497 lines
No EOL
22 KiB
C++
497 lines
No EOL
22 KiB
C++
/*
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Crafter®.Asset
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Copyright (C) 2026 Catcrafts®
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catcrafts.net
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License version 3.0 as published by the Free Software Foundation;
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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export module Crafter.Asset:Mesh;
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import :Compression;
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import Crafter.Math;
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import std;
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namespace fs = std::filesystem;
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export namespace Crafter {
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// Minimal Wavefront .mtl record. Only diffuse-map path is captured;
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// normal/specular/etc. would extend this in a backward-compatible way.
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// `mapKd` is verbatim from the file (relative to the .mtl's directory)
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// and empty if the material defined no diffuse texture.
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struct MtlMaterial {
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std::string mapKd;
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};
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// Parse a .mtl file into { materialName → MtlMaterial }. Strips trailing
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// \r/\n/spaces on names + paths so DOS-line-ending files match the
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// `usemtl` tokens in their sibling .obj. Materials without `map_Kd`
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// are still present in the map with an empty `mapKd`.
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inline std::unordered_map<std::string, MtlMaterial> LoadMTL(fs::path path) {
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std::ifstream file(path);
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std::unordered_map<std::string, MtlMaterial> result;
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std::string current;
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std::string line;
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auto trim = [](std::string& s) {
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while (!s.empty() && (s.back() == '\r' || s.back() == '\n' || s.back() == ' ' || s.back() == '\t')) s.pop_back();
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while (!s.empty() && (s.front() == ' ' || s.front() == '\t')) s.erase(s.begin());
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};
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while (std::getline(file, line)) {
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if (line.starts_with("newmtl ")) {
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current = line.substr(7);
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trim(current);
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result.try_emplace(current);
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} else if (line.starts_with("map_Kd ") && !current.empty()) {
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std::string val = line.substr(7);
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trim(val);
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result[current].mapKd = std::move(val);
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}
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}
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return result;
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}
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struct __attribute__((packed)) VertexNormalTangentUVPacked {
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Vector<float, 3, 4> normal;
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Vector<float, 3, 4> tangent;
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Vector<float, 2, 4> uv;
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};
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struct VertexNormalTangentUV {
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Vector<float, 3, 0> normal;
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Vector<float, 3, 0> tangent;
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Vector<float, 2, 0> uv;
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};
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// GDeflate-compressed counterpart of MeshAsset<T>::Save output. Three
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// regions: [vertex, index, data]. dataCount==0 leaves the data region
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// empty (zero compressedSize/decompressedSize). dataStride records sizeof(T)
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// at compress time so consumers can validate.
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struct CompressedMeshAsset {
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std::uint32_t vertexCount = 0;
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std::uint32_t indexCount = 0;
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std::uint32_t dataCount = 0;
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std::uint32_t dataStride = 0;
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Compression::CompressedBlob blob;
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};
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namespace MeshAssetFormat {
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inline constexpr char magic[4] = {'C', 'G', 'D', 'M'};
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inline constexpr std::uint32_t version = 1;
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}
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inline CompressedMeshAsset LoadCompressedMesh(fs::path path) {
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std::ifstream file(path, std::ios::binary);
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char magic[4];
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file.read(magic, 4);
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if (std::memcmp(magic, MeshAssetFormat::magic, 4) != 0) {
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Compression::Fatal("LoadCompressedMesh: bad magic on " + path.string());
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}
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std::uint32_t version = 0;
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file.read(reinterpret_cast<char*>(&version), sizeof(version));
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if (version != MeshAssetFormat::version) {
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Compression::Fatal("LoadCompressedMesh: unsupported version on " + path.string());
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}
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CompressedMeshAsset out;
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file.read(reinterpret_cast<char*>(&out.vertexCount), sizeof(out.vertexCount));
