespace AcDream.Core.Tests.Input;
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public class PlayerMovementControllerTests
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{
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private static PhysicsEngine MakeFlatEngine()
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{
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var engine = new PhysicsEngine();
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var heights = new byte[81];
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Array.Fill(heights, (byte)50);
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var heightTable = new float[256];
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for (int i = 0; i < 256; i++) heightTable[i] = i * 1f;
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var terrain = new TerrainSurface(heights, heightTable);
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engine.AddLandblock(0xA9B4FFFFu, terrain, Array.Empty<CellSurface>(),
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Array.Empty<PortalPlane>(), worldOffsetX: 0f, worldOffsetY: 0f);
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return engine;
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}
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[Fact]
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public void Update_NoInput_PositionUnchanged()
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{
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var engine = MakeFlatEngine();
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var controller = new PlayerMovementController(engine);
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controller.SetPosition(new Vector3(96f, 96f, 50f), 0x0001);
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var result = controller.Update(0.016f, new MovementInput());
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Assert.Equal(96f, result.Position.X, precision: 1);
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Assert.Equal(96f, result.Position.Y, precision: 1);
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}
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// ── Indoor-flap root cause: resting-body bit-stability ────────────────────
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//
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// The indoor render "flap" (textures battling at the cottage doorway) is
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// portal-flood membership instability. PortalVisibilityBuilder.Build is a
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// proven-deterministic pure function, so the membership can only flip if its
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// INPUT (the camera eye, derived from the player RenderPosition) varies.
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// Live 6-dp capture (pvinput.log:54) shows the player RenderPosition carries
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// a perpetual ~1-ULP flicker at rest (Z 94.000000 <-> 93.999992 — exactly one
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// float mantissa step). ComputeRenderPosition is Vector3.Lerp(_prevPhysicsPos,
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// _currPhysicsPos, alpha), and Lerp(a, a, t) == a exactly, so a jittering
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// RenderPosition at rest means the physics body's resting Position is NOT
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// bit-stable between ticks. Retail's authoritative local position is bit-stable
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// at rest (validate_transition -> kill_velocity on every grounded contact), so
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// retail never flaps.
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//
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// This test pins the physics-side invariant: a grounded body with no input
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// must hold a byte-identical position across many frames. It PASSES — which
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// is itself the evidence: the physics resting position is bit-stable, so the
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// doorway flap is NOT a physics-rest jitter. See
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// docs/research/2026-06-08-flap-physics-diagnosis-REFUTED-its-render-membership.md
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// (the flap is render-side portal-flood membership instability at the grazing
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// doorway portal under a sweeping camera eye). Kept as a regression guard.
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[Fact]
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public void Update_AtRestNoInput_RenderPositionBitStableAcrossManyFrames()
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{
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var engine = MakeFlatEngine();
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var controller = new PlayerMovementController(engine);
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var rest = new Vector3(96f, 96f, 50f);
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controller.SetPosition(rest, 0x0001);
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// Settle one frame so the resolver establishes its rest state, then
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// capture the baseline the body must hold.
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var settled = controller.Update(1f / 60f, new MovementInput());
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Vector3 baselineRender = settled.RenderPosition;
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Vector3 baselinePhysics = settled.Position;
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// Hold still for ~10 s of 60 Hz frames (crosses MinQuantum every ~2
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// frames, so the 30 Hz physics tick fires throughout — same cadence as
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// live). Any deviation, even one ULP, is the flap's root cause.
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float maxRenderDev = 0f;
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float maxPhysicsDev = 0f;
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for (int i = 0; i < 600; i++)
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{
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var r = controller.Update(1f / 60f, new MovementInput());
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maxRenderDev = MathF.Max(maxRenderDev, (r.RenderPosition - baselineRender).Length());
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maxPhysicsDev = MathF.Max(maxPhysicsDev, (r.Position - baselinePhysics).Length());
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}
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Assert.True(
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maxRenderDev == 0f && maxPhysicsDev == 0f,
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$"resting body drifted: render={maxRenderDev * 1e6f:F3} µm, " +
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$"physics={maxPhysicsDev * 1e6f:F3} µm; expected byte-identical rest");
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}
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// After walking then releasing input, the body must SETTLE to a
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// byte-identical resting position — not keep blipping a residual velocity.
