140 lines
3.7 KiB
C++
140 lines
3.7 KiB
C++
/*
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* <Short Description>
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* Copyright (C) 2024 Brett Terpstra
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef BLT_WITH_GRAPHICS_OBJ_LOADER_H
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#define BLT_WITH_GRAPHICS_OBJ_LOADER_H
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#include "blt/math/vectors.h"
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#include "blt/std/hashmap.h"
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#include <utility>
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#include <vector>
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#include <string_view>
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namespace blt::gfx
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{
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typedef blt::vec3f vertex_t;
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typedef blt::vec2f uv_t;
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typedef blt::vec3f normal_t;
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class model_data
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{
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public:
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private:
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std::vector<vertex_t> vertices;
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std::vector<uv_t> uvs;
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std::vector<normal_t> normals;
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};
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struct face_t
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{
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std::int32_t vertex, uv, normal;
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};
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static inline bool operator==(const face_t& f1, const face_t& f2)
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{
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return f1.vertex == f2.vertex && f1.uv == f2.uv && f1.normal == f2.normal;
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}
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struct face_hash
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{
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size_t operator()(const face_t& face) const
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{
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std::hash<std::int32_t> hasher;
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return hasher(face.vertex) ^ hasher(face.uv) ^ hasher(face.normal);
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}
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};
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struct face_eq
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{
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bool operator()(const face_t& f1, const face_t& f2) const
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{
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return f1 == f2;
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}
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};
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struct constructed_vertex_t
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{
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vertex_t vertex;
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uv_t uv;
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normal_t normal;
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};
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struct triangle_t
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{
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std::int32_t v[3];
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};
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struct object_data
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{
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std::string object_name;
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std::vector<triangle_t> indices;
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};
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class obj_objects_t
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{
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private:
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std::vector<constructed_vertex_t> vertex_data_;
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std::vector<object_data> objects_;
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public:
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obj_objects_t(std::vector<constructed_vertex_t>&& vertex_data, std::vector<object_data>&& objects):
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vertex_data_(vertex_data), objects_(objects)
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{}
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inline const std::vector<constructed_vertex_t>& vertex_data()
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{
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return vertex_data_;
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};
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inline const std::vector<object_data>& objects()
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{
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return objects_;
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};
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};
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class char_tokenizer;
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class obj_loader
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{
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private:
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std::vector<vertex_t> vertices;
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std::vector<uv_t> uvs;
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std::vector<normal_t> normals;
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// maps between face (constructed vertex) -> vertex indices
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HASHMAP<face_t, std::int32_t, face_hash, face_eq> vertex_map;
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std::vector<constructed_vertex_t> vertex_data;
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object_data current_object;
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std::vector<object_data> data;
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private:
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bool handle_vertex_and_normals(float x, float y, float z, char type);
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void parse_extra_line(char_tokenizer& tokenizer);
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void parse_face(char_tokenizer& tokenizer);
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public:
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obj_objects_t parseFile(std::string_view file);
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};
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obj_objects_t quick_load(std::string_view file);
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}
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#endif //BLT_WITH_GRAPHICS_OBJ_LOADER_H
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