glGet, glGetBooleanv, glGetDoublev, glGetFloatv, glGetIntegerv
- return the value or values of a selected parameter
void glGetBooleanv(
GLenum pname,
GLboolean *params ); void glGetDoublev(
GLenum pname,
GLdouble *params ); void glGetFloatv(
GLenum pname,
GLfloat *params ); void glGetIntegerv(
GLenum pname,
GLint *params );
Specifies the parameter value to be returned. The symbolic
constants in the list below are accepted. Returns the
value or values of the specified parameter.
These four commands return values for simple state variables
in GL. pname is a symbolic constant indicating the
state variable to be returned, and params is a pointer to
an array of the indicated type in which to place the
returned data.
Type conversion is performed if params has a different
type than the state variable value being requested. If
glGetBooleanv() is called, a floating-point (or integer)
value is converted to GL_FALSE if and only if it is 0.0
(or 0). Otherwise, it is converted to GL_TRUE. If glGetIntegerv()
is called, boolean values are returned as
GL_TRUE or GL_FALSE, and most floating-point values are
rounded to the nearest integer value. Floating-point colors
and normals, however, are returned with a linear mapping
that maps 1.0 to the most positive representable
integer value, and -1.0 to the most negative representable
integer value. If glGetFloatv() or glGetDoublev() is
called, boolean values are returned as GL_TRUE or
GL_FALSE, and integer values are converted to floatingpoint
values.
The following symbolic constants are accepted by pname:
params returns one value, the number of alpha bitplanes in
the accumulation buffer. params returns one value, the
number of blue bitplanes in the accumulation buffer.
params returns four values: the red, green, blue, and
alpha values used to clear the accumulation buffer. Integer
values, if requested, are linearly mapped from the
internal floating-point representation such that 1.0
returns the most positive representable integer value, and
-1.0 returns the most negative representable integer
value. The initial value is (0, 0, 0, 0). See glClearAccum().
params returns one value, the number of green bitplanes
in the accumulation buffer. params returns one
value, the number of red bitplanes in the accumulation
buffer. params returns a single value indicating the
active multitexture unit. The initial value is GL_TEXTURE0_ARB.
See glActiveTextureARB(). params returns two
values, the smallest and largest supported sizes for
aliased points. params returns two values, the smallest
and largest supported widths for aliased lines. params
returns one value, the alpha bias factor used during pixel
transfers. The initial value is 0. See glPixelTransfer().
params returns one value, the number of alpha bitplanes in
each color buffer. params returns one value, the alpha
scale factor used during pixel transfers. The initial
value is 1. See glPixelTransfer(). params returns a single
boolean value indicating whether alpha testing of
fragments is enabled. The initial value is GL_FALSE. See
glAlphaFunc(). params returns one value, the symbolic
name of the alpha test function. The initial value is
GL_ALWAYS. See glAlphaFunc(). params returns one value,
the reference value for the alpha test. The initial value
is 0. See glAlphaFunc(). An integer value, if requested,
is linearly mapped from the internal floating-point representation
such that 1.0 returns the most positive representable
integer value, and -1.0 returns the most negative
representable integer value. params returns one value,
the depth of the attribute stack. If the stack is empty,
0 is returned. The initial value is 0. See glPushAttrib().
params returns a single boolean value indicating whether
2D map evaluation automatically generates surface normals.
The initial value is GL_FALSE. See glMap2(). params
returns one value, the number of auxiliary color buffers.
The initial value is 0. params returns a single boolean
value indicating whether blending is enabled. The initial
value is GL_FALSE. See glBlendFunc(). params returns four
values, the red, green, blue, and alpha values which are
the components of the blend color. See glBlendColor().
params returns one value, the symbolic constant identifying
the destination blend function. The initial value is
GL_ZERO. See glBlendFunc(). params returns one value, a
symbolic constant indicating whether the blend equation is
GL_FUNC_ADD, GL_MIN or GL_MAX. See glBlendEquation().
params returns one value, the symbolic constant identifying
the source blend function. The initial value is
GL_ONE. See glBlendFunc(). params returns one value, the
blue bias factor used during pixel transfers. The initial
value is 0. See glPixelTransfer(). params returns one
value, the number of blue bitplanes in each color buffer.
params returns one value, the blue scale factor used during
pixel transfers. The initial value is 1. See glPixelTransfer().
params returns a single integer value indicating
the current client active multitexture unit. The
initial value is GL_TEXTURE0_ARB. See glClientActiveTextureARB().
params returns one value indicating the depth
of the attribute stack. The initial value is 0. See
glPushClientAttrib(). params returns a single boolean
value indicating whether the specified clipping plane is
enabled. The initial value is GL_FALSE. See glClipPlane().
params returns a single boolean value indicating whether
the color array is enabled. The initial value is GL_FALSE.
See glColorPointer(). params returns one value, the number
of components per color in the color array. The initial
value is 4. See glColorPointer(). params returns one
value, the byte offset between consecutive colors in the
color array. The initial value is 0. See glColorPointer().
params returns one value, the data type of each component
in the color array. The initial value is GL_FLOAT. See
glColorPointer(). params returns four values: the red,
green, blue, and alpha values used to clear the color
buffers. Integer values, if requested, are linearly mapped
from the internal floating-point representation such that
1.0 returns the most positive representable integer value,
and -1.0 returns the most negative representable integer
value. The initial value is (0, 0, 0, 0). See glClearColor().
params returns a single boolean value indicating
whether a fragment's RGBA color values are merged into the
framebuffer using a logical operation. The initial value
is GL_FALSE. See glLogicOp(). params returns a single
boolean value indicating whether one or more material
parameters are tracking the current color. The initial
value is GL_FALSE. See glColorMaterial(). params returns
one value, a symbolic constant indicating which materials
have a parameter that is tracking the current color. The
initial value is GL_FRONT_AND_BACK. See glColorMaterial().
params returns one value, a symbolic constant indicating
which material parameters are tracking the current color.
