GLGET(3G) UNIX Programmer's Manual GLGET(3G)
NAME
glGetBooleanv, glGetDoublev, glGetFloatv, glGetIntegerv -
return the value or values of a selected parameter
C SPECIFICATION
void glGetBooleanv( GLenum pname,
GLboolean *params )
C SPECIFICATION
void glGetDoublev( GLenum pname,
GLdouble *params )
C SPECIFICATION
void glGetFloatv( GLenum pname,
GLfloat *params )
C SPECIFICATION
void glGetIntegerv( GLenum pname,
GLint *params )
PARAMETERS
pname Specifies the parameter value to be returned. The
symbolic constants in the list below are accepted.
params Returns the value or values of the specified parame-
ter.
DESCRIPTION
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
floating-point values.
MirBSD #10-current Printed 2021-12-07 1
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
The following symbolic constants are accepted by pname:
GL_ACCUM_ALPHA_BITS params returns one value, the
number of alpha bitplanes in the
accumulation buffer.
GL_ACCUM_BLUE_BITS params returns one value, the
number of blue bitplanes in the
accumulation buffer.
GL_ACCUM_CLEAR_VALUE 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.
GL_ACCUM_GREEN_BITS params returns one value, the
number of green bitplanes in the
accumulation buffer.
GL_ACCUM_RED_BITS params returns one value, the
number of red bitplanes in the
accumulation buffer.
GL_ACTIVE_TEXTURE_ARB params returns a single value indi-
cating the active multitexture
unit. The initial value is
GL_TEXTURE0_ARB. See
glActiveTextureARB.
GL_ALIASED_POINT_SIZE_RANGE
params returns two values, the
smallest and largest supported
sizes for aliased points.
GL_ALIASED_LINE_WIDTH_RANGE
params returns two values, the
smallest and largest supported
widths for aliased lines.
GL_ALPHA_BIAS params returns one value, the alpha
bias factor used during pixel
transfers. The initial value is 0.
See glPixelTransfer.
MirBSD #10-current Printed 2021-12-07 2
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
GL_ALPHA_BITS params returns one value, the
number of alpha bitplanes in each
color buffer.
GL_ALPHA_SCALE params returns one value, the alpha
scale factor used during pixel
transfers. The initial value is 1.
See glPixelTransfer.
GL_ALPHA_TEST params returns a single boolean
value indicating whether alpha
testing of fragments is enabled.
The initial value is GL_FALSE. See
glAlphaFunc.
GL_ALPHA_TEST_FUNC params returns one value, the sym-
bolic name of the alpha test func-
tion. The initial value is
GL_ALWAYS. See glAlphaFunc.
GL_ALPHA_TEST_REF 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.
GL_ATTRIB_STACK_DEPTH 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.
GL_AUTO_NORMAL params returns a single boolean
value indicating whether 2D map
evaluation automatically generates
surface normals. The initial value
is GL_FALSE. See glMap2.
GL_AUX_BUFFERS params returns one value, the
number of auxiliary color buffers.
The initial value is 0.
GL_BLEND params returns a single boolean
value indicating whether blending
is enabled. The initial value is
GL_FALSE. See glBlendFunc.
MirBSD #10-current Printed 2021-12-07 3
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
GL_BLEND_COLOR params returns four values, the
red, green, blue, and alpha values
which are the components of the
blend color. See glBlendColor.
GL_BLEND_DST params returns one value, the sym-
bolic constant identifying the des-
tination blend function. The ini-
tial value is GL_ZERO. See
glBlendFunc.
GL_BLEND_EQUATION params returns one value, a sym-
bolic constant indicating whether
the blend equation is GL_FUNC_ADD,
GL_MIN or GL_MAX. See
glBlendEquation.
GL_BLEND_SRC params returns one value, the sym-
bolic constant identifying the
source blend function. The initial
value is GL_ONE. See glBlendFunc.
