From fa7fc343a0e444da72938fad58d219cf52228976 Mon Sep 17 00:00:00 2001
From: Jonathan Bradley <jcb@pikum.xyz>
Date: Thu, 21 Dec 2023 17:44:03 -0500
Subject: plugin checkpoint - multiple plugins and collision callbacks

---
 src/ecs.cpp | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

(limited to 'src/ecs.cpp')

diff --git a/src/ecs.cpp b/src/ecs.cpp
index 4580abe..c33caaa 100644
--- a/src/ecs.cpp
+++ b/src/ecs.cpp
@@ -327,6 +327,57 @@ void ECS_Tick_Late(double delta) {
 	}
 }
 
+void FindComponents(EntityHandle handle, Entity *&ent, CompInstance *&compInst, CompGrBinds *&grBinds) {
+	ECS_GetEntity_Inner(handle, ent);
+	if (ent == nullptr)
+		return;
+	GrBindsHandle grBindsHandle = ent->grBindsHandle;
+	if (ent->instanceHandle != InstanceHandle_MAX) {
+		compInst = &Comp_Instance_BucketContainer.buckets[ent->instanceHandle.bucketIndex].instances[ent->instanceHandle.itemIndex];
+		if (grBindsHandle == GrBindsHandle_MAX)
+			grBindsHandle = compInst->grBindsHandle;
+	}
+	if (grBindsHandle != GrBindsHandle_MAX) {
+		grBinds = &Comp_GrBinds_BucketContainer.buckets[grBindsHandle.bucketIndex].compGrBinds[grBindsHandle.itemIndex];
+	}
+}
+
+void ECS_HandleCollision(EntityHandle lhs, EntityHandle rhs) {
+	Entity *lhsEnt = nullptr;
+	CompInstance *lhsInst = nullptr;
+	CompGrBinds *lhsGrBinds = nullptr;
+	FindComponents(lhs, lhsEnt, lhsInst, lhsGrBinds);
+
+	Entity *rhsEnt = nullptr;
+	CompInstance *rhsInst = nullptr;
+	CompGrBinds *rhsGrBinds = nullptr;
+	FindComponents(rhs, rhsEnt, rhsInst, rhsGrBinds);
+
+	void (*lhsColFunc)(EntityHandle, EntityHandle) = nullptr;
+	void (*rhsColFunc)(EntityHandle, EntityHandle) = nullptr;
+
+	if (lhsInst && lhsInst->collisionCallback.func != nullptr) {
+		lhsColFunc = reinterpret_cast<void (*)(EntityHandle, EntityHandle)>(lhsInst->collisionCallback.func);
+	}
+	if (lhsColFunc == nullptr && lhsGrBinds && lhsGrBinds->collisionCallback.func) {
+		lhsColFunc = reinterpret_cast<void (*)(EntityHandle, EntityHandle)>(lhsGrBinds->collisionCallback.func);
+	}
+
+	if (rhsInst && rhsInst->collisionCallback.func != nullptr) {
+		rhsColFunc = reinterpret_cast<void (*)(EntityHandle, EntityHandle)>(rhsInst->collisionCallback.func);
+	}
+	if (rhsColFunc == nullptr && rhsGrBinds && rhsGrBinds->collisionCallback.func) {
+		rhsColFunc = reinterpret_cast<void (*)(EntityHandle, EntityHandle)>(rhsGrBinds->collisionCallback.func);
+	}
+
+	if (lhsColFunc) {
+		lhsColFunc(lhs, rhs);
+	}
+	if (rhsColFunc) {
+		rhsColFunc(lhs, rhs);
+	}
+}
+
 CompGrBinds &ECS_CreateGrBinds(EntityHandle entHandle) {
 	assert(entHandle != EntityHandle_MAX);
 
-- 
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