The initial value is GL_AMBIENT_AND_DIFFUSE. See glColorMaterial().
params returns sixteen values: the color
matrix on the top of the color matrix stack. Initially
this matrix is the identity matrix. See glPushMatrix().
params returns one value, the maximum supported depth of
the projection matrix stack. The value must be at least 2.
See glPushMatrix(). params returns a single boolean value
indicating whether the color table lookup is enabled. See
glColorTable(). params returns four boolean values: the
red, green, blue, and alpha write enables for the color
buffers. The initial value is (GL_TRUE, GL_TRUE, GL_TRUE,
GL_TRUE). See glColorMask(). params returns a single
boolean value indicating whether 1D convolution is
enabled. The initial value is GL_FALSE. See glConvolutionFilter1D().
params returns a single boolean value
indicating whether 2D convolution is enabled. The initial
value is GL_FALSE. See glConvolutionFilter2D(). params
returns a single boolean value indicating whether polygon
culling is enabled. The initial value is GL_FALSE. See
glCullFace(). params returns one value, a symbolic constant
indicating which polygon faces are to be culled. The
initial value is GL_BACK. See glCullFace(). params
returns four values: the red, green, blue, and alpha values
of the current color. Integer values, if requested,
are linearly mapped from the internal floating-point representation
such that 1.0 returns the most positive representable
integer value, and -1.0 returns the most negative
representable integer value. See glColor(). The initial
value is (1, 1, 1, 1). params returns one value, the current
color index. The initial value is 1. See glIndex().
params returns three values: the x, y, and z values of the
current normal. Integer values, if requested, are linearly
mapped from the internal floating-point representation
such that 1.0 returns the most positive representable
integer value, and -1.0 returns the most negative representable
integer value. The initial value is (0, 0, 1).
See glNormal(). params returns four values: the red,
green, blue, and alpha values of the current raster position.
Integer values, if requested, are linearly mapped
from the internal floating-point representation such that
1.0 returns the most positive representable integer value,
and -1.0 returns the most negative representable integer
value. The initial value is (1, 1, 1, 1). See glRasterPos().
params returns one value, the distance from the
eye to the current raster position. The initial value is
0. See glRasterPos(). params returns one value, the color
index of the current raster position. The initial value is
1. See glRasterPos(). params returns four values: the x,
y, z, and w components of the current raster position. x,
y, and z are in window coordinates, and w is in clip coordinates.
The initial value is (0, 0, 0, 1). See glRasterPos().
params returns a single boolean value indicating
whether the current raster position is valid. The initial
value is GL_TRUE. See glRasterPos(). params returns four
values: the s, t, r, and q current raster texture coordinates.
The initial value is (0, 0, 0, 1). See glRasterPos()
and glTexCoord(). params returns four values: the
s, t, r, and q current texture coordinates. The initial
value is (0, 0, 0, 1). See glTexCoord(). params returns
one value, the depth bias factor used during pixel transfers.
The initial value is 0. See glPixelTransfer().
params returns one value, the number of bitplanes in the
depth buffer. params returns one value, the value that is
used to clear the depth buffer. Integer values, if
requested, are linearly mapped from the internal floatingpoint
representation such that 1.0 returns the most positive
representable integer value, and -1.0 returns the
most negative representable integer value. The initial
value is 1. See glClearDepth(). params returns one value,
the symbolic constant that indicates the depth comparison
function. The initial value is GL_LESS. See glDepthFunc().
params returns two values: the near and far mapping
limits for the depth buffer. Integer values, if
requested, are linearly mapped from the internal floatingpoint
representation such that 1.0 returns the most positive
representable integer value, and -1.0 returns the
most negative representable integer value. The initial
value is (0, 1). See glDepthRange(). params returns one
value, the depth scale factor used during pixel transfers.
The initial value is 1. See glPixelTransfer(). params
returns a single boolean value indicating whether depth
testing of fragments is enabled. The initial value is
GL_FALSE. See glDepthFunc() and glDepthRange(). params
returns a single boolean value indicating if the depth
buffer is enabled for writing. The initial value is
GL_TRUE. See glDepthMask(). params returns a single
boolean value indicating whether dithering of fragment
colors and indices is enabled. The initial value is
GL_TRUE. params returns a single boolean value indicating
whether double buffering is supported. params returns one
value, a symbolic constant indicating which buffers are
being drawn to. See glDrawBuffer(). The initial value is
GL_BACK if there are back buffers, otherwise it is
GL_FRONT. params returns a single boolean value indicating
whether the current edge option is GL_TRUE or
GL_FALSE. The initial value is GL_TRUE. See glEdgeFlag().
params returns a single boolean value indicating whether
the edge option array is enabled. The initial value is
GL_FALSE. See glEdgeFlagPointer(). params returns one
value, the byte offset between consecutive edge options in
the edge option array. The initial value is 0. See glEdgeFlagPointer().
params returns one value, the size of the
feedback buffer. See glFeedbackBuffer(). params returns
one value, the type of the feedback buffer. See glFeedbackBuffer().
params returns a single boolean value indicating
whether fogging is enabled. The initial value is
GL_FALSE. See glFog(). params returns four values: the
red, green, blue, and alpha components of the fog color.
