transform_resolution.h

#pragma once
 
#include "pixelbullet/scene/animation_evaluation.h"
#include "pixelbullet/scene/components/transform.h"
#include "pixelbullet/scene/entity_id.h"
 
#include <glm/glm.hpp>
 
#include <optional>
#include <unordered_map>
 
namespace pixelbullet
{
class Scene;
 
struct SceneResolvedTransforms
{
    std::unordered_map<EntityId::ValueType, EntityId> resolved_parents;
    std::unordered_map<EntityId::ValueType, Transform> local_transforms;
    std::unordered_map<EntityId::ValueType, Transform> world_transforms;
    std::unordered_map<EntityId::ValueType, glm::mat4> world_matrices;
 
    [[nodiscard]] const EntityId* FindResolvedParent(EntityId entity) const noexcept;
    [[nodiscard]] const Transform* FindLocalTransform(EntityId entity) const noexcept;
    [[nodiscard]] const Transform* FindWorldTransform(EntityId entity) const noexcept;
    [[nodiscard]] const glm::mat4* FindWorldMatrix(EntityId entity) const noexcept;
};
 
class SceneTransformResolver
{
public:
    [[nodiscard]] static SceneResolvedTransforms Resolve(const Scene& scene, const SceneTransformOverrides* transform_overrides = nullptr);
    [[nodiscard]] static std::optional<EntityId> ResolveStoredParent(const Scene& scene, EntityId entity) noexcept;
};
} // namespace pixelbullet