physics.hpp

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// physics.hpp
/*
  neogfx C++ App/Game Engine
  Copyright (c) 2018, 2020 Leigh Johnston.  All Rights Reserved.
  
  This program is free software: you can redistribute it and / or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
  
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
 
#pragma once
 
#include <neogfx/neogfx.hpp>
#include <neolib/core/uuid.hpp>
#include <neolib/core/string.hpp>
#include <neogfx/game/i_component_data.hpp>
 
namespace neogfx::game
{
    struct physics
    {
        scalar gravitationalConstant;
        std::optional<vec3> uniformGravity;
 
        struct meta : i_component_data::meta
        {
            static const neolib::uuid& id()
            {
                static const neolib::uuid sId = { 0x9798003a, 0x655c, 0x409a, 0xbded, { 0xc1, 0x7f, 0xf5, 0xd3, 0x4c, 0x79 } };
                return sId;
            }
            static const i_string& name()
            {
                static const string sName = "Physics";
                return sName;
            }
            static uint32_t field_count()
            { 
                return 2; 
            }
            static component_data_field_type field_type(uint32_t aFieldIndex)
            {
                switch (aFieldIndex)
                {
                case 0:
                    return component_data_field_type::Scalar;
                case 1:
                    return component_data_field_type::Vec3 | component_data_field_type::Optional;
                default:
                    throw invalid_field_index();
                }
            }
            static const i_string& field_name(uint32_t aFieldIndex)
            {
                static const string sFieldNames[] = 
                {
                    "Gravitational Constant",
                    "Uniform Gravity"
                };
                return sFieldNames[aFieldIndex];
            }
        };
    };
}