Integer values, if requested, are linearly mapped from the
internal floating-point representation such that 1.0
returns the most positive representable integer value, and
-1.0 returns the most negative representable integer
value. The initial value is (0, 0, 0, 0). See glFog().
params returns one value, the fog density parameter. The
initial value is 1. See glFog(). params returns one
value, the end factor for the linear fog equation. The
initial value is 1. See glFog(). params returns one
value, a symbolic constant indicating the mode of the fog
hint. The initial value is GL_DONT_CARE. See glHint().
params returns one value, the fog color index. The initial
value is 0. See glFog(). params returns one value, a symbolic
constant indicating which fog equation is selected.
The initial value is GL_EXP. See glFog(). params returns
one value, the start factor for the linear fog equation.
The initial value is 0. See glFog(). params returns one
value, a symbolic constant indicating whether clockwise or
counterclockwise polygon winding is treated as front-facing.
The initial value is GL_CCW. See glFrontFace().
params returns one value, the green bias factor used during
pixel transfers. The initial value is 0. params
returns one value, the number of green bitplanes in each
color buffer. params returns one value, the green scale
factor used during pixel transfers. The initial value is
1. See glPixelTransfer(). params returns a single boolean
value indicating whether histogram is enabled. The initial
value is GL_FALSE. See glHistogram(). params returns a
single boolean value indicating whether the color index
array is enabled. The initial value is GL_FALSE. See
glIndexPointer(). params returns one value, the byte offset
between consecutive color indexes in the color index
array. The initial value is 0. See glIndexPointer().
params returns one value, the data type of indexes in the
color index array. The initial value is GL_FLOAT. See
glIndexPointer(). params returns one value, the number of
bitplanes in each color index buffer. params returns one
value, the color index used to clear the color index
buffers. The initial value is 0. See glClearIndex().
params returns a single boolean value indicating whether a
fragment's index values are merged into the framebuffer
using a logical operation. The initial value is GL_FALSE.
See glLogicOp(). params returns a single boolean value
indicating whether the GL is in color index mode (GL_TRUE)
or RGBA mode (GL_FALSE). params returns one value, the
offset added to color and stencil indices during pixel
transfers. The initial value is 0. See glPixelTransfer().
params returns one value, the amount that color and stencil
indices are shifted during pixel transfers. The initial
value is 0. See glPixelTransfer(). params returns
one value, a mask indicating which bitplanes of each color
index buffer can be written. The initial value is all 1's.
See glIndexMask(). params returns a single boolean value
indicating whether the specified light is enabled. The
initial value is GL_FALSE. See glLight() and glLightModel().
params returns a single boolean value indicating
whether lighting is enabled. The initial value is
GL_FALSE. See glLightModel(). params returns four values:
the red, green, blue, and alpha components of the ambient
intensity of the entire scene. Integer values, if
requested, are linearly mapped from the internal floatingpoint
representation such that 1.0 returns the most positive
representable integer value, and -1.0 returns the
most negative representable integer value. The initial
value is (0.2, 0.2, 0.2, 1.0). See glLightModel(). params
returns single enumerated value indicating whether specular
reflection calculations are separated from normal
lighting computations. The initial value is GL_SINGLE_COLOR.
params returns a single boolean value indicating
whether specular reflection calculations treat the
viewer as being local to the scene. The initial value is
GL_FALSE. See glLightModel(). params returns a single
boolean value indicating whether separate materials are
used to compute lighting for front- and back-facing polygons.
The initial value is GL_FALSE. See glLightModel().
params returns a single boolean value indicating whether
antialiasing of lines is enabled. The initial value is
GL_FALSE. See glLineWidth(). params returns one value, a
symbolic constant indicating the mode of the line
antialiasing hint. The initial value is GL_DONT_CARE. See
glHint(). params returns a single boolean value indicating
whether stippling of lines is enabled. The initial
value is GL_FALSE. See glLineStipple(). params returns
one value, the 16-bit line stipple pattern. The initial
value is all 1's. See glLineStipple(). params returns one
value, the line stipple repeat factor. The initial value
is 1. See glLineStipple(). params returns one value, the
line width as specified with glLineWidth(). The initial
value is 1. params returns one value, the width difference
between adjacent supported widths for antialiased
lines. See glLineWidth(). params returns two values: the
smallest and largest supported widths for antialiased
lines. See glLineWidth(). params returns one value, the
base offset added to all names in arrays presented to
glCallLists(). The initial value is 0. See glListBase().
params returns one value, the name of the display list
currently under construction. 0 is returned if no display
list is currently under construction. The initial value
is 0. See glNewList(). params returns one value, a symbolic
constant indicating the construction mode of the
display list currently under construction. The initial
value is 0. See glNewList(). params returns one value, a
symbolic constant indicating the selected logic operation
mode. The initial value is GL_COPY. See glLogicOp().
params returns a single boolean value indicating whether
1D evaluation generates colors. The initial value is
GL_FALSE. See glMap1(). params returns two values: the
endpoints of the 1D map's grid domain. The initial value
is (0, 1). See glMapGrid(). params returns one value, the
number of partitions in the 1D map's grid domain. The initial
value is 1. See glMapGrid(). params returns a single
boolean value indicating whether 1D evaluation generates
color indices. The initial value is GL_FALSE. See
glMap1(). params returns a single boolean value indicating
whether 1D evaluation generates normals. The initial
value is GL_FALSE. See glMap1(). params returns a single
boolean value indicating whether 1D evaluation generates
1D texture coordinates. The initial value is GL_FALSE. See
glMap1(). params returns a single boolean value indicating
whether 1D evaluation generates 2D texture coordinates.
