bf2e559369
Adds the GPU mechanism to clip drawing to a per-cell screen-space convex
region via gl_ClipDistance, consumed by the mesh + terrain vertex shaders.
This is the MECHANISM only — every instance defaults to slot 0 (no-clip /
pass-all) and terrain to count 0, so the running game renders IDENTICALLY to
pre-U.3 (verified: offline launch compiles both shaders and reaches steady
state; no GL errors). U.4 populates real clip data from portal visibility.
Binding contract (define once, both sides obey):
- mesh_modern.vert: SSBO binding=2 CellClip[] (shared per-frame regions, slot 0
reserved no-clip) + SSBO binding=3 uint[] per-instance slot, indexed by the
IDENTICAL gl_BaseInstanceARB+gl_InstanceID used for binding=0. binding=0/1
untouched.
- terrain_modern.vert: UBO binding=2 TerrainClip { int count; vec4 planes[8]; }
for the single OutsideView region (UBO namespace; SceneLighting is UBO
binding=1, so binding=2 is free and does not collide with the mesh SSBO
binding=2). count 0 = ungated.
- Both redeclare out gl_PerVertex { vec4 gl_Position; float gl_ClipDistance[8]; }
and set unused planes (i >= count) to +1.0 so they pass everything.
CellClip std430 layout (144 bytes/slot): count@0, 3 pad uints@4/8/12,
planes[8]@16 (vec4 stride 16). Terrain UBO std140: count@0 (padded to 16),
planes[8]@16 → 144 bytes. Verified by ClipFrameLayoutTests (8 new tests).
Pieces:
- ClipFrame: per-frame container + uploader for the SHARED clip data (binding=2
SSBO + terrain UBO). NoClip() = slot 0 + terrain count 0. AppendSlot /
SetTerrainClip pack std430/std140 bytes for U.4. UploadShared binds both.
- WbDrawDispatcher + EnvCellRenderer: each owns its binding=3 zero buffer
(all-zeros sized to its instance count → slot 0), re-binds binding=2 from the
shared ClipFrame id (or an internal no-clip fallback if unwired) before MDI.
gl_ClipDistance is per-vertex, so the single glMultiDrawElementsIndirect per
group is preserved — no draw splitting.
- TerrainModernRenderer: binds the terrain clip UBO (shared or no-clip fallback)
before its draw.
- GameWindow: glEnable(GL_CLIP_DISTANCE0..7) once at init (unused planes pass-all
so always-on avoids per-draw thrash); per frame builds ClipFrame.NoClip(),
UploadShared, and hands the buffer ids to the three renderers (tiny diff; U.4
swaps NoClip() for the real portal-visibility frame).
Gate: dotnet build green; App suite 134/134; offline launch confirms both
shaders compile + link with no GL errors.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
425 lines
18 KiB
C#
425 lines
18 KiB
C#
using System.Numerics;
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using AcDream.App.Rendering.Wb;
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using AcDream.Core.Terrain;
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using Silk.NET.OpenGL;
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namespace AcDream.App.Rendering;
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/// <summary>
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/// Phase N.5b modern terrain dispatcher. Single global VBO/EBO with a slot
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/// allocator (one slot per landblock, 384 verts × 40 bytes = 15,360 bytes
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/// per slot). Per-frame: build a DrawElementsIndirectCommand array from
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/// visible slots, upload, dispatch via glMultiDrawElementsIndirect. Atlas
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/// textures bound via bindless handles set per-frame as sampler uniforms.
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///
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/// Total ~6-8 GL calls per frame for terrain regardless of visible
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/// landblock count.
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/// </summary>
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public sealed unsafe class TerrainModernRenderer : IDisposable
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{
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// VertsPerLandblock MUST stay divisible by 6 — terrain_modern.vert uses
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// `gl_VertexID % 6` to pick the cell-corner index (BL/BR/TR/TL), and
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// because we bake `slot * VertsPerLandblock` into indices CPU-side and
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// pass BaseVertex=0 to MultiDrawElementsIndirect, gl_VertexID becomes
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// `slot * VertsPerLandblock + local_index`. The shader's modulo-6 only
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// reduces to `local_index % 6` because 384 is a multiple of 6. Changing
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// either constant without auditing the shader will silently mis-render.
