1b6995d2df
Code quality review caught that BatchData uses Pack=4 but contains a ulong field. With the current field order (TextureHandle first), offset 0 is always 8-byte aligned so std430 works. But adding a 4-byte field before TextureHandle without bumping Pack would silently misalign the GPU struct. Pack=8 makes the alignment requirement explicit and adds a comment documenting expected std430 offsets. No runtime change — current offsets (0/8/12) are identical under both Pack values for this field order. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
564 lines
23 KiB
C#
564 lines
23 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Numerics;
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using System.Runtime.InteropServices;
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using AcDream.Core.Meshing;
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using AcDream.Core.Terrain;
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using AcDream.Core.World;
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using Chorizite.OpenGLSDLBackend.Lib;
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using Silk.NET.OpenGL;
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namespace AcDream.App.Rendering.Wb;
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/// <summary>
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/// Draws entities using WB's <see cref="ObjectRenderData"/> (a single global
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/// VAO/VBO/IBO under modern rendering) with acdream's <see cref="TextureCache"/>
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/// for texture resolution and <see cref="AcSurfaceMetadataTable"/> for
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/// translucency classification.
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///
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/// <para>
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/// <b>Atlas-tier</b> entities (<c>ServerGuid == 0</c>): mesh data comes from WB's
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/// <see cref="ObjectMeshManager"/> via <see cref="WbMeshAdapter.TryGetRenderData"/>.
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/// Textures resolve through <see cref="TextureCache.GetOrUpload"/> using the batch's
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/// <c>SurfaceId</c>.
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/// </para>
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///
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/// <para>
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/// <b>Per-instance-tier</b> entities (<c>ServerGuid != 0</c>): mesh data also from
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/// WB, but textures resolve through <see cref="TextureCache"/> with palette and
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/// surface overrides applied. <see cref="AnimatedEntityState"/> is currently
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/// unused at draw time — GameWindow's spawn path already bakes AnimPartChanges +
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/// GfxObjDegradeResolver (Issue #47 close-detail mesh) into <c>MeshRefs</c>.
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/// </para>
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///
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/// <para>
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/// <b>GL strategy:</b> GROUPED instanced drawing. All visible (entity, batch)
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/// pairs are bucketed by <see cref="GroupKey"/>; within a group a single
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/// <c>glDrawElementsInstancedBaseVertexBaseInstance</c> renders all instances.
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/// All matrices for the frame land in one shared instance VBO via a single
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/// <c>BufferData</c> upload. This drops draw calls from O(entities×batches)
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/// to O(unique GfxObj×batch×texture) — typically two orders of magnitude fewer.
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/// </para>
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///
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/// <para>
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/// <b>Shader:</b> reuses <c>mesh_instanced</c> (vert locations 0-2 = Position/
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/// Normal/UV from WB's <c>VertexPositionNormalTexture</c>; locations 3-6 = instance
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/// matrix from our VBO). WB's 32-byte vertex stride is compatible.
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/// </para>
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///
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/// <para>
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/// <b>Modern rendering assumption:</b> WB's <c>_useModernRendering</c> path (GL
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/// 4.3 + bindless) puts every mesh in a single shared VAO/VBO/IBO and uses
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/// <c>FirstIndex</c> + <c>BaseVertex</c> per batch. The dispatcher honors those
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/// offsets via <c>DrawElementsInstancedBaseVertex(BaseInstance)</c>. The legacy
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/// per-mesh-VAO path also works since FirstIndex/BaseVertex are zero there.
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/// </para>
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/// </summary>
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public sealed unsafe class WbDrawDispatcher : IDisposable
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{
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private readonly GL _gl;
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private readonly Shader _shader;
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private readonly TextureCache _textures;
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private readonly WbMeshAdapter _meshAdapter;
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private readonly EntitySpawnAdapter _entitySpawnAdapter;
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private readonly BindlessSupport _bindless;
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// SSBO buffer ids
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private uint _instanceSsbo;
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private uint _batchSsbo;
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private uint _indirectBuffer;
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// Per-frame scratch arrays — Tasks 9-10 fully wire these.
