From 4cd5b991a6c4cd3bd8f052a052df03485f1d8526 Mon Sep 17 00:00:00 2001
From: Jonathan Bradley <jcb@pikum.xyz>
Date: Fri, 20 Oct 2023 16:26:16 -0400
Subject: add bullet dependency first pass

---
 src/ecs.cpp | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'src/ecs.cpp')

diff --git a/src/ecs.cpp b/src/ecs.cpp
index b4207f8..17c5a89 100644
--- a/src/ecs.cpp
+++ b/src/ecs.cpp
@@ -1,9 +1,12 @@
 
 #include "ecs.hpp"
 
+#include "memory.hpp"
 #include "vendor/glm_include.hpp"
 #include "window.hpp"
 
+#include <btBulletDynamicsCommon.h>
+
 TypeSafeInt_B(EntityHandle);
 const uint64_t maxBucketItemCount = 256;
 
@@ -28,6 +31,13 @@ BucketContainer<EntityBucket, EntityHandle_T> Entities_BucketContainer{};
 BucketContainer<GrBindsBucket, GrBindsHandle_T> Comp_GrBinds_BucketContainer{};
 BucketContainer<InstanceBucket, InstanceHandle_T> Comp_Instance_BucketContainer{};
 
+MemBucket *bulletBucket = nullptr;
+btDefaultCollisionConfiguration *btConfiguration = nullptr;
+btCollisionDispatcher *btDispatcher = nullptr;
+btBroadphaseInterface *btBroadphase = nullptr;
+btConstraintSolver *btSolver = nullptr;
+btDiscreteDynamicsWorld *btDynamicsWorld = nullptr;
+
 void ECS_GetEntity_Inner(EntityHandle entHandle, Entity*& ent) {
 	EntityHandle_T entHandle_t{static_cast<EntityHandle_T>(entHandle)};
 	assert(entHandle_t != EntityHandle_T_MAX && "Unknown entity handle");
@@ -40,6 +50,18 @@ void ECS_Init() {
 	Buckets_Init(Entities_BucketContainer);
 	Buckets_Init(Comp_GrBinds_BucketContainer);
 	Buckets_Init(Comp_Instance_BucketContainer);
+	// bullet
+	{
+		bulletBucket = Pke_BeginTransientBucket();
+		btConfiguration = Pke_New<btDefaultCollisionConfiguration>(bulletBucket);
+		btDispatcher = Pke_New<btCollisionDispatcher>(bulletBucket);
+		new (btDispatcher) btCollisionDispatcher(btConfiguration);
+		btBroadphase = Pke_New<btDbvtBroadphase>(bulletBucket);
+		btSolver = Pke_New<btSequentialImpulseConstraintSolver>(bulletBucket);
+		btDynamicsWorld = Pke_New<btDiscreteDynamicsWorld>(bulletBucket);
+		new (btDynamicsWorld) btDiscreteDynamicsWorld(btDispatcher, btBroadphase, btSolver, btConfiguration);
+		btDynamicsWorld->setGravity(btVector3(0, -1, 0));
+	}
 }
 
 uint64_t ECS_GetEntities_BucketCount() {
@@ -401,6 +423,7 @@ CompInstance *ECS_GetInstances(uint64_t bucketIndex, uint64_t &itemCount) {
 }
 
 void ECS_Teardown() {
+	Pke_EndTransientBucket(bulletBucket);
 	EntitiesWithExcessInstances.~DynArray();
 	entitiesYetToBeRemoved.~DynArray();
 	EntitiesToBeRemoved.~DynArray();
-- 
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