glGetTexParameter man page on RedHat
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GLGETTEXPARAMETER(3G) OpenGL Manual 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);
PARAMETERS
target
Specifies the symbolic name of the target texture. GL_TEXTURE_1D,
GL_TEXTURE_2D, GL_TEXTURE_1D_ARRAY, GL_TEXTURE_2D_ARRAY,
GL_TEXTURE_3D, GL_TEXTURE_RECTANGLE, GL_TEXTURE_CUBE_MAP, and
GL_TEXTURE_CUBE_MAP_ARRAY are accepted.
pname
Specifies the symbolic name of a texture parameter.
GL_DEPTH_STENCIL_TEXTURE_MODE, 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_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 returns 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 specify one-, two-, or three-dimensional,
one-dimensional array, two-dimensional array, rectangle, cube-mapped or
cube-mapped 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 accepts the following read-only parameters:
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.
NOTES
If an error is generated, no change is made to the contents of params.
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.
ERRORS
GL_INVALID_ENUM is generated if target or pname is not an accepted
value.
SEE ALSO
glTexParameter(), glTexStorage1D(), glTexStorage2D(), glTexStorage3D(),
glTextureView()
COPYRIGHT
Copyright © 1991-2006 Silicon Graphics, Inc. Copyright © 2010-2012
Khronos Group. This document is licensed under the SGI Free Software B
License. For details, see http://oss.sgi.com/projects/FreeB/.
AUTHORS
opengl.org
opengl.org 03/16/2013 GLGETTEXPARAMETER(3G)
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