wasm
This commit is contained in:
parent
93e553fba5
commit
765cf33069
6 changed files with 10895 additions and 11 deletions
|
|
@ -24,6 +24,41 @@ import std;
|
|||
namespace fs = std::filesystem;
|
||||
|
||||
export namespace Crafter {
|
||||
// Minimal Wavefront .mtl record. Only diffuse-map path is captured;
|
||||
// normal/specular/etc. would extend this in a backward-compatible way.
|
||||
// `mapKd` is verbatim from the file (relative to the .mtl's directory)
|
||||
// and empty if the material defined no diffuse texture.
|
||||
struct MtlMaterial {
|
||||
std::string mapKd;
|
||||
};
|
||||
|
||||
// Parse a .mtl file into { materialName → MtlMaterial }. Strips trailing
|
||||
// \r/\n/spaces on names + paths so DOS-line-ending files match the
|
||||
// `usemtl` tokens in their sibling .obj. Materials without `map_Kd`
|
||||
// are still present in the map with an empty `mapKd`.
|
||||
inline std::unordered_map<std::string, MtlMaterial> LoadMTL(fs::path path) {
|
||||
std::ifstream file(path);
|
||||
std::unordered_map<std::string, MtlMaterial> result;
|
||||
std::string current;
|
||||
std::string line;
|
||||
auto trim = [](std::string& s) {
|
||||
while (!s.empty() && (s.back() == '\r' || s.back() == '\n' || s.back() == ' ' || s.back() == '\t')) s.pop_back();
|
||||
while (!s.empty() && (s.front() == ' ' || s.front() == '\t')) s.erase(s.begin());
|
||||
};
|
||||
while (std::getline(file, line)) {
|
||||
if (line.starts_with("newmtl ")) {
|
||||
current = line.substr(7);
|
||||
trim(current);
|
||||
result.try_emplace(current);
|
||||
} else if (line.starts_with("map_Kd ") && !current.empty()) {
|
||||
std::string val = line.substr(7);
|
||||
trim(val);
|
||||
result[current].mapKd = std::move(val);
|
||||
}
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
struct __attribute__((packed)) VertexNormalTangentUVPacked {
|
||||
Vector<float, 3, 4> normal;
|
||||
Vector<float, 3, 4> tangent;
|
||||
|
|
@ -58,12 +93,12 @@ export namespace Crafter {
|
|||
char magic[4];
|
||||
file.read(magic, 4);
|
||||
if (std::memcmp(magic, MeshAssetFormat::magic, 4) != 0) {
|
||||
throw std::runtime_error("LoadCompressedMesh: bad magic on " + path.string());
|
||||
Compression::Fatal("LoadCompressedMesh: bad magic on " + path.string());
|
||||
}
|
||||
std::uint32_t version = 0;
|
||||
file.read(reinterpret_cast<char*>(&version), sizeof(version));
|
||||
if (version != MeshAssetFormat::version) {
|
||||
throw std::runtime_error("LoadCompressedMesh: unsupported version on " + path.string());
|
||||
Compression::Fatal("LoadCompressedMesh: unsupported version on " + path.string());
|
||||
}
|
||||
CompressedMeshAsset out;
|
||||
file.read(reinterpret_cast<char*>(&out.vertexCount), sizeof(out.vertexCount));
|
||||
|
|
@ -143,6 +178,136 @@ export namespace Crafter {
|
|||
return mesh;
|
||||
}
|
||||
|
||||
// Parse a .obj split by `usemtl` directives. Returns one
|
||||
// MeshAsset<T> per material group (in encounter order), each with
|
||||
// its own deduplicated vertex/index/data arrays — i.e. shared
|
||||
// vertices across materials are duplicated so each MeshAsset is
|
||||
// self-contained and can become a standalone BLAS. Dedup is
|
||||
// O(1)-per-vertex via a hash map keyed on (vIdx, vtIdx, vnIdx),
|
||||
// unlike LoadOBJ's linear-scan dedup (which is O(N²) and gets
|
||||
// pathological on Sponza-class inputs).
