💿🐜 Antkeeper source code
https://antkeeper.com
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293 lines
7.8 KiB
293 lines
7.8 KiB
/*
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* Copyright (C) 2020 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 "rasterizer/vertex-attribute-type.hpp"
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#include "rasterizer/drawing-mode.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 <vmq/vmq.hpp>
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using namespace vmq::types;
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struct material_group
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{
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std::string name;
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material* material;
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std::size_t start_index;
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std::size_t index_count;
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};
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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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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<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_barycentric = true;
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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_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[0];
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*(v++) = position[1];
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*(v++) = position[2];
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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[0];
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*(v++) = uv[1];
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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[0];
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*(v++) = normal[1];
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*(v++) = normal[2];
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}
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if (has_barycentric)
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{
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*(v++) = barycentric_coords[j][0];
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*(v++) = barycentric_coords[j][1];
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*(v++) = barycentric_coords[j][2];
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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_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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