Mergul
4b19907c03
-more messy tests -some documentation -some useful code moved to functions -adding components to existing entity -opportunity to get entity by ID -fixed calculating deltas -sorting IDs arrays for allocating Templates -fixed alignment caluclation -added compile-time checks for "component_id" member existing in component
570 lines
17 KiB
D
570 lines
17 KiB
D
module ecs.manager;
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import std.experimental.allocator.mallocator : Mallocator, AlignedMallocator;
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import std.experimental.allocator;
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import std.traits;
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import std.algorithm : max;
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import std.conv : to;
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import core.stdc.string;
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import core.stdc.stdlib;
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import ecs.system;
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import ecs.entity;
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import ecs.vector;
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import ecs.hash_map;
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import ecs.id_manager;
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alias gEM = EntityManager.instance;
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class EntityManager
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{
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static void initialize()
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{
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instance = Mallocator.instance.make!EntityManager;
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}
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static void destory()
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{
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Mallocator.instance.dispose(instance);
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instance = null;
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}
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void registerSystem(Sys)(int priority)
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{
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alias types = Parameters!(Sys.update);
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System system;
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static string genCall()()
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{
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string ret = "s.update(*cast(Entity*)data_pointer,";
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foreach (i; 1 .. (Parameters!(Sys.update)).length)
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{
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ret ~= "*cast(types[" ~ i.to!string ~ "]*)(data_pointer + data.deltas[" ~ (i - 1)
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.to!string ~ "]),";
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}
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ret ~= ");";
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return ret;
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}
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static string genCompList()()
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{
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string ret;
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foreach (i; 1 .. (Parameters!(Sys.update)).length)
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{
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ret ~= "system.m_components[" ~ (i - 1)
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.to!string ~ "] = components_map.get(types[" ~ i.to!string ~ "].stringof);\n";
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}
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return ret;
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}
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static if (hasMember!(Sys, "update"))
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{
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static void callUpdate(ref CallData data, void* entity)
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{
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static if (hasMember!(Sys, "update"))
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{
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Sys* s = cast(Sys*) data.system.m_system_pointer;
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EntitiesBlock* block = data.info.first_block;
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while (block !is null)
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{
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void* data_pointer = block.dataBegin();
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foreach (i; 0 .. block.entities_count)
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{
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mixin(genCall());
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data_pointer += data.info.size;
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}
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block = block.next_block;
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}
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}
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}
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system.m_update = &callUpdate;
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}
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static if (hasMember!(Sys, "onEnable"))
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{
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static void callEnable(void* system_pointer)
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{
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Sys* s = cast(Sys*) system_pointer;
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s.onEnable();
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}
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system.m_enable = &callEnable;
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}
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static if (hasMember!(Sys, "onDisable"))
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{
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static void callDisable(void* system_pointer)
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{
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Sys* s = cast(Sys*) system_pointer;
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s.onDisable();
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}
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system.m_disable = &callDisable;
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}
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system.m_system_pointer = cast(void*) Mallocator.instance.make!Sys;
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system.m_components = Mallocator.instance.makeArray!uint(types.length - 1);
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mixin(genCompList());
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systems.add(system);
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systems[$ - 1].enable();
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foreach (info; &entities_infos.byValue)
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{
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addEntityCaller(*info, systems[$ - 1]);
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}
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}
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void registerComponent(Comp)()
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{
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static if (!(hasMember!(Comp, "component_id")) || !is(typeof(Comp.component_id) == ushort))
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{
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static assert(0, "Component should have \"__gshared ushort component_id");
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}
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ushort size = Comp.sizeof;
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ComponentInfo info;
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info.size = size;
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info.aligment = Comp.alignof; //8;
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components.add(info);
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Comp.component_id = cast(ushort)(components.length - 1);
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components_map.add(Comp.stringof, cast(uint)(components.length - 1));
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}
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void update()
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{
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foreach (info; &entities_infos.byValue)
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{
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foreach (data; info.callers)
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{
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if (data.system.enabled)
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(cast(SytemFuncType) data.system.m_update)(data, null); //caller(call_data,null);
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}
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}
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}
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static void alignNum(ref ushort num, ushort aligment)
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{
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num = cast(ushort)((num + aligment - 1) & (-cast(int) aligment)); //num += aligment - (num & (aligment - 1));
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}
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EntityTemplate* allocateTemplate(ushort[] components_ids)
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{
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extern (C) static int compareUShorts(const void* a, const void* b)
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{
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ushort _a = *cast(ushort*) a;
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ushort _b = *cast(ushort*) b;
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if (_a < _b)
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return -1;
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else if (_a == _b)
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return 0;
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else
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return 1;
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}
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ushort[] ids = (cast(ushort*) alloca(ushort.sizeof * components_ids.length))[0
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.. components_ids.length];
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ids[0 .. $] = components_ids[];
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qsort(ids.ptr, ids.length, ushort.sizeof, &compareUShorts);
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{
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uint j = 1;
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foreach (i; 1 .. ids.length)
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{
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if (ids[i] != ids[j - 1])
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{
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ids[j] = ids[i];
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j++;
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}
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else
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debug assert(0, "Duplicated components in template!!!");
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}
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ids = ids[0 .. j];
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}
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EntityInfo* info = getEntityInfo(ids);
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EntityTemplate* temp = Mallocator.instance.make!EntityTemplate;
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temp.entity_data = Mallocator.instance.makeArray!ubyte(info.size);