|
||||
//
|
||||
// Faces appearing before any `usemtl` accumulate under the empty
|
||||
// string material name; consumers can decide whether to drop them
|
||||
// or treat them as a default. Non-triangle faces are fan-triangulated
|
||||
// around their first vertex.
|
||||
static std::vector<std::pair<std::string, MeshAsset<T>>> LoadOBJSplit(fs::path path)
|
||||
requires (std::same_as<T, VertexNormalTangentUVPacked> || std::same_as<T, VertexNormalTangentUV>) {
|
||||
std::ifstream file(path);
|
||||
|
||||
std::vector<Vector<float, 3, 0>> positions;
|
||||
std::vector<Vector<float, 3, 0>> normals;
|
||||
std::vector<Vector<float, 2, 0>> uvs;
|
||||
|
||||
std::vector<std::pair<std::string, MeshAsset<T>>> result;
|
||||
std::unordered_map<std::string, std::size_t> matIndex;
|
||||
std::vector<std::unordered_map<std::uint64_t, std::uint32_t>> dedupPerMat;
|
||||
|
||||
std::size_t curMat = static_cast<std::size_t>(-1);
|
||||
|
||||
auto useMaterial = [&](std::string name) {
|
||||
while (!name.empty() && (name.back() == '\r' || name.back() == '\n' || name.back() == ' ' || name.back() == '\t')) name.pop_back();
|
||||
auto it = matIndex.find(name);
|
||||
if (it != matIndex.end()) { curMat = it->second; return; }
|
||||
matIndex.emplace(name, result.size());
|
||||
result.emplace_back(std::move(name), MeshAsset<T>{});
|
||||
dedupPerMat.emplace_back();
|
||||
curMat = result.size() - 1;
|
||||
};
|
||||
|
||||
std::string line;
|
||||
while (std::getline(file, line)) {
|
||||
if (line.starts_with("usemtl ")) {
|
||||
useMaterial(line.substr(7));
|
||||
} else if (line.starts_with("vt ")) {
|
||||
std::istringstream iss(line.substr(3));
|
||||
Vector<float, 2, 0> uv;
|
||||
iss >> uv.x >> uv.y;
|
||||
uvs.push_back(uv);
|
||||
} else if (line.starts_with("vn ")) {
|
||||
std::istringstream iss(line.substr(3));
|
||||
Vector<float, 3, 0> n;
|
||||
iss >> n.x >> n.y >> n.z;
|
||||
normals.push_back(n);
|
||||
} else if (line.starts_with("v ")) {
|
||||
std::istringstream iss(line.substr(2));
|
||||
Vector<float, 3, 3> p;
|
||||
iss >> p.x >> p.y >> p.z;
|
||||
positions.push_back(Vector<float, 3, 0>{p.x, p.y, p.z});
|
||||
} else if (line.starts_with("f ")) {
|
||||
if (curMat == static_cast<std::size_t>(-1)) useMaterial(std::string{});
|
||||
MeshAsset<T>& mesh = result[curMat].second;
|
||||
auto& dedup = dedupPerMat[curMat];
|
||||
std::istringstream iss(line.substr(2));
|
||||
std::string vg;
|
||||
std::vector<std::uint32_t> faceIndices;
|
||||
while (iss >> vg) {
|
||||
std::istringstream vss(vg);
|
||||
std::string vs, vts, vns;
|
||||
std::getline(vss, vs, '/');
|
||||
std::getline(vss, vts, '/');
|
||||
std::getline(vss, vns, '/');
|
||||
std::uint32_t vi = vs.empty() ? 0u : static_cast<std::uint32_t>(std::stoi(vs) - 1);
|
||||
std::uint32_t vti = vts.empty() ? 0u : static_cast<std::uint32_t>(std::stoi(vts) - 1);
