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Visual verification (Coldeve, Energy Crystal) showed acdream's Magical blue as a flat tint vs retail's gradient. Root cause: RenderIcons calls the SURFACE overload of SurfaceWindow::ReplaceColor (0x004415b0), which copies the textured effect tile pixel-by-pixel into the icon's pure-white pixels — not the flat color->color overload (0x00441530) I'd approximated with the tile's mean color. Port the surface overload exactly (dst[x,y]=src[x,y] where dst==white); confirmed via clean Ghidra decompile + named decomp. Retires AP-43 (mean-color approximation); IA-18 updated to the surface op. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
271 lines
13 KiB
C#
271 lines
13 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Numerics;
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using AcDream.App.Rendering;
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using AcDream.Core.Items;
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using AcDream.Core.Textures;
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using DatReaderWriter;
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using DatReaderWriter.DBObjs;
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namespace AcDream.App.UI;
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/// <summary>
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/// Builds an item icon by alpha-compositing its RenderSurface layers into one 32x32
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/// texture, mirroring retail IconData::RenderIcons (decomp 407524) and
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/// DBCache::GetDIDFromEnum (0x413940). Each layer is a 0x06 RenderSurface decoded
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/// DIRECTLY (the D.2b RenderSurface-vs-Surface rule).
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///
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/// Layer order (bottom → top), matching retail:
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/// 1. type-default underlay (OPAQUE backing; resolved via EnumIDMap 0x10000004 from
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/// the portal MasterMap) — <see cref="ResolveUnderlayDid"/>
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/// 2. item custom underlay (e.g. "magic" tint strip)
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/// 3. base icon
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/// 4. item custom overlay (e.g. "enchanted" sparkle)
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///
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/// The type-default underlay is the key to non-transparent filled slots: because it
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/// is fully opaque and is layer 0, <see cref="Compose"/> sizes the output to it and
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/// the alpha-over pass fills every pixel. The overlay ReplaceColor tint and the effect
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/// overlay (RenderIcons 407546) remain out of scope (paperdoll phase).
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///
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/// Composited textures are cached by their (typeUnderlay, underlay, base, overlay) tuple.
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/// </summary>
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public sealed class IconComposer
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{
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private readonly DatCollection _dats;
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private readonly TextureCache _cache;
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private readonly Dictionary<(uint, uint, uint, uint, uint), uint> _byTuple = new();
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// ── type-default underlay resolve (EnumIDMap 0x10000004) ─────────────────
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// Portal MasterMap (0x25000000) maps enum 0x10000004 → submap DID (0x25000008).
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// Submap maps index → 0x06 RenderSurface DID. index = LSB(itemType)+1, or 0x21.
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// Refs: IconData::RenderIcons 0058d214–0058d22c; DBCache::GetDIDFromEnum 0x413940.
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private EnumIDMap? _underlaySubMap;
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private bool _underlayResolveTried;
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private readonly Dictionary<uint, uint> _underlayDidByIndex = new();
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// ── effect overlay resolve (EnumIDMap 0x10000005) ────────────────────────
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// Portal MasterMap (0x25000000) maps enum 0x10000005 → submap DID (0x25000009).
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// Submap maps index → 0x06 RenderSurface DID. index = LSB(effects)+1, fallback 0x21.
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// Refs: IconData::RenderIcons 0x0058d180 (effect path); the effect tile is a
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// ReplaceColor tint SOURCE, not a blit layer (see RESOLVED doc, divergence DR-1).
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private EnumIDMap? _effectSubMap;
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private bool _effectResolveTried;
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private readonly Dictionary<uint, uint> _effectDidByIndex = new();
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private readonly Dictionary<uint, DecodedTexture> _effectTileByDid = new();
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public IconComposer(DatCollection dats, TextureCache cache)
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{
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_dats = dats;
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_cache = cache;
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}
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/// <summary>
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/// Resolve the type-default underlay DID for <paramref name="itemType"/> via the
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/// two-level EnumIDMap chain (retail: IconData::RenderIcons 0058d214–0058d22c +
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/// DBCache::GetDIDFromEnum 0x413940).
