diag(render): §4 flap apparatus — eye-vs-terrain field + GL-state tripwire
Two probe additions from the §4 outdoor full-world flap investigation (world turns to fog-tinted clear color at specific outdoor spots; strobes then holds; camera rotation recovers; forward-walk triggers): - [pv-input] gains terrZ=/eyeAbove= (terrain height under the camera eye) — used to REFUTE the buried-eye hypothesis (eyeAbove stayed +1.6..2.1 m through every held-flap block). - [gl-state] (ACDREAM_PROBE_GLSTATE=1): snapshots the GL fixed-function state entering the world passes (depth, blend, cull, scissor + box, viewport, FBO, color/clip masks, glGetError), printing on change. Delivered the frame-exact flap-onset marker: the leftover scissor box flips from full-screen to a drifting 9x21 px doorway footprint at the exact frame the nearby building flood merges in (pv-input flood 1->5). Both probes are gated and zero-cost when off. Strip with the rest of the §4 apparatus when the flap ships. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Erik
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2 changed files with 78 additions and 1 deletions
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@ -7102,6 +7102,11 @@ public sealed class GameWindow : IDisposable
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_gl.CullFace(TriangleFace.Back);
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_gl.FrontFace(FrontFaceDirection.CW);
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// §4 flap apparatus: GL-state tripwire — one [gl-state] line whenever the
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// state entering the world passes differs from the previous frame.
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if (AcDream.Core.Rendering.RenderingDiagnostics.ProbeGlStateEnabled)
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EmitGlStateTripwireIfChanged();
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// Phase N.6 slice 1: one-shot surface-format histogram dump under
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// ACDREAM_DUMP_SURFACES=1. Zero cost when off.
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_textureCache?.TickSurfaceHistogramDumpIfEnabled();
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@ -7615,8 +7620,16 @@ public sealed class GameWindow : IDisposable
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// flickers while idle, exactly one of {eye, player, rawPlayer, yaw} is the varying input.
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var pvRawPlayer = _playerController?.Position ?? playerViewPos;
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float pvYaw = _playerController?.Yaw ?? 0f;
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// §4 outdoor flap (2026-06-09): terrain height under the EYE — if the
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// camera boom is buried in a hillside (eyeAbove < 0), every nearby
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// terrain triangle backface-culls and the view punches through the
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// world to the clear color. Pin or refute eye-under-terrain.
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float? pvTerrZ = _physicsEngine.SampleTerrainZ(camPos.X, camPos.Y);
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string pvTerr = pvTerrZ is { } tz
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? System.FormattableString.Invariant($"terrZ={tz:F3} eyeAbove={camPos.Z - tz:F3}")
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: "terrZ=n/a eyeAbove=n/a";
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Console.WriteLine(System.FormattableString.Invariant(
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$"[pv-input] outRoot={pvOutRoot} flood={pvFrame.OrderedVisibleCells.Count} eye=({camPos.X:F6},{camPos.Y:F6},{camPos.Z:F6}) player=({playerViewPos.X:F6},{playerViewPos.Y:F6},{playerViewPos.Z:F6}) rawPlayer=({pvRawPlayer.X:F6},{pvRawPlayer.Y:F6},{pvRawPlayer.Z:F6}) yaw={pvYaw:F8} vp=[{vp.M11:F6} {vp.M13:F6} {vp.M22:F6} {vp.M31:F6} {vp.M33:F6} {vp.M41:F6} {vp.M42:F6} {vp.M43:F6}]"));
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$"[pv-input] outRoot={pvOutRoot} flood={pvFrame.OrderedVisibleCells.Count} eye=({camPos.X:F6},{camPos.Y:F6},{camPos.Z:F6}) player=({playerViewPos.X:F6},{playerViewPos.Y:F6},{playerViewPos.Z:F6}) rawPlayer=({pvRawPlayer.X:F6},{pvRawPlayer.Y:F6},{pvRawPlayer.Z:F6}) yaw={pvYaw:F8} {pvTerr} vp=[{vp.M11:F6} {vp.M13:F6} {vp.M22:F6} {vp.M31:F6} {vp.M33:F6} {vp.M41:F6} {vp.M42:F6} {vp.M43:F6}]"));
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}
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sigPvFrame = pviewResult.PortalFrame;
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@ -9535,6 +9548,58 @@ public sealed class GameWindow : IDisposable
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}
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}
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// §4 flap apparatus (2026-06-09): GL-state tripwire. Snapshots the fixed-function
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// state entering the world passes; prints [gl-state] only when it CHANGES from the
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// previous frame. Every CPU-side input is probe-exonerated for the outdoor
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// full-world flap; this pins or refutes the leaked-GL-state family
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// (feedback_render_self_contained_gl_state — 3 prior hits). Throwaway.