GL_BLUE_BIAS params returns one value, the blue
bias factor used during pixel
transfers. The initial value is 0.
See glPixelTransfer.
GL_BLUE_BITS params returns one value, the
number of blue bitplanes in each
color buffer.
GL_BLUE_SCALE params returns one value, the blue
scale factor used during pixel
transfers. The initial value is 1.
See glPixelTransfer.
GL_CLIENT_ACTIVE_TEXTURE_ARB
params returns a single integer
value indicating the current client
active multitexture unit. The ini-
tial value is GL_TEXTURE0_ARB. See
glClientActiveTextureARB.
GL_CLIENT_ATTRIB_STACK_DEPTH
params returns one value indicating
the depth of the attribute stack.
The initial value is 0. See
glPushClientAttrib.
GL_CLIP_PLANEi params returns a single boolean
value indicating whether the speci-
fied clipping plane is enabled. The
MirBSD #10-current Printed 2021-12-07 4
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
initial value is GL_FALSE. See
glClipPlane.
GL_COLOR_ARRAY params returns a single boolean
value indicating whether the color
array is enabled. The initial value
is GL_FALSE. See glColorPointer.
GL_COLOR_ARRAY_SIZE params returns one value, the
number of components per color in
the color array. The initial value
is 4. See glColorPointer.
GL_COLOR_ARRAY_STRIDE params returns one value, the byte
offset between consecutive colors
in the color array. The initial
value is 0. See glColorPointer.
GL_COLOR_ARRAY_TYPE params returns one value, the data
type of each component in the color
array. The initial value is
GL_FLOAT. See glColorPointer.
GL_COLOR_CLEAR_VALUE 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.
GL_COLOR_LOGIC_OP 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.
GL_COLOR_MATERIAL params returns a single boolean
value indicating whether one or
more material parameters are track-
ing the current color. The initial
value is GL_FALSE. See
glColorMaterial.
GL_COLOR_MATERIAL_FACE params returns one value, a sym-
bolic constant indicating which
MirBSD #10-current Printed 2021-12-07 5
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
materials have a parameter that is
tracking the current color. The
initial value is GL_FRONT_AND_BACK.
See glColorMaterial.
GL_COLOR_MATERIAL_PARAMETER
params returns one value, a sym-
bolic constant indicating which
material parameters are tracking
the current color. The initial
value is GL_AMBIENT_AND_DIFFUSE.
See glColorMaterial.
GL_COLOR_MATRIX params returns sixteen values: the
color matrix on the top of the
color matrix stack. Initially this
matrix is the identity matrix. See
glPushMatrix.
GL_COLOR_MATRIX_STACK_DEPTH
params returns one value, the max-
imum supported depth of the projec-
tion matrix stack. The value must
be at least 2. See glPushMatrix.
GL_COLOR_TABLE params returns a single boolean
value indicating whether the color
table lookup is enabled. See
glColorTable.
GL_COLOR_WRITEMASK 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.
GL_CONVOLUTION_1D params returns a single boolean
value indicating whether 1D convo-
lution is enabled. The initial
value is GL_FALSE. See
glConvolutionFilter1D.
GL_CONVOLUTION_2D params returns a single boolean
value indicating whether 2D convo-
lution is enabled. The initial
value is GL_FALSE. See
glConvolutionFilter2D.
GL_CULL_FACE params returns a single boolean
value indicating whether polygon
culling is enabled. The initial
MirBSD #10-current Printed 2021-12-07 6
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
value is GL_FALSE. See glCullFace.
GL_CULL_FACE_MODE params returns one value, a sym-
bolic constant indicating which
polygon faces are to be culled. The
initial value is GL_BACK. See
glCullFace.
GL_CURRENT_COLOR 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).
GL_CURRENT_INDEX params returns one value, the
current color index. The initial
value is 1. See glIndex.
GL_CURRENT_NORMAL params returns three values: the x,
y, and z values of the current nor-
mal. Integer values, if requested,
are linearly mapped from the inter-
nal 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.