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private float[] _instanceData = new float[256 * 16]; // mat4 floats per instance
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private BatchData[] _batchData = new BatchData[256];
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private DrawElementsIndirectCommand[] _indirectCommands = new DrawElementsIndirectCommand[256];
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#pragma warning disable CS0169 // Tasks 9-10 wire these counters
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private int _opaqueDrawCount;
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private int _transparentDrawCount;
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private int _transparentByteOffset;
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#pragma warning restore CS0169
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// std430 layout: ulong TextureHandle (uvec2) at offset 0, uint TextureLayer
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// at offset 8, uint Flags at offset 12. Total 16 bytes.
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// Pack=8 (not 4) because std430's uvec2 requires 8-byte alignment — Pack=4
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// works today by accident (TextureHandle is the first field, so offset 0 is
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// always 8-byte aligned), but adding a 4-byte field before TextureHandle
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// without bumping Pack would silently misalign the GPU struct.
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[StructLayout(LayoutKind.Sequential, Pack = 8)]
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private struct BatchData
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{
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public ulong TextureHandle; // bindless handle (uvec2 in GLSL)
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public uint TextureLayer;
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public uint Flags;
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}
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private readonly HashSet<uint> _patchedVaos = new();
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// Per-frame scratch — reused across frames to avoid per-frame allocation.
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private readonly Dictionary<GroupKey, InstanceGroup> _groups = new();
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private readonly List<InstanceGroup> _opaqueDraws = new();
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private readonly List<InstanceGroup> _translucentDraws = new();
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private float[] _instanceBuffer = new float[256 * 16]; // grow on demand, never shrink
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// Per-entity-cull AABB radius. Conservative — covers most entities; large
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// outliers (long banners, tall columns) are still landblock-culled.
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private const float PerEntityCullRadius = 5.0f;
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private bool _disposed;
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// Diagnostic counters logged once per ~5s under ACDREAM_WB_DIAG=1.
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private int _entitiesSeen;
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private int _entitiesDrawn;
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private int _meshesMissing;
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private int _drawsIssued;
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private int _instancesIssued;
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private long _lastLogTick;
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public WbDrawDispatcher(
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GL gl,
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Shader shader,
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TextureCache textures,
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WbMeshAdapter meshAdapter,
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EntitySpawnAdapter entitySpawnAdapter,
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BindlessSupport bindless)
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{
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ArgumentNullException.ThrowIfNull(gl);
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ArgumentNullException.ThrowIfNull(shader);
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ArgumentNullException.ThrowIfNull(textures);
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ArgumentNullException.ThrowIfNull(meshAdapter);
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ArgumentNullException.ThrowIfNull(entitySpawnAdapter);
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_gl = gl;
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_shader = shader;
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_textures = textures;
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_meshAdapter = meshAdapter;
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_entitySpawnAdapter = entitySpawnAdapter;
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_bindless = bindless ?? throw new ArgumentNullException(nameof(bindless));
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_instanceSsbo = _gl.GenBuffer();
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_batchSsbo = _gl.GenBuffer();
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_indirectBuffer = _gl.GenBuffer();
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}
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public static Matrix4x4 ComposePartWorldMatrix(
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Matrix4x4 entityWorld,
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Matrix4x4 animOverride,
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Matrix4x4 restPose)
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=> restPose * animOverride * entityWorld;
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public void Draw(
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ICamera camera,
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IEnumerable<(uint LandblockId, Vector3 AabbMin, Vector3 AabbMax, IReadOnlyList<WorldEntity> Entities)> landblockEntries,
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FrustumPlanes? frustum = null,
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uint? neverCullLandblockId = null,
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HashSet<uint>? visibleCellIds = null,
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HashSet<uint>? animatedEntityIds = null)
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{
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_shader.Use();
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var vp = camera.View * camera.Projection;
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_shader.SetMatrix4("uViewProjection", vp);
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bool diag = string.Equals(Environment.GetEnvironmentVariable("ACDREAM_WB_DIAG"), "1", StringComparison.Ordinal);
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// Camera world-space position for front-to-back sort (perf #2). The view
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// matrix is the inverse of the camera's world transform, so the world
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// translation lives in the inverse's translation row.