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///
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/// <para>index = LowestSetBit(itemType) + 1, or 0x21 when itemType has no bits set.</para>
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///
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/// <para>NOTE: retail RenderIcons (407546) has a special paperdoll IsThePlayer case
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/// that uses GetDIDByEnum(0x10000004, 7) + TYPE_CONTAINER for the player doll — that
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/// path is out of scope here (paperdoll phase).</para>
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/// </summary>
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internal uint ResolveUnderlayDid(ItemType itemType)
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{
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uint raw = (uint)itemType;
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int lsb = raw == 0 ? -1 : BitOperations.TrailingZeroCount(raw);
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uint index = lsb < 0 ? 0x21u : (uint)(lsb + 1);
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if (_underlayDidByIndex.TryGetValue(index, out var cached)) return cached;
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EnsureUnderlaySubMap();
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uint did = 0;
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if (_underlaySubMap is { } sub && sub.ClientEnumToID.TryGetValue(index, out var d)) did = d;
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_underlayDidByIndex[index] = did;
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return did;
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}
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private void EnsureUnderlaySubMap()
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{
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if (_underlayResolveTried) return;
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_underlayResolveTried = true;
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uint masterDid = (uint)_dats.Portal.Header.MasterMapId; // = 0x25000000
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if (masterDid == 0) return;
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if (!_dats.Portal.TryGet<EnumIDMap>(masterDid, out var master)) return;
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if (!master.ClientEnumToID.TryGetValue(0x10000004u, out var subDid)) return; // → 0x25000008
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if (_dats.Portal.TryGet<EnumIDMap>(subDid, out var sub)) _underlaySubMap = sub;
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}
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/// <summary>
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/// Resolve the effect-overlay DID for <paramref name="effects"/> via the EnumIDMap
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/// 0x10000005 chain. index = LowestSetBit(effects)+1; if the entry is missing/zero,
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/// retail falls back to index 0x21 (the solid-black tile). NOTE: the effect path has
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/// NO lsb==-1 pre-check (unlike the type underlay), so effects==0 → index 0 → miss →
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/// fallback. (Retail IconData::RenderIcons 0x0058d180.)
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/// </summary>
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internal uint ResolveEffectDid(uint effects)
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{
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int lsb = effects == 0 ? -1 : BitOperations.TrailingZeroCount(effects);
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uint index = (uint)(lsb + 1);
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if (_effectDidByIndex.TryGetValue(index, out var cached)) return cached;
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EnsureEffectSubMap();
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uint did = 0;
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if (_effectSubMap is { } sub && sub.ClientEnumToID.TryGetValue(index, out var d)) did = d;
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if (did == 0 && _effectSubMap is { } sub2 && sub2.ClientEnumToID.TryGetValue(0x21u, out var fb))
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did = fb;
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_effectDidByIndex[index] = did;
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return did;
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}
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private void EnsureEffectSubMap()
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{
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if (_effectResolveTried) return;
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_effectResolveTried = true;
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uint masterDid = (uint)_dats.Portal.Header.MasterMapId; // = 0x25000000
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if (masterDid == 0) return;
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if (!_dats.Portal.TryGet<EnumIDMap>(masterDid, out var master)) return;
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if (!master.ClientEnumToID.TryGetValue(0x10000005u, out var subDid)) return; // → 0x25000009
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if (_dats.Portal.TryGet<EnumIDMap>(subDid, out var sub)) _effectSubMap = sub;
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}
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/// <summary>
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/// Retail <c>SurfaceWindow::ReplaceColor</c> SURFACE overload (0x004415b0): for every
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/// pixel in <paramref name="dst"/> that equals pure-white-opaque (RGBAColor(1,1,1,1) →
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/// 0xFFFFFFFF), copy the SAME (x,y) pixel from the source effect tile. This preserves
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/// the effect tile's texture/gradient (NOT a flat color). Retail requires the source to
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/// cover the dest (it does — both are 32x32); out-of-range pixels are left unchanged.
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/// Mutates <paramref name="dst"/> in place.
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/// </summary>
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internal static void ReplaceWhiteFromSurface(byte[] dst, int dw, int dh, byte[] src, int sw, int sh)
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{
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for (int y = 0; y < dh; y++)
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for (int x = 0; x < dw; x++)
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{
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int di = (y * dw + x) * 4;
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if (dst[di] == 255 && dst[di + 1] == 255 && dst[di + 2] == 255 && dst[di + 3] == 255
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&& x < sw && y < sh)
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{
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int si = (y * sw + x) * 4;
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dst[di] = src[si]; dst[di + 1] = src[si + 1];
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dst[di + 2] = src[si + 2]; dst[di + 3] = src[si + 3];
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}
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}
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}
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/// <summary>
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/// The decoded effect tile for <paramref name="effects"/> (enum 0x10000005). The tile is
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/// a 32x32 textured RenderSurface whose pixels ARE the per-effect coloring (blue=Magical,
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/// green=Poisoned, …; the 0x21 fallback is solid black). Retail copies it per-pixel into
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/// the icon's white pixels (gradient), so we need the whole tile, not a representative
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/// color. Cached per DID.
