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# docs.GL

OpenGL 4
OpenGL 3
OpenGL 2
OpenGL ES 3

# glCopyTexSubImage3D

## Name

glCopyTexSubImage3D, glCopyTextureSubImage3D — copy a three-dimensional texture subimage

## C Specification

`void glCopyTexSubImage3D(` | GLenum target,
| GLint level,
| GLint xoffset,
| GLint yoffset,
| GLint zoffset,
| GLint x,
| GLint y,
| GLsizei width,
| GLsizei height`)`;

`void glCopyTextureSubImage3D(` | GLuint texture,
| GLint level,
| GLint xoffset,
| GLint yoffset,
| GLint zoffset,
| GLint x,
| GLint y,
| GLsizei width,
| GLsizei height`)`;

## Parameters

`target`

  Specifies the target to which the texture object is bound for `glCopyTexSubImage3D` function. Must be `GL_TEXTURE_3D` or `GL_TEXTURE_2D_ARRAY`.

`texture`

  Specifies the texture object name for `glCopyTextureSubImage3D` function.

`level`

  Specifies the level-of-detail number. Level 0 is the base image level. Level n is the nth mipmap reduction image.

`xoffset`

  Specifies a texel offset in the x direction within the texture array.

`yoffset`

  Specifies a texel offset in the y direction within the texture array.

`zoffset`

  Specifies a texel offset in the z direction within the texture array.

`x`, `y`

  Specify the window coordinates of the lower left corner of the rectangular region of pixels to be copied.

`width`

  Specifies the width of the texture subimage.

`height`

  Specifies the height of the texture subimage.

## Description

`glCopyTexSubImage3D` and `glCopyTextureSubImage3D` functions replace a rectangular portion of a three-dimensional or two-dimensional array texture image with pixels from the current `GL_READ_BUFFER` (rather than from main memory, as is the case for glTexSubImage3D).

The screen-aligned pixel rectangle with lower left corner at (`x`, `y`) and with width `width` and height `height` replaces the portion of the texture array with x indices `xoffset` through xoffset + width - 1 , inclusive, and y indices `yoffset` through yoffset + height - 1 , inclusive, at z index `zoffset` and at the mipmap level specified by `level`.

The pixels in the rectangle are processed exactly as if glReadPixels had been called, but the process stops just before final conversion. At this point, all pixel component values are clamped to the range 0 1 and then converted to the texture's internal format for storage in the texel array.

The destination rectangle in the texture array may not include any texels outside the texture array as it was originally specified. It is not an error to specify a subtexture with zero width or height, but such a specification has no effect.

If any of the pixels within the specified rectangle of the current `GL_READ_BUFFER` are outside the read window associated with the current rendering context, then the values obtained for those pixels are undefined.

No change is made to the internalformat, width, height, depth, or border parameters of the specified texture array or to texel values outside the specified subregion.

## Notes

glPixelStore modes affect texture images.

## Errors

`GL_INVALID_ENUM` is generated by `glCopyTexSubImage3D` if `target` is not `GL_TEXTURE_3D`, `GL_TEXTURE_2D_ARRAY` or `GL_TEXTURE_CUBE_MAP_ARRAY`.

`GL_INVALID_OPERATION` is generated by `glCopyTextureSubImage3D` if the effective target is not `GL_TEXTURE_3D`, `GL_TEXTURE_2D_ARRAY`, `GL_TEXTURE_CUBE_MAP_ARRAY` or `GL_TEXTURE_CUBE_MAP`.

`GL_INVALID_FRAMEBUFFER_OPERATION` is generated if the object bound to `GL_READ_FRAMEBUFFER_BINDING` is not framebuffer complete.

`GL_INVALID_OPERATION` is generated if the texture array has not been defined by a previous glTexImage3D or glTexStorage3D operation.

`GL_INVALID_OPERATION` is generated by `glCopyTextureSubImage3D` if `texture` is not the name of an existing texture object.

`GL_INVALID_VALUE` is generated if `level` is less than 0.

`GL_INVALID_VALUE` may be generated if level > log 2 ⁡ max , where max is the returned value of `GL_MAX_3D_TEXTURE_SIZE` if `target` is `GL_TEXTURE_3D` or the returned value of `GL_MAX_ARRAY_TEXTURE_LAYERS` if `target` is `GL_TEXTURE_2D_ARRAY`.

`GL_INVALID_VALUE` is generated if xoffset < 0 , xoffset + width > w , yoffset < 0 , yoffset + height > h , zoffset < 0 , or zoffset + 1 > d , where w is the `GL_TEXTURE_WIDTH`, h is the `GL_TEXTURE_HEIGHT`, d is the `GL_TEXTURE_DEPTH` and of the texture image being modified. Note that w, h, and d include twice the border width.

`GL_INVALID_OPERATION` is generated if:

- the read buffer is `GL_NONE`, or

- the value of `GL_READ_FRAMEBUFFER_BINDING` is non-zero, and:

  - the read buffer selects an attachment that has no image attached, or

  - the effective value of `GL_SAMPLE_BUFFERS` for the read framebuffer is one.

## Associated Gets

glGetTexImage

## Version Support

| OpenGL Version
--- | ---
Function / Feature Name | 2.0 | 2.1 | 3.0 | 3.1 | 3.2 | 3.3 | 4.0 | 4.1 | 4.2 | 4.3 | 4.4 | 4.5
`glCopyTexSubImage3D` | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔
`glCopyTextureSubImage3D` | - | - | - | - | - | - | - | - | - | - | - | ✔

## See Also

glCopyTexImage1D, glCopyTexImage2D, glCopyTexSubImage1D, glCopyTexSubImage2D, glPixelStore, glReadBuffer, glTexImage1D, glTexImage2D, glTexImage3D, glTexParameter, glTexSubImage1D, glTexSubImage2D, glTexSubImage3D

## Copyright

Copyright © 1991-2006 Silicon Graphics, Inc. Copyright © 2012-2014 Khronos Group. This document is licensed under the SGI Free Software B License. For details, see https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/.

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