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// This models the live flap: the player walks to the cottage doorway and
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// stops, and the eye then carries a ~1-ULP jitter that flips portal-flood
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// membership. Flat-terrain variant: if even this drifts, the residual-after-
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// motion path is the root and it is not indoor-specific.
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[Fact]
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public void Update_WalkThenStop_SettlesToBitStableRest()
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{
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var engine = MakeFlatEngine();
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var controller = new PlayerMovementController(engine);
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controller.SetPosition(new Vector3(96f, 96f, 50f), 0x0001);
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controller.Yaw = 0f;
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// Walk forward ~0.5 s, then release.
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for (int i = 0; i < 30; i++)
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controller.Update(1f / 60f, new MovementInput(Forward: true));
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// Let velocity decay / state settle.
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for (int i = 0; i < 30; i++)
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controller.Update(1f / 60f, new MovementInput());
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var settled = controller.Update(1f / 60f, new MovementInput());
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Vector3 basePos = settled.Position;
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Vector3 baseRender = settled.RenderPosition;
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float maxPos = 0f, maxRender = 0f;
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for (int i = 0; i < 600; i++)
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{
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var r = controller.Update(1f / 60f, new MovementInput());
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maxPos = MathF.Max(maxPos, (r.Position - basePos).Length());
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maxRender = MathF.Max(maxRender, (r.RenderPosition - baseRender).Length());
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}
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Assert.True(maxPos == 0f && maxRender == 0f,
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$"post-walk rest drifted: pos={maxPos * 1e6f:F3} µm, render={maxRender * 1e6f:F3} µm");
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}
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[Fact]
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public void Update_ForwardInput_MovesInFacingDirection()
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{
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var engine = MakeFlatEngine();
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var controller = new PlayerMovementController(engine);
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controller.SetPosition(new Vector3(96f, 96f, 50f), 0x0001);
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controller.Yaw = 0f; // facing +X
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// L.5 physics-tick gate (235de33, 2026-04-30): Update() integrates
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// only one MinQuantum (~0.033s) per MaxQuantum (~0.1s) tick, matching
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// retail's 30Hz physics. A single Update(1.0f) only advances one
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// MaxQuantum step (~0.312m at walk speed 3.12 m/s). Drive the
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// controller one MaxQuantum at a time for ~1s to accumulate real
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// forward motion (8 × 0.1s = 0.8s × 3.12 m/s ≈ 2.5m).
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var input = new MovementInput { Forward = true };
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MovementResult result = default;
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int ticks = (int)MathF.Ceiling(1.0f / PhysicsBody.MaxQuantum) + 1; // ~11 ticks
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for (int i = 0; i < ticks; i++)
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result = controller.Update(PhysicsBody.MaxQuantum, input);
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// Should have moved >2 units in +X (walk speed over ~1s).
