---
title: "copy(from:sourceSlice:sourceLevel:to:destinationSlice:destinationLevel:sliceCount:levelCount:)"
framework: metal
role: symbol
role_heading: Instance Method
path: "metal/mtlblitcommandencoder/copy(from:sourceslice:sourcelevel:to:destinationslice:destinationlevel:slicecount:levelcount:)"
---

# copy(from:sourceSlice:sourceLevel:to:destinationSlice:destinationLevel:sliceCount:levelCount:)

Encodes a command that copies slices of a texture to another texture’s slices.

## Declaration

```swift
func copy(from sourceTexture: any MTLTexture, sourceSlice: Int, sourceLevel: Int, to destinationTexture: any MTLTexture, destinationSlice: Int, destinationLevel: Int, sliceCount: Int, levelCount: Int)
```

## Parameters

- `sourceTexture`: A texture the command copies data from.
- `sourceSlice`: A slice within sourceTexture the command uses as a starting point to copy data from. Set this to 0 if sourceTexture isn’t a texture array or a cube texture.
- `sourceLevel`: A mipmap level within sourceTexture.
- `destinationTexture`: Another texture the command copies the data to that has the same pixel format and sample count as sourceTexture.
- `destinationSlice`: A slice within destinationTexture the command uses as its starting point for coping data. Set this to 0 if destinationTexture isn’t a texture array or a cube texture.
- `destinationLevel`: A mipmap level within destinationTexture that has the same size as the source texture’s sourceLevel mipmap.
- `sliceCount`: The number of slices the command copies so that it satisfies these conditions: The sum of sourceLevel and sourceSlice doesn’t exceed the number of slices in sourceTexture. The sum of destinationLevel and destinationSlice doesn’t exceed the number of slices in destinationTexture.
- `levelCount`: The number of mipmap levels the command copies so that it satisfies these conditions: The sum of levelCount and sourceLevel doesn’t exceed the number of mipmap levels in sourceTexture. The sum of levelCount and destinationLevel doesn’t exceed the number of mipmap levels in destinationTexture.

## Mentioned in

Copying data into or out of mipmaps

## See Also

### Copying texture data to another texture

- [copy(from:to:)](metal/mtlblitcommandencoder/copy(from:to:).md)
- [copy(from:sourceSlice:sourceLevel:sourceOrigin:sourceSize:to:destinationSlice:destinationLevel:destinationOrigin:)](metal/mtlblitcommandencoder/copy(from:sourceslice:sourcelevel:sourceorigin:sourcesize:to:destinationslice:destinationlevel:destinationorigin:).md)
- [copy(from:sourceOrigin:sourceDimensions:to:destinationOrigin:destinationDimensions:)](metal/mtlblitcommandencoder/copy(from:sourceorigin:sourcedimensions:to:destinationorigin:destinationdimensions:).md)