1 files changed, 130 insertions, 0 deletions
diff --git a/assetFactory/assimp.cpp b/assetFactory/assimp.cpp
new file mode 100644
index 0000000..840c5a9
--- /dev/null
+++ b/assetFactory/assimp.cpp
@@ -0,0 +1,130 @@
+#include "assimp.h"
+#include "assetFactory.h"
+#include "collections.hpp"
+#include "ptr.hpp"
+#include "resource.h"
+#include <assimp/cimport.h>
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <future>
+#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, float) const
+	{
+		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
+	{
+		const auto vhs = AIRANGE(amesh, Vertices) * [&mesh](auto && v) {
+			return mesh.add_vertex(*v);
+		};
+		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("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);
+}