The initial value is GL_FALSE. See glMap1().
params returns a single boolean value indicating whether
1D evaluation generates 3D texture coordinates. The initial
value is GL_FALSE. See glMap1(). params returns a
single boolean value indicating whether 1D evaluation generates
4D texture coordinates. The initial value is
GL_FALSE. See glMap1(). params returns a single boolean
value indicating whether 1D evaluation generates 3D vertex
coordinates. The initial value is GL_FALSE. See glMap1().
params returns a single boolean value indicating whether
1D evaluation generates 4D vertex coordinates. The initial
value is GL_FALSE. See glMap1(). params returns a single
boolean value indicating whether 2D evaluation generates
colors. The initial value is GL_FALSE. See glMap2().
params returns four values: the endpoints of the 2D map's
i and j grid domains. The initial value is (0,1; 0,1). See
glMapGrid(). params returns two values: the number of
partitions in the 2D map's i and j grid domains. The initial
value is (1,1). See glMapGrid(). params returns a
single boolean value indicating whether 2D evaluation generates
color indices. The initial value is GL_FALSE. See
glMap2(). params returns a single boolean value indicating
whether 2D evaluation generates normals. The initial
value is GL_FALSE. See glMap2(). params returns a single
boolean value indicating whether 2D evaluation generates
1D texture coordinates. The initial value is GL_FALSE. See
glMap2(). params returns a single boolean value indicating
whether 2D evaluation generates 2D texture coordinates.
The initial value is GL_FALSE. See glMap2().
params returns a single boolean value indicating whether
2D evaluation generates 3D texture coordinates. The initial
value is GL_FALSE. See glMap2(). params returns a
single boolean value indicating whether 2D evaluation generates
4D texture coordinates. The initial value is
GL_FALSE. See glMap2(). params returns a single boolean
value indicating whether 2D evaluation generates 3D vertex
coordinates. The initial value is GL_FALSE. See glMap2().
params returns a single boolean value indicating whether
2D evaluation generates 4D vertex coordinates. The initial
value is GL_FALSE. See glMap2(). params returns a single
boolean value indicating if colors and color indices are
to be replaced by table lookup during pixel transfers. The
initial value is GL_FALSE. See glPixelTransfer(). params
returns a single boolean value indicating if stencil
indices are to be replaced by table lookup during pixel
transfers. The initial value is GL_FALSE. See glPixelTransfer().
params returns one value, a symbolic constant
indicating which matrix stack is currently the target of
all matrix operations. The initial value is GL_MODELVIEW.
See glMatrixMode(). params returns one value, a rough
estimate of the largest 3D texture that the GL can handle.
If the GL version is 1.2 or greater, use GL_PROXY_TEXTURE_3D
to determine if a texture is too large. See glTexImage3D().
params returns one value indicating the maximum
supported depth of the client attribute stack. See
glPushClientAttrib(). params returns one value, the maximum
supported depth of the attribute stack. The value must
be at least 16. See glPushAttrib(). params returns one
value, the maximum number of application-defined clipping
planes. The value must be at least 6. See glClipPlane().
params returns one value, the maximum supported depth of
the color matrix stack. The value must be at least 2. See
glPushMatrix(). params returns one value, the recommended
maximum number of vertex array indices. See
glDrawRangeElements(). params returns one value, the recommended
maximum number of vertex array vertices. See
glDrawRangeElements(). params returns one value, the maximum
equation order supported by 1D and 2D evaluators. The
value must be at least 8. See glMap1() and glMap2().
params returns one value, the maximum number of lights.
The value must be at least 8. See glLight(). params
returns one value, the maximum recursion depth allowed
during display-list traversal. The value must be at least
64. See glCallList(). params returns one value, the maximum
supported depth of the modelview matrix stack. The
value must be at least 32. See glPushMatrix(). params
returns one value, the maximum supported depth of the
selection name stack. The value must be at least 64. See
glPushName(). params returns one value, the maximum supported
size of a glPixelMap() lookup table. The value must
be at least 32. See glPixelMap(). params returns one
value, the maximum supported depth of the projection
matrix stack. The value must be at least 2. See glPushMatrix().
params returns one value. The value gives a rough
estimate of the largest texture that the GL can handle. If
the GL version is 1.1 or greater, use GL_PROXY_TEXTURE_1D
or GL_PROXY_TEXTURE_2D to determine if a texture is too
large. See glTexImage1D() and glTexImage2D(). params
returns one value, the maximum supported depth of the
texture matrix stack. The value must be at least 2. See
glPushMatrix(). params returns a single value indicating
the number of texture units supported. The value must be
at least 1. See glActiveTextureARB(). params returns two
values: the maximum supported width and height of the
viewport. These must be at least as large as the visible
dimensions of the display being rendered to. See glViewport().
params returns a single boolean value indicating
whether pixel minmax values are computed. The initial
value is GL_FALSE. See glMinmax(). params returns sixteen
values: the modelview matrix on the top of the modelview
matrix stack. Initially this matrix is the identity
matrix. See glPushMatrix(). params returns one value,
the number of matrices on the modelview matrix stack. The
initial value is 1. See glPushMatrix(). params returns
one value, the number of names on the selection name
stack. The initial value is 0. See glPushName(). params
returns a single boolean value, indicating whether the
normal array is enabled. The initial value is GL_FALSE.