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/// </summary>
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internal bool TryGetEffectTile(uint effects, out DecodedTexture tile)
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{
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tile = null!;
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uint did = ResolveEffectDid(effects);
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if (did == 0) return false;
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if (_effectTileByDid.TryGetValue(did, out var cached)) { tile = cached; return true; }
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if (!TryDecode(did, out var d)) return false;
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_effectTileByDid[did] = d;
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tile = d;
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return true;
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}
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private bool TryDecode(uint renderSurfaceId, out DecodedTexture decoded)
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{
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decoded = null!;
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if (renderSurfaceId == 0) return false;
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if (!_dats.Portal.TryGet<RenderSurface>(renderSurfaceId, out var rs) &&
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!_dats.HighRes.TryGet<RenderSurface>(renderSurfaceId, out rs))
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return false;
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decoded = SurfaceDecoder.DecodeRenderSurface(rs, palette: null);
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return true;
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}
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/// <summary>Pure alpha-over composite, bottom->top. Layers may differ in size;
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/// the result is sized to the FIRST (bottom) layer and upper layers are sampled
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/// top-left aligned (all icon layers are 32x32 in practice).</summary>
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public static (byte[] rgba, int w, int h) Compose(IReadOnlyList<(byte[] rgba, int w, int h)> layers)
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{
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if (layers.Count == 0) return (Array.Empty<byte>(), 0, 0);
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var (baseRgba, w, h) = layers[0];
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var outp = (byte[])baseRgba.Clone();
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for (int li = 1; li < layers.Count; li++)
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{
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var (src, sw, sh) = layers[li];
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int cw = Math.Min(w, sw), ch = Math.Min(h, sh);
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for (int y = 0; y < ch; y++)
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for (int x = 0; x < cw; x++)
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{
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int di = (y * w + x) * 4, si = (y * sw + x) * 4;
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float sa = src[si + 3] / 255f;
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if (sa <= 0f) continue;
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float da = 1f - sa;
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outp[di] = (byte)(src[si] * sa + outp[di] * da);
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outp[di + 1] = (byte)(src[si + 1] * sa + outp[di + 1] * da);
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outp[di + 2] = (byte)(src[si + 2] * sa + outp[di + 2] * da);
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outp[di + 3] = (byte)Math.Min(255f, src[si + 3] + outp[di + 3] * da);
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}
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}
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return (outp, w, h);
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}
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/// <summary>
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/// Resolve (and cache) the composited GL texture for an item's icon state.
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/// Returns 0 if no base icon. Mirrors retail IconData::RenderIcons (0x0058d180):
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/// a DRAG composite (base + custom overlay + effect recolor) blitted over the
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/// type-default underlay + custom underlay. The effect tile (enum 0x10000005) is a
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/// ReplaceColor tint SOURCE, not a blit layer (DR-1). The recolor runs for ALL items:
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/// effects==0 resolves to the 0x21 solid-black fallback tile, so pure-white pixels become
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/// black (matching retail); magical items take the per-effect hue instead.
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/// </summary>
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public uint GetIcon(ItemType itemType, uint iconId, uint underlayId, uint overlayId, uint effects)
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{
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if (iconId == 0) return 0;
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uint typeUnderlayDid = ResolveUnderlayDid(itemType);
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var key = (typeUnderlayDid, iconId, underlayId, overlayId, effects);
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if (_byTuple.TryGetValue(key, out var tex)) return tex;
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// Stage 1 — retail m_pDragIcon: base + custom overlay, then the effect recolor.
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var dragLayers = new List<(byte[] rgba, int w, int h)>();
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AddLayer(dragLayers, iconId);
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AddLayer(dragLayers, overlayId);
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(byte[] rgba, int w, int h)? drag = null;
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if (dragLayers.Count > 0)
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{
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var composed = Compose(dragLayers);
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// Effect recolor — ALWAYS, matching retail IconData::RenderIcons (0x0058d180):
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// the effect tile (enum 0x10000005, lsb(effects)+1, fallback 0x21) is non-null
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// even for effects==0 (the 0x21 SOLID-BLACK tile 0x060011C5). Retail's RenderIcons
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// calls the SURFACE overload of SurfaceWindow::ReplaceColor (0x004415b0), copying
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// the textured effect tile per-pixel into the icon's pure-white pixels — so
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// magical items take the tile's GRADIENT hue and mundane items go solid black.
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// (Visually confirmed against retail 2026-06-17: the Energy Crystal's blue is a
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// gradient, not a flat tint, and the no-mana scroll's edges are black.)
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if (TryGetEffectTile(effects, out var tile))
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ReplaceWhiteFromSurface(composed.rgba, composed.w, composed.h,
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tile.Rgba8, tile.Width, tile.Height);
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drag = composed;
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}
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// Stage 2 — retail m_pIcon: type-default underlay (opaque) + custom underlay + drag.
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var layers = new List<(byte[] rgba, int w, int h)>();
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AddLayer(layers, typeUnderlayDid);
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AddLayer(layers, underlayId);
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if (drag is { } d) layers.Add(d);
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if (layers.Count == 0) return 0;
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var (rgba, w, h) = Compose(layers);
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uint handle = _cache.UploadRgba8(rgba, w, h, nearest: true);
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_byTuple[key] = handle;
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return handle;
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}
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private void AddLayer(List<(byte[], int, int)> layers, uint renderSurfaceId)
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{
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if (renderSurfaceId == 0) return;
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if (!_dats.Portal.TryGet<RenderSurface>(renderSurfaceId, out var rs) &&
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!_dats.HighRes.TryGet<RenderSurface>(renderSurfaceId, out rs))
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return;
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var decoded = SurfaceDecoder.DecodeRenderSurface(rs, palette: null);
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layers.Add((decoded.Rgba8, decoded.Width, decoded.Height));
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}
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}
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