libs/io/src/eu/io/mesh.cc
| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | #include "eu/io/mesh.h" | ||
| 2 | |||
| 3 | #include "eu/core/geom.builder.h" | ||
| 4 | |||
| 5 | #include "eu/io/file.h" | ||
| 6 | |||
| 7 | #include "cgltf.h" | ||
| 8 | |||
| 9 | namespace eu::io | ||
| 10 | { | ||
| 11 | |||
| 12 | namespace | ||
| 13 | { | ||
| 14 | |||
| 15 | struct GltfFile | ||
| 16 | { | ||
| 17 | cgltf_data* data = nullptr; | ||
| 18 | |||
| 19 | ✗ | void clear() | |
| 20 | { | ||
| 21 | ✗ | if (data == nullptr) | |
| 22 | { | ||
| 23 | ✗ | return; | |
| 24 | } | ||
| 25 | |||
| 26 | ✗ | cgltf_free(data); | |
| 27 | ✗ | data = nullptr; | |
| 28 | } | ||
| 29 | |||
| 30 | ✗ | bool load_gltf_file(const std::string& path) | |
| 31 | { | ||
| 32 | ✗ | constexpr cgltf_options options = {}; | |
| 33 | ✗ | data = nullptr; | |
| 34 | |||
| 35 | // const auto bytes = bytes_from_file(path); | ||
| 36 | |||
| 37 | ✗ | cgltf_result result = cgltf_parse_file(&options, path.c_str(), &data); | |
| 38 | // cgltf_result result = cgltf_parse(&options, bytes.data(), bytes.size(), &data); | ||
| 39 | ✗ | if (result != cgltf_result_success) | |
| 40 | { | ||
| 41 | ✗ | clear(); | |
| 42 | ✗ | LOG_ERR("Could not parse file: {}", path); | |
| 43 | ✗ | return false; | |
| 44 | } | ||
| 45 | |||
| 46 | ✗ | result = cgltf_load_buffers(&options, data, path.c_str()); | |
| 47 | ✗ | if (result != cgltf_result_success) | |
| 48 | { | ||
| 49 | ✗ | clear(); | |
| 50 | ✗ | LOG_ERR("Could not load buffers for: {}", path); | |
| 51 | ✗ | return false; | |
| 52 | } | ||
| 53 | |||
| 54 | ✗ | result = cgltf_validate(data); | |
| 55 | ✗ | if (result != cgltf_result_success) | |
| 56 | { | ||
| 57 | ✗ | clear(); | |
| 58 | ✗ | LOG_ERR("GLTF file validation FAILED: {}", path); | |
| 59 | ✗ | return false; | |
| 60 | } | ||
| 61 | ✗ | return true; | |
| 62 | } | ||
| 63 | }; | ||
| 64 | |||
| 65 | |||
| 66 | ✗ | std::optional<std::size_t> find_node_index( | |
| 67 | cgltf_node* target, cgltf_node* all_nodes, std::size_t node_count | ||
| 68 | ) | ||
| 69 | { | ||
| 70 | ✗ | if (target == nullptr) | |
| 71 | { | ||
| 72 | ✗ | return std::nullopt; | |
| 73 | } | ||
| 74 | ✗ | for (std::size_t node_index = 0; node_index < node_count; ++node_index) | |
| 75 | { | ||
| 76 | ✗ | if (target == &all_nodes[node_index]) | |
| 77 | { | ||
| 78 | ✗ | return node_index; | |
| 79 | } | ||
| 80 | } | ||
| 81 | ✗ | return std::nullopt; | |
| 82 | } | ||
| 83 | |||
| 84 | ✗ | std::vector<float> scalar_values_from_accessor( | |
| 85 | std::size_t component_count, const cgltf_accessor& accessor | ||
| 86 | ) | ||
| 87 | { | ||
| 88 | ✗ | std::vector<float> ret; | |
| 89 | ✗ | ret.resize(accessor.count * component_count); | |
| 90 | |||
