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- /*
- * Copyright (C) 2021 Christopher J. Howard
- *
- * This file is part of Antkeeper source code.
- *
- * Antkeeper source code 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.
- *
- * Antkeeper source code 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 Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
- */
-
- #include "constraint-system.hpp"
- #include "ecs/components/copy-translation-component.hpp"
- #include "ecs/components/copy-rotation-component.hpp"
- #include "ecs/components/copy-scale-component.hpp"
- #include "ecs/components/copy-transform-component.hpp"
- #include "ecs/components/transform-component.hpp"
- #include "utility/fundamental-types.hpp"
-
- namespace ecs {
-
- constraint_system::constraint_system(ecs::registry& registry):
- entity_system(registry)
- {}
-
- void constraint_system::update(double t, double dt)
- {
- auto transforms_view = registry.view<transform_component>();
-
- // Handle copy translation constraints
- registry.view<copy_translation_component, transform_component>().each
- (
- [&](ecs::entity entity, auto& constraint, auto& transform)
- {
- if (this->registry.has<transform_component>(constraint.target))
- {
- const float3& target_translation = transforms_view.get(constraint.target).world.translation;
- if (constraint.use_x)
- transform.world.translation.x = (constraint.invert_x) ? -target_translation.x : target_translation.x;
- if (constraint.use_y)
- transform.world.translation.y = (constraint.invert_y) ? -target_translation.y : target_translation.y;
- if (constraint.use_z)
- transform.world.translation.z = (constraint.invert_z) ? -target_translation.z : target_translation.z;
- }
- }
- );
-
- // Handle copy rotation constraints
- registry.view<copy_rotation_component, transform_component>().each
- (
- [&](ecs::entity entity, auto& constraint, auto& transform)
- {
- if (this->registry.has<transform_component>(constraint.target))
- {
- transform.world.rotation = transforms_view.get(constraint.target).world.rotation;
- }
- }
- );
-
- // Handle copy scale constraints
- registry.view<copy_scale_component, transform_component>().each
- (
- [&](ecs::entity entity, auto& constraint, auto& transform)
- {
- if (this->registry.has<transform_component>(constraint.target))
- {
- const float3& target_scale = transforms_view.get(constraint.target).world.scale;
- if (constraint.use_x)
- transform.world.scale.x = target_scale.x;
- if (constraint.use_y)
- transform.world.scale.y = target_scale.y;
- if (constraint.use_z)
- transform.world.scale.z = target_scale.z;
- }
- }
- );
-
- // Handle copy transform constraints
- registry.view<copy_transform_component, transform_component>().each
- (
- [&](ecs::entity entity, auto& constraint, auto& transform)
- {
- if (this->registry.has<transform_component>(constraint.target))
- {
- transform.world = transforms_view.get(constraint.target).world;
- }
- }
- );
- }
-
- } // namespace ecs
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