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private const int VertsPerLandblock = LandblockMesh.VerticesPerLandblock; // 384 (= 64 cells * 6 verts)
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private const int IndicesPerLandblock = VertsPerLandblock;
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private const int VertexSize = 40; // sizeof(TerrainVertex)
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private const int IndexSize = sizeof(uint);
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private const float LandblockSize = LandblockMesh.LandblockSize; // 192
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private readonly GL _gl;
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private readonly BindlessSupport _bindless;
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private readonly Shader _shader;
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private readonly TerrainAtlas _atlas;
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/// <summary>A.5 T22.5: exposes the terrain atlas so callers can update
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/// anisotropic level mid-session via <see cref="TerrainAtlas.SetAnisotropic"/>.</summary>
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public TerrainAtlas Atlas => _atlas;
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private readonly TerrainSlotAllocator _alloc;
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// Per-slot live data (index by slot integer; null entries are unused slots).
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private SlotData?[] _slots;
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// Reverse map: landblockId -> slot, for RemoveLandblock and replacement.
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private readonly Dictionary<uint, int> _idToSlot = new();
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// GPU buffers.
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private uint _globalVao;
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private uint _globalVbo;
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private uint _globalEbo;
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private uint _indirectBuffer;
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private int _indirectCapacity;
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// Phase U.3: terrain clip UBO (binding=2, terrain_modern.vert TerrainClip).
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// The shared one is created + uploaded by the GameWindow-level ClipFrame and
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// handed in via SetClipUbo. When 0, we bind a lazily-created no-clip fallback
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// (count 0 = ungated) so the shader never reads an unbound UBO at binding=2.
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private uint _sharedClipUbo;
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private uint _fallbackClipUbo;
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// Cached uvec2-handle uniform locations (matrix uniforms are set by name via Shader.SetMatrix4).
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private int _uTerrainHandleLoc;
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private int _uAlphaHandleLoc;
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// Reusable per-frame buffers.
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private readonly List<int> _visibleSlots = new();
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private DrawElementsIndirectCommand[] _deicScratch = Array.Empty<DrawElementsIndirectCommand>();
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// Diag.
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public int LoadedSlots => _alloc.LoadedCount;
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public int VisibleSlots => _visibleSlots.Count;
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public int CapacitySlots => _alloc.Capacity;
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public TerrainModernRenderer(
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GL gl,
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BindlessSupport bindless,
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Shader shader,
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TerrainAtlas atlas,
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int initialSlotCapacity = 64)
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{
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_gl = gl;
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_bindless = bindless;
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_shader = shader;
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_atlas = atlas;
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_alloc = new TerrainSlotAllocator(initialSlotCapacity);
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_slots = new SlotData?[initialSlotCapacity];
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_uTerrainHandleLoc = _gl.GetUniformLocation(_shader.Program, "uTerrainHandle");
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_uAlphaHandleLoc = _gl.GetUniformLocation(_shader.Program, "uAlphaHandle");
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_globalVao = _gl.GenVertexArray();
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_globalVbo = _gl.GenBuffer();
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_globalEbo = _gl.GenBuffer();
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AllocateGpuBuffers(initialSlotCapacity);
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ConfigureVao();
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_indirectBuffer = _gl.GenBuffer();
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}
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/// <summary>
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/// Phase U.3: hand the renderer the SHARED terrain-clip UBO (binding=2)
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/// created by <see cref="ClipFrame.UploadShared"/>. The renderer binds it to
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/// binding=2 before its draw. Pass 0 to fall back to the internal no-clip UBO
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/// (count 0 = ungated terrain).