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temp.info = info;
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return temp;
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}
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EntityInfo* getEntityInfo(ushort[] ids)
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{
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EntityInfo* info = entities_infos.get(ids, null);
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if (info is null)
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{
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info = Mallocator.instance.make!EntityInfo;
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info.components = Mallocator.instance.makeArray(ids);
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info.deltas = Mallocator.instance.makeArray!ushort(ids[$ - 1] + 1);
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info.size = EntityID.sizeof;
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info.alignment = EntityID.alignof;
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foreach (i, id; ids)
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{
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info.alignment = max(info.alignment, components[id].aligment);
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alignNum(info.size, components[id].aligment);
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info.deltas[id] = info.size;
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info.size += components[id].size;
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}
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alignNum(info.size, info.alignment);
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foreach (ref system; systems)
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{
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if (system.m_update is null)
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continue;
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addEntityCaller(*info, system);
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}
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entities_infos.add(info.components, info);
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}
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return info;
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}
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void addEntityCaller(ref EntityInfo entity, ref System system)
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{
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CallData call_data = CallData(&system, &entity, null);
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ushort[] deltas = (cast(ushort*) alloca(system.m_components.length * ushort.sizeof))[0
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.. system.m_components.length];
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foreach (i, id; system.m_components)
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{
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deltas[i] = ushort.max;
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foreach (i2, id2; entity.components)
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{
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if (id2 == id)
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{
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deltas[i] = entity.deltas[id2];
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break;
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}
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}
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if (deltas[i] == ushort.max)
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{
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deltas = null;
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break;
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}
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}
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if (deltas)
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{
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call_data.deltas = Mallocator.instance.makeArray(deltas); //Mallocator.instance.makeArray!ushort(system.m_components.length);
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entity.callers.add(call_data);
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}
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}
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Entity* getEntity(EntityID id)
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{
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return cast(Entity*) id_manager.getEntityPointer(id);
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}
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void addComponents(Components...)(EntityID entity_id, Components comps)
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{
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const uint num = Components.length;
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Entity* entity = id_manager.getEntityPointer(entity_id);
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EntitiesBlock* block = getMetaData(entity);
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EntityInfo* info = block.type_data;
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ushort[] ids = (cast(ushort*) alloca(ushort.sizeof * (info.components.length + num)))[0
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.. info.components.length + num];
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ushort[num] new_ids;
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static foreach (i, comp; Components)
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{
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new_ids[i] = comp.component_id;
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}
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void*[num] pointers;
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static foreach (i, comp; comps)
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{
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pointers[i] = ∁
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}
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uint j = 0;
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uint k = 0;
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foreach (ref id; ids)
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{
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if (k >= new_ids.length)
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{
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id = info.components[j++];
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continue;
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}
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if (j >= info.components.length)
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{
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id = new_ids[k++];
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continue;
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}
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debug if (new_ids[k] == info.components[j])
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assert(0, "Trying to add already existing component!");
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if (new_ids[k] < info.components[j])
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{
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id = new_ids[k++];
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}
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else
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id = info.components[j++];
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}
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EntityInfo* new_info = getEntityInfo(ids);
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EntitiesBlock* new_block = findBlockWithFreeSpace(new_info);
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void* start = new_block.dataBegin() + new_block.entities_count * new_info.size;
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Entity* new_entity = cast(Entity*) start;
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new_entity.id = entity.id;
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new_entity.updateID();
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new_block.entities_count++;
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//removeEntityNoID(entity, block);
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j = 0;
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k = 0;
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foreach (ref id; ids)
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{
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if (k >= new_ids.length)
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{
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memcpy(cast(void*) new_entity + new_info.deltas[id],
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cast(void*) entity + info.deltas[info.components[j]],
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components[info.components[j]].size); //id = info.components[j++];
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j++;
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}
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else if (j >= info.components.length)
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{
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memcpy(cast(void*) new_entity + new_info.deltas[id],
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pointers[k], components[new_ids[k]].size); //id = new_ids[k++];
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k++;
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}
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else if (id == new_ids[k])
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{
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memcpy(cast(void*) new_entity + new_info.deltas[id],
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pointers[k], components[new_ids[k]].size); //id = new_ids[k++];
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k++;
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}
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else
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{
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memcpy(cast(void*) new_entity + new_info.deltas[id],
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cast(void*) entity + info.deltas[info.components[j]],
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components[info.components[j]].size); //id = info.components[j++];
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j++;
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}
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}
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removeEntityNoID(entity, block);
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}
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void freeTemplate(EntityTemplate* template_)
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{
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Mallocator.instance.dispose(template_.entity_data);
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Mallocator.instance.dispose(template_);
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}
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ref Entity addEntity(EntityTemplate* tmpl)
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{
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EntitiesBlock* block = findBlockWithFreeSpace(tmpl.info);
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void* start = block.dataBegin() + block.entities_count * tmpl.info.size;
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memcpy(start, tmpl.entity_data.ptr, tmpl.info.size);
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Entity* entity = cast(Entity*) start;
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entity.id = id_manager.getNewID();
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entity.updateID();
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block.entities_count++;
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return *entity;
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}
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EntitiesBlock* findBlockWithFreeSpace(EntityInfo* info)
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{
