From b9f90793c8c0468d5f35d7af976a6e3bcd206aad Mon Sep 17 00:00:00 2001
From: Jonathan Bradley <jcb@pikum.xyz>
Date: Fri, 1 Sep 2023 10:10:51 -0400
Subject: add first graphics binding component

---
 src/ecs.cpp | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

(limited to 'src/ecs.cpp')

diff --git a/src/ecs.cpp b/src/ecs.cpp
index aa85873..33fec2b 100644
--- a/src/ecs.cpp
+++ b/src/ecs.cpp
@@ -7,6 +7,9 @@ const uint64_t bucketItemCount = 256;
 struct EntityBucket{
 	Entity entities[bucketItemCount];
 };
+struct GrBindsBucket{
+	CompGrBinds compGrBinds[bucketItemCount];
+};
 
 uint64_t entityBucketIncrementer = 2;
 EntityHandle_T entityBucketCounter{0};
@@ -15,8 +18,17 @@ EntityBucket *entityBuckets = nullptr;
 DynArray<EntityHandle> entitiesMarkedForRemoval{16};
 DynArray<EntityHandle> EntitiesToBeRemoved{16};
 
+BucketContainer<GrBindsBucket, GrBindsHandle_T> Comp_GrBinds_BucketContainer{};
+
+void ECS_GetEntity_Inner(EntityHandle entHandle, Entity*& ent) {
+	EntityHandle_T entHandle_t{static_cast<EntityHandle_T>(entHandle)};
+	assert(entHandle_t == ECS_UNSET_VAL && "Unknown entity handle");
+	ent = &entityBuckets[Buckets_GetBucketIndex(entHandle_t)].entities[Buckets_GetItemIndex(entHandle_t)];
+}
+
 void ECS_Init() {
 	entityBuckets = Pke_New<EntityBucket>(entityBucketIncrementer);
+	Buckets_Init(Comp_GrBinds_BucketContainer);
 }
 
 EntityHandle ECS_CreateEntity_Inner(EntityHandle parentEntityHandle) {
@@ -69,3 +81,32 @@ void ECS_Tick(double delta) {
 	}	
 	entitiesMarkedForRemoval.Resize(0);
 }
+
+CompGrBinds &ECS_CreateGrBinds(EntityHandle handle) {
+	Entity *ent = nullptr;
+	ECS_GetEntity_Inner(handle, ent);
+	GrBindsHandle_T newHandle{Buckets_NewHandle(bucketItemCount, Comp_GrBinds_BucketContainer)};
+	ent->grBindsHandle = GrBindsHandle{newHandle};
+	return Comp_GrBinds_BucketContainer.buckets[Buckets_GetBucketIndex(newHandle)].compGrBinds[Buckets_GetItemIndex(newHandle)];
+}
+
+CompGrBinds *ECS_GetGrBinds(EntityHandle entHandle) {
+	Entity *ent = nullptr;
+	ECS_GetEntity_Inner(entHandle, ent);
+	GrBindsHandle_T grBindsHandle_t{static_cast<GrBindsHandle_T>(ent->grBindsHandle)};
+	if (grBindsHandle_t == ECS_UNSET_VAL) return nullptr;
+	return &Comp_GrBinds_BucketContainer.buckets[Buckets_GetBucketIndex(grBindsHandle_t)].compGrBinds[Buckets_GetItemIndex(grBindsHandle_t)];
+}
+
+uint64_t ECS_GetGrBinds_BucketCount() {
+	return Comp_GrBinds_BucketContainer.bucketCounter;
+}
+
+CompGrBinds *ECS_GetGrBinds(uint64_t bucketIndex, uint64_t &itemCount) {
+	if (bucketIndex == Comp_GrBinds_BucketContainer.bucketCounter) {
+		itemCount = Comp_GrBinds_BucketContainer.itemCounter;
+	} else {
+		itemCount = bucketItemCount;
+	}
+	return Comp_GrBinds_BucketContainer.buckets[bucketIndex].compGrBinds;
+}
-- 
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