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MemCpyReplicate(void*, void*, int, int)

Copies memory from a source to a destination and replicates it multiple times.
Read time 1 minuteLast updated 12 days ago

Definition

public static void MemCpyReplicate(void* destination, void* source, int size, int count)

Parameters

destination

void*
A pointer to the destination memory block. Ensure this block has enough space to hold the replicated data.

source

void*
A pointer to the source memory block. This block should contain the data you want to replicate.

size

int
The size, in bytes, of the data block to copy and replicate. This specifies the number of bytes that are replicated each time.

count

int
The number of times to replicate the source data block in the destination buffer.

Remarks

The 
MemCpyReplicate
method copies a specified block of memory from a source location and replicates that block multiple times into a destination location. This is useful for quickly initializing a large buffer with repeated values, such as setting up constant buffers or initializing large arrays with repeated patterns.
using UnityEngine;using Unity.Collections.LowLevel.Unsafe;public class MemCpyReplicateExample : MonoBehaviour{    void Start()    {        int elementCount = 3;        int replicateCount = 4;        int dataSize = elementCount * sizeof(float);        // Use stackalloc to allocate memory for source and destination buffers        unsafe        {            float* srcBuffer = stackalloc float[elementCount];            float* dstBuffer = stackalloc float[elementCount * replicateCount];            // Initialize the source buffer with multiple values            srcBuffer[0] = 1.1f;            srcBuffer[1] = 2.2f;            srcBuffer[2] = 3.3f;            // Use MemCpyReplicate to copy and replicate the source values into the destination            UnsafeUtility.MemCpyReplicate(dstBuffer, srcBuffer, dataSize, replicateCount);            // Output the contents of the destination buffer to verify replication            Debug.Log("Contents of destination buffer after MemCpyReplicate:");            for (int i = 0; i < elementCount * replicateCount; i++)            {                Debug.Log(dstBuffer[i]);  // Expected pattern: 1.1, 2.2, 3.3 repeated            }        }    }}
Additional Resources: UnsafeUtility.MemCpy.