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/// </summary>
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public void SetClipUbo(uint sharedClipUbo) => _sharedClipUbo = sharedClipUbo;
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/// <summary>
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/// Two-tier streaming entry point. Accepts a prebuilt mesh from
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/// <see cref="LandblockStreamResult.Loaded.MeshData"/> built on the worker
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/// thread, together with the world-space origin computed by the caller
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/// (render-thread GameWindow derives it from landblockId + liveCenterX/Y).
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///
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/// Delegates to <see cref="AddLandblock(uint,LandblockMeshData,Vector3)"/>
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/// so both paths share one upload path. Per Phase A.5 spec T15.
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/// </summary>
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public void AddLandblockWithMesh(uint landblockId, LandblockMeshData meshData, Vector3 worldOrigin)
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=> AddLandblock(landblockId, meshData, worldOrigin);
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public void AddLandblock(uint landblockId, LandblockMeshData meshData, Vector3 worldOrigin)
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{
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ArgumentNullException.ThrowIfNull(meshData);
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if (meshData.Vertices.Length != VertsPerLandblock)
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throw new ArgumentException(
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$"Expected {VertsPerLandblock} vertices, got {meshData.Vertices.Length}",
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nameof(meshData));
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if (meshData.Indices.Length != IndicesPerLandblock)
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throw new ArgumentException(
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$"Expected {IndicesPerLandblock} indices, got {meshData.Indices.Length}",
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nameof(meshData));
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if (_idToSlot.ContainsKey(landblockId))
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RemoveLandblock(landblockId);
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int slot = _alloc.Allocate(out var needsGrow);
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if (needsGrow)
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{
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int newCap = Math.Max(_alloc.Capacity * 2, slot + 1);
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EnsureCapacity(newCap);
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}
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// Bake worldOrigin into vertex positions; capture min/max Z for AABB.
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var bakedVerts = new TerrainVertex[VertsPerLandblock];
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float zMin = float.MaxValue, zMax = float.MinValue;
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for (int i = 0; i < VertsPerLandblock; i++)
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{
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var v = meshData.Vertices[i];
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var worldPos = v.Position + worldOrigin;
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bakedVerts[i] = new TerrainVertex(worldPos, v.Normal, v.Data0, v.Data1, v.Data2, v.Data3);
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if (worldPos.Z < zMin) zMin = worldPos.Z;
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if (worldPos.Z > zMax) zMax = worldPos.Z;
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}
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if (zMin == float.MaxValue) { zMin = 0f; zMax = 0f; }
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// Bake baseVertex into indices on the CPU side (driver-portable pattern).
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uint baseVertex = (uint)(slot * VertsPerLandblock);
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var bakedIndices = new uint[IndicesPerLandblock];
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for (int i = 0; i < IndicesPerLandblock; i++)
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bakedIndices[i] = meshData.Indices[i] + baseVertex;
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// glBufferSubData into the slot's VBO + EBO regions.
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nint vboByteOffset = (nint)(slot * VertsPerLandblock * VertexSize);
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nint eboByteOffset = (nint)(slot * IndicesPerLandblock * IndexSize);
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_gl.BindBuffer(BufferTargetARB.ArrayBuffer, _globalVbo);
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fixed (TerrainVertex* p = bakedVerts)
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{
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_gl.BufferSubData(BufferTargetARB.ArrayBuffer, vboByteOffset,
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(nuint)(VertsPerLandblock * VertexSize), p);
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}
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_gl.BindBuffer(BufferTargetARB.ArrayBuffer, 0);
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_gl.BindBuffer(BufferTargetARB.ElementArrayBuffer, _globalEbo);
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fixed (uint* p = bakedIndices)
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{
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_gl.BufferSubData(BufferTargetARB.ElementArrayBuffer, eboByteOffset,
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(nuint)(IndicesPerLandblock * IndexSize), p);
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}
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_gl.BindBuffer(BufferTargetARB.ElementArrayBuffer, 0);
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_slots[slot] = new SlotData
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{
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LandblockId = landblockId,
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WorldOrigin = worldOrigin,
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FirstIndex = (uint)(slot * IndicesPerLandblock),
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IndexCount = IndicesPerLandblock,
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AabbMin = new Vector3(worldOrigin.X, worldOrigin.Y, zMin),
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AabbMax = new Vector3(worldOrigin.X + LandblockSize, worldOrigin.Y + LandblockSize, zMax),
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};
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_idToSlot[landblockId] = slot;
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}
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public void RemoveLandblock(uint landblockId)
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{
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if (!_idToSlot.TryGetValue(landblockId, out var slot))
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return;
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_idToSlot.Remove(landblockId);
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_slots[slot] = null;
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_alloc.Free(slot);
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// No GPU clear: the per-frame DEIC array won't reference this slot.
