| ptr1 | A pointer to the first memory buffer. This buffer will be swapped with the second one. |
| ptr2 | A pointer to the second memory buffer to swap with the first. Ensure both buffers are correctly allocated and are of equal size. |
| size | The size, in bytes, of the data each buffer holds. This is the number of bytes that will be swapped between the two buffers. |
Swap the content of two memory buffers of the same size.
The MemSwap method exchanges the data between two memory buffers. Each buffer must have the same size for the swap to be valid. This method is efficient for reorganizing data or implementing custom shuffle operations.
When the memory regions overlap, the data from the first buffer is copied to the second, ensuring no data corruption. Be cautious to provide correct pointers and sizes to avoid unintended behavior.
using UnityEngine; using Unity.Collections.LowLevel.Unsafe;
public class MemSwapExample : MonoBehaviour { void Start() { int numElements = 3; int size = numElements * sizeof(float);
// Use stackalloc to allocate memory for two buffers unsafe { float* buffer1 = stackalloc float[numElements]; float* buffer2 = stackalloc float[numElements];
// Initialize buffer1 and buffer2 with distinct values buffer1[0] = 1.1f; buffer1[1] = 2.2f; buffer1[2] = 3.3f; buffer2[0] = 4.4f; buffer2[1] = 5.5f; buffer2[2] = 6.6f;
// Output initial contents of the buffers Debug.Log("Before MemSwap:"); Debug.Log($"Buffer1: {buffer1[0]}, {buffer1[1]}, {buffer1[2]}"); Debug.Log($"Buffer2: {buffer2[0]}, {buffer2[1]}, {buffer2[2]}");
// Swap the contents of buffer1 and buffer2 UnsafeUtility.MemSwap(buffer1, buffer2, size);
// Output swapped contents of the buffers Debug.Log("After MemSwap:"); Debug.Log($"Buffer1: {buffer1[0]}, {buffer1[1]}, {buffer1[2]}"); // Expected: 4.4, 5.5, 6.6 Debug.Log($"Buffer2: {buffer2[0]}, {buffer2[1]}, {buffer2[2]}"); // Expected: 1.1, 2.2, 3.3 } } }
Additional resources: UnsafeUtility.MemCpy.