GL_CURRENT_RASTER_COLOR 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.
GL_CURRENT_RASTER_DISTANCE
params returns one value, the
MirBSD #10-current Printed 2021-12-07 7
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
distance from the eye to the
current raster position. The ini-
tial value is 0. See glRasterPos.
GL_CURRENT_RASTER_INDEX params returns one value, the color
index of the current raster posi-
tion. The initial value is 1. See
glRasterPos.
GL_CURRENT_RASTER_POSITION
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.
GL_CURRENT_RASTER_POSITION_VALID
params returns a single boolean
value indicating whether the
current raster position is valid.
The initial value is GL_TRUE. See
glRasterPos.
GL_CURRENT_RASTER_TEXTURE_COORDS
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.
GL_CURRENT_TEXTURE_COORDS
params returns four values: the s,
t, r, and q current texture coordi-
nates. The initial value is (0, 0,
0, 1). See glTexCoord.
GL_DEPTH_BIAS params returns one value, the depth
bias factor used during pixel
transfers. The initial value is 0.
See glPixelTransfer.
GL_DEPTH_BITS params returns one value, the
number of bitplanes in the depth
buffer.
GL_DEPTH_CLEAR_VALUE params returns one value, the value
that is used to clear the depth
buffer. Integer values, if
requested, are linearly mapped from
the internal floating-point
MirBSD #10-current Printed 2021-12-07 8
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
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.
GL_DEPTH_FUNC params returns one value, the sym-
bolic constant that indicates the
depth comparison function. The ini-
tial value is GL_LESS. See
glDepthFunc.
GL_DEPTH_RANGE params returns two values: the near
and far mapping limits for the
depth 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, 1). See
glDepthRange.
GL_DEPTH_SCALE params returns one value, the depth
scale factor used during pixel
transfers. The initial value is 1.
See glPixelTransfer.
GL_DEPTH_TEST params returns a single boolean
value indicating whether depth
testing of fragments is enabled.
The initial value is GL_FALSE. See
glDepthFunc and glDepthRange.
GL_DEPTH_WRITEMASK params returns a single boolean
value indicating if the depth
buffer is enabled for writing. The
initial value is GL_TRUE. See
glDepthMask.
GL_DITHER params returns a single boolean
value indicating whether dithering
of fragment colors and indices is
enabled. The initial value is
GL_TRUE.
GL_DOUBLEBUFFER params returns a single boolean
value indicating whether double
MirBSD #10-current Printed 2021-12-07 9
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
buffering is supported.
GL_DRAW_BUFFER params returns one value, a sym-
bolic 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.
GL_EDGE_FLAG params returns a single boolean
value indicating whether the
current edge flag is GL_TRUE or
GL_FALSE. The initial value is
GL_TRUE. See glEdgeFlag.
GL_EDGE_FLAG_ARRAY params returns a single boolean
value indicating whether the edge
flag array is enabled. The initial
value is GL_FALSE. See
glEdgeFlagPointer.
GL_EDGE_FLAG_ARRAY_STRIDE
params returns one value, the byte
offset between consecutive edge
flags in the edge flag array. The
initial value is 0. See
glEdgeFlagPointer.
GL_FEEDBACK_BUFFER_SIZE params returns one value, the size
of the feedback buffer. See
glFeedbackBuffer.
GL_FEEDBACK_BUFFER_TYPE params returns one value, the type
of the feedback buffer. See
glFeedbackBuffer.
GL_FOG params returns a single boolean
value indicating whether fogging is
enabled. The initial value is
GL_FALSE. See glFog.
GL_FOG_COLOR params returns four values: the
red, green, blue, and alpha com-
ponents 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
MirBSD #10-current Printed 2021-12-07 10
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
glFog.
GL_FOG_DENSITY params returns one value, the fog
density parameter. The initial
value is 1. See glFog.
GL_FOG_END params returns one value, the end
factor for the linear fog equation.