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}
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public void Draw(ICamera camera, FrustumPlanes? frustum = null, uint? neverCullLandblockId = null)
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{
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if (_alloc.LoadedCount == 0) return;
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// Build visible slot list with per-slot frustum cull.
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_visibleSlots.Clear();
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for (int slot = 0; slot < _slots.Length; slot++)
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{
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var data = _slots[slot];
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if (data is null) continue;
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if (frustum is not null && data.LandblockId != neverCullLandblockId)
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{
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if (!FrustumCuller.IsAabbVisible(frustum.Value, data.AabbMin, data.AabbMax))
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continue;
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}
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_visibleSlots.Add(slot);
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}
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if (_visibleSlots.Count == 0) return;
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// Build DEIC array.
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if (_deicScratch.Length < _visibleSlots.Count)
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_deicScratch = new DrawElementsIndirectCommand[Math.Max(_visibleSlots.Count, 64)];
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for (int i = 0; i < _visibleSlots.Count; i++)
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{
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var data = _slots[_visibleSlots[i]]!;
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_deicScratch[i] = new DrawElementsIndirectCommand
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{
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Count = (uint)data.IndexCount,
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InstanceCount = 1u,
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FirstIndex = data.FirstIndex,
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BaseVertex = 0, // baked into indices on upload
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BaseInstance = 0,
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};
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}
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// Grow indirect buffer if needed.
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if (_visibleSlots.Count > _indirectCapacity)
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{
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_indirectCapacity = Math.Max(64, _visibleSlots.Count * 2);
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_gl.BindBuffer(GLEnum.DrawIndirectBuffer, _indirectBuffer);
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_gl.BufferData(GLEnum.DrawIndirectBuffer,
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(nuint)(_indirectCapacity * sizeof(DrawElementsIndirectCommand)),
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null, GLEnum.DynamicDraw);
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}
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else
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{
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_gl.BindBuffer(GLEnum.DrawIndirectBuffer, _indirectBuffer);
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}
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// Upload DEIC array.
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fixed (DrawElementsIndirectCommand* p = _deicScratch)
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{
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_gl.BufferSubData(GLEnum.DrawIndirectBuffer, 0,
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(nuint)(_visibleSlots.Count * sizeof(DrawElementsIndirectCommand)), p);
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}
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// Bind shader + uniforms + atlas handles.
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_shader.Use();
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_shader.SetMatrix4("uView", camera.View);
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_shader.SetMatrix4("uProjection", camera.Projection);
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var (terrainHandle, alphaHandle) = _atlas.GetBindlessHandles();
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// Pass each 64-bit handle as a uvec2 (low 32 bits, high 32 bits).
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// GLSL constructs sampler2DArray(uTerrainHandle) at the use site —
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// see terrain_modern.frag for why this is the safe pattern.
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_gl.ProgramUniform2(_shader.Program, _uTerrainHandleLoc,
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(uint)(terrainHandle & 0xFFFFFFFFu), (uint)(terrainHandle >> 32));
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_gl.ProgramUniform2(_shader.Program, _uAlphaHandleLoc,
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(uint)(alphaHandle & 0xFFFFFFFFu), (uint)(alphaHandle >> 32));
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// Phase U.3: bind the terrain clip UBO (binding=2). Shared ClipFrame UBO
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// when wired, else the no-clip fallback (count 0 = ungated terrain).
