## Name

glTexSubImage2D, glTextureSubImage2D — specify a two-dimensional texture subimage

## C Specification

`void glTexSubImage2D(` | GLenum target,
| GLint level,
| GLint xoffset,
| GLint yoffset,
| GLsizei width,
| GLsizei height,
| GLenum format,
| GLenum type,
| const GLvoid * pixels`)`;

`void glTextureSubImage2D(` | GLuint texture,
| GLint level,
| GLint xoffset,
| GLint yoffset,
| GLsizei width,
| GLsizei height,
| GLenum format,
| GLenum type,
| const void *pixels`)`;

## Parameters

`target`

  Specifies the target to which the texture is bound for `glTexSubImage2D`. Must be `GL_TEXTURE_2D`, `GL_TEXTURE_CUBE_MAP_POSITIVE_X`, `GL_TEXTURE_CUBE_MAP_NEGATIVE_X`, `GL_TEXTURE_CUBE_MAP_POSITIVE_Y`, `GL_TEXTURE_CUBE_MAP_NEGATIVE_Y`, `GL_TEXTURE_CUBE_MAP_POSITIVE_Z`, `GL_TEXTURE_CUBE_MAP_NEGATIVE_Z`, or `GL_TEXTURE_1D_ARRAY`.

`texture`

  Specifies the texture object name for `glTextureSubImage2D`. The effective target of `texture` must be one of the valid `target` values above.

`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.

`width`

  Specifies the width of the texture subimage.

`height`

  Specifies the height of the texture subimage.

`format`

  Specifies the format of the pixel data. The following symbolic values are accepted: `GL_RED`, `GL_RG`, `GL_RGB`, `GL_BGR`, `GL_RGBA`, `GL_BGRA`, `GL_DEPTH_COMPONENT`, and `GL_STENCIL_INDEX`.

`type`

  Specifies the data type of the pixel data. The following symbolic values are accepted: `GL_UNSIGNED_BYTE`, `GL_BYTE`, `GL_UNSIGNED_SHORT`, `GL_SHORT`, `GL_UNSIGNED_INT`, `GL_INT`, `GL_FLOAT`, `GL_UNSIGNED_BYTE_3_3_2`, `GL_UNSIGNED_BYTE_2_3_3_REV`, `GL_UNSIGNED_SHORT_5_6_5`, `GL_UNSIGNED_SHORT_5_6_5_REV`, `GL_UNSIGNED_SHORT_4_4_4_4`, `GL_UNSIGNED_SHORT_4_4_4_4_REV`, `GL_UNSIGNED_SHORT_5_5_5_1`, `GL_UNSIGNED_SHORT_1_5_5_5_REV`, `GL_UNSIGNED_INT_8_8_8_8`, `GL_UNSIGNED_INT_8_8_8_8_REV`, `GL_UNSIGNED_INT_10_10_10_2`, and `GL_UNSIGNED_INT_2_10_10_10_REV`.

`pixels`

  Specifies a pointer to the image data in memory.

## Description

Texturing maps a portion of a specified texture image onto each graphical primitive for which texturing is enabled.

`glTexSubImage2D` and `glTextureSubImage2D` redefine a contiguous subregion of an existing two-dimensional or one-dimensional array texture image. The texels referenced by `pixels` replace the portion of the existing texture array with x indices `xoffset` and xoffset + width - 1 , inclusive, and y indices `yoffset` and yoffset + height - 1 , inclusive. This region may not include any texels outside the range of 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 a non-zero named buffer object is bound to the `GL_PIXEL_UNPACK_BUFFER` target (see glBindBuffer) while a texture image is specified, `pixels` is treated as a byte offset into the buffer object's data store.

## Notes

glPixelStore modes affect texture images.

`glTexSubImage2D` and `glTextureSubImage3D` specify a two-dimensional subtexture for the current texture unit, specified with glActiveTexture.

`GL_STENCIL_INDEX` is accepted for `format` only if the GL version is 4.4 or higher.