The initial value is 1. See glFog.
GL_FOG_HINT params returns one value, a sym-
bolic constant indicating the mode
of the fog hint. The initial value
is GL_DONT_CARE. See glHint.
GL_FOG_INDEX params returns one value, the fog
color index. The initial value is
0. See glFog.
GL_FOG_MODE params returns one value, a sym-
bolic constant indicating which fog
equation is selected. The initial
value is GL_EXP. See glFog.
GL_FOG_START params returns one value, the start
factor for the linear fog equation.
The initial value is 0. See glFog.
GL_FRONT_FACE params returns one value, a sym-
bolic constant indicating whether
clockwise or counterclockwise
polygon winding is treated as
front-facing. The initial value is
GL_CCW. See glFrontFace.
GL_GREEN_BIAS params returns one value, the green
bias factor used during pixel
transfers. The initial value is 0.
GL_GREEN_BITS params returns one value, the
number of green bitplanes in each
color buffer.
GL_GREEN_SCALE params returns one value, the green
scale factor used during pixel
transfers. The initial value is 1.
See glPixelTransfer.
GL_HISTOGRAM params returns a single boolean
value indicating whether histogram
is enabled. The initial value is
GL_FALSE. See glHistogram.
MirBSD #10-current Printed 2021-12-07 11
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
GL_INDEX_ARRAY params returns a single boolean
value indicating whether the color
index array is enabled. The initial
value is GL_FALSE. See
glIndexPointer.
GL_INDEX_ARRAY_STRIDE params returns one value, the byte
offset between consecutive color
indexes in the color index array.
The initial value is 0. See
glIndexPointer.
GL_INDEX_ARRAY_TYPE params returns one value, the data
type of indexes in the color index
array. The initial value is
GL_FLOAT. See glIndexPointer.
GL_INDEX_BITS params returns one value, the
number of bitplanes in each color
index buffer.
GL_INDEX_CLEAR_VALUE params returns one value, the color
index used to clear the color index
buffers. The initial value is 0.
See glClearIndex.
GL_INDEX_LOGIC_OP params returns a single boolean
value indicating whether a
fragment's index values are merged
into the framebuffer using a logi-
cal operation. The initial value is
GL_FALSE. See glLogicOp.
GL_INDEX_MODE params returns a single boolean
value indicating whether the GL is
in color index mode (GL_TRUE) or
RGBA mode (GL_FALSE).
GL_INDEX_OFFSET params returns one value, the
offset added to color and stencil
indices during pixel transfers. The
initial value is 0. See
glPixelTransfer.
GL_INDEX_SHIFT params returns one value, the
amount that color and stencil
indices are shifted during pixel
transfers. The initial value is 0.
See glPixelTransfer.
GL_INDEX_WRITEMASK params returns one value, a mask
indicating which bitplanes of each
MirBSD #10-current Printed 2021-12-07 12
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
color index buffer can be written.
The initial value is all 1's. See
glIndexMask.
GL_LIGHTi params returns a single boolean
value indicating whether the speci-
fied light is enabled. The initial
value is GL_FALSE. See glLight and
glLightModel.
GL_LIGHTING params returns a single boolean
value indicating whether lighting
is enabled. The initial value is
GL_FALSE. See glLightModel.
GL_LIGHT_MODEL_AMBIENT params returns four values: the
red, green, blue, and alpha com-
ponents of the ambient intensity of
the entire scene. 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 (0.2, 0.2, 0.2,
1.0). See glLightModel.
GL_LIGHT_MODEL_COLOR_CONTROL
params returns single enumerated
value indicating whether specular
reflection calculations are
separated from normal lighting com-
putations. The initial value is
GL_SINGLE_COLOR.
GL_LIGHT_MODEL_LOCAL_VIEWER
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.
GL_LIGHT_MODEL_TWO_SIDE 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.