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Vector3 camPos = Vector3.Zero;
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if (Matrix4x4.Invert(camera.View, out var invView))
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camPos = invView.Translation;
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// ── Phase 1: clear groups, walk entities, build groups ──────────────
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foreach (var grp in _groups.Values) grp.Matrices.Clear();
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var metaTable = _meshAdapter.MetadataTable;
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uint anyVao = 0;
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foreach (var entry in landblockEntries)
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{
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bool landblockVisible = frustum is null
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|| entry.LandblockId == neverCullLandblockId
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|| FrustumCuller.IsAabbVisible(frustum.Value, entry.AabbMin, entry.AabbMax);
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if (!landblockVisible && (animatedEntityIds is null || animatedEntityIds.Count == 0))
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continue;
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foreach (var entity in entry.Entities)
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{
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if (entity.MeshRefs.Count == 0) continue;
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bool isAnimated = animatedEntityIds?.Contains(entity.Id) == true;
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if (!landblockVisible && !isAnimated) continue;
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if (entity.ParentCellId.HasValue && visibleCellIds is not null
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&& !visibleCellIds.Contains(entity.ParentCellId.Value))
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continue;
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// Per-entity AABB frustum cull (perf #3). Skips work for distant
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// entities even when their landblock is visible. Animated
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// entities bypass — they're tracked at landblock level + need
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// per-frame work for animation regardless. Conservative 5m
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// radius covers typical entity bounds.
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if (frustum is not null && !isAnimated && entry.LandblockId != neverCullLandblockId)
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{
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var p = entity.Position;
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var aMin = new Vector3(p.X - PerEntityCullRadius, p.Y - PerEntityCullRadius, p.Z - PerEntityCullRadius);
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var aMax = new Vector3(p.X + PerEntityCullRadius, p.Y + PerEntityCullRadius, p.Z + PerEntityCullRadius);
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if (!FrustumCuller.IsAabbVisible(frustum.Value, aMin, aMax))
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continue;
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}
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if (diag) _entitiesSeen++;
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var entityWorld =
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Matrix4x4.CreateFromQuaternion(entity.Rotation) *
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Matrix4x4.CreateTranslation(entity.Position);
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// Compute palette-override hash ONCE per entity (perf #4).
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// Reused across every (part, batch) lookup so the FNV-1a fold
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// over SubPalettes runs once instead of N times. Zero when the
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// entity has no palette override (trees, scenery).
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ulong palHash = 0;
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if (entity.PaletteOverride is not null)
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palHash = TextureCache.HashPaletteOverride(entity.PaletteOverride);
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bool drewAny = false;
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for (int partIdx = 0; partIdx < entity.MeshRefs.Count; partIdx++)
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{
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// Note: GameWindow's spawn path already applies
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// AnimPartChanges + GfxObjDegradeResolver (Issue #47 fix —
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// close-detail mesh swap for humanoids) to MeshRefs. We
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// trust MeshRefs as the source of truth here. AnimatedEntityState's
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// overrides become relevant only for hot-swap (0xF625
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// ObjDescEvent) which today rebuilds MeshRefs anyway.
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var meshRef = entity.MeshRefs[partIdx];
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ulong gfxObjId = meshRef.GfxObjId;
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var renderData = _meshAdapter.TryGetRenderData(gfxObjId);
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if (renderData is null)
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{
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if (diag) _meshesMissing++;
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continue;
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}
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drewAny = true;
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if (anyVao == 0) anyVao = renderData.VAO;
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if (renderData.IsSetup && renderData.SetupParts.Count > 0)
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{
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foreach (var (partGfxObjId, partTransform) in renderData.SetupParts)
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{
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var partData = _meshAdapter.TryGetRenderData(partGfxObjId);
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if (partData is null) continue;
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var model = ComposePartWorldMatrix(
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entityWorld, meshRef.PartTransform, partTransform);
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ClassifyBatches(partData, partGfxObjId, model, entity, meshRef, palHash, metaTable);
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}
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}
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else
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{
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var model = meshRef.PartTransform * entityWorld;
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ClassifyBatches(renderData, gfxObjId, model, entity, meshRef, palHash, metaTable);
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}
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}
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if (diag && drewAny) _entitiesDrawn++;
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}
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}
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// Nothing visible — skip the GL pass entirely.
