💿🐜 Antkeeper source code
https://antkeeper.com
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531 lines
16 KiB
531 lines
16 KiB
/*
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* Copyright (C) 2021 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code 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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* Antkeeper source code 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 Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "resources/resource-loader.hpp"
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#include "resources/resource-manager.hpp"
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#include "renderer/model.hpp"
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#include "renderer/vertex-attributes.hpp"
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#include "gl/vertex-attribute-type.hpp"
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#include "gl/drawing-mode.hpp"
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#include "utility/fundamental-types.hpp"
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#include <sstream>
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#include <stdexcept>
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#include <limits>
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#include <physfs.h>
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#include <iostream>
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#include <nlohmann/json.hpp>
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static const float3 barycentric_coords[3] =
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{
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float3{1, 0, 0},
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float3{0, 1, 0},
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float3{0, 0, 1}
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};
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/*
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template <>
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model* resource_loader<model>::load(resource_manager* resource_manager, PHYSFS_File* file)
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{
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std::string line;
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std::vector<float3> positions;
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std::vector<float2> uvs;
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std::vector<float3> normals;
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std::vector<float3> tangents;
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std::vector<float3> bitangents;
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std::vector<std::vector<std::size_t>> faces;
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std::vector<material_group> material_groups;
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material_group* current_material_group = nullptr;
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aabb<float> bounds =
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{
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{std::numeric_limits<float>::infinity(), std::numeric_limits<float>::infinity(), std::numeric_limits<float>::infinity()},
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{-std::numeric_limits<float>::infinity(), -std::numeric_limits<float>::infinity(), -std::numeric_limits<float>::infinity()}
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};
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while (!PHYSFS_eof(file))
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{
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// Read line
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physfs_getline(file, line);
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// Tokenize line
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std::vector<std::string> tokens;
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std::string token;
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std::istringstream linestream(line);
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while (linestream >> token)
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tokens.push_back(token);
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// Skip empty lines and comments
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if (tokens.empty() || tokens[0][0] == '#')
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continue;
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if (tokens[0] == "v")
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{
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if (tokens.size() != 4)
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{
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std::stringstream stream;
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stream << "resource_loader<mesh>::load(): Invalid line \"" << line << "\"" << std::endl;
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throw std::runtime_error(stream.str());
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}
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float3 position;
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std::stringstream(tokens[1]) >> position[0];
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std::stringstream(tokens[2]) >> position[1];
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std::stringstream(tokens[3]) >> position[2];
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positions.push_back(position);
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// Add position to bounds
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for (int i = 0; i < 3; ++i)
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{
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bounds.min_point[i] = std::min<float>(bounds.min_point[i], position[i]);
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bounds.max_point[i] = std::max<float>(bounds.max_point[i], position[i]);
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}
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}
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else if (tokens[0] == "vt")
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{
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if (tokens.size() != 3)
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{
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std::stringstream stream;
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stream << "resource_loader<mesh>::load(): Invalid line \"" << line << "\"" << std::endl;
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throw std::runtime_error(stream.str());
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}
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float2 uv;
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std::stringstream(tokens[1]) >> uv[0];
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std::stringstream(tokens[2]) >> uv[1];
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uvs.push_back(uv);
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}
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else if (tokens[0] == "vn")
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{
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if (tokens.size() != 4)
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{
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std::stringstream stream;
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stream << "resource_loader<mesh>::load(): Invalid line \"" << line << "\"" << std::endl;
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throw std::runtime_error(stream.str());
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}
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float3 normal;
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std::stringstream(tokens[1]) >> normal[0];
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std::stringstream(tokens[2]) >> normal[1];
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std::stringstream(tokens[3]) >> normal[2];
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normals.push_back(normal);
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}
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else if (tokens[0] == "f")
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{
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if (tokens.size() != 4)
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{
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std::stringstream stream;
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stream << "resource_loader<mesh>::load(): Invalid line \"" << line << "\"" << std::endl;
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throw std::runtime_error(stream.str());
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}
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std::vector<std::size_t> face;