MirBSD #10-current Printed 2021-12-07 13
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
GL_LINE_SMOOTH params returns a single boolean
value indicating whether antialias-
ing of lines is enabled. The ini-
tial value is GL_FALSE. See
glLineWidth.
GL_LINE_SMOOTH_HINT params returns one value, a sym-
bolic constant indicating the mode
of the line antialiasing hint. The
initial value is GL_DONT_CARE. See
glHint.
GL_LINE_STIPPLE params returns a single boolean
value indicating whether stippling
of lines is enabled. The initial
value is GL_FALSE. See
glLineStipple.
GL_LINE_STIPPLE_PATTERN params returns one value, the 16-
bit line stipple pattern. The ini-
tial value is all 1's. See
glLineStipple.
GL_LINE_STIPPLE_REPEAT params returns one value, the line
stipple repeat factor. The initial
value is 1. See glLineStipple.
GL_LINE_WIDTH params returns one value, the line
width as specified with
glLineWidth. The initial value is
1.
GL_LINE_WIDTH_GRANULARITY
params returns one value, the width
difference between adjacent sup-
ported widths for antialiased
lines. See glLineWidth.
GL_LINE_WIDTH_RANGE params returns two values: the
smallest and largest supported
widths for antialiased lines. See
glLineWidth.
GL_LIST_BASE params returns one value, the base
offset added to all names in arrays
presented to glCallLists. The ini-
tial value is 0. See glListBase.
GL_LIST_INDEX params returns one value, the name
of the display list currently under
construction. 0 is returned if no
display list is currently under
MirBSD #10-current Printed 2021-12-07 14
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
construction. The initial value is
0. See glNewList.
GL_LIST_MODE params returns one value, a sym-
bolic constant indicating the con-
struction mode of the display list
currently under construction. The
initial value is 0. See glNewList.
GL_LOGIC_OP_MODE params returns one value, a sym-
bolic constant indicating the
selected logic operation mode. The
initial value is GL_COPY. See
glLogicOp.
GL_MAP1_COLOR_4 params returns a single boolean
value indicating whether 1D evalua-
tion generates colors. The initial
value is GL_FALSE. See glMap1.
GL_MAP1_GRID_DOMAIN params returns two values: the end-
points of the 1D map's grid domain.
The initial value is (0, 1). See
glMapGrid.
GL_MAP1_GRID_SEGMENTS params returns one value, the
number of partitions in the 1D
map's grid domain. The initial
value is 1. See glMapGrid.
GL_MAP1_INDEX params returns a single boolean
value indicating whether 1D evalua-
tion generates color indices. The
initial value is GL_FALSE. See
glMap1.
GL_MAP1_NORMAL params returns a single boolean
value indicating whether 1D evalua-
tion generates normals. The initial
value is GL_FALSE. See glMap1.
GL_MAP1_TEXTURE_COORD_1 params returns a single boolean
value indicating whether 1D evalua-
tion generates 1D texture coordi-
nates. The initial value is
GL_FALSE. See glMap1.
GL_MAP1_TEXTURE_COORD_2 params returns a single boolean
value indicating whether 1D evalua-
tion generates 2D texture coordi-
nates. The initial value is
GL_FALSE. See glMap1.
MirBSD #10-current Printed 2021-12-07 15
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
GL_MAP1_TEXTURE_COORD_3 params returns a single boolean
value indicating whether 1D evalua-
tion generates 3D texture coordi-
nates. The initial value is
GL_FALSE. See glMap1.
GL_MAP1_TEXTURE_COORD_4 params returns a single boolean
value indicating whether 1D evalua-
tion generates 4D texture coordi-
nates. The initial value is
GL_FALSE. See glMap1.
GL_MAP1_VERTEX_3 params returns a single boolean
value indicating whether 1D evalua-
tion generates 3D vertex coordi-
nates. The initial value is
GL_FALSE. See glMap1.
GL_MAP1_VERTEX_4 params returns a single boolean
value indicating whether 1D evalua-
tion generates 4D vertex coordi-
nates. The initial value is
GL_FALSE. See glMap1.
