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-rw-r--r--assetFactory/assimp.cpp119
1 files changed, 119 insertions, 0 deletions
diff --git a/assetFactory/assimp.cpp b/assetFactory/assimp.cpp
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--- /dev/null
+++ b/assetFactory/assimp.cpp
@@ -0,0 +1,119 @@
+#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 <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 ScemeCPtr = std::shared_ptr<const aiScene>;
+class AssImpNode : public Shape {
+public:
+ AssImpNode(ScemeCPtr scene, const aiNode * node) : scene(std::move(scene)), node(node) { }
+
+ ScemeCPtr 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];
+
+ AssetFactory::TextureFragmentCoords tfc;
+ if (auto mf = Persistence::ParseBase::getShared<AssetFactory>("assetFactory")) {
+ aiString path;
+ m.Get(AI_MATKEY_TEXTURE_DIFFUSE(0), path);
+ tfc = mf->getTextureCoords(path.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++];
+ const auto uv = glm::mix(tfc[0], tfc[2], ouv);
+ mesh.set_texcoord2D(fheh, uv);
+ }
+ }
+ }
+ }
+};
+
+void
+AssImp::postLoad()
+{
+ ScemeCPtr 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 textures = AIRANGE(scene, Textures);
+ std::transform(textures.begin(), textures.end(),
+ std::inserter(mf->textureFragments, mf->textureFragments.end()), [](const aiTexture * t) {
+ auto texture = std::make_shared<TextureFragment>();
+ texture->id = texture->path = t->mFilename.C_Str();
+ texture->image = 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);
+}