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# docs.GL

OpenGL 4
OpenGL 3
OpenGL 2

# glCompressedTexImage1D

## Name

glCompressedTexImage1D — specify a one-dimensional texture image in a compressed format

## C Specification

`void glCompressedTexImage1D(` | GLenum | target,
| GLint | level,
| GLenum | internalformat,
| GLsizei | width,
| GLint | border,
| GLsizei | imageSize,
| const GLvoid * | data`)`;

## Parameters

`target`

  Specifies the target texture. Must be `GL_TEXTURE_1D` or `GL_PROXY_TEXTURE_1D`.

`level`

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

`internalformat`

  Specifies the format of the compressed image data stored at address `data`.

`width`

  Specifies the width of the texture image including the border if any. If the GL version does not support non-power-of-two sizes, this value must be 2 n + 2 ⁡ border for some integer n. All implementations support texture images that are at least 64 texels wide. The height of the 1D texture image is 1.

`border`

  Specifies the width of the border. Must be either 0 or 1.

`imageSize`

  Specifies the number of unsigned bytes of image data starting at the address specified by `data`.

`data`

  Specifies a pointer to the compressed image data in memory.

## Description

Texturing maps a portion of a specified texture image onto each graphical primitive for which texturing is enabled. To enable and disable one-dimensional texturing, call glEnable and glDisable with argument `GL_TEXTURE_1D`.

`glCompressedTexImage1D` loads a previously defined, and retrieved, compressed one-dimensional texture image if `target` is `GL_TEXTURE_1D` (see glTexImage1D).

If `target` is `GL_PROXY_TEXTURE_1D`, no data is read from `data`, but all of the texture image state is recalculated, checked for consistency, and checked against the implementation's capabilities. If the implementation cannot handle a texture of the requested texture size, it sets all of the image state to 0, but does not generate an error (see glGetError). To query for an entire mipmap array, use an image array level greater than or equal to 1.

`internalformat` must be extension-specified compressed-texture format. When a texture is loaded with glTexImage1D using a generic compressed texture format (e.g., `GL_COMPRESSED_RGB`) the GL selects from one of its extensions supporting compressed textures. In order to load the compressed texture image using `glCompressedTexImage1D`, query the compressed texture image's size and format using glGetTexLevelParameter.

If a non-zero named buffer object is bound to the `GL_PIXEL_UNPACK_BUFFER` target (see glBindBuffer) while a texture image is specified, `data` is treated as a byte offset into the buffer object's data store.

## Notes

`glCompressedTexImage1D` is available only if the GL version is 1.3 or greater.

Non-power-of-two textures are supported if the GL version is 2.0 or greater, or if the implementation exports the `GL_ARB_texture_non_power_of_two` extension.

## Errors

`GL_INVALID_ENUM` is generated if `internalformat` is one of the generic compressed internal formats: `GL_COMPRESSED_ALPHA`, `GL_COMPRESSED_LUMINANCE`, `GL_COMPRESSED_LUMINANCE_ALPHA`, `GL_COMPRESSED_INTENSITY`, `GL_COMPRESSED_RGB`, or `GL_COMPRESSED_RGBA`.

`GL_INVALID_VALUE` is generated if `imageSize` is not consistent with the format, dimensions, and contents of the specified compressed image data.

`GL_INVALID_OPERATION` is generated if parameter combinations are not supported by the specific compressed internal format as specified in the specific texture compression extension.

`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 `glCompressedTexImage1D` is executed between the execution of glBegin and the corresponding execution of glEnd.

Undefined results, including abnormal program termination, are generated if `data` is not encoded in a manner consistent with the extension specification defining the internal compression format.

## Associated Gets

glGetCompressedTexImage

glGet with argument `GL_TEXTURE_COMPRESSED`

glGet with argument `GL_PIXEL_UNPACK_BUFFER_BINDING`

glGetTexLevelParameter with arguments `GL_TEXTURE_INTERNAL_FORMAT` and `GL_TEXTURE_COMPRESSED_IMAGE_SIZE`

glIsEnabled with argument `GL_TEXTURE_1D`

## See Also

glActiveTexture, glColorTable, glCompressedTexImage2D, glCompressedTexImage3D, glCompressedTexSubImage1D, glCompressedTexSubImage2D, glCompressedTexSubImage3D, glConvolutionFilter1D, glCopyPixels, glCopyTexImage1D, glCopyTexImage2D, glCopyTexSubImage1D, glCopyTexSubImage2D, glCopyTexSubImage3D, glDrawPixels, glMatrixMode, glPixelStore, glPixelTransfer, glTexEnv, glTexGen, glTexImage2D, glTexImage3D, glTexSubImage1D, glTexSubImage2D, glTexSubImage3D, glTexParameter

## Copyright

Copyright © 1991-2006 Silicon Graphics, Inc. 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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