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gh-36: rework query system for scene ecs updates
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| /**********************************************************************************/ | ||
| /* Wmoge game engine */ | ||
| /* Available at github https://github.com/EgorOrachyov/wmoge */ | ||
| /**********************************************************************************/ | ||
| /* MIT License */ | ||
| /* */ | ||
| /* Copyright (c) 2023 Egor Orachyov */ | ||
| /* */ | ||
| /* Permission is hereby granted, free of charge, to any person obtaining a copy */ | ||
| /* of this software and associated documentation files (the "Software"), to deal */ | ||
| /* in the Software without restriction, including without limitation the rights */ | ||
| /* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell */ | ||
| /* copies of the Software, and to permit persons to whom the Software is */ | ||
| /* furnished to do so, subject to the following conditions: */ | ||
| /* */ | ||
| /* The above copyright notice and this permission notice shall be included in all */ | ||
| /* copies or substantial portions of the Software. */ | ||
| /* */ | ||
| /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR */ | ||
| /* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, */ | ||
| /* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE */ | ||
| /* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER */ | ||
| /* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, */ | ||
| /* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE */ | ||
| /* SOFTWARE. */ | ||
| /**********************************************************************************/ | ||
|
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| #pragma once | ||
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| #include "core/array_view.hpp" | ||
| #include "core/string_id.hpp" | ||
| #include "ecs/ecs_core.hpp" | ||
| #include "ecs/ecs_entity.hpp" | ||
| #include "ecs/ecs_memory.hpp" | ||
|
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| namespace wmoge { | ||
|
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| /** @brief Component access and modification type in query */ | ||
| enum class EcsComponentAccess { | ||
| ReadOnly = 0, | ||
| ReadWrite | ||
| }; | ||
|
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| /** @brief Describes presence of components in query */ | ||
| enum class EcsComponentPresence { | ||
| Required = 0, | ||
| Optional, | ||
| Exclude | ||
| }; | ||
|
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| /** | ||
| * @class EcsQuery | ||
| * @brief Configures query to iterate over specific type of entities | ||
| */ | ||
| struct EcsQuery { | ||
| using Bitset = std::bitset<EcsLimits::MAX_COMPONENTS>; | ||
|
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| Bitset read_only; | ||
| Bitset read_write; | ||
| Bitset required; | ||
| Bitset optional; | ||
| Bitset exclude; | ||
| Strid name; | ||
|
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| EcsQuery() = default; | ||
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| template<typename Component> | ||
| EcsQuery& add(EcsComponentPresence presence = EcsComponentPresence::Required, EcsComponentAccess access = EcsComponentAccess::ReadOnly) { | ||
| if (presence == EcsComponentPresence::Exclude) { | ||
| exclude.set(Component::IDX); | ||
| return; | ||
| } | ||
| if (presence == EcsComponentPresence::Required) { | ||
| required.set(Component::IDX); | ||
| } | ||
| if (presence == EcsComponentPresence::Optional) { | ||
| optional.set(Component::IDX); | ||
| } | ||
| if (access == EcsComponentAccess::ReadOnly) { | ||
| read_only.set(Component::IDX); | ||
| } | ||
| if (access == EcsComponentAccess::ReadWrite) { | ||
| read_write.set(Component::IDX); | ||
| } | ||
| return *this; | ||
| } | ||
|
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| bool match(const EcsArch& arch) const { | ||
| if ((required & arch) != required) { | ||
| return false; | ||
| } | ||
| if ((exclude & arch).any()) { | ||
| return false; | ||
| } | ||
| return true; | ||
| } | ||
|
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| [[nodiscard]] std::string to_string() const { return ""; } | ||
| }; | ||
|
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| inline std::ostream& operator<<(std::ostream& stream, const EcsQuery& query) { | ||
| stream << query.to_string(); | ||
| return stream; | ||
| } | ||
|
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| /** | ||
| * @class EcsQueryContext | ||
| * @brief Context passed to execute function when query is executed | ||
| */ | ||
| class EcsQueryContext { | ||
| public: | ||
| EcsQueryContext(EcsArchStorage& storage, EcsQuery query, int start, int count) | ||
| : m_storage(storage), | ||
| m_arch(storage.get_arch()), | ||
| m_query(query), | ||
| m_range_start(start), | ||
| m_range_count(count) { | ||
| } | ||
|
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| template<typename Component> | ||
| bool has() { return m_arch.has_component<Component>(); } | ||
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| template<typename Component> | ||
| Component& get_component(int entity_idx) { return *m_storage.get_component<Component>(entity_idx); } | ||
| EcsEntity get_entity(int entity_idx) { return m_storage.get_entity(entity_idx); } | ||
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| [[nodiscard]] int get_start_idx() const { return m_range_start; } | ||
| [[nodiscard]] int get_count() const { return m_range_count; } | ||
|
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| private: | ||
| EcsArchStorage& m_storage; | ||
| EcsQuery m_query; | ||
| EcsArch m_arch; | ||
| int m_range_start = -1; | ||
| int m_range_count = 0; | ||
| }; | ||
|
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| /** @brief Function used to execute ecs query */ | ||
| using EcsQueuryFunction = std::function<void(EcsQueryContext& context)>; | ||
|
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| }// namespace wmoge |
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