| 91 | ✗ | for (cgltf_size accessor_index = 0; accessor_index < accessor.count; ++accessor_index) | |
| 92 | { | ||
| 93 | ✗ | cgltf_accessor_read_float(&accessor, accessor_index, &ret[accessor_index * component_count], component_count); | |
| 94 | } | ||
| 95 | ✗ | return ret; | |
| 96 | ✗ | } | |
| 97 | |||
| 98 | ✗ | void extract_mesh_from_attribute( | |
| 99 | core::geom::Builder& out_mesh, | ||
| 100 | cgltf_attribute& attribute, | ||
| 101 | cgltf_skin* skin, | ||
| 102 | cgltf_node* nodes, | ||
| 103 | unsigned int node_count | ||
| 104 | ) | ||
| 105 | { | ||
| 106 | ✗ | const cgltf_attribute_type attrib_type = attribute.type; | |
| 107 | ✗ | const cgltf_accessor& accessor = *attribute.data; | |
| 108 | |||
| 109 | ✗ | unsigned int component_count = 0; | |
| 110 | ✗ | if (accessor.type == cgltf_type_vec2) | |
| 111 | { | ||
| 112 | ✗ | component_count = 2; | |
| 113 | } | ||
| 114 | ✗ | else if (accessor.type == cgltf_type_vec3) | |
| 115 | { | ||
| 116 | ✗ | component_count = 3; | |
| 117 | } | ||
| 118 | ✗ | else if (accessor.type == cgltf_type_vec4) | |
| 119 | { | ||
| 120 | ✗ | component_count = 4; | |
| 121 | } | ||
| 122 | ✗ | const auto values = scalar_values_from_accessor(component_count, accessor); | |
| 123 | ✗ | const auto accessor_count = accessor.count; | |
| 124 | |||
| 125 | ✗ | for (std::size_t accessor_index = 0; accessor_index < accessor_count; ++accessor_index) | |
| 126 | { | ||
| 127 | ✗ | const auto index = accessor_index * component_count; | |
| 128 | ✗ | switch (attrib_type) | |
| 129 | { | ||
| 130 | ✗ | case cgltf_attribute_type_position: | |
| 131 | ✗ | out_mesh.add_position(v3(values[index + 0], values[index + 1], values[index + 2]) | |
| 132 | ); | ||
| 133 | ✗ | break; | |
| 134 | ✗ | case cgltf_attribute_type_texcoord: | |
| 135 | // note: eu 2d coordinate system is bottom left going up, gltf is top left going down, `1-y` fixes this | ||
| 136 | ✗ | out_mesh.add_text_coord(v2(values[index + 0], 1-values[index + 1])); | |
| 137 | ✗ | break; | |
| 138 | ✗ | case cgltf_attribute_type_weights: | |
| 139 | ✗ | out_mesh.add_weight(v4(values[index + 0], values[index + 1], values[index + 2], values[index + 3])); | |
| 140 | ✗ | break; | |
| 141 | ✗ | case cgltf_attribute_type_normal: | |
| 142 | { | ||
| 143 | ✗ | const auto normal = v3(values[index + 0], values[index + 1], values[index + 2]); | |
| 144 | ✗ | out_mesh.add_normal(normal.get_normalized().value_or(kk::up)); | |
| 145 | } | ||
| 146 | ✗ | break; | |
| 147 | ✗ | case cgltf_attribute_type_joints: | |
| 148 | { | ||
| 149 | ✗ | if (skin != nullptr) | |
| 150 | { | ||
| 151 | ✗ | const auto joint_at = [&](std::size_t joint_index) -> std::size_t | |
| 152 | { | ||
| 153 | ✗ | const auto found = std::lround(values[index + joint_index]); | |