## Errors

`GL_INVALID_ENUM` is generated if `target` or the effective target of `texture` is not `GL_TEXTURE_2D`, `GL_TEXTURE_CUBE_MAP_POSITIVE_X`, `GL_TEXTURE_CUBE_MAP_NEGATIVE_X`, `GL_TEXTURE_CUBE_MAP_POSITIVE_Y`, `GL_TEXTURE_CUBE_MAP_NEGATIVE_Y`, `GL_TEXTURE_CUBE_MAP_POSITIVE_Z`, `GL_TEXTURE_CUBE_MAP_NEGATIVE_Z`, or `GL_TEXTURE_1D_ARRAY`.

`GL_INVALID_OPERATION` is generated by `glTextureSubImage2D` if `texture` is not the name of an existing texture object.

`GL_INVALID_ENUM` is generated if `format` is not an accepted format constant.

`GL_INVALID_ENUM` is generated if `type` is not a type constant.

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

`GL_INVALID_VALUE` may be generated if `level` is greater than log 2 max, where max is the returned value of `GL_MAX_TEXTURE_SIZE`.

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

`GL_INVALID_VALUE` is generated if `width` or `height` is less than 0.

`GL_INVALID_OPERATION` is generated if the texture array has not been defined by a previous glTexImage2D operation.

`GL_INVALID_OPERATION` is generated if `type` is one of `GL_UNSIGNED_BYTE_3_3_2`, `GL_UNSIGNED_BYTE_2_3_3_REV`, `GL_UNSIGNED_SHORT_5_6_5`, or `GL_UNSIGNED_SHORT_5_6_5_REV` and `format` is not `GL_RGB`.

`GL_INVALID_OPERATION` is generated if `type` is one of `GL_UNSIGNED_SHORT_4_4_4_4`, `GL_UNSIGNED_SHORT_4_4_4_4_REV`, `GL_UNSIGNED_SHORT_5_5_5_1`, `GL_UNSIGNED_SHORT_1_5_5_5_REV`, `GL_UNSIGNED_INT_8_8_8_8`, `GL_UNSIGNED_INT_8_8_8_8_REV`, `GL_UNSIGNED_INT_10_10_10_2`, or `GL_UNSIGNED_INT_2_10_10_10_REV` and `format` is neither `GL_RGBA` nor `GL_BGRA`.

`GL_INVALID_OPERATION` is generated if `format` is `GL_STENCIL_INDEX` and the base internal format is not `GL_STENCIL_INDEX`.

`GL_INVALID_OPERATION` is generated if a non-zero buffer object name is bound to the `GL_PIXEL_UNPACK_BUFFER` target and the buffer object's data store is currently mapped.

`GL_INVALID_OPERATION` is generated if a non-zero buffer object name is bound to the `GL_PIXEL_UNPACK_BUFFER` target and the data would be unpacked from the buffer object such that the memory reads required would exceed the data store size.

`GL_INVALID_OPERATION` is generated if a non-zero buffer object name is bound to the `GL_PIXEL_UNPACK_BUFFER` target and `pixels` is not evenly divisible into the number of bytes needed to store in memory a datum indicated by `type`.

## Associated Gets

glGetTexImage

glGet with argument `GL_PIXEL_UNPACK_BUFFER_BINDING`

## 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
`glTexSubImage2D` | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔
`glTextureSubImage2D` | - | - | - | - | - | - | - | - | - | - | - | ✔

## See Also

glActiveTexture, glCopyTexImage1D, glCopyTexImage2D, glCopyTexSubImage1D, glCopyTexSubImage2D, glCopyTexSubImage3D, glPixelStore, glTexImage1D, glTexImage2D, glTexImage3D, glTexSubImage1D, glTexSubImage3D, glTexParameter

## Copyright

Copyright © 1991-2006 Silicon Graphics, Inc. Copyright © 2010-2014 Khronos Group. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.