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if (anyVao == 0)
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{
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if (diag) MaybeFlushDiag();
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return;
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}
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// ── Phase 2: lay matrices out contiguously, assign per-group offsets,
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// split into opaque/translucent + compute sort keys ─────────
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int totalInstances = 0;
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foreach (var grp in _groups.Values) totalInstances += grp.Matrices.Count;
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if (totalInstances == 0)
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{
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if (diag) MaybeFlushDiag();
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return;
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}
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int needed = totalInstances * 16;
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if (_instanceBuffer.Length < needed)
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_instanceBuffer = new float[needed + 256 * 16]; // headroom
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_opaqueDraws.Clear();
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_translucentDraws.Clear();
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int cursor = 0;
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foreach (var grp in _groups.Values)
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{
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if (grp.Matrices.Count == 0) continue;
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grp.FirstInstance = cursor;
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grp.InstanceCount = grp.Matrices.Count;
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// Use the first instance's translation as the group's representative
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// position for front-to-back sort (perf #2). Cheap heuristic; works
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// well when instances of one group are spatially coherent
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// (typical for trees in one landblock area, NPCs at one spawn).
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var firstM = grp.Matrices[0];
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var grpPos = new Vector3(firstM.M41, firstM.M42, firstM.M43);
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grp.SortDistance = Vector3.DistanceSquared(camPos, grpPos);
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for (int i = 0; i < grp.Matrices.Count; i++)
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{
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WriteMatrix(_instanceBuffer, cursor * 16, grp.Matrices[i]);
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cursor++;
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}
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if (grp.Translucency == TranslucencyKind.Opaque || grp.Translucency == TranslucencyKind.ClipMap)
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_opaqueDraws.Add(grp);
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else
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_translucentDraws.Add(grp);
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}
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// Front-to-back sort for opaque pass: nearer groups draw first so the
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// depth test rejects fragments hidden behind them, reducing fragment
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// shader cost from overdraw on dense scenes (Holtburg courtyard,
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// Foundry interior).
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_opaqueDraws.Sort(static (a, b) => a.SortDistance.CompareTo(b.SortDistance));
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// ── Phase 3: one upload of all matrices ─────────────────────────────
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// NOTE: _instanceSsbo is temporarily bound as ArrayBuffer for compile
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// compatibility. Tasks 9-10 rewrite this to BindBufferBase(SSBO) +
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// glMultiDrawElementsIndirect.
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_gl.BindBuffer(BufferTargetARB.ArrayBuffer, _instanceSsbo);
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fixed (float* p = _instanceBuffer)
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_gl.BufferData(BufferTargetARB.ArrayBuffer,
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(nuint)(totalInstances * 16 * sizeof(float)), p, BufferUsageARB.DynamicDraw);
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// ── Phase 4: bind VAO once (modern rendering shares one global VAO) ──
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EnsureInstanceAttribs(anyVao);
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_gl.BindVertexArray(anyVao);
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// ── Phase 5: opaque + ClipMap pass (front-to-back sorted) ───────────
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if (string.Equals(Environment.GetEnvironmentVariable("ACDREAM_NO_CULL"), "1", StringComparison.Ordinal))
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_gl.Disable(EnableCap.CullFace);
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foreach (var grp in _opaqueDraws)
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{
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_shader.SetInt("uTranslucencyKind", (int)grp.Translucency);
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DrawGroup(grp);
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}
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// ── Phase 6: translucent pass ───────────────────────────────────────
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_gl.Enable(EnableCap.Blend);
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_gl.DepthMask(false);
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if (string.Equals(Environment.GetEnvironmentVariable("ACDREAM_NO_CULL"), "1", StringComparison.Ordinal))
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{
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_gl.Disable(EnableCap.CullFace);
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}
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else
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{
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_gl.Enable(EnableCap.CullFace);
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_gl.CullFace(TriangleFace.Back);
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_gl.FrontFace(FrontFaceDirection.Ccw);
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}
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foreach (var grp in _translucentDraws)
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{
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switch (grp.Translucency)
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{
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case TranslucencyKind.Additive:
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_gl.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.One);
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break;
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case TranslucencyKind.InvAlpha:
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_gl.BlendFunc(BlendingFactor.OneMinusSrcAlpha, BlendingFactor.SrcAlpha);
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break;
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default:
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_gl.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha);
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break;
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}
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_shader.SetInt("uTranslucencyKind", (int)grp.Translucency);
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DrawGroup(grp);
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}
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_gl.DepthMask(true);
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_gl.Disable(EnableCap.Blend);
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_gl.Disable(EnableCap.CullFace);
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_gl.BindVertexArray(0);
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if (diag)
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{
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_drawsIssued += _opaqueDraws.Count + _translucentDraws.Count;
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_instancesIssued += totalInstances;
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MaybeFlushDiag();
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}
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}
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private void DrawGroup(InstanceGroup grp)
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{
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_gl.ActiveTexture(TextureUnit.Texture0);
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_gl.BindTexture(TextureTarget.Texture2D, grp.TextureHandle);
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_gl.BindBuffer(BufferTargetARB.ElementArrayBuffer, grp.Ibo);
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// BaseInstance offsets the per-instance attribute fetches into our
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// shared instance VBO so each group reads its own slice. Requires
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// GL_ARB_base_instance (GL 4.2+); WB requires 4.3 so this is available.