See glNormalPointer(). params returns one value, the byte
offset between consecutive normals in the normal array.
The initial value is 0. See glNormalPointer(). params
returns one value, the data type of each coordinate in the
normal array. The initial value is GL_FLOAT. See glNormalPointer().
params returns a single boolean value indicating
whether normals are automatically scaled to unit
length after they have been transformed to eye coordinates.
The initial value is GL_FALSE. See glNormal().
params returns one value, the byte alignment used for
writing pixel data to memory. The initial value is 4. See
glPixelStore(). params returns one value, the image
height used for writing pixel data to memory. The initial
value is 0. See glPixelStore(). params returns a single
boolean value indicating whether single-bit pixels being
written to memory are written first to the least significant
bit of each unsigned byte. The initial value is
GL_FALSE. See glPixelStore(). params returns one value,
the row length used for writing pixel data to memory. The
initial value is 0. See glPixelStore(). params returns
one value, the number of pixel images skipped before the
first pixel is written into memory. The initial value is
0. See glPixelStore(). params returns one value, the number
of pixel locations skipped before the first pixel is
written into memory. The initial value is 0. See glPixelStore().
params returns one value, the number of rows of
pixel locations skipped before the first pixel is written
into memory. The initial value is 0. See glPixelStore().
params returns a single boolean value indicating whether
the bytes of two-byte and four-byte pixel indices and components
are swapped before being written to memory. The
initial value is GL_FALSE. See glPixelStore(). params
returns one value, a symbolic constant indicating the mode
of the perspective correction hint. The initial value is
GL_DONT_CARE. See glHint(). params returns one value, the
size of the alpha-to-alpha pixel translation table. The
initial value is 1. See glPixelMap(). params returns one
value, the size of the blue-to-blue pixel translation
table. The initial value is 1. See glPixelMap(). params
returns one value, the size of the green-to-green pixel
translation table. The initial value is 1. See glPixelMap().
params returns one value, the size of the indexto-alpha
pixel translation table. The initial value is 1.
See glPixelMap(). params returns one value, the size of
the index-to-blue pixel translation table. The initial
value is 1. See glPixelMap(). params returns one value,
the size of the index-to-green pixel translation table.
The initial value is 1. See glPixelMap(). params returns
one value, the size of the index-to-index pixel translation
table. The initial value is 1. See glPixelMap().
params returns one value, the size of the index-to-red
pixel translation table. The initial value is 1. See
glPixelMap(). params returns one value, the size of the
red-to-red pixel translation table. The initial value is
1. See glPixelMap(). params returns one value, the size
of the stencil-to-stencil pixel translation table. The
initial value is 1. See glPixelMap(). params returns one
value, the point size as specified by glPointSize(). The
initial value is 1. params returns one value, the size
difference between adjacent supported sizes for
antialiased points. See glPointSize(). params returns two
values: the smallest and largest supported sizes for
antialiased points. The smallest size must be at most 1,
and the largest size must be at least 1. See glPointSize().
params returns a single boolean value indicating
whether antialiasing of points is enabled. The initial
value is GL_FALSE. See glPointSize(). params returns one
value, a symbolic constant indicating the mode of the
point antialiasing hint. The initial value is
GL_DONT_CARE. See glHint(). params returns two values:
symbolic constants indicating whether front-facing and
back-facing polygons are rasterized as points, lines, or
filled polygons. The initial value is GL_FILL. See glPolygonMode().
params returns one value, the scaling factor
used to determine the variable offset that is added to the
depth value of each fragment generated when a polygon is
rasterized. The initial value is 0. See glPolygonOffset().
params returns one value. This value is multiplied by an
implementation-specific value and then added to the depth
value of each fragment generated when a polygon is rasterized.
The initial value is 0. See glPolygonOffset().
params returns a single boolean value indicating whether
polygon offset is enabled for polygons in fill mode. The
initial value is GL_FALSE. See glPolygonOffset(). params
returns a single boolean value indicating whether polygon
offset is enabled for polygons in line mode. The initial
value is GL_FALSE. See glPolygonOffset(). params returns
a single boolean value indicating whether polygon offset
is enabled for polygons in point mode. The initial value
is GL_FALSE. See glPolygonOffset(). params returns a single
boolean value indicating whether antialiasing of polygons
is enabled. The initial value is GL_FALSE. See
glPolygonMode(). params returns one value, a symbolic
constant indicating the mode of the polygon antialiasing
hint. The initial value is GL_DONT_CARE. See glHint().
params returns a single boolean value indicating whether
polygon stippling is enabled. The initial value is
GL_FALSE. See glPolygonStipple(). params returns a single
boolean value indicating whether post color matrix transformation
lookup is enabled. The initial value is
GL_FALSE. See glColorTable(). params returns one value,
the red bias factor applied to RGBA fragments after color
matrix transformations. The initial value is 0. See glPixelTransfer().
params returns one value, the green bias
factor applied to RGBA fragments after color matrix transformations.