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file.read(reinterpret_cast<char*>(&out.indexCount), sizeof(out.indexCount));
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file.read(reinterpret_cast<char*>(&out.dataCount), sizeof(out.dataCount));
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file.read(reinterpret_cast<char*>(&out.dataStride), sizeof(out.dataStride));
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out.blob = Compression::ReadBlob(file);
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return out;
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}
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template <typename T>
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struct MeshAsset {
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std::vector<Vector<float, 3, 3>> vertexes;
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std::vector<std::uint32_t> indexes;
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std::vector<T> datas;
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void Save(fs::path path) {
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std::ofstream file(path, std::ios::binary);
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std::uint32_t vertexCount = vertexes.size();
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std::uint32_t indexCount = indexes.size();
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std::uint32_t dataCount = datas.size();
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file.write(reinterpret_cast<char*>(&vertexCount), sizeof(vertexCount));
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file.write(reinterpret_cast<char*>(&indexCount), sizeof(indexCount));
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file.write(reinterpret_cast<char*>(&dataCount), sizeof(dataCount));
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file.write(reinterpret_cast<char*>(vertexes.data()), vertexCount * sizeof(Vector<float, 3, 3>));
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file.write(reinterpret_cast<char*>(indexes.data()), indexCount * sizeof(std::uint32_t));
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file.write(reinterpret_cast<char*>(datas.data()), dataCount * sizeof(T));
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}
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void SaveCompressed(fs::path path) const {
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std::array<std::span<const std::byte>, 3> streams = {
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std::as_bytes(std::span(vertexes)),
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std::as_bytes(std::span(indexes)),
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std::as_bytes(std::span(datas)),
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};
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Compression::CompressedBlob blob = Compression::CompressStreams(streams);
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std::ofstream file(path, std::ios::binary);
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file.write(MeshAssetFormat::magic, 4);
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std::uint32_t version = MeshAssetFormat::version;
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std::uint32_t vc = static_cast<std::uint32_t>(vertexes.size());
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std::uint32_t ic = static_cast<std::uint32_t>(indexes.size());
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std::uint32_t dc = static_cast<std::uint32_t>(datas.size());
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std::uint32_t stride = static_cast<std::uint32_t>(sizeof(T));
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file.write(reinterpret_cast<const char*>(&version), sizeof(version));
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file.write(reinterpret_cast<const char*>(&vc), sizeof(vc));
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file.write(reinterpret_cast<const char*>(&ic), sizeof(ic));
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file.write(reinterpret_cast<const char*>(&dc), sizeof(dc));
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file.write(reinterpret_cast<const char*>(&stride), sizeof(stride));
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Compression::WriteBlob(file, blob);
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}
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static MeshAsset<T> Load(fs::path path) {
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MeshAsset<T> mesh;
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std::ifstream file(path, std::ios::binary);
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std::uint32_t vertexCount = 0;
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std::uint32_t indexCount = 0;
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std::uint32_t dataCount = 0;
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file.read(reinterpret_cast<char*>(&vertexCount), sizeof(vertexCount));
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file.read(reinterpret_cast<char*>(&indexCount), sizeof(indexCount));
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file.read(reinterpret_cast<char*>(&dataCount), sizeof(dataCount));
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mesh.vertexes.resize(vertexCount);
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mesh.indexes.resize(indexCount);
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mesh.datas.resize(dataCount);
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file.read(reinterpret_cast<char*>(mesh.vertexes.data()), vertexCount * sizeof(Vector<float, 3, 3>));
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file.read(reinterpret_cast<char*>(mesh.indexes.data()), indexCount * sizeof(std::uint32_t));
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file.read(reinterpret_cast<char*>(mesh.datas.data()), dataCount * sizeof(T));
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return mesh;
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}
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// Parse a .obj split by `usemtl` directives. Returns one
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// MeshAsset<T> per material group (in encounter order), each with
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// its own deduplicated vertex/index/data arrays — i.e. shared
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// vertices across materials are duplicated so each MeshAsset is
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// self-contained and can become a standalone BLAS. Dedup is
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// O(1)-per-vertex via a hash map keyed on (vIdx, vtIdx, vnIdx),
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// unlike LoadOBJ's linear-scan dedup (which is O(N²) and gets
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// pathological on Sponza-class inputs).
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//
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// Faces appearing before any `usemtl` accumulate under the empty
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// string material name; consumers can decide whether to drop them
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// or treat them as a default. Non-triangle faces are fan-triangulated
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// around their first vertex.
