public unsafe void EntityInChunkCompareTo_Low32BitsMatch_ComparesCorrectly()
{
// Create a valid Entity and get its EntityInChunk:
var ent1 = m_Manager.CreateEntity(typeof(EcsTestData));
var eic1 = m_Manager.EntityComponentStore->GetEntityInChunk(ent1);
// Construct an artificial EntityInChunk for a hypothetical entity in a hypothetical
// Chunk, exactly 2^32 bytes higher than ent1's (such that comparing only 32 bits of
// the chunk pointer would fail):
var eic2 = new EntityInChunk
{
Chunk = (Chunk *)((ulong)eic1.Chunk + (1ul << 32)),
IndexInChunk = eic1.IndexInChunk,
};
Assert.Greater((ulong)eic2.Chunk, (ulong)eic1.Chunk);
Assert.AreEqual((int)eic2.Chunk, (int)eic1.Chunk);
// Make sure the EntityInChunks sort correctly (eic2 > eic1):
Assert.Greater(eic2.CompareTo(eic1), 0);
Assert.Less(eic1.CompareTo(eic2), 0);
}
public unsafe void EntityInChunkCompareTo_DifferenceOverflows32Bits_ComparesCorrectly()
{
// Create a valid Entity and get its EntityInChunk:
var ent1 = m_Manager.CreateEntity(typeof(EcsTestData));
var eic1 = m_Manager.EntityComponentStore->GetEntityInChunk(ent1);
// Construct an artificial EntityInChunk for a hypothetical entity in a hypothetical
// Chunk, whose pointer is just above 2^31 larger than ent1's (such that using lhs-rhs as the
// CompareTo result would overflow a signed int and give an incorrect result):
var eic2 = new EntityInChunk
{
Chunk = (Chunk *)((ulong)eic1.Chunk + (1ul << 31) + 65536),
IndexInChunk = eic1.IndexInChunk,
};
Assert.Greater((ulong)eic2.Chunk, (ulong)eic1.Chunk);
Assert.Less((int)((ulong)eic2.Chunk - (ulong)eic1.Chunk), 0);
// Make sure the EntityInChunks sort correctly (eic2 > eic1):
Assert.Greater(eic2.CompareTo(eic1), 0);
Assert.Less(eic1.CompareTo(eic2), 0);
}
public EntityInfo(Entity entity, EntityInChunk entityInChunk)
{
Entity = entity;
EntityInChunk = entityInChunk;
}
