GLGETTEXPARAMETER(3G)

NAME
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/.