| 154 | ✗ | const auto ret = static_cast<int>(std::max<std::size_t>( | |
| 155 | ✗ | 0, find_node_index(skin->joints[found], nodes, node_count).value_or(0) | |
| 156 | ✗ | )); | |
| 157 | ✗ | return ret; | |
| 158 | ✗ | }; | |
| 159 | ✗ | out_mesh.add_influence({joint_at(0), joint_at(1), joint_at(2), joint_at(3)}); | |
| 160 | } | ||
| 161 | else | ||
| 162 | { | ||
| 163 | ✗ | LOG_WARN("Mesh has joints but is missing skin"); | |
| 164 | } | ||
| 165 | } | ||
| 166 | ✗ | break; | |
| 167 | ✗ | default: | |
| 168 | //ignore | ||
| 169 | ✗ | break; | |
| 170 | } | ||
| 171 | } | ||
| 172 | ✗ | } | |
| 173 | |||
| 174 | ✗ | core::geom::Vertex vert(std::size_t index) | |
| 175 | { | ||
| 176 | ✗ | return core::geom::Vertex{index, index}; | |
| 177 | } | ||
| 178 | |||
| 179 | ✗ | core::Geom create_geom_from_gltf_primitive(const cgltf_data& data, const cgltf_node& node, const cgltf_primitive& prim) | |
| 180 | { | ||
| 181 | ✗ | core::geom::Builder mesh; | |
| 182 | |||
| 183 | ✗ | cgltf_node* nodes = data.nodes; | |
| 184 | ✗ | const auto node_count = data.nodes_count; | |
| 185 | |||
| 186 | ✗ | const auto attribute_count = prim.attributes_count; | |
| 187 | ✗ | for (unsigned int attribute_index = 0; attribute_index < attribute_count; ++attribute_index) | |
| 188 | { | ||
| 189 | ✗ | cgltf_attribute* attribute = &prim.attributes[attribute_index]; | |
| 190 | ✗ | extract_mesh_from_attribute( | |
| 191 | ✗ | mesh, *attribute, node.skin, nodes, static_cast<unsigned int>(node_count) | |
| 192 | ); | ||
| 193 | } | ||
| 194 | ✗ | if (prim.indices != nullptr) | |
| 195 | { | ||
| 196 | ✗ | mesh.faces.reserve(prim.indices->count / 3); | |
| 197 | ✗ | const auto index_count = prim.indices->count; | |
| 198 | |||
| 199 | ✗ | for (std::size_t index_index = 0; index_index < index_count; index_index += 3) | |
| 200 | { | ||
| 201 | ✗ | const auto a1 = cgltf_accessor_read_index(prim.indices, index_index); | |
| 202 | ✗ | const auto b2 = cgltf_accessor_read_index(prim.indices, index_index + 1); | |
| 203 | ✗ | const auto c3 = cgltf_accessor_read_index(prim.indices, index_index + 2); | |
| 204 | ✗ | mesh.add_face({ vert(a1), vert(b2), vert(c3) }); | |
| 205 | } | ||
| 206 | } | ||
| 207 | |||
| 208 | ✗ | return mesh.to_geom(); | |
| 209 | ✗ | } | |
| 210 | |||
| 211 | ✗ | m4 transform_from_node_rec(const cgltf_node& node) | |
| 212 | { | ||
| 213 | ✗ | const m4 parent = node.parent != nullptr ? transform_from_node_rec(*node.parent) : m4_identity; | |
| 214 | ✗ | const m4 translate = node.has_translation != 0 ? m4::from_translation(v3(node.translation)) : m4_identity; | |
| 215 | ✗ | const m4 rotate = node.has_rotation != 0 ? m4::from(Q(node.rotation)) : m4_identity; | |
| 216 | ✗ | const m4 scale = node.has_scale != 0 ? m4::from_scale(v3(node.scale)) : m4_identity; | |
