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);

void glGetTexParameterIiv(GLenum target, GLenum pname, GLint * params);

void glGetTexParameterIuiv(GLenum target, GLenum pname, GLuint * params);

void glGetTextureParameterfv(GLuint texture, GLenum pname, GLfloat *params);

void glGetTextureParameteriv(GLuint texture, GLenum pname, GLint *params);

void glGetTextureParameterIiv(GLuint texture, GLenum pname, GLint *params);

void glGetTextureParameterIuiv(GLuint texture, GLenum pname, GLuint *params);

PARAMETERS

target
    Specifies the target to which the texture is bound for glGetTexParameterfv, glGetTexParameteriv, glGetTexParameterIiv, and glGetTexParameterIuiv functions. GL_TEXTURE_1D, GL_TEXTURE_1D_ARRAY, GL_TEXTURE_2D, GL_TEXTURE_2D_ARRAY, GL_TEXTURE_2D_MULTISAMPLE, GL_TEXTURE_2D_MULTISAMPLE_ARRAY, GL_TEXTURE_3D, GL_TEXTURE_CUBE_MAP, GL_TEXTURE_RECTANGLE, and GL_TEXTURE_CUBE_MAP_ARRAY are accepted.

texture
    Specifies the texture object name for glGetTextureParameterfv, glGetTextureParameteriv, glGetTextureParameterIiv, and glGetTextureParameterIuiv functions.

pname
    Specifies the symbolic name of a texture parameter. GL_DEPTH_STENCIL_TEXTURE_MODE, GL_IMAGE_FORMAT_COMPATIBILITY_TYPE, GL_TEXTURE_BASE_LEVEL, GL_TEXTURE_BORDER_COLOR, GL_TEXTURE_COMPARE_MODE, GL_TEXTURE_COMPARE_FUNC, GL_TEXTURE_IMMUTABLE_FORMAT, GL_TEXTURE_IMMUTABLE_LEVELS, GL_TEXTURE_LOD_BIAS, GL_TEXTURE_MAG_FILTER, GL_TEXTURE_MAX_LEVEL, GL_TEXTURE_MAX_LOD, GL_TEXTURE_MIN_FILTER, GL_TEXTURE_MIN_LOD, GL_TEXTURE_SWIZZLE_R, GL_TEXTURE_SWIZZLE_G, GL_TEXTURE_SWIZZLE_B, GL_TEXTURE_SWIZZLE_A, GL_TEXTURE_SWIZZLE_RGBA, GL_TEXTURE_TARGET, GL_TEXTURE_VIEW_MIN_LAYER, GL_TEXTURE_VIEW_MIN_LEVEL, GL_TEXTURE_VIEW_NUM_LAYERS, GL_TEXTURE_VIEW_NUM_LEVELS, GL_TEXTURE_WRAP_S, GL_TEXTURE_WRAP_T, and GL_TEXTURE_WRAP_R are accepted.

params
    Returns the texture parameters.

DESCRIPTION

glGetTexParameter and glGetTextureParameter return in params the value or values of the texture parameter specified as pname. target defines the target texture. GL_TEXTURE_1D, GL_TEXTURE_2D, GL_TEXTURE_3D, GL_TEXTURE_1D_ARRAY, GL_TEXTURE_2D_ARRAY, GL_TEXTURE_RECTANGLE, GL_TEXTURE_CUBE_MAP, GL_TEXTURE_CUBE_MAP_ARRAY, GL_TEXTURE_2D_MULTISAMPLE, or GL_TEXTURE_2D_MULTISAMPLE_ARRAY specify one-, two-, or three-dimensional, one-dimensional array, two-dimensional array, rectangle, cube-mapped or cube-mapped array, two-dimensional multisample, or two-dimensional multisample array texturing, respectively. pname accepts the same symbols as glTexParameter(), with the same interpretations:

GL_DEPTH_STENCIL_TEXTURE_MODE
    Returns the single-value depth stencil texture mode, a symbolic constant. The initial value is GL_DEPTH_COMPONENT.

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_SWIZZLE_R
    Returns the red component swizzle. The initial value is GL_RED.