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BindClipUboBinding2();
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_gl.BindVertexArray(_globalVao);
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_gl.MemoryBarrier(MemoryBarrierMask.CommandBarrierBit);
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_gl.MultiDrawElementsIndirect(
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PrimitiveType.Triangles, DrawElementsType.UnsignedInt,
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(void*)0,
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(uint)_visibleSlots.Count,
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(uint)sizeof(DrawElementsIndirectCommand));
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_gl.BindVertexArray(0);
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_gl.BindBuffer(GLEnum.DrawIndirectBuffer, 0);
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}
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public void Dispose()
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{
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_gl.DeleteVertexArray(_globalVao);
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_gl.DeleteBuffer(_globalVbo);
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_gl.DeleteBuffer(_globalEbo);
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_gl.DeleteBuffer(_indirectBuffer);
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if (_fallbackClipUbo != 0) { _gl.DeleteBuffer(_fallbackClipUbo); _fallbackClipUbo = 0; } // Phase U.3
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}
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// ----------------------------------------------------------------
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// Private helpers
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// ----------------------------------------------------------------
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/// <summary>
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/// Phase U.3: bind the terrain clip UBO to binding=2. Prefers the shared
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/// <see cref="ClipFrame"/> UBO (<see cref="SetClipUbo"/>); otherwise lazily
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/// creates + binds a no-clip fallback (count 0 = ungated) so the shader never
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/// reads an unbound UBO. The fallback is std140-sized to
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/// <see cref="ClipFrame.TerrainUboBytes"/> and zero-filled (count 0).
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/// </summary>
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private void BindClipUboBinding2()
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{
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if (_sharedClipUbo != 0)
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{
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_gl.BindBufferBase(BufferTargetARB.UniformBuffer,
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ClipFrame.TerrainClipUboBinding, _sharedClipUbo);
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return;
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}
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if (_fallbackClipUbo == 0)
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{
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_fallbackClipUbo = _gl.GenBuffer();
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var zero = stackalloc byte[ClipFrame.TerrainUboBytes];
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for (int i = 0; i < ClipFrame.TerrainUboBytes; i++) zero[i] = 0;
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_gl.BindBuffer(BufferTargetARB.UniformBuffer, _fallbackClipUbo);
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_gl.BufferData(BufferTargetARB.UniformBuffer,
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(nuint)ClipFrame.TerrainUboBytes, zero, BufferUsageARB.DynamicDraw);
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}
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_gl.BindBufferBase(BufferTargetARB.UniformBuffer,
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ClipFrame.TerrainClipUboBinding, _fallbackClipUbo);
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}
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private void AllocateGpuBuffers(int capacitySlots)
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{
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nuint vboBytes = (nuint)(capacitySlots * VertsPerLandblock * VertexSize);
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nuint eboBytes = (nuint)(capacitySlots * IndicesPerLandblock * IndexSize);
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_gl.BindBuffer(BufferTargetARB.ArrayBuffer, _globalVbo);
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_gl.BufferData(BufferTargetARB.ArrayBuffer, vboBytes, null, BufferUsageARB.DynamicDraw);
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_gl.BindBuffer(BufferTargetARB.ArrayBuffer, 0);
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_gl.BindBuffer(BufferTargetARB.ElementArrayBuffer, _globalEbo);
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_gl.BufferData(BufferTargetARB.ElementArrayBuffer, eboBytes, null, BufferUsageARB.DynamicDraw);