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for (std::size_t i = 0; i < 3; ++i)
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{
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std::stringstream ss(tokens[i + 1]);
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while (ss.good())
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{
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std::string substring;
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std::getline(ss, substring, '/');
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if (!substring.empty())
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{
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std::size_t index = std::stoul(substring) - 1;
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face.push_back(index);
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}
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}
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}
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faces.push_back(face);
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}
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else if (tokens[0] == "usemtl")
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{
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if (tokens.size() != 2)
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{
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std::stringstream stream;
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stream << "resource_loader<mesh>::load(): Invalid line \"" << line << "\"" << std::endl;
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throw std::runtime_error(stream.str());
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}
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if (current_material_group)
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{
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current_material_group->index_count = faces.size() * 3 - current_material_group->start_index;
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}
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material_groups.push_back(material_group());
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current_material_group = &material_groups.back();
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current_material_group->name = tokens[1];
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current_material_group->start_index = faces.size() * 3;
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current_material_group->index_count = 0;
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}
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}
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if (current_material_group)
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{
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current_material_group->index_count = faces.size() * 3 - current_material_group->start_index;
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}
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// Load material group materials
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for (material_group& material_group: material_groups)
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{
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material_group.material = resource_manager->load<material>(material_group.name + ".mtl");
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}
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bool has_uvs = (!uvs.empty());
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bool has_normals = (!normals.empty());
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bool has_tangents = (has_uvs && has_normals);
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bool has_barycentric = false;
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has_barycentric = true;
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// Calculate faceted tangents and bitangents
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if (has_tangents)
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{
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tangents.resize(positions.size());
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bitangents.resize(positions.size());
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for (std::size_t i = 0; i < positions.size(); ++i)
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{
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tangents[i] = {0.0f, 0.0f, 0.0f};
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bitangents[i] = {0.0f, 0.0f, 0.0f};
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}
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for (std::size_t i = 0; i < faces.size(); ++i)
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{
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const std::vector<std::size_t>& face = faces[i];
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std::size_t ia = face[0];
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std::size_t ib = face[3];
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std::size_t ic = face[6];
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const float3& a = positions[ia];
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const float3& b = positions[ib];
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const float3& c = positions[ic];
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const float2& uva = uvs[face[1]];
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const float2& uvb = uvs[face[4]];
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const float2& uvc = uvs[face[7]];
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float3 ba = b - a;
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float3 ca = c - a;
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float2 uvba = uvb - uva;
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float2 uvca = uvc - uva;
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float f = 1.0f / (uvba.x * uvca.y - uvca.x * uvba.y);
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float3 tangent = (ba * uvca.y - ca * uvba.y) * f;
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float3 bitangent = (ba * -uvca.x + ca * uvba.x) * f;
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tangents[ia] += tangent;
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tangents[ib] += tangent;
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tangents[ic] += tangent;
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bitangents[ia] += bitangent;
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bitangents[ib] += bitangent;
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bitangents[ic] += bitangent;
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}
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}
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std::size_t vertex_size = 3;
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if (has_uvs)
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vertex_size += 2;
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if (has_normals)
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vertex_size += 3;
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if (has_tangents)
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vertex_size += 4;
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if (has_barycentric)
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vertex_size += 3;
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std::size_t vertex_stride = sizeof(float) * vertex_size;
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// Generate vertex buffer
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float* vertex_data = new float[vertex_size * faces.size() * 3];
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float* v = &vertex_data[0];
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for (std::size_t i = 0; i < faces.size(); ++i)
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{
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const std::vector<std::size_t>& face = faces[i];
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std::size_t k = 0;
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for (std::size_t j = 0; j < 3; ++j)
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{
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const float3& position = positions[face[k++]];
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*(v++) = position.x;
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*(v++) = position.y;
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*(v++) = position.z;
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if (has_uvs)
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{
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const float2& uv = uvs[face[k++]];
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*(v++) = uv.x;