The initial value is 0. See glPixelTransfer()
params returns one value, the blue bias factor applied to
RGBA fragments after color matrix transformations. The
initial value is 0. See glPixelTransfer(). params returns
one value, the alpha bias factor applied to RGBA fragments
after color matrix transformations. The initial value is
0. See glPixelTransfer(). params returns one value, the
red scale factor applied to RGBA fragments after color
matrix transformations. The initial value is 1. See glPixelTransfer().
params returns one value, the green scale
factor applied to RGBA fragments after color matrix transformations.
The initial value is 1. See glPixelTransfer().
params returns one value, the blue scale factor applied to
RGBA fragments after color matrix transformations. The
initial value is 1. See glPixelTransfer(). params returns
one value, the alpha scale factor applied to RGBA fragments
after color matrix transformations. The initial
value is 1. See glPixelTransfer(). params returns a single
boolean value indicating whether post convolution
lookup is enabled. The initial value is GL_FALSE. See
glColorTable(). params returns one value, the red bias
factor applied to RGBA fragments after convolution. The
initial value is 0. See glPixelTransfer(). params returns
one value, the green bias factor applied to RGBA fragments
after convolution. The initial value is 0. See glPixelTransfer().
params returns one value, the blue bias factor
applied to RGBA fragments after convolution. The initial
value is 0. See glPixelTransfer(). params returns
one value, the alpha bias factor applied to RGBA fragments
after convolution. The initial value is 0. See glPixelTransfer().
params returns one value, the red scale factor
applied to RGBA fragments after convolution. The initial
value is 1. See glPixelTransfer(). params returns
one value, the green scale factor applied to RGBA fragments
after convolution. The initial value is 1. See
glPixelTransfer(). params returns one value, the blue
scale factor applied to RGBA fragments after convolution.
The initial value is 1. See glPixelTransfer(). params
returns one value, the alpha scale factor applied to RGBA
fragments after convolution. The initial value is 1. See
glPixelTransfer(). params returns sixteen values: the
projection matrix on the top of the projection matrix
stack. Initially this matrix is the identity matrix. See
glPushMatrix(). params returns one value, the number of
matrices on the projection matrix stack. The initial value
is 1. See glPushMatrix(). params returns one value, a
symbolic constant indicating which color buffer is
selected for reading. The initial value is GL_BACK if
there is a back buffer, otherwise it is GL_FRONT. See
glReadPixels() and glAccum(). params returns one value,
the red bias factor used during pixel transfers. The initial
value is 0. params returns one value, the number of
red bitplanes in each color buffer. params returns one
value, the red scale factor used during pixel transfers.
The initial value is 1. See glPixelTransfer(). params
returns one value, a symbolic constant indicating whether
the GL is in render, select, or feedback mode. The initial
value is GL_RENDER. See glRenderMode(). params returns
single boolean value indicating whether normal rescaling
is enabled. See glEnable(). params returns a single
boolean value indicating whether the GL is in RGBA mode
(true) or color index mode (false). See glColor(). params
returns four values: the x and y window coordinates of the
scissor box, followed by its width and height. Initially
the x and y window coordinates are both 0 and the width
and height are set to the size of the window. See glScissor().
params returns a single boolean value indicating
whether scissoring is enabled. The initial value is
GL_FALSE. See glScissor(). params return one value, the
size of the selection buffer. See glSelectBuffer().
params returns a single boolean value indicating whether
2D separable convolution is enabled. The initial value is
GL_FALSE. See glSeparableFilter2D(). params returns one
value, a symbolic constant indicating whether the shading
mode is flat or smooth. The initial value is GL_SMOOTH.
See glShadeModel(). params returns two values, the smallest
and largest supported widths for antialiased lines.
See glLineWidth(). params returns one value, the granularity
of widths for antialiased lines. See glLineWidth().
params returns two values, the smallest and largest supported
widths for antialiased points. See glPointSize().
params returns one value, the granularity of sizes for
antialiased points. See glPointSize(). params returns one
value, the number of bitplanes in the stencil buffer.
params returns one value, the index to which the stencil
bitplanes are cleared. The initial value is 0. See
glClearStencil(). params returns one value, a symbolic
constant indicating what action is taken when the stencil
test fails. The initial value is GL_KEEP. See glStencilOp().
params returns one value, a symbolic constant
indicating what function is used to compare the stencil
reference value with the stencil buffer value. The initial
value is GL_ALWAYS. See glStencilFunc(). params returns
one value, a symbolic constant indicating what action is
taken when the stencil test passes, but the depth test
fails. The initial value is GL_KEEP. See glStencilOp().
params returns one value, a symbolic constant indicating
what action is taken when the stencil test passes and the
depth test passes. The initial value is GL_KEEP. See glStencilOp().
params returns one value, the reference value
that is compared with the contents of the stencil buffer.
The initial value is 0. See glStencilFunc(). params
returns a single boolean value indicating whether stencil
testing of fragments is enabled. The initial value is
GL_FALSE. See glStencilFunc() and glStencilOp(). params
returns one value, the mask that is used to mask both the
stencil reference value and the stencil buffer value
before they are compared. The initial value is all 1's.
See glStencilFunc(). params returns one value, the mask
that controls writing of the stencil bitplanes. The initial
value is all 1's. See glStencilMask(). params
returns a single boolean value indicating whether stereo
buffers (left and right) are supported. params returns
one value, an estimate of the number of bits of subpixel
resolution that are used to position rasterized geometry
in window coordinates. The initial value is 4. params
returns a single boolean value indicating whether 1D texture
mapping is enabled. The initial value is GL_FALSE.
See glTexImage1D(). params returns a single value, the
name of the texture currently bound to the target GL_TEXTURE_1D.