|
||||
std::uint32_t vni = vns.empty() ? 0u : static_cast<std::uint32_t>(std::stoi(vns) - 1);
|
||||
std::uint64_t key = (static_cast<std::uint64_t>(vi) << 42)
|
||||
| (static_cast<std::uint64_t>(vti) << 21)
|
||||
| static_cast<std::uint64_t>(vni);
|
||||
if (auto it = dedup.find(key); it != dedup.end()) {
|
||||
faceIndices.push_back(it->second);
|
||||
} else {
|
||||
std::uint32_t newIdx = static_cast<std::uint32_t>(mesh.vertexes.size());
|
||||
const Vector<float, 3, 0>& p = positions[vi];
|
||||
const Vector<float, 3, 0>& n = normals[vni];
|
||||
const Vector<float, 2, 0>& uv = uvs[vti];
|
||||
mesh.vertexes.push_back(Vector<float, 3, 3>{p.x, p.y, p.z});
|
||||
mesh.datas.push_back(T{n, {0,0,0}, uv});
|
||||
dedup.emplace(key, newIdx);
|
||||
faceIndices.push_back(newIdx);
|
||||
}
|
||||
}
|
||||
for (std::size_t i = 1; i + 1 < faceIndices.size(); ++i) {
|
||||
mesh.indexes.push_back(faceIndices[0]);
|
||||
mesh.indexes.push_back(faceIndices[i]);
|
||||
mesh.indexes.push_back(faceIndices[i + 1]);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Accumulate face tangents into each vertex's tangent slot,
|
||||
// then normalize. Mirrors LoadOBJ's tangent calculation but
|
||||
// guarded against degenerate UVs (the LoadOBJ form NaNs out
|
||||
// silently — fine for the cube but blows up some Sponza tris).
|
||||
for (auto& entry : result) {
|
||||
MeshAsset<T>& mesh = entry.second;
|
||||
for (std::uint32_t i = 0; i + 2 < mesh.indexes.size(); i += 3) {
|
||||
std::uint32_t i0 = mesh.indexes[i];
|
||||
std::uint32_t i1 = mesh.indexes[i + 1];
|
||||
std::uint32_t i2 = mesh.indexes[i + 2];
|
||||
Vector<float, 3, 0> edge1 = mesh.vertexes[i1] - mesh.vertexes[i0];
|
||||
Vector<float, 3, 0> edge2 = mesh.vertexes[i2] - mesh.vertexes[i0];
|
||||
Vector<float, 2, 0> dUV1 = mesh.datas[i1].uv - mesh.datas[i0].uv;
|
||||
Vector<float, 2, 0> dUV2 = mesh.datas[i2].uv - mesh.datas[i0].uv;
|
||||
float denom = dUV1.x * dUV2.y - dUV1.y * dUV2.x;
|
||||
if (denom == 0.0f) continue;
|
||||
float f = 1.0f / denom;
|
||||
Vector<float, 3, 0> tangent;
|
||||
tangent.x = f * (dUV2.y * edge1.x - dUV1.y * edge2.x);
|
||||
tangent.y = f * (dUV2.y * edge1.y - dUV1.y * edge2.y);
|
||||
tangent.z = f * (dUV2.y * edge1.z - dUV1.y * edge2.z);
|
||||
tangent.Normalize();
|
||||
mesh.datas[i0].tangent += tangent;
|
||||
mesh.datas[i1].tangent += tangent;
|
||||
mesh.datas[i2].tangent += tangent;
|
||||
}
|
||||
for (T& v : mesh.datas) {
|
||||
v.tangent.Normalize();
|
||||
}
|
||||
}
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
static MeshAsset<T> LoadOBJ(fs::path path) requires (std::same_as<T, VertexNormalTangentUVPacked> || std::same_as<T, VertexNormalTangentUV>) {
|
||||
std::ifstream file(path);
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue