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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 │ 2.0 │ 2.1 │ 3.0 │ 3.1 │ 3.2 │ 3.3 │ 4.0 │ 4.1 │ 4.2 │ 4.3 │ 4.4 │ 4.5 │
│/ │ │ │ │ │ │ │ │ │ │ │ │ │
│Feature │ │ │ │ │ │ │ │ │ │ │ │ │
│Name │ │ │ │ │ │ │ │ │ │ │ │ │
├──────────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│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
[FIXME: source] 07/22/2015 GLGETTEXPARAMETER(3G)