GL_TEXTURE_SWIZZLE_G
    Returns the green component swizzle. The initial value is GL_GREEN.

GL_TEXTURE_SWIZZLE_B
    Returns the blue component swizzle. The initial value is GL_BLUE.

GL_TEXTURE_SWIZZLE_A
    Returns the alpha component swizzle. The initial value is GL_ALPHA.

GL_TEXTURE_SWIZZLE_RGBA
    Returns the component swizzle for all channels in a single query.

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_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_TEXTURE_VIEW_MIN_LEVEL
    Returns a single-valued base level of a texture view relative to its parent. The initial value is 0. See glTextureView().

GL_TEXTURE_VIEW_NUM_LEVELS
    Returns a single-valued number of levels of detail of a texture view. See glTextureView().

GL_TEXTURE_VIEW_MIN_LAYER
    Returns a single-valued first level of a texture array view relative to its parent. See glTextureView().

GL_TEXTURE_VIEW_NUM_LAYERS
    Returns a single-valued number of layers in a texture array view. See glTextureView().

GL_TEXTURE_IMMUTABLE_LEVELS
    Returns a single-valued number of immutable texture levels in a texture view. See glTextureView().

In addition to the parameters that may be set with glTexParameter(), glGetTexParameter and glGetTextureParameter accept the following read-only parameters:

GL_IMAGE_FORMAT_COMPATIBILITY_TYPE
    Returns the matching criteria use for the texture when used as an image texture. Can return GL_IMAGE_FORMAT_COMPATIBILITY_BY_SIZE, GL_IMAGE_FORMAT_COMPATIBILITY_BY_CLASS or GL_NONE.

GL_TEXTURE_IMMUTABLE_FORMAT
    Returns non-zero if the texture has an immutable format. Textures become immutable if their storage is specified with glTexStorage1D(), glTexStorage2D() or glTexStorage3D(). The initial value is GL_FALSE.

GL_TEXTURE_TARGET
    Returns the effective target of the texture object. For glGetTex*Parameter functions, this is the target parameter. For glGetTextureParameter*, it is the target to which the texture was initially bound when it was created, or the value of the target parameter to the call to glCreateTextures which created the texture.

NOTES

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

GL_IMAGE_FORMAT_COMPATIBILITY_TYPE is available only if the GL version is 4.2 or greater.

GL_DEPTH_STENCIL_TEXTURE_MODE, GL_TEXTURE_VIEW_MIN_LEVEL, GL_TEXTURE_VIEW_NUM_LEVELS, GL_TEXTURE_VIEW_MIN_LAYER, GL_TEXTURE_VIEW_NUM_LAYERS and GL_TEXTURE_IMMUTABLE_LEVELS are available only if the GL version is 4.3 or greater.

GL_TEXTURE_TARGET are available only if the GL version is 4.5 or greater.

ERRORS

GL_INVALID_ENUM is generated if pname is not an accepted value.

GL_INVALID_ENUM error is generated by glGetTexParameter if the effective target is not one of the accepted texture targets.

GL_INVALID_OPERATION is generated by glGetTextureParameter* if texture is not the name of an existing texture object.

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
glGetTexParameterIiv | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔
glGetTexParameterIuiv | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔
glGetTexParameterfv | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔
glGetTexParameteriv | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔
glGetTextureParameterIiv | - | - | - | - | - | - | - | - | - | - | - | ✔
glGetTextureParameterIuiv | - | - | - | - | - | - | - | - | - | - | - | ✔
glGetTextureParameterfv | - | - | - | - | - | - | - | - | - | - | - | ✔
glGetTextureParameteriv | - | - | - | - | - | - | - | - | - | - | - | ✔

SEE ALSO

glTexParameter(), glTextureParameter, glTexStorage1D(), glTexStorage2D(), glTexStorage3D(), glTextureStorage1D, glTextureStorage2D, glTextureStorage3D, glTextureView()

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/.

COPYRIGHT
Copyright © 1991-2006 Silicon Graphics, Inc.
Copyright © 2010-2014 Khronos Group