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Assert.True(result.Position.X > 96f + 2f, $"X={result.Position.X} should have moved forward");
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}
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[Fact]
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public void Update_SubQuantumFrame_InterpolatesRenderPositionWithoutAdvancingPhysicsPosition()
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{
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var engine = MakeFlatEngine();
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var controller = new PlayerMovementController(engine);
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var start = new Vector3(96f, 96f, 50f);
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controller.SetPosition(start, 0x0001);
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controller.Yaw = 0f;
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var firstTick = controller.Update(PhysicsBody.MinQuantum, new MovementInput(Forward: true));
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Assert.True(firstTick.Position.X > start.X, "Physics tick should advance the authoritative body position");
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Assert.Equal(start.X, firstTick.RenderPosition.X, precision: 4);
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var halfFrame = controller.Update(PhysicsBody.MinQuantum * 0.5f, new MovementInput(Forward: true));
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Assert.Equal(firstTick.Position.X, halfFrame.Position.X, precision: 4);
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Assert.True(halfFrame.RenderPosition.X > start.X, "Render position should move between physics ticks");
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Assert.True(halfFrame.RenderPosition.X < firstTick.Position.X,
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$"Render X={halfFrame.RenderPosition.X} should stay between {start.X} and {firstTick.Position.X}");
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float expectedMidpoint = start.X + ((firstTick.Position.X - start.X) * 0.5f);
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Assert.Equal(expectedMidpoint, halfFrame.RenderPosition.X, precision: 3);
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}
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[Fact]
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public void SetPosition_ResnapsRenderInterpolationEndpoints()
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{
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var engine = MakeFlatEngine();
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var controller = new PlayerMovementController(engine);
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controller.SetPosition(new Vector3(96f, 96f, 50f), 0x0001);
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controller.Yaw = 0f;
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controller.Update(PhysicsBody.MinQuantum, new MovementInput(Forward: true));
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controller.Update(PhysicsBody.MinQuantum * 0.5f, new MovementInput(Forward: true));
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var snapped = new Vector3(120f, 80f, 50f);
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controller.SetPosition(snapped, 0x0001);
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var result = controller.Update(PhysicsBody.MinQuantum * 0.5f, new MovementInput());
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Assert.Equal(snapped, result.Position);
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Assert.Equal(snapped, result.RenderPosition);
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}
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[Fact]
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public void Update_HugeQuantumDiscard_ResnapsRenderInterpolationEndpoints()
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{
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var engine = MakeFlatEngine();
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var controller = new PlayerMovementController(engine);
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controller.SetPosition(new Vector3(96f, 96f, 50f), 0x0001);
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controller.Yaw = 0f;
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var moved = controller.Update(PhysicsBody.MinQuantum, new MovementInput(Forward: true));
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var stale = controller.Update(PhysicsBody.HugeQuantum + 0.1f, new MovementInput(Forward: true));
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Assert.Equal(moved.Position.X, stale.Position.X, precision: 4);
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Assert.Equal(stale.Position, stale.RenderPosition);
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}
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[Fact]
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public void Update_LeftoverAboveMinQuantum_ClampsRenderAlphaToCurrentPhysicsPosition()
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{
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var engine = MakeFlatEngine();
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var controller = new PlayerMovementController(engine);
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controller.SetPosition(new Vector3(96f, 96f, 50f), 0x0001);
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controller.Yaw = 0f;
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var result = controller.Update(
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PhysicsBody.MaxQuantum + PhysicsBody.MinQuantum,
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new MovementInput(Forward: true));
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Assert.Equal(result.Position.X, result.RenderPosition.X, precision: 4);
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Assert.Equal(result.Position.Y, result.RenderPosition.Y, precision: 4);
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Assert.Equal(result.Position.Z, result.RenderPosition.Z, precision: 4);
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}
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[Fact]
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public void Update_RunForward_MoveFasterThanWalk()
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{
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var engine = MakeFlatEngine();
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var controller = new PlayerMovementController(engine);
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controller.SetPosition(new Vector3(96f, 96f, 50f), 0x0001);
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controller.Yaw = 0f;
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var walkInput = new MovementInput { Forward = true };
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var walkResult = controller.Update(1.0f, walkInput);
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float walkDist = walkResult.Position.X - 96f;
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controller.SetPosition(new Vector3(96f, 96f, 50f), 0x0001);
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var runInput = new MovementInput { Forward = true, Run = true };
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var runResult = controller.Update(1.0f, runInput);
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float runDist = runResult.Position.X - 96f;
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Assert.True(runDist > walkDist, $"Run ({runDist}) should be faster than walk ({walkDist})");
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}
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[Fact]
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public void Update_TurnInput_ChangesYaw()
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{
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var engine = MakeFlatEngine();
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var controller = new PlayerMovementController(engine);
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controller.SetPosition(new Vector3(96f, 96f, 50f), 0x0001);
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float initialYaw = controller.Yaw;
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var input = new MovementInput { TurnRight = true };
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controller.Update(0.5f, input);
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Assert.NotEqual(initialYaw, controller.Yaw);
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}
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[Fact]
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public void MotionStateChanged_WhenStartingToWalk()
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{
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var engine = MakeFlatEngine();
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var controller = new PlayerMovementController(engine);
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controller.SetPosition(new Vector3(96f, 96f, 50f), 0x0001);
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// First frame: idle (no input).