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_gl.DrawElementsInstancedBaseVertexBaseInstance(
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PrimitiveType.Triangles,
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(uint)grp.IndexCount,
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DrawElementsType.UnsignedShort,
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(void*)(grp.FirstIndex * sizeof(ushort)),
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(uint)grp.InstanceCount,
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grp.BaseVertex,
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(uint)grp.FirstInstance);
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}
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private void MaybeFlushDiag()
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{
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long now = Environment.TickCount64;
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if (now - _lastLogTick > 5000)
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{
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Console.WriteLine(
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$"[WB-DIAG] entSeen={_entitiesSeen} entDrawn={_entitiesDrawn} meshMissing={_meshesMissing} drawsIssued={_drawsIssued} instances={_instancesIssued} groups={_groups.Count}");
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_entitiesSeen = _entitiesDrawn = _meshesMissing = _drawsIssued = _instancesIssued = 0;
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_lastLogTick = now;
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}
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}
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private void ClassifyBatches(
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ObjectRenderData renderData,
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ulong gfxObjId,
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Matrix4x4 model,
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WorldEntity entity,
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MeshRef meshRef,
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ulong palHash,
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AcSurfaceMetadataTable metaTable)
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{
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for (int batchIdx = 0; batchIdx < renderData.Batches.Count; batchIdx++)
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{
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var batch = renderData.Batches[batchIdx];
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TranslucencyKind translucency;
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if (metaTable.TryLookup(gfxObjId, batchIdx, out var meta))
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{
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translucency = meta.Translucency;
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}
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else
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{
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translucency = batch.IsAdditive ? TranslucencyKind.Additive
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: batch.IsTransparent ? TranslucencyKind.AlphaBlend
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: TranslucencyKind.Opaque;
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}
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uint texHandle = ResolveTexture(entity, meshRef, batch, palHash);
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if (texHandle == 0) continue;
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var key = new GroupKey(
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batch.IBO, batch.FirstIndex, (int)batch.BaseVertex,
|
||
batch.IndexCount, texHandle, translucency);
|
||
|
||
if (!_groups.TryGetValue(key, out var grp))
|
||
{
|
||
grp = new InstanceGroup
|
||
{
|
||
Ibo = batch.IBO,
|
||
FirstIndex = batch.FirstIndex,
|
||
BaseVertex = (int)batch.BaseVertex,
|
||
IndexCount = batch.IndexCount,
|
||
TextureHandle = texHandle,
|
||
Translucency = translucency,
|
||
};
|
||
_groups[key] = grp;
|
||
}
|
||
grp.Matrices.Add(model);
|
||
}
|
||
}
|
||
|
||
private uint ResolveTexture(WorldEntity entity, MeshRef meshRef, ObjectRenderBatch batch, ulong palHash)
|
||
{
|
||
// WB stores the surface id on batch.Key.SurfaceId (TextureKey struct);
|
||
// batch.SurfaceId is unset (zero) for batches built by ObjectMeshManager.