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static std::vector<std::pair<std::string, MeshAsset<T>>> LoadOBJSplit(fs::path path)
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requires (std::same_as<T, VertexNormalTangentUVPacked> || std::same_as<T, VertexNormalTangentUV>) {
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std::ifstream file(path);
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std::vector<Vector<float, 3, 0>> positions;
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std::vector<Vector<float, 3, 0>> normals;
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std::vector<Vector<float, 2, 0>> uvs;
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std::vector<std::pair<std::string, MeshAsset<T>>> result;
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std::unordered_map<std::string, std::size_t> matIndex;
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std::vector<std::unordered_map<std::uint64_t, std::uint32_t>> dedupPerMat;
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std::size_t curMat = static_cast<std::size_t>(-1);
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auto useMaterial = [&](std::string name) {
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while (!name.empty() && (name.back() == '\r' || name.back() == '\n' || name.back() == ' ' || name.back() == '\t')) name.pop_back();
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auto it = matIndex.find(name);
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if (it != matIndex.end()) { curMat = it->second; return; }
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matIndex.emplace(name, result.size());
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result.emplace_back(std::move(name), MeshAsset<T>{});
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dedupPerMat.emplace_back();
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curMat = result.size() - 1;
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};
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std::string line;
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while (std::getline(file, line)) {
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if (line.starts_with("usemtl ")) {
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useMaterial(line.substr(7));
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} else if (line.starts_with("vt ")) {
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std::istringstream iss(line.substr(3));
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Vector<float, 2, 0> uv;
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iss >> uv.x >> uv.y;
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uvs.push_back(uv);
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} else if (line.starts_with("vn ")) {
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std::istringstream iss(line.substr(3));
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Vector<float, 3, 0> n;
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iss >> n.x >> n.y >> n.z;
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normals.push_back(n);
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} else if (line.starts_with("v ")) {
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std::istringstream iss(line.substr(2));
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Vector<float, 3, 3> p;
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iss >> p.x >> p.y >> p.z;
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positions.push_back(Vector<float, 3, 0>{p.x, p.y, p.z});
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} else if (line.starts_with("f ")) {
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if (curMat == static_cast<std::size_t>(-1)) useMaterial(std::string{});
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MeshAsset<T>& mesh = result[curMat].second;
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auto& dedup = dedupPerMat[curMat];
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std::istringstream iss(line.substr(2));
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std::string vg;
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std::vector<std::uint32_t> faceIndices;
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while (iss >> vg) {
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std::istringstream vss(vg);
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std::string vs, vts, vns;
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std::getline(vss, vs, '/');
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std::getline(vss, vts, '/');
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std::getline(vss, vns, '/');
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std::uint32_t vi = vs.empty() ? 0u : static_cast<std::uint32_t>(std::stoi(vs) - 1);
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std::uint32_t vti = vts.empty() ? 0u : static_cast<std::uint32_t>(std::stoi(vts) - 1);
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std::uint32_t vni = vns.empty() ? 0u : static_cast<std::uint32_t>(std::stoi(vns) - 1);
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std::uint64_t key = (static_cast<std::uint64_t>(vi) << 42)
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| (static_cast<std::uint64_t>(vti) << 21)
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| static_cast<std::uint64_t>(vni);
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if (auto it = dedup.find(key); it != dedup.end()) {
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faceIndices.push_back(it->second);
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} else {
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std::uint32_t newIdx = static_cast<std::uint32_t>(mesh.vertexes.size());
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const Vector<float, 3, 0>& p = positions[vi];
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const Vector<float, 3, 0>& n = normals[vni];
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const Vector<float, 2, 0>& uv = uvs[vti];
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mesh.vertexes.push_back(Vector<float, 3, 3>{p.x, p.y, p.z});
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mesh.datas.push_back(T{n, {0,0,0}, uv});
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dedup.emplace(key, newIdx);
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faceIndices.push_back(newIdx);
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}
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}
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for (std::size_t i = 1; i + 1 < faceIndices.size(); ++i) {
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mesh.indexes.push_back(faceIndices[0]);
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mesh.indexes.push_back(faceIndices[i]);
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mesh.indexes.push_back(faceIndices[i + 1]);
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}
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}
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}
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// Accumulate face tangents into each vertex's tangent slot,
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// then normalize. Mirrors LoadOBJ's tangent calculation but
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// guarded against degenerate UVs (the LoadOBJ form NaNs out
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// silently — fine for the cube but blows up some Sponza tris).