| 217 | |||
| 218 | ✗ | const auto transform = translate * rotate * scale; | |
| 219 | ✗ | return parent * transform; | |
| 220 | } | ||
| 221 | |||
| 222 | ✗ | core::Mesh extract_meshes_from_gltf(const cgltf_data& data, const std::string& file) | |
| 223 | { | ||
| 224 | ✗ | core::Mesh result; | |
| 225 | |||
| 226 | ✗ | for (std::size_t node_index = 0; node_index < data.nodes_count; ++node_index) | |
| 227 | { | ||
| 228 | ✗ | const cgltf_node& node = data.nodes[node_index]; | |
| 229 | ✗ | if (node.mesh == nullptr) | |
| 230 | { | ||
| 231 | ✗ | continue; | |
| 232 | } | ||
| 233 | |||
| 234 | ✗ | core::TransformedMesh transform; | |
| 235 | ✗ | transform.name = node.mesh->name != nullptr ? node.mesh->name : "unnamed_mesh"; | |
| 236 | ✗ | transform.transform = transform_from_node_rec(node); | |
| 237 | |||
| 238 | ✗ | for (std::size_t primtive_index = 0; primtive_index < node.mesh->primitives_count; ++primtive_index) | |
| 239 | { | ||
| 240 | ✗ | const auto mesh = create_geom_from_gltf_primitive(data, node, node.mesh->primitives[primtive_index]); | |
| 241 | ✗ | if (mesh.faces.empty() || mesh.vertices.empty()) | |
| 242 | { | ||
| 243 | ✗ | LOG_WARN("Mesh has no mesh data in gltf file: {}", file); | |
| 244 | } | ||
| 245 | else | ||
| 246 | { | ||
| 247 | ✗ | transform.geoms.emplace_back(mesh); | |
| 248 | } | ||
| 249 | ✗ | } | |
| 250 | |||
| 251 | ✗ | result.meshes.emplace_back(std::move(transform)); | |
| 252 | ✗ | } | |
| 253 | |||
| 254 | ✗ | return result; | |
| 255 | ✗ | } | |
| 256 | |||
| 257 | ✗ | core::Mesh unable_to_load_geom() | |
| 258 | { | ||
| 259 | return | ||
| 260 | { | ||
| 261 | .meshes = { | ||
| 262 | core::TransformedMesh | ||
| 263 | { | ||
| 264 | ✗ | .name = "unable_to_load_geom", | |
| 265 | .transform = m4_identity, | ||
| 266 | .geoms = { | ||
| 267 | core::MeshGeom | ||
| 268 | { | ||
| 269 | ✗ | .geom = eu::core::geom::create_box(1.0f, 1.0f, 1.0f, core::geom::NormalsFacing::Out).to_geom() | |
| 270 | } | ||
| 271 | } | ||
| 272 | ✗ | } | |
| 273 | } | ||
| 274 | ✗ | }; | |
| 275 | ✗ | } | |
| 276 | } | ||
| 277 | |||
| 278 | ✗ | core::Mesh mesh_from_file(const std::string& file) | |
| 279 | { | ||
| 280 | ✗ | GltfFile gltf; | |
| 281 | ✗ | if (gltf.load_gltf_file(file) == false) | |
| 282 | { | ||
| 283 | ✗ | LOG_ERR("Failed to load gltf file: {}", file); | |
| 284 | ✗ | return unable_to_load_geom(); | |
| 285 | } | ||
| 286 | |||
| 287 | ✗ | const auto ret = extract_meshes_from_gltf(*gltf.data, file); | |
| 288 | ✗ | if (ret.meshes.empty()) | |
| 289 | { | ||
| 290 | ✗ | LOG_ERR("No meshes found in gltf file: {}", file); | |
| 291 | ✗ | return unable_to_load_geom(); | |
| 292 | } | ||
| 293 | |||
| 294 | ✗ | return ret; | |
| 295 | ✗ | } | |
| 296 | |||
| 297 | } | ||
| 298 | |||
| 299 |