The initial value is 0. See glBindTexture().
params returns a single boolean value indicating whether
2D texture mapping is enabled. The initial value is
GL_FALSE. See glTexImage2D(). params returns a single
value, the name of the texture currently bound to the target
GL_TEXTURE_2D. The initial value is 0. See glBindTexture().
params returns a single boolean value indicating
whether 3D texture mapping is enabled. The initial value
is GL_FALSE. See glTexImage3D(). params returns a single
value, the name of the texture currently bound to the target
GL_TEXTURE_3D. The initial value is 0. See glBindTexture().
params returns a single boolean value indicating
whether the texture coordinate array is enabled. The initial
value is GL_FALSE. See glTexCoordPointer(). params
returns one value, the number of coordinates per element
in the texture coordinate array. The initial value is 4.
See glTexCoordPointer(). params returns one value, the
byte offset between consecutive elements in the texture
coordinate array. The initial value is 0. See glTexCoordPointer().
params returns one value, the data type of the
coordinates in the texture coordinate array. The initial
value is GL_FLOAT. See glTexCoordPointer(). params
returns a single boolean value indicating whether automatic
generation of the q texture coordinate is enabled.
The initial value is GL_FALSE. See glTexGen(). params
returns a single boolean value indicating whether automatic
generation of the r texture coordinate is enabled.
The initial value is GL_FALSE. See glTexGen(). params
returns a single boolean value indicating whether automatic
generation of the S texture coordinate is enabled.
The initial value is GL_FALSE. See glTexGen(). params
returns a single boolean value indicating whether automatic
generation of the T texture coordinate is enabled.
The initial value is GL_FALSE. See glTexGen(). params
returns sixteen values: the texture matrix on the top of
the texture matrix stack. Initially this matrix is the
identity matrix. See glPushMatrix(). params returns one
value, the number of matrices on the texture matrix stack.
The initial value is 1. See glPushMatrix(). params
returns one value, the byte alignment used for reading
pixel data from memory. The initial value is 4. See glPixelStore().
params returns one value, the image height
used for reading pixel data from memory. The initial is
0. See glPixelStore(). params returns a single boolean
value indicating whether single-bit pixels being read from
memory are read first from the least significant bit of
each unsigned byte. The initial value is GL_FALSE. See
glPixelStore(). params returns one value, the row length
used for reading pixel data from memory. The initial value
is 0. See glPixelStore(). params returns one value, the
number of pixel images skipped before the first pixel is
read from memory. The initial value is 0. See glPixelStore().
params returns one value, the number of pixel
locations skipped before the first pixel is read from memory.
The initial value is 0. See glPixelStore(). params
returns one value, the number of rows of pixel locations
skipped before the first pixel is read from memory. The
initial value is 0. See glPixelStore(). params returns a
single boolean value indicating whether the bytes of twobyte
and four-byte pixel indices and components are
swapped after being read from memory. The initial value is
GL_FALSE. See glPixelStore(). params returns a single
boolean value indicating whether the vertex array is
enabled. The initial value is GL_FALSE. See glVertexPointer().
params returns one value, the number of coordinates
per vertex in the vertex array. The initial value
is 4. See glVertexPointer(). params returns one value,
the byte offset between consecutive vertexes in the vertex
array. The initial value is 0. See glVertexPointer().
params returns one value, the data type of each coordinate
in the vertex array. The initial value is GL_FLOAT. See
glVertexPointer(). params returns four values: the x and
y window coordinates of the viewport, followed by its
width and height. Initially the x and y window coordinates
are both set to 0, and the width and height are set to the
width and height of the window into which the GL will do
its rendering. See glViewport(). params returns one
value, the x pixel zoom factor. The initial value is 1.
See glPixelZoom(). params returns one value, the y pixel
zoom factor. The initial value is 1. See glPixelZoom().
Many of the boolean parameters can also be queried more
easily using glIsEnabled().
GL_COLOR_LOGIC_OP, GL_COLOR_ARRAY, GL_COLOR_ARRAY_SIZE,
GL_COLOR_ARRAY_STRIDE, GL_COLOR_ARRAY_TYPE,
GL_EDGE_FLAG_ARRAY, GL_EDGE_FLAG_ARRAY_STRIDE,
GL_INDEX_ARRAY, GL_INDEX_ARRAY_STRIDE,
GL_INDEX_ARRAY_TYPE, GL_INDEX_LOGIC_OP, GL_NORMAL_ARRAY,
GL_NORMAL_ARRAY_STRIDE, GL_NORMAL_ARRAY_TYPE, GL_POLYGON_OFFSET_UNITS,
GL_POLYGON_OFFSET_FACTOR, GL_POLYGON_OFFSET_FILL,
GL_POLYGON_OFFSET_LINE, GL_POLYGON_OFFSET_POINT,
GL_TEXTURE_COORD_ARRAY, GL_TEXTURE_COORD_ARRAY_SIZE,
GL_TEXTURE_COORD_ARRAY_STRIDE,
GL_TEXTURE_COORD_ARRAY_TYPE, GL_VERTEX_ARRAY, GL_VERTEX_ARRAY_SIZE,
GL_VERTEX_ARRAY_STRIDE, and GL_VERTEX_ARRAY_TYPE
are available only if the GL version is 1.1
or greater.