|
||
uint surfaceId = batch.Key.SurfaceId;
|
||
if (surfaceId == 0 || surfaceId == 0xFFFFFFFF) return 0;
|
||
|
||
uint overrideOrigTex = 0;
|
||
bool hasOrigTexOverride = meshRef.SurfaceOverrides is not null
|
||
&& meshRef.SurfaceOverrides.TryGetValue(surfaceId, out overrideOrigTex);
|
||
uint? origTexOverride = hasOrigTexOverride ? overrideOrigTex : (uint?)null;
|
||
|
||
if (entity.PaletteOverride is not null)
|
||
{
|
||
// perf #4: pass the entity-precomputed palette hash so TextureCache
|
||
// can skip its internal HashPaletteOverride for repeat lookups
|
||
// within the same character.
|
||
return _textures.GetOrUploadWithPaletteOverride(
|
||
surfaceId, origTexOverride, entity.PaletteOverride, palHash);
|
||
}
|
||
else if (hasOrigTexOverride)
|
||
{
|
||
return _textures.GetOrUploadWithOrigTextureOverride(surfaceId, overrideOrigTex);
|
||
}
|
||
else
|
||
{
|
||
return _textures.GetOrUpload(surfaceId);
|
||
}
|
||
}
|
||
|
||
private void EnsureInstanceAttribs(uint vao)
|
||
{
|
||
if (!_patchedVaos.Add(vao)) return;
|
||
|
||
_gl.BindVertexArray(vao);
|
||
// NOTE: temporarily binding _instanceSsbo as ArrayBuffer for compile
|
||
// compatibility. Tasks 9-10 replace with BindBufferBase(SSBO).
|
||
_gl.BindBuffer(BufferTargetARB.ArrayBuffer, _instanceSsbo);
|
||
for (uint row = 0; row < 4; row++)
|
||
{
|
||
uint loc = 3 + row;
|
||
_gl.EnableVertexAttribArray(loc);
|
||
_gl.VertexAttribPointer(loc, 4, VertexAttribPointerType.Float, false, 64, (void*)(row * 16));
|
||
_gl.VertexAttribDivisor(loc, 1);
|
||
}
|
||
}
|
||
|
||
private static void WriteMatrix(float[] buf, int offset, in Matrix4x4 m)
|
||
{
|
||
buf[offset + 0] = m.M11; buf[offset + 1] = m.M12; buf[offset + 2] = m.M13; buf[offset + 3] = m.M14;
|
||
buf[offset + 4] = m.M21; buf[offset + 5] = m.M22; buf[offset + 6] = m.M23; buf[offset + 7] = m.M24;
|
||
buf[offset + 8] = m.M31; buf[offset + 9] = m.M32; buf[offset + 10] = m.M33; buf[offset + 11] = m.M34;
|
||
buf[offset + 12] = m.M41; buf[offset + 13] = m.M42; buf[offset + 14] = m.M43; buf[offset + 15] = m.M44;
|
||
}
|
||
|
||
public void Dispose()
|
||
{
|
||
if (_disposed) return;
|
||
_disposed = true;
|
||
_gl.DeleteBuffer(_instanceSsbo);
|
||
_gl.DeleteBuffer(_batchSsbo);
|
||
_gl.DeleteBuffer(_indirectBuffer);
|
||
}
|
||
|
||
private readonly record struct GroupKey(
|
||
uint Ibo,
|
||
uint FirstIndex,
|
||
int BaseVertex,
|
||
int IndexCount,
|
||
uint TextureHandle,
|
||
TranslucencyKind Translucency);
|
||
|
||
private sealed class InstanceGroup
|
||
{
|
||
public uint Ibo;
|
||
public uint FirstIndex;
|
||
public int BaseVertex;
|
||
public int IndexCount;
|
||
public uint TextureHandle;
|
||
public TranslucencyKind Translucency;
|
||
public int FirstInstance; // offset into the shared instance VBO (in instances, not bytes)
|
||
public int InstanceCount;
|
||
public float SortDistance; // squared distance from camera to first instance, for opaque sort
|
||
public readonly List<Matrix4x4> Matrices = new();
|
||
}
|
||
}
|