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controller.Update(0.016f, new MovementInput());
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// Second frame: start walking.
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var input = new MovementInput { Forward = true };
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var result = controller.Update(0.016f, input);
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Assert.True(result.MotionStateChanged);
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}
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[Fact]
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public void Update_JumpOnFlatTerrain_BecomesAirborne()
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{
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var engine = MakeFlatEngine();
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var controller = new PlayerMovementController(engine);
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controller.SetPosition(new Vector3(96f, 96f, 50f), 0x0001);
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// Charged jump: hold for a full charge (1s dt), then release to fire.
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// A full charge gives enough Vz that the player clears the 0.05-unit
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// ground-snap threshold within the same integration frame.
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controller.Update(1.0f, new MovementInput(Jump: true)); // full charge
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controller.Update(0.016f, new MovementInput(Jump: false)); // release → jump fires
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Assert.True(controller.IsAirborne);
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Assert.True(controller.VerticalVelocity > 0f);
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}
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[Fact]
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public void Update_AirborneFrames_ZRiseThenFalls()
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{
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var engine = MakeFlatEngine();
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var controller = new PlayerMovementController(engine);
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controller.SetPosition(new Vector3(96f, 96f, 50f), 0x0001);
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// Charged jump: hold for a full charge, then release.
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controller.Update(1.0f, new MovementInput(Jump: true)); // full charge
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controller.Update(0.016f, new MovementInput(Jump: false)); // release → jump fires
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float z1 = controller.Position.Z;
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// A few frames of rising
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controller.Update(0.1f, new MovementInput());
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float z2 = controller.Position.Z;
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Assert.True(z2 > z1, "Should be rising");
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// Many frames — should come back down.
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// DefaultJumpVz = 10 m/s → full flight time ≈ 2.04s, so run 50 × 50ms = 2.5s
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// to ensure the player has definitely landed.
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for (int i = 0; i < 50; i++)
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controller.Update(0.05f, new MovementInput());
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Assert.False(controller.IsAirborne, "Should have landed");
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Assert.Equal(50f, controller.Position.Z, precision: 1);
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}
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[Fact]
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public void Update_WalkOffLedge_BecomesFalling()
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{
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// Build terrain with a sharp cliff: grid x<5 = Z50, grid x>=5 = Z20.
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// heights[x*9+y] is indexed x-major; heightTable[i]=i*1f so
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// byte value == Z value directly.
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var heights = new byte[81];
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for (int x = 0; x < 9; x++)
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for (int y = 0; y < 9; y++)
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heights[x * 9 + y] = (byte)(x < 5 ? 50 : 20);
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var heightTable = new float[256];
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for (int i = 0; i < 256; i++) heightTable[i] = i * 1f;
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var engine = new PhysicsEngine();
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var terrain = new TerrainSurface(heights, heightTable);
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engine.AddLandblock(0xA9B4FFFFu, terrain, Array.Empty<CellSurface>(),
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Array.Empty<PortalPlane>(), worldOffsetX: 0f, worldOffsetY: 0f);
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// Position the player just before the cliff edge (localX=118 ≈ grid x=4.92).
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// At this point terrain Z is ~51.7 (bilinear interpolation near the high side).
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// One step at walk speed will cross into the low region where terrain drops
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// ~28 units — more than StepUpHeight=5, triggering the ledge-fall.
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var controller = new PlayerMovementController(engine);
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controller.SetPosition(new Vector3(118f, 96f, 50f), 0x0001);
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controller.Yaw = 0f; // facing +X
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// Single step — should trigger airborne state because terrain drops sharply.
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controller.Update(0.05f, new MovementInput(Forward: true));
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Assert.True(controller.IsAirborne, "Player should be airborne after stepping off the cliff");
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// Simulate enough frames to fall and land on the Z=20 floor.
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for (int i = 0; i < 60; i++)
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controller.Update(0.05f, new MovementInput(Forward: true));
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Assert.False(controller.IsAirborne, "Player should have landed");
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Assert.Equal(20f, controller.Position.Z, precision: 1);
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}
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}
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