GL_ALIASED_POINT_SIZE_RANGE, GL_ALIASED_POINT_SIZE_GRANULARITY,
GL_FEEDBACK_BUFFER_SIZE, GL_FEEDBACK_BUFFER_TYPE,
GL_LIGHT_MODEL_AMBIENT, GL_LIGHT_MODEL_COLOR_CONTROL,
GL_MAX_3D_TEXTURE_SIZE, GL_MAX_ELEMENTS_INDICES,
GL_MAX_ELEMENTS_VERTICES, GL_PACK_IMAGE_HEIGHT,
GL_PACK_SKIP_IMAGES, GL_RESCALE_NORMAL, GL_SELECTION_BUFFER_SIZE,
GL_SMOOTH_LINE_WIDTH_GRANULARITY,
GL_SMOOTH_LINE_WIDTH_RANGE, GL_SMOOTH_POINT_SIZE_GRANULARITY,
GL_SMOOTH_POINT_SIZE_RANGE, GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D,
GL_UNPACK_IMAGE_HEIGHT, and
GL_UNPACK_SKIP_IMAGES are available only if the GL version
is 1.2 or greater.
GL_LINE_WIDTH_GRANULARITY was deprecated in GL version
1.2. Its functionality was replaced by
GL_SMOOTH_LINE_WIDTH_GRANULARITY.
GL_LINE_WIDTH_RANGE was deprecated in GL version 1.2. Its
functionality was replaced by GL_SMOOTH_LINE_WIDTH_RANGE.
GL_POINT_SIZE_GRANULARITY was deprecated in GL version
1.2. Its functionality was replaced by
GL_SMOOTH_POINT_SIZE_GRANULARITY.
GL_POINT_SIZE_RANGE was deprecated in GL version 1.2. Its
functionality was replaced by GL_SMOOTH_POINT_SIZE_RANGE.
GL_BLEND_COLOR, GL_BLEND_EQUATION, GL_COLOR_MATRIX,
GL_COLOR_MATRIX_STACK_DEPTH, GL_COLOR_TABLE, GL_CONVOLUTION_1D,
GL_CONVOLUTION_2D, GL_HISTOGRAM,
GL_MAX_COLOR_MATRIX_STACK_DEPTH, GL_MINMAX,
GL_POST_COLOR_MATRIX_COLOR_TABLE,
GL_POST_COLOR_MATRIX_RED_BIAS,
GL_POST_COLOR_MATRIX_GREEN_BIAS,
GL_POST_COLOR_MATRIX_BLUE_BIAS,
GL_POST_COLOR_MATRIX_ALPHA_BIAS,
GL_POST_COLOR_MATRIX_RED_SCALE,
GL_POST_COLOR_MATRIX_GREEN_SCALE,
GL_POST_COLOR_MATRIX_BLUE_SCALE,
GL_POST_COLOR_MATRIX_ALPHA_SCALE, GL_POST_CONVOLUTION_COLOR_TABLE,
GL_POST_CONVOLUTION_RED_BIAS,
GL_POST_CONVOLUTION_GREEN_BIAS, GL_POST_CONVOLUTION_BLUE_BIAS,
GL_POST_CONVOLUTION_ALPHA_BIAS,
GL_POST_CONVOLUTION_RED_SCALE, GL_POST_CONVOLUTION_GREEN_SCALE,
GL_POST_CONVOLUTION_BLUE_SCALE,
GL_POST_CONVOLUTION_ALPHA_SCALE, and GL_SEPARABLE_2D are
available only if GL_ARB_imaging is returned from glGet()
when called with the argument GL_EXTENSIONS.
GL_ACTIVE_TEXTURE_ARB, GL_CLIENT_ACTIVE_TEXTURE_ARB, and
GL_MAX_TEXTURE_UNITS_ARB are available only if GL_ARB_multitexture
is returned from glGet() when called with the
argument GL_EXTENSIONS.
When the GL_ARB_multitexture extension is supported, the
following parameters return the associated value for the
active texture unit: GL_CURRENT_RASTER_TEXTURE_COORDS,
GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D, GL_TEXTURE_2D,
GL_TEXTURE_BINDING_2D, GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D,
GL_TEXTURE_GEN_S, GL_TEXTURE_GEN_T, GL_TEXTURE_GEN_R,
GL_TEXTURE_GEN_Q, GL_TEXTURE_MATRIX, and
GL_TEXTURE_STACK_DEPTH. Likewise, the following parameters
return the associated value for the active client texture
unit: GL_TEXTURE_COORD_ARRAY, GL_TEXTURE_COORD_ARRAY_SIZE,
GL_TEXTURE_COORD_ARRAY_STRIDE, GL_TEXTURE_COORD_ARRAY_TYPE.
GL_INVALID_ENUM is generated if pname is not an accepted
value.
GL_INVALID_OPERATION is generated if glGet() is executed
between the execution of glBegin() and the corresponding
execution of glEnd().
glGetClipPlane(3), glGetColorTable(3), glGetColorTableParameter(3), glGetConvolutionFilter(3), glGetConvolutionParameter(3), glGetError(3), glGetHistogram(3), glGetHistogramParameter(3), glGetLight(3), glGetMap(3), glGetMaterial(3), glGetMinmax(3), glGetMinmaxParameter(3), glGetPixelMap(3), glGetPointerv(3), glGetPolygonStipple(3),
glGetSeparableFilter(3), glGetString(3), glGetTexEnv(3),
glGetTexGen(3), glGetTexImage(3), glGetTexLevelParameter(3), glGetTexParameter(3), glIsEnabled(3)
glGet(3G)
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