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EntitiesBlock* previous_block;
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EntitiesBlock* block = info.first_with_free_space;
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while (1)
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{
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if (block is null)
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{
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block = cast(EntitiesBlock*) AlignedMallocator.instance.alignedAllocate(page_size,
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page_size);
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*block = EntitiesBlock(info);
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if (previous_block is null)
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{
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info.first_block = block;
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block.id = 0;
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}
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else
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{
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previous_block.next_block = block;
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block.id = previous_block.id + 1;
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}
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info.first_with_free_space = block;
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break; // new block certainly has free space
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}
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// check if there is enought space
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if (block.dataDelta() + (block.entities_count + 1) * info.size > page_size)
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{
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previous_block = block;
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block = block.next_block;
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continue;
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}
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info.first_with_free_space = block;
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break; // block exists and bounds check passed
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}
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return block;
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}
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void removeEntity(EntityID id)
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{
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//get entity and block meta data pointers
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Entity* entity = id_manager.getEntityPointer(id);
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if (entity is null)
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return; //return if entity doesn't exist
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EntitiesBlock* block = getMetaData(entity);
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id_manager.releaseID(id); //release id from manager
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removeEntityNoID(entity, block);
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}
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private void removeEntityNoID(Entity* entity, EntitiesBlock* block)
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{
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//pos is Entity number in block
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void* data_begin = block.dataBegin();
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uint pos = cast(int)(cast(void*) entity - data_begin) / block.type_data.size;
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block.entities_count--;
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//set "first_with_free_space" if should it be
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if (block.type_data.first_with_free_space.id > block.id)
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block.type_data.first_with_free_space = block;
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if (pos == block.entities_count)
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return;
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//copy memory of last entity to position of removed entity
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void* src = data_begin + block.entities_count * block.type_data.size;
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void* dst = data_begin + pos * block.type_data.size;
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memcpy(dst, src, block.type_data.size);
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//update pointer for moved entity ID
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entity = cast(Entity*) dst;
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entity.updateID();
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}
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/************************************************************************************************************************
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*functions return MetaData of page.
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*
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*params:
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*pointer = pointer to any data of entity (i.e. component data pointer)
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*/
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EntitiesBlock* getMetaData(void* pointer)
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{
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return cast(EntitiesBlock*)(cast(size_t) pointer & (~cast(size_t)(page_size - 1)));
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}
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struct ComponentInfo
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{
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ushort size;
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ushort aligment;
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}
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/************************************************************************************************************************
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*Entity type info.
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*/
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struct EntityInfo
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{
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///entity components
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ushort[] components;
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///deltas in memory for components
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ushort[] deltas;
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///aligment of whole entity
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ushort alignment;
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///size of entity (with alignment respect)
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ushort size;
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///pointer to first block/page
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EntitiesBlock* first_block;
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///a hint for allocations
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EntitiesBlock* first_with_free_space; // a hint for allocations, should have empty space in it but doesn't have to
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///array of CallData. Contain data for System calls.
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Vector!(CallData) callers;
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}
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/************************************************************************************************************************
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*Meta data of every block of entities (contained at the begining of block).
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*/
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struct EntitiesBlock
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{
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///return distance (in bytes) from begin of block to data
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uint dataDelta()
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{
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ushort dif = EntitiesBlock.sizeof;
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alignNum(dif, type_data.alignment);
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return dif;
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}
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///return pointer to first element in block
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void* dataBegin()
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{
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ushort dif = EntitiesBlock.sizeof;
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alignNum(dif, type_data.alignment);
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return cast(void*)&this + dif;
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}
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///pointer to Entity type info
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EntityInfo* type_data;
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///number of entities in block
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uint entities_count;
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///block id
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uint id;
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///pointer to next block/page
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EntitiesBlock* next_block;
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//there is a loooot of data (4kB, pure magic)
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}
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/************************************************************************************************************************
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*Structure with data used to calling System calls.
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*/
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struct CallData
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{
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///pointer to used system
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System* system;
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///poiner to Entity type info
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EntityManager.EntityInfo* info;
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///deltas for components
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ushort[] deltas;
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}
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alias SytemFuncType = void function(ref EntityManager.CallData data, void* entity);
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///Single page size. Must be power of two.
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enum page_size = 4096;
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///Number of pages in block.
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enum pages_in_block = 128;
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IDManager id_manager;
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HashMap!(ushort[], EntityInfo*) entities_infos;
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HashMap!(string, uint) components_map;
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Vector!System systems;
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Vector!ComponentInfo components;
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__gshared EntityManager instance;
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}
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/*
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static ulong defaultHashFunc(T)(auto ref T t)
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{
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ulong ret = 0;
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foreach(id;t)
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{
|
|
ret = ret
|
|
}
|
|
}*/
|