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for (auto& entry : result) {
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MeshAsset<T>& mesh = entry.second;
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for (std::uint32_t i = 0; i + 2 < mesh.indexes.size(); i += 3) {
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std::uint32_t i0 = mesh.indexes[i];
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std::uint32_t i1 = mesh.indexes[i + 1];
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std::uint32_t i2 = mesh.indexes[i + 2];
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Vector<float, 3, 0> edge1 = mesh.vertexes[i1] - mesh.vertexes[i0];
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Vector<float, 3, 0> edge2 = mesh.vertexes[i2] - mesh.vertexes[i0];
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Vector<float, 2, 0> dUV1 = mesh.datas[i1].uv - mesh.datas[i0].uv;
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Vector<float, 2, 0> dUV2 = mesh.datas[i2].uv - mesh.datas[i0].uv;
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float denom = dUV1.x * dUV2.y - dUV1.y * dUV2.x;
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if (denom == 0.0f) continue;
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float f = 1.0f / denom;
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Vector<float, 3, 0> tangent;
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tangent.x = f * (dUV2.y * edge1.x - dUV1.y * edge2.x);
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tangent.y = f * (dUV2.y * edge1.y - dUV1.y * edge2.y);
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tangent.z = f * (dUV2.y * edge1.z - dUV1.y * edge2.z);
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tangent.Normalize();
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mesh.datas[i0].tangent += tangent;
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mesh.datas[i1].tangent += tangent;
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mesh.datas[i2].tangent += tangent;
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}
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for (T& v : mesh.datas) {
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v.tangent.Normalize();
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}
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}
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return result;
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}
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static MeshAsset<T> LoadOBJ(fs::path path) requires (std::same_as<T, VertexNormalTangentUVPacked> || std::same_as<T, VertexNormalTangentUV>) {
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std::ifstream file(path);
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MeshAsset<T> mesh;
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std::string line;
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std::vector<Vector<float, 3, 0>> positions;
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std::vector<Vector<float, 3, 0>> normals;
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std::vector<Vector<float, 2, 0>> uvs;
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while (std::getline(file, line)) {
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if (line.substr(0, 2) == "vt") {
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std::istringstream iss(line.substr(3));
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Vector<float,2, 0> uv;
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iss >> uv.x >> uv.y;
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uvs.push_back(uv);
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} else if (line.substr(0, 2) == "vn") {
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std::istringstream iss(line.substr(3));
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Vector<float, 3, 0> normal;
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iss >> normal.x >> normal.y >> normal.z;
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normals.push_back(normal);
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} else if (line.substr(0, 1) == "v") {
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std::istringstream iss(line.substr(2));
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Vector<float,3, 3> position;
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iss >> position.x >> position.y >> position.z;
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positions.push_back(position);
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} else if (line.substr(0, 1) == "f") {
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std::istringstream iss(line.substr(2));
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std::string vertexGroup;
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while (iss >> vertexGroup) {
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std::istringstream vss(vertexGroup);
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std::string vIndex, vtIndex, vnIndex;
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std::getline(vss, vIndex, '/');
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std::getline(vss, vtIndex, '/');
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std::getline(vss, vnIndex, '/');
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Vector<float, 3, 0> v = positions[std::stoi(vIndex) - 1];
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Vector<float, 2, 0> vt = uvs[std::stoi(vtIndex) - 1];
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Vector<float, 3, 0> vn = normals[std::stoi(vnIndex) - 1];
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for (std::uint32_t i = 0; i < mesh.datas.size(); i++) {
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if (mesh.datas[i].normal == vn && mesh.datas[i].uv == vt && mesh.vertexes[i] == v) {
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mesh.indexes.push_back(i);
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goto skip;
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}
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}
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mesh.indexes.push_back(mesh.datas.size());
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mesh.datas.push_back({vn, {0,0,0}, vt});
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mesh.vertexes.push_back(v);
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skip:;
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}
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}
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}
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// Accumulate face normals and tangents
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for (std::uint32_t i = 0; i < mesh.indexes.size(); i += 3)
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{
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std::uint32_t i0 = mesh.indexes[i];
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std::uint32_t i1 = mesh.indexes[i + 1];
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std::uint32_t i2 = mesh.indexes[i + 2];
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// Edges of the triangle
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Vector<float, 3, 0> edge1 = mesh.vertexes[i1] - mesh.vertexes[i0];
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Vector<float, 3, 0> edge2 = mesh.vertexes[i2] - mesh.vertexes[i0];
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// Texture coordinate deltas
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Vector<float, 2, 0> deltaUV1 = mesh.datas[i1].uv - mesh.datas[i0].uv;
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Vector<float, 2, 0> deltaUV2 = mesh.datas[i2].uv - mesh.datas[i0].uv;
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// Tangent calculation
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float f = 1.0f / (deltaUV1.x * deltaUV2.y - deltaUV1.y * deltaUV2.x);
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Vector<float, 3, 0> tangent;
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tangent.x = f * (deltaUV2.y * edge1.x - deltaUV1.y * edge2.x);
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tangent.y = f * (deltaUV2.y * edge1.y - deltaUV1.y * edge2.y);
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tangent.z = f * (deltaUV2.y * edge1.z - deltaUV1.y * edge2.z);
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// Normalize tangent
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tangent.Normalize();
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// Accumulate normals and tangents for each vertex
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mesh.datas[i0].tangent += tangent;
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mesh.datas[i1].tangent += tangent;
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mesh.datas[i2].tangent += tangent;
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}
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// Normalize vertex normals and tangents
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for (T& v : mesh.datas) {
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v.tangent.Normalize();
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}
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return mesh;
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}
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};
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template <>
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struct MeshAsset<void> {
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std::vector<Vector<float, 3, 3>> vertexes;
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std::vector<std::uint32_t> indexes;
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void Save(fs::path path) {
|
|
std::ofstream file(path, std::ios::binary);
|
|
|
|
std::uint32_t vertexCount = vertexes.size();
|
|
std::uint32_t indexCount = indexes.size();
|
|
|
|
file.write(reinterpret_cast<char*>(&vertexCount), sizeof(vertexCount));
|
|
file.write(reinterpret_cast<char*>(&indexCount), sizeof(indexCount));
|
|
|
|
file.write(reinterpret_cast<char*>(vertexes.data()), vertexCount * sizeof(Vector<float, 3, 3>));
|
|
file.write(reinterpret_cast<char*>(indexes.data()), indexCount * sizeof(std::uint32_t));
|
|
}
|
|
|
|
void SaveCompressed(fs::path path) const {
|
|
// Three regions to keep file format identical to the templated
|
|
// variant; the data region is empty (skipped on the GPU path).