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*(v++) = uv.y;
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}
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if (has_normals)
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{
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const float3& normal = normals[face[k++]];
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*(v++) = normal.x;
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*(v++) = normal.y;
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*(v++) = normal.z;
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}
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if (has_tangents)
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{
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const float3& n = normals[face[k - 1]];
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const float3& t = tangents[face[k - 3]];
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const float3& b = bitangents[face[k - 3]];
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// Gram-Schmidt orthogonalize tangent and bitangent
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float3 tangent = math::normalize(t - n * dot(n, t));
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float bitangent_sign = (math::dot(math::cross(n, t), b) < 0.0f) ? -1.0f : 1.0f;
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*(v++) = tangent.x;
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*(v++) = tangent.y;
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*(v++) = tangent.z;
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*(v++) = bitangent_sign;
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}
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if (has_barycentric)
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{
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*(v++) = barycentric_coords[j].x;
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*(v++) = barycentric_coords[j].y;
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*(v++) = barycentric_coords[j].z;
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}
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}
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}
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// Allocate a model
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model* model = new ::model();
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model->set_bounds(bounds);
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vertex_buffer* vbo = model->get_vertex_buffer();
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vertex_array* vao = model->get_vertex_array();
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vbo->resize(sizeof(float) * vertex_size * faces.size() * 3, vertex_data);
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std::size_t offset = 0;
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vao->bind_attribute(VERTEX_POSITION_LOCATION, *vbo, 3, vertex_attribute_type::float_32, vertex_stride, 0);
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offset += 3;
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if (has_uvs)
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{
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vao->bind_attribute(VERTEX_TEXCOORD_LOCATION, *vbo, 2, vertex_attribute_type::float_32, vertex_stride, sizeof(float) * offset);
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offset += 2;
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}
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if (has_normals)
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{
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vao->bind_attribute(VERTEX_NORMAL_LOCATION, *vbo, 3, vertex_attribute_type::float_32, vertex_stride, sizeof(float) * offset);
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offset += 3;
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}
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if (has_tangents)
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{
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vao->bind_attribute(VERTEX_TANGENT_LOCATION, *vbo, 4, vertex_attribute_type::float_32, vertex_stride, sizeof(float) * offset);
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offset += 4;
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}
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if (has_barycentric)
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{
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vao->bind_attribute(VERTEX_BARYCENTRIC_LOCATION, *vbo, 3, vertex_attribute_type::float_32, vertex_stride, sizeof(float) * offset);
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offset += 3;
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}
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// Add model groups for each material
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for (const material_group& material_group: material_groups)
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{
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model_group* model_group = model->add_group(material_group.name);
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model_group->set_material(material_group.material);
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model_group->set_drawing_mode(drawing_mode::triangles);
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model_group->set_start_index(material_group.start_index);
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model_group->set_index_count(material_group.index_count);
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}
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// Deallocate vertex data
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delete[] vertex_data;
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return model;
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}
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*/
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template <>
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model* resource_loader<model>::load(resource_manager* resource_manager, PHYSFS_File* file)
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{
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// Read file into buffer
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std::size_t size = static_cast<int>(PHYSFS_fileLength(file));
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std::vector<std::uint8_t> buffer(size);
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PHYSFS_readBytes(file, &buffer.front(), size);
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// Parse CBOR in file buffer
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nlohmann::json json = nlohmann::json::from_cbor(buffer);
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// Find model name
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std::string model_name;
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if (auto it = json.find("name"); it != json.end())
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model_name = it.value();
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// Load attributes
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std::unordered_map<std::string, std::tuple<std::size_t, std::vector<float>>> attributes;
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if (auto attributes_node = json.find("attributes"); attributes_node != json.end())
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{
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for (const auto& attribute_node: attributes_node.value().items())
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{
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// Look up attribute name
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std::string attribute_name;
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if (auto type_node = attribute_node.value().find("name"); type_node != attribute_node.value().end())
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attribute_name = type_node.value().get<std::string>();
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// Allocate attribute in attribute map
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auto& attribute = attributes[attribute_name];
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std::size_t& attribute_size = std::get<0>(attribute);
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std::vector<float>& attribute_data = std::get<1>(attribute);
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// Look up attribute size (per vertex)
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attribute_size = 0;
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if (auto size_node = attribute_node.value().find("size"); size_node != attribute_node.value().end())
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attribute_size = size_node.value().get<std::size_t>();
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// Look up attribute data