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private string? _lastGlStateSig;
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private long _glStateFrame;
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private long _glStateStable;
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private void EmitGlStateTripwireIfChanged()
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{
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var gl = _gl;
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if (gl is null) return;
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_glStateFrame++;
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Span<int> sbox = stackalloc int[4];
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Span<int> vp = stackalloc int[4];
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gl.GetInteger(GetPName.ScissorBox, sbox);
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gl.GetInteger(GetPName.Viewport, vp);
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int clipBits = 0;
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for (int i = 0; i < ClipFrame.MaxPlanes; i++)
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if (gl.IsEnabled(EnableCap.ClipDistance0 + i)) clipBits |= 1 << i;
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var err = gl.GetError();
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// All-integer fields — culture-safe with plain interpolation.
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string sig =
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$"depth={(gl.IsEnabled(EnableCap.DepthTest) ? 1 : 0)} " +
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$"dmask={(gl.GetBoolean(GetPName.DepthWritemask) ? 1 : 0)} " +
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$"dfunc=0x{gl.GetInteger(GetPName.DepthFunc):X} " +
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$"blend={(gl.IsEnabled(EnableCap.Blend) ? 1 : 0)} " +
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$"bsrc=0x{gl.GetInteger(GetPName.BlendSrcRgb):X} bdst=0x{gl.GetInteger(GetPName.BlendDstRgb):X} " +
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$"cull={(gl.IsEnabled(EnableCap.CullFace) ? 1 : 0)} cmode=0x{gl.GetInteger(GetPName.CullFaceMode):X} " +
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$"fface=0x{gl.GetInteger(GetPName.FrontFace):X} " +
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$"scis={(gl.IsEnabled(EnableCap.ScissorTest) ? 1 : 0)} sbox=({sbox[0]},{sbox[1]},{sbox[2]},{sbox[3]}) " +
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$"vp=({vp[0]},{vp[1]},{vp[2]},{vp[3]}) " +
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$"fbo={gl.GetInteger(GetPName.DrawFramebufferBinding)} " +
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$"a2c={(gl.IsEnabled(EnableCap.SampleAlphaToCoverage) ? 1 : 0)} " +
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$"stencil={(gl.IsEnabled(EnableCap.StencilTest) ? 1 : 0)} " +
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$"clip=0x{clipBits:X2} err=0x{(int)err:X}";
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if (sig == _lastGlStateSig)
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{
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_glStateStable++;
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return;
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}
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Console.WriteLine($"[gl-state] frame={_glStateFrame} stable={_glStateStable} {sig}");
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_lastGlStateSig = sig;
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_glStateStable = 0;
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}
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private void EnableClipDistances()
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{
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for (int i = 0; i < ClipFrame.MaxPlanes; i++)
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@ -143,6 +143,18 @@ public static class RenderingDiagnostics
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public static bool ProbePvInputEnabled { get; set; } =
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Environment.GetEnvironmentVariable("ACDREAM_PROBE_PVINPUT") == "1";
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/// <summary>
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/// §4 outdoor full-world flap apparatus (2026-06-09). When true, GameWindow snapshots the
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/// GL fixed-function state entering the world passes each frame (depth test/mask/func, blend
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/// + factors, cull, front-face, scissor + box, viewport, draw-FBO, color mask, glGetError)
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/// and emits one <c>[gl-state]</c> line whenever the snapshot CHANGES. Pins or refutes the
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/// "leaked GL state" family for the flap (every CPU-side input — matrix, flood, clip planes,
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/// scissor box, membership, eye-vs-terrain — is already probe-exonerated). Throwaway
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/// apparatus — strip once §4 ships. Initial state from <c>ACDREAM_PROBE_GLSTATE=1</c>.
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/// </summary>
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public static bool ProbeGlStateEnabled { get; set; } =
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Environment.GetEnvironmentVariable("ACDREAM_PROBE_GLSTATE") == "1";
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/// <summary>
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/// Bounded-propagation port apparatus (2026-06-08). When true, PortalVisibilityBuilder.Build emits
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/// one [portal-churn] summary line per call: per-cell pop count (re-pops = churn), total re-enqueues,
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