|
|
std::array<std::span<const std::byte>, 3> streams = {
|
|
std::as_bytes(std::span(vertexes)),
|
|
std::as_bytes(std::span(indexes)),
|
|
std::span<const std::byte>{},
|
|
};
|
|
Compression::CompressedBlob blob = Compression::CompressStreams(streams);
|
|
|
|
std::ofstream file(path, std::ios::binary);
|
|
file.write(MeshAssetFormat::magic, 4);
|
|
std::uint32_t version = MeshAssetFormat::version;
|
|
std::uint32_t vc = static_cast<std::uint32_t>(vertexes.size());
|
|
std::uint32_t ic = static_cast<std::uint32_t>(indexes.size());
|
|
std::uint32_t dc = 0;
|
|
std::uint32_t stride = 0;
|
|
file.write(reinterpret_cast<const char*>(&version), sizeof(version));
|
|
file.write(reinterpret_cast<const char*>(&vc), sizeof(vc));
|
|
file.write(reinterpret_cast<const char*>(&ic), sizeof(ic));
|
|
file.write(reinterpret_cast<const char*>(&dc), sizeof(dc));
|
|
file.write(reinterpret_cast<const char*>(&stride), sizeof(stride));
|
|
Compression::WriteBlob(file, blob);
|
|
}
|
|
|
|
static MeshAsset<void> Load(fs::path path) {
|
|
MeshAsset<void> mesh;
|
|
|
|
std::ifstream file(path, std::ios::binary);
|
|
|
|
std::uint32_t vertexCount = 0;
|
|
std::uint32_t indexCount = 0;
|
|
|
|
file.read(reinterpret_cast<char*>(&vertexCount), sizeof(vertexCount));
|
|
file.read(reinterpret_cast<char*>(&indexCount), sizeof(indexCount));
|
|
|
|
mesh.vertexes.resize(vertexCount);
|
|
mesh.indexes.resize(indexCount);
|
|
|
|
file.read(reinterpret_cast<char*>(mesh.vertexes.data()), vertexCount * sizeof(Vector<float, 3, 3>));
|
|
file.read(reinterpret_cast<char*>(mesh.indexes.data()), indexCount * sizeof(std::uint32_t));
|
|
|
|
return mesh;
|
|
}
|
|
static MeshAsset<void> LoadOBJ(fs::path path) {
|
|
std::ifstream file(path);
|
|
|
|
MeshAsset<void> mesh;
|
|
|
|
std::string line;
|
|
|
|
while (std::getline(file, line)) {
|
|
if (line.rfind("v ", 0) == 0) {
|
|
std::istringstream iss(line.substr(2));
|
|
Vector<float,3, 3> position;
|
|
iss >> position.x >> position.y >> position.z;
|
|
mesh.vertexes.push_back(position);
|
|
} else if (line.rfind("f ", 0) == 0) {
|
|
std::istringstream iss(line.substr(2));
|
|
std::string vertexGroup;
|
|
|
|
while (iss >> vertexGroup) {
|
|
mesh.indexes.push_back(std::stoi(vertexGroup) - 1);
|
|
}
|
|
}
|
|
}
|
|
|
|
return mesh;
|
|
}
|
|
};
|
|
} |