Design

source/ecs/ecs.d

@@ -0,0 +1,241 @@
+module ecs.ecs;
+
+import std.stdio;
+
+
+
+alias SytemFuncType = void function(ref SystemCallData data, void* componentsStart);
+
+struct HasComponentsStore {
+	ulong[4] bits; //256 components
+
+	bool has(HasComponentsStore components) {
+		return true;
+	}
+
+	bool notIn(HasComponentsStore components) {
+		return true;
+	}
+
+	int length() {
+		assert(0);
+	}
+}
+
+// Informacje o kompnencie
+struct ComponentInfo {
+	int size;
+	int aligment;
+	SerializeJSON funsSerJ;
+	SerializeBiN funcSerB;
+}
+
+struct System {
+	HasComponentsStore requiredComponents;
+	HasComponentsStore absenComponents;
+	HasComponentsStore maybeComponents;
+	bool enabled;
+	int priority;
+	SytemFuncType func;
+}
+// Informacje o systemie dla konkretnego entitiesa
+struct SystemCallData {
+	System* system;
+	int[] componentsDt;
+}
+
+// Informacje o entitiesie danego typu
+struct EntityTypeData {
+	HasComponentsStore components;
+	int[] deltas;
+	int totalSize;
+	int totalAligment = 8;
+	SystemCallData[] systems;
+}
+
+struct EntitiesBlock {
+	EntityTypeData* typeData;
+	Entity* freeEntitySlot;
+	EntitiesBlock* nextBlock;
+}
+
+struct EntityID {
+	ulong id = ulong.max;
+	static immutable notUsedValue = EntityID(ulong.max);
+}
+
+// Dane konkretnego Entitiesa
+struct Entity {
+	EntityID entityID = EntityID.notUsedValue;
+	union {
+		string name;
+		Entity* nextFreeSlot;
+	}
+
+	//string eventOnDestroy;
+	uint group;
+	EntityID entityID;
+	//ubyte[XX] thereIsComponentsMemory;
+}
+
+struct Template {
+	HasComponentsStore hasComp;
+	Entity* entity;
+}
+
+struct Manager {
+	EntityAllocator entityArrayAllcoator;
+
+	ComponentInfo[] components;
+	System[] systems;
+	HashMap!(HasComponentsStore, EntitiesBlock*) entitiesDatas;
+	HashMapTwoWays!(string, Entity*) nameMap;
+	HashMapTwoWays!(EntityID, Entity*) idMap;
+
+	EntitiesBlock* getEntitiesBlock(HasComponentsStore hasComponents) {
+		EntitiesBlock* block = entitiesDatas.get(hasComponents, null);
+		if (block is null) {
+			// If such component combination was never present, add it
+			block = addNewBlock(hasComponents, block);
+			return block;
+		}
+		// Iterate over list of components until free slot is found or lists ends
+		do {
+			if (block.freeEntitySlot !is null) {
+				return block;
+			}
+			if (block.nextBlock is null) {
+				block = addNewBlock(hasComponents);
+				return block;
+			}
+			block = block.nextBlock;
+		}
+		while (block.nextBlock !is null);
+
+	}
+
+	EntitiesBlock* addNewBlock(HasComponentsStore hasComponents, EntitiesBlock* firstBlock) {
+		// Get last block so order of blocks is preserved, and first blocks are filled first
+		EntitiesBlock* lastBlock = firstBlock;
+		if (lastBlock !is null) {
+			while (lastBlock.nextBlock !is null) {
+				lastBlock = lastBlock.nextBlock;
+			}
+		}
+		assert(lastBlock is null || lastBlock.nextBlock is null);
+
+		ubyte[] memory = new ubyte[](4096);
+		EntitiesBlock* block = cast(EntitiesBlock*) memory.ptr;
+		if (lastBlock is null) {
+			EntityTypeData* entityTypeData = newEntityTypeData(hasComponents);
+			block.typeData = entityTypeData;
+			block.nextBlock = null;
+			entitiesDatas.add(hasComponents, block);
+		} else {
+			lastBlock.nextBlock = block;
+			block.typeData = lastBlock.typeData;
+			block.nextBlock = null;
+		}
+	}
+
+	void alignNum(ref int num, int aligment) {
+		int reminder = num % aligment;
+		if (reminder != 0) {
+			num += aligment - reminder;
+		}
+	}
+
+	EntityTypeData* newEntityTypeData(HasComponentsStore hasComponents) {
+		EntityTypeData* typeData = new EntityTypeData();
+		typeData.components = hasComponents;
+		ComponentInfo[] components = getComponentsInfo(hasComponents);
+		typeData.deltas.length = hasComponents.length;
+
+		foreach (i, comp; components) {
+			typeData.deltas[i] = typeData.totalSize;
+			typeData.totalAligment.max(comp.aligment);
+			typeData.totalSize += comp.size;
+			alignNum(typeData.totalSize, comp.aligment);
+		}
+		alignNum(typeData.totalSize, typeData.totalAligment);
+
+		foreach (sys; systems) {
+			if (!typeData.hasComp.has(sys.requiredComponents)
+					|| !typeData.hasComp.notIn(sys.absenComponents)) {
+				continue;
+			}
+			entTypeData.systems ~= sys
+		}
+
+		return typeData;
+	}
+
+	void addEntity(Template* templ) {
+		EntitiesBlock* block = getEntitiesBlock(templ.hasComp);
+		Entity* newEntity = block.freeEntitySlot;
+		block.freeEntitySlot = newEntity.nextFreeSlot;
+		// from to size
+		memcpy(temp.entity, newEntity, block.typeData.totalSize);
+	}
+
+	void addSystem(Func)(int priority) {
+		HasComponentsStore requiredComponents;
+		HasComponentsStore absenComponents;
+		HasComponentsStore maybeComponents;
+
+		void systemCaller(ref SystemCallData data, void * componentsStart) {
+			Func(cast(FUnc.par1Type)(componentsStart + data.componentsDt[0]),
+					cast(FUnc.par1Type)(componentsStart + data.componentsDt[1])...);
+		}
+		System* system = new System(&systemCaller, entTypeData);
+		systems~=system;
+
+		foreach (ref entTypeData; entitiesDatas) {
+			if (!entTypeData.hasComp.has(requiredComponents)
+					|| !entTypeData.hasComp.notIn(absenComponents)) {
+				continue;
+			}
+			entTypeData.systems ~= system;
+		}
+	}
+}
+
+void someSystem(CompA a, CompB b, CompC* c) {
+}
+
+void main() {
+	writeln("Edit source/app.d to start your project.");
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+class System{
+
+	void start(){
+
+	}
+
+	void end(){
+
+	}
+
+	void update(ref ObjRend a){
+
+	}
+
+	void useEvent(EventData evvv, ref ObjRend a){
+
+	}
+}
+