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if (auto data_node = attribute_node.value().find("data"); data_node != attribute_node.value().end())
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{
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// Resize attribute data
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attribute_data.resize(data_node.value().size());
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// Fill attribute data
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float* v = &attribute_data.front();
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for (const auto& element: data_node.value())
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*(v++) = element.get<float>();
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}
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}
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}
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// Load bounds
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geom::aabb<float> bounds =
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{
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{std::numeric_limits<float>::infinity(), std::numeric_limits<float>::infinity(), std::numeric_limits<float>::infinity()},
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{-std::numeric_limits<float>::infinity(), -std::numeric_limits<float>::infinity(), -std::numeric_limits<float>::infinity()}
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};
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if (auto bounds_node = json.find("bounds"); bounds_node != json.end())
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{
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if (auto min_node = bounds_node.value().find("min"); min_node != bounds_node.value().end())
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{
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float* v = &bounds.min_point.x;
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for (const auto& element: min_node.value())
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*(v++) = element.get<float>();
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}
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if (auto max_node = bounds_node.value().find("max"); max_node != bounds_node.value().end())
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{
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float* v = &bounds.max_point.x;
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for (const auto& element: max_node.value())
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*(v++) = element.get<float>();
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}
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}
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// Allocate a model
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model* model = new ::model();
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// Set the model bounds
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model->set_bounds(bounds);
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// Calculate vertex size, count, and stride
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std::size_t vertex_size = 0;
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std::size_t vertex_count = 0;
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for (auto it = attributes.begin(); it != attributes.end(); ++it)
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{
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vertex_size += std::get<0>(it->second);
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vertex_count = std::get<1>(it->second).size() / std::get<0>(it->second);
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}
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std::size_t vertex_stride = sizeof(float) * vertex_size;
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// Build interleaved vertex data buffer
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float* vertex_data = new float[vertex_size * vertex_count];
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float* v = &vertex_data[0];
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for (std::size_t i = 0; i < vertex_count; ++i)
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{
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for (auto it = attributes.begin(); it != attributes.end(); ++it)
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{
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std::size_t attribute_size = std::get<0>(it->second);
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const float* a = &(std::get<1>(it->second)[i * attribute_size]);
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for (std::size_t j = 0; j < attribute_size; ++j)
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*(v++) = *(a++);
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}
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}
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// Resize VBO and upload vertex data
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gl::vertex_buffer* vbo = model->get_vertex_buffer();
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vbo->resize(sizeof(float) * vertex_size * vertex_count, vertex_data);
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// Free interleaved vertex data buffer
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delete[] vertex_data;
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// Map attribute names to locations
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static const std::unordered_map<std::string, unsigned int> attribute_location_map =
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{
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{"position", VERTEX_POSITION_LOCATION},
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{"texcoord", VERTEX_TEXCOORD_LOCATION},
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{"normal", VERTEX_NORMAL_LOCATION},
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{"tangent", VERTEX_TANGENT_LOCATION},
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{"color", VERTEX_COLOR_LOCATION},
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{"bone_index", VERTEX_BONE_INDEX_LOCATION},
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{"bone_weight", VERTEX_BONE_WEIGHT_LOCATION},
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{"barycentric", VERTEX_BARYCENTRIC_LOCATION}
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};
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// Bind attributes to VAO
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gl::vertex_array* vao = model->get_vertex_array();
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std::size_t offset = 0;
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for (auto attribute_it = attributes.begin(); attribute_it != attributes.end(); ++attribute_it)
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{
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std::string attribute_name = attribute_it->first;
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std::size_t attribute_size = std::get<0>(attribute_it->second);
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if (auto location_it = attribute_location_map.find(attribute_name); location_it != attribute_location_map.end())
|
|
vao->bind_attribute(location_it->second, *vbo, attribute_size, gl::vertex_attribute_type::float_32, vertex_stride, offset);
|
|
|
|
offset += attribute_size * sizeof(float);
|
|
}
|
|
|
|
// Load materials
|
|
if (auto materials_node = json.find("materials"); materials_node != json.end())
|
|
{
|
|
for (const auto& material_node: materials_node.value().items())
|
|
{
|
|
std::string group_name;
|
|
std::size_t group_offset = 0;
|
|
std::size_t group_size = 0;
|
|
material* group_material = nullptr;
|
|
|
|
if (auto name_node = material_node.value().find("name"); name_node != material_node.value().end())
|
|
group_name = name_node.value().get<std::string>();
|
|
if (auto offset_node = material_node.value().find("offset"); offset_node != material_node.value().end())
|
|
group_offset = offset_node.value().get<std::size_t>();
|
|
if (auto size_node = material_node.value().find("size"); size_node != material_node.value().end())
|
|
group_size = size_node.value().get<std::size_t>();
|
|
|
|
// Slugify material filename
|
|
std::string material_filename = group_name + ".mtl";
|
|
std::replace(material_filename.begin(), material_filename.end(), '_', '-');
|
|
|
|
// Load material from file
|
|
group_material = resource_manager->load<material>(material_filename);
|
|
|
|
model_group* model_group = model->add_group(group_name);
|
|
model_group->set_drawing_mode(gl::drawing_mode::triangles);
|
|
model_group->set_start_index(group_offset * 3);
|
|
model_group->set_index_count(group_size * 3);
|
|
model_group->set_material(group_material);
|
|
}
|
|
}
|
|
|
|
return model;
|
|
}
|