1991-2006
Silicon Graphics, Inc.
glGetTexParameter
3G

# glGetTexParameter

return texture parameter values

## C Specification

                    void glGetTexParameterfv
                    GLenum target
                    GLenum pname
                    GLfloat * params

                    void glGetTexParameteriv
                    GLenum target
                    GLenum pname
                    GLint * params

## Parameters

`target`

  Specifies the symbolic name of the target texture. `GL_TEXTURE_1D`, `GL_TEXTURE_2D`, `GL_TEXTURE_3D`, and `GL_TEXTURE_CUBE_MAP` are accepted.

`pname`

  Specifies the symbolic name of a texture parameter. `GL_TEXTURE_MAG_FILTER`, `GL_TEXTURE_MIN_FILTER`, `GL_TEXTURE_MIN_LOD`, `GL_TEXTURE_MAX_LOD`, `GL_TEXTURE_BASE_LEVEL`, `GL_TEXTURE_MAX_LEVEL`, `GL_TEXTURE_WRAP_S`, `GL_TEXTURE_WRAP_T`, `GL_TEXTURE_WRAP_R`, `GL_TEXTURE_BORDER_COLOR`, `GL_TEXTURE_PRIORITY`, `GL_TEXTURE_RESIDENT`, `GL_TEXTURE_COMPARE_MODE`, `GL_TEXTURE_COMPARE_FUNC`, `GL_DEPTH_TEXTURE_MODE`, and `GL_GENERATE_MIPMAP` are accepted.

`params`

  Returns the texture parameters.

## Description

`glGetTexParameter` returns in `params` the value or values of the texture parameter specified as `pname`. `target` defines the target texture, either `GL_TEXTURE_1D`, `GL_TEXTURE_2D`, `GL_TEXTURE_3D`, or `GL_TEXTURE_CUBE_MAP`, to specify one-, two-, or three-dimensional or cube-mapped texturing. `pname` accepts the same symbols as glTexParameter, with the same interpretations:

`GL_TEXTURE_MAG_FILTER`

  Returns the single-valued texture magnification filter, a symbolic constant. The initial value is `GL_LINEAR`.

`GL_TEXTURE_MIN_FILTER`

  Returns the single-valued texture minification filter, a symbolic constant. The initial value is `GL_NEAREST_MIPMAP_LINEAR`.

`GL_TEXTURE_MIN_LOD`

  Returns the single-valued texture minimum level-of-detail value. The initial value is -1000 .

`GL_TEXTURE_MAX_LOD`

  Returns the single-valued texture maximum level-of-detail value. The initial value is 1000.

`GL_TEXTURE_BASE_LEVEL`

  Returns the single-valued base texture mipmap level. The initial value is 0.

`GL_TEXTURE_MAX_LEVEL`

  Returns the single-valued maximum texture mipmap array level. The initial value is 1000.

`GL_TEXTURE_WRAP_S`

  Returns the single-valued wrapping function for texture coordinate s, a symbolic constant. The initial value is `GL_REPEAT`.

`GL_TEXTURE_WRAP_T`

  Returns the single-valued wrapping function for texture coordinate t, a symbolic constant. The initial value is `GL_REPEAT`.

`GL_TEXTURE_WRAP_R`

  Returns the single-valued wrapping function for texture coordinate r, a symbolic constant. The initial value is `GL_REPEAT`.

`GL_TEXTURE_BORDER_COLOR`

  Returns four integer or floating-point numbers that comprise the RGBA color of the texture border. Floating-point values are returned in the range 0 1 . Integer values are returned as a linear mapping of the internal floating-point representation such that 1.0 maps to the most positive representable integer and -1.0 maps to the most negative representable integer. The initial value is (0, 0, 0, 0).

`GL_TEXTURE_PRIORITY`

  Returns the residence priority of the target texture (or the named texture bound to it). The initial value is 1. See glPrioritizeTextures.

`GL_TEXTURE_RESIDENT`

  Returns the residence status of the target texture. If the value returned in `params` is `GL_TRUE`, the texture is resident in texture memory. See glAreTexturesResident.

`GL_TEXTURE_COMPARE_MODE`

  Returns a single-valued texture comparison mode, a symbolic constant. The initial value is `GL_NONE`. See glTexParameter.

`GL_TEXTURE_COMPARE_FUNC`

  Returns a single-valued texture comparison function, a symbolic constant. The initial value is `GL_LEQUAL`. See glTexParameter.

`GL_DEPTH_TEXTURE_MODE`

  Returns a single-valued texture format indicating how the depth values should be converted into color components. The initial value is `GL_LUMINANCE`. See glTexParameter.

`GL_GENERATE_MIPMAP`

  Returns a single boolean value indicating if automatic mipmap level updates are enabled. See glTexParameter.

## Notes

`GL_TEXTURE_PRIORITY` and `GL_TEXTURE_RESIDENT` are available only if the GL version is 1.1 or greater.

`GL_TEXTURE_3D`, `GL_TEXTURE_MIN_LOD`, `GL_TEXTURE_MAX_LOD`, `GL_TEXTURE_BASE_LEVEL`, `GL_TEXTURE_MAX_LEVEL`, and `GL_TEXTURE_WRAP_R` are available only if the GL version is 1.2 or greater.

`GL_TEXTURE_COMPARE_MODE`, `GL_TEXTURE_COMPARE_FUNC`, and `GL_GENERATE_MIPMAP` is available only if the GL version is 1.4 or greater.

If an error is generated, no change is made to the contents of `params`.

## Errors

`GL_INVALID_ENUM` is generated if `target` or `pname` is not an accepted value.

`GL_INVALID_OPERATION` is generated if `glGetTexParameter` is executed between the execution of glBegin and the corresponding execution of glEnd.

## See Also

glAreTexturesResident, glPrioritizeTextures, glTexParameter

## Copyright

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