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#include "assimp.h"
#include "assetFactory.h"
#include "collections.h"
#include "resource.h"
#include <assimp/cimport.h>
#include <assimp/postprocess.h>
#include <assimp/scene.h>
#include <format>
#include <stb/stb_image.h>
template<typename T>
glm::vec<3, T>
operator*(const aiVector3t<T> & v)
{
return {v.x, v.y, v.z};
}
template<typename T>
glm::vec<2, T>
operator!(const aiVector3t<T> & v)
{
return {v.x, v.y};
}
#define AIRANGE(parent, member) \
std::span \
{ \
(parent)->m##member, (parent)->mNum##member \
}
using SceneCPtr = std::shared_ptr<const aiScene>;
class AssImpNode : public Shape {
public:
AssImpNode(SceneCPtr scene, const aiNode * node) : scene(std::move(scene)), node(node) { }
SceneCPtr scene;
const aiNode * node;
CreatedFaces
createMesh(ModelFactoryMesh & mesh, Scale3D) const override
{
CreatedFaces faces;
addMesh(faces, mesh, node);
return faces;
}
void
addMesh(CreatedFaces & faces, ModelFactoryMesh & mesh, const aiNode * node) const
{
for (const auto & m : AIRANGE(node, Meshes)) {
addMesh(faces, mesh, scene->mMeshes[m]);
}
for (const auto & n : AIRANGE(node, Children)) {
addMesh(faces, mesh, n);
}
}
void
addMesh(CreatedFaces & faces, ModelFactoryMesh & mesh, const aiMesh * amesh) const
{
mesh.normalsProvidedProperty = amesh->HasNormals();
const auto vhs = AIRANGE(amesh, Vertices) *
[&mesh, normals = amesh->HasNormals() ? amesh->mNormals : nullptr](auto && v) mutable {
const auto vh = mesh.add_vertex(*v);
if (normals) {
mesh.set_normal(vh, **(normals++));
}
return vh;
};
const auto & m = scene->mMaterials[amesh->mMaterialIndex]->GetName();
GLuint material {};
if (auto mf = Persistence::ParseBase::getShared<AssetFactory>("assetFactory")) {
material = mf->getMaterialIndex(m.C_Str());
}
for (const auto & f : AIRANGE(amesh, Faces)) {
const auto fvhs = AIRANGE(&f, Indices) * [&vhs](auto && i) {
return vhs[i];
};
const auto fh = faces.emplace(mesh.add_namedFace(amesh->mName.C_Str(), fvhs))->second;
if (amesh->HasTextureCoords(0)) {
for (auto idx = f.mIndices; const auto fheh : mesh.fh_range(fh)) {
const auto ouv = !amesh->mTextureCoords[0][*idx++];
mesh.set_texcoord2D(fheh, ouv);
}
mesh.property(mesh.materialFaceProperty, fh) = material;
}
}
}
};
static_assert(TextureOptions::MapMode::Repeat == static_cast<TextureOptions::MapMode>(aiTextureMapMode_Wrap));
static_assert(TextureOptions::MapMode::Clamp == static_cast<TextureOptions::MapMode>(aiTextureMapMode_Clamp));
static_assert(TextureOptions::MapMode::Decal == static_cast<TextureOptions::MapMode>(aiTextureMapMode_Decal));
static_assert(TextureOptions::MapMode::Mirror == static_cast<TextureOptions::MapMode>(aiTextureMapMode_Mirror));
void
AssImp::postLoad()
{
SceneCPtr scene {
aiImportFile(Resource::mapPath(path).c_str(), aiProcess_RemoveRedundantMaterials), &aiReleaseImport};
if (!scene) {
throw std::runtime_error(std::format("Failed to load asset library: {}", path));
}
if (auto mf = Persistence::ParseBase::getShared<AssetFactory>("assetFactory")) {
const auto root = AIRANGE(scene->mRootNode, Children);
std::transform(
root.begin(), root.end(), std::inserter(mf->shapes, mf->shapes.end()), [&scene](const aiNode * m) {
return AssetFactory::Shapes::value_type {m->mName.C_Str(), std::make_shared<AssImpNode>(scene, m)};
});
const auto materials = AIRANGE(scene, Materials);
std::transform(materials.begin(), materials.end(),
std::inserter(mf->textureFragments, mf->textureFragments.end()), [&scene](const aiMaterial * m) {
aiString path;
m->Get(AI_MATKEY_TEXTURE_DIFFUSE(0), path);
auto texture = std::make_shared<TextureFragment>();
texture->id = m->GetName().C_Str();
texture->path = path.C_Str();
m->Get(AI_MATKEY_MAPPINGMODE_U_DIFFUSE(0), texture->mapmodeU);
m->Get(AI_MATKEY_MAPPINGMODE_V_DIFFUSE(0), texture->mapmodeV);
texture->image = Worker::addWork([t = scene->GetEmbeddedTexture(path.C_Str())]() {
return std::make_unique<Image>(
std::span {reinterpret_cast<unsigned char *>(t->pcData), t->mWidth}, STBI_rgb_alpha);
});
return AssetFactory::TextureFragments::value_type {texture->id, texture};
});
}
}
bool
AssImp::persist(Persistence::PersistenceStore & store)
{
return STORE_TYPE && STORE_MEMBER(path);
}
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