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_gl.BindBuffer(BufferTargetARB.ElementArrayBuffer, 0);
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}
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private void ConfigureVao()
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{
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_gl.BindVertexArray(_globalVao);
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_gl.BindBuffer(BufferTargetARB.ArrayBuffer, _globalVbo);
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_gl.BindBuffer(BufferTargetARB.ElementArrayBuffer, _globalEbo);
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uint stride = (uint)VertexSize;
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// location 0: Position
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_gl.EnableVertexAttribArray(0);
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_gl.VertexAttribPointer(0, 3, VertexAttribPointerType.Float, false, stride, (void*)0);
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// location 1: Normal
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_gl.EnableVertexAttribArray(1);
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_gl.VertexAttribPointer(1, 3, VertexAttribPointerType.Float, false, stride, (void*)(3 * sizeof(float)));
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// locations 2-5: Data0..Data3 (uvec4 byte attributes)
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nint dataOffset = 6 * sizeof(float);
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_gl.EnableVertexAttribArray(2);
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_gl.VertexAttribIPointer(2, 4, VertexAttribIType.UnsignedByte, stride, (void*)dataOffset);
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_gl.EnableVertexAttribArray(3);
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_gl.VertexAttribIPointer(3, 4, VertexAttribIType.UnsignedByte, stride, (void*)(dataOffset + 4));
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_gl.EnableVertexAttribArray(4);
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_gl.VertexAttribIPointer(4, 4, VertexAttribIType.UnsignedByte, stride, (void*)(dataOffset + 8));
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_gl.EnableVertexAttribArray(5);
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_gl.VertexAttribIPointer(5, 4, VertexAttribIType.UnsignedByte, stride, (void*)(dataOffset + 12));
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_gl.BindVertexArray(0);
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}
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private void EnsureCapacity(int newCapacity)
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{
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if (newCapacity <= _alloc.Capacity) return;
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// Allocate new VBO + EBO at new size; copy old contents; swap; recreate VAO.
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uint newVbo = _gl.GenBuffer();
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uint newEbo = _gl.GenBuffer();
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nuint newVboBytes = (nuint)(newCapacity * VertsPerLandblock * VertexSize);
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nuint newEboBytes = (nuint)(newCapacity * IndicesPerLandblock * IndexSize);
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nuint oldVboBytes = (nuint)(_alloc.Capacity * VertsPerLandblock * VertexSize);
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nuint oldEboBytes = (nuint)(_alloc.Capacity * IndicesPerLandblock * IndexSize);
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_gl.BindBuffer(BufferTargetARB.ArrayBuffer, newVbo);
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_gl.BufferData(BufferTargetARB.ArrayBuffer, newVboBytes, null, BufferUsageARB.DynamicDraw);
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_gl.BindBuffer(BufferTargetARB.CopyReadBuffer, _globalVbo);
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_gl.BindBuffer(BufferTargetARB.CopyWriteBuffer, newVbo);
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_gl.CopyBufferSubData(CopyBufferSubDataTarget.CopyReadBuffer, CopyBufferSubDataTarget.CopyWriteBuffer,
|
||
0, 0, oldVboBytes);
|
||
_gl.DeleteBuffer(_globalVbo);
|
||
_globalVbo = newVbo;
|
||
|
||
_gl.BindBuffer(BufferTargetARB.ElementArrayBuffer, newEbo);
|
||
_gl.BufferData(BufferTargetARB.ElementArrayBuffer, newEboBytes, null, BufferUsageARB.DynamicDraw);
|
||
_gl.BindBuffer(BufferTargetARB.CopyReadBuffer, _globalEbo);
|
||
_gl.BindBuffer(BufferTargetARB.CopyWriteBuffer, newEbo);
|
||
_gl.CopyBufferSubData(CopyBufferSubDataTarget.CopyReadBuffer, CopyBufferSubDataTarget.CopyWriteBuffer,
|
||
0, 0, oldEboBytes);
|
||
_gl.DeleteBuffer(_globalEbo);
|
||
_globalEbo = newEbo;
|
||
|
||
// Recreate VAO with new buffer bindings.
|
||
_gl.DeleteVertexArray(_globalVao);
|
||
_globalVao = _gl.GenVertexArray();
|
||
ConfigureVao();
|
||
|
||
// Grow slot tracking array.
|
||
Array.Resize(ref _slots, newCapacity);
|
||
_alloc.GrowTo(newCapacity);
|
||
}
|
||
|
||
private sealed class SlotData
|
||
{
|
||
public uint LandblockId;
|
||
public Vector3 WorldOrigin;
|
||
public uint FirstIndex;
|
||
public int IndexCount;
|
||
public Vector3 AabbMin;
|
||
public Vector3 AabbMax;
|
||
}
|
||
}
|