💿🐜 Antkeeper source code
https://antkeeper.com
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156 lines
4.6 KiB
156 lines
4.6 KiB
/*
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* Copyright (C) 2023 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 "game/systems/render-system.hpp"
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#include "game/components/transform-component.hpp"
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#include "game/components/rigid-body-component.hpp"
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#include <algorithm>
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#include <execution>
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render_system::render_system(entity::registry& registry):
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updatable_system(registry),
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updated_scene_transforms(registry, entt::collector.update<transform_component>().where<scene_component>(entt::exclude<rigid_body_component>)),
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t(0.0),
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dt(0.0),
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renderer(nullptr)
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{
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registry.on_construct<scene_component>().connect<&render_system::on_scene_construct>(this);
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registry.on_update<scene_component>().connect<&render_system::on_scene_update>(this);
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registry.on_destroy<scene_component>().connect<&render_system::on_scene_destroy>(this);
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registry.on_construct<transform_component>().connect<&render_system::on_transform_construct>(this);
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}
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render_system::~render_system()
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{
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registry.on_construct<scene_component>().disconnect<&render_system::on_scene_construct>(this);
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registry.on_update<scene_component>().disconnect<&render_system::on_scene_update>(this);
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registry.on_destroy<scene_component>().disconnect<&render_system::on_scene_destroy>(this);
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registry.on_construct<transform_component>().disconnect<&render_system::on_transform_construct>(this);
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}
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void render_system::update(float t, float dt)
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{
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this->t = t;
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this->dt = dt;
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std::for_each
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(
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std::execution::par_unseq,
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updated_scene_transforms.begin(),
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updated_scene_transforms.end(),
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[&](auto entity_id)
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{
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auto& transform = registry.get<transform_component>(entity_id);
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const auto& scene = registry.get<scene_component>(entity_id);
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// WARNING: could potentially lead to multithreading issues with scene::object_base::transformed()
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scene.object->set_transform(transform.world);
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}
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);
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updated_scene_transforms.clear();
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}
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void render_system::draw(float alpha)
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{
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if (renderer)
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{
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for (scene::collection* collection: layers)
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{
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renderer->render(t + dt * alpha, dt, alpha, *collection);
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}
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}
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}
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void render_system::add_layer(scene::collection* layer)
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{
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layers.push_back(layer);
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}
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void render_system::remove_layers()
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{
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layers.clear();
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}
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void render_system::set_renderer(render::renderer* renderer)
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{
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this->renderer = renderer;
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}
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void render_system::on_scene_construct(entity::registry& registry, entity::id entity_id)
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{
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const auto& component = registry.get<::scene_component>(entity_id);
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// Update scene object transform with pre-existing transform component
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if (const auto transform = registry.try_get<transform_component>(entity_id))
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{
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component.object->set_transform(transform->world);
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}
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for (std::size_t i = 0; i < layers.size(); ++i)
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{
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if (component.layer_mask & static_cast<std::uint8_t>(1 << i))
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{
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layers[i]->add_object(*component.object);
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}
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}
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}
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void render_system::on_scene_update(entity::registry& registry, entity::id entity_id)
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{
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const auto& component = registry.get<::scene_component>(entity_id);
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for (std::size_t i = 0; i < layers.size(); ++i)
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{
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// Remove from layer
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scene::collection* layer = layers[i];
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layer->remove_object(*component.object);
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if (component.layer_mask & static_cast<std::uint8_t>(1 << i))
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{
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// Add to layer
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layer->add_object(*component.object);
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}
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}
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}
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void render_system::on_scene_destroy(entity::registry& registry, entity::id entity_id)
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{
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const auto& component = registry.get<::scene_component>(entity_id);
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for (std::size_t i = 0; i < layers.size(); ++i)
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{
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if (component.layer_mask & static_cast<std::uint8_t>(1 << i))
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{
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layers[i]->remove_object(*component.object);
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}
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}
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}
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void render_system::on_transform_construct(entity::registry& registry, entity::id entity_id)
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{
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// Update pre-existing scene object transform withtransform component
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if (const auto scene = registry.try_get<scene_component>(entity_id))
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{
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const auto& transform = registry.get<transform_component>(entity_id);
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scene->object->set_transform(transform.world);
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}
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}
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