GL_MAP2_COLOR_4 params returns a single boolean
value indicating whether 2D evalua-
tion generates colors. The initial
value is GL_FALSE. See glMap2.
GL_MAP2_GRID_DOMAIN 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.
GL_MAP2_GRID_SEGMENTS 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.
GL_MAP2_INDEX params returns a single boolean
value indicating whether 2D evalua-
tion generates color indices. The
initial value is GL_FALSE. See
glMap2.
GL_MAP2_NORMAL params returns a single boolean
value indicating whether 2D evalua-
tion generates normals. The initial
value is GL_FALSE. See glMap2.
GL_MAP2_TEXTURE_COORD_1 params returns a single boolean
MirBSD #10-current Printed 2021-12-07 16
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
value indicating whether 2D evalua-
tion generates 1D texture coordi-
nates. The initial value is
GL_FALSE. See glMap2.
GL_MAP2_TEXTURE_COORD_2 params returns a single boolean
value indicating whether 2D evalua-
tion generates 2D texture coordi-
nates. The initial value is
GL_FALSE. See glMap2.
GL_MAP2_TEXTURE_COORD_3 params returns a single boolean
value indicating whether 2D evalua-
tion generates 3D texture coordi-
nates. The initial value is
GL_FALSE. See glMap2.
GL_MAP2_TEXTURE_COORD_4 params returns a single boolean
value indicating whether 2D evalua-
tion generates 4D texture coordi-
nates. The initial value is
GL_FALSE. See glMap2.
GL_MAP2_VERTEX_3 params returns a single boolean
value indicating whether 2D evalua-
tion generates 3D vertex coordi-
nates. The initial value is
GL_FALSE. See glMap2.
GL_MAP2_VERTEX_4 params returns a single boolean
value indicating whether 2D evalua-
tion generates 4D vertex coordi-
nates. The initial value is
GL_FALSE. See glMap2.
GL_MAP_COLOR 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.
GL_MAP_STENCIL 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.
GL_MATRIX_MODE params returns one value, a sym-
bolic constant indicating which
matrix stack is currently the
MirBSD #10-current Printed 2021-12-07 17
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
target of all matrix operations.
The initial value is GL_MODELVIEW.
See glMatrixMode.
GL_MAX_3D_TEXTURE_SIZE 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.
GL_MAX_CLIENT_ATTRIB_STACK_DEPTH
params returns one value indicating
the maximum supported depth of the
client attribute stack. See
glPushClientAttrib.
GL_MAX_ATTRIB_STACK_DEPTH
params returns one value, the max-
imum supported depth of the attri-
bute stack. The value must be at
least 16. See glPushAttrib.
GL_MAX_CLIP_PLANES params returns one value, the max-
imum number of application-defined
clipping planes. The value must be
at least 6. See glClipPlane.
GL_MAX_COLOR_MATRIX_STACK_DEPTH
params returns one value, the max-
imum supported depth of the color
matrix stack. The value must be at
least 2. See glPushMatrix.
GL_MAX_ELEMENTS_INDICES params returns one value, the
recommended maximum number of ver-
tex array indices. See
glDrawRangeElements.
GL_MAX_ELEMENTS_VERTICES params returns one value, the
recommended maximum number of ver-
tex array vertices. See
glDrawRangeElements.
GL_MAX_EVAL_ORDER params returns one value, the max-
imum equation order supported by 1D
and 2D evaluators. The value must
be at least 8. See glMap1 and
glMap2.
GL_MAX_LIGHTS params returns one value, the
MirBSD #10-current Printed 2021-12-07 18
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
maximum number of lights. The value
must be at least 8. See glLight.
GL_MAX_LIST_NESTING params returns one value, the max-
imum recursion depth allowed during
display-list traversal. The value
must be at least 64. See
glCallList.
GL_MAX_MODELVIEW_STACK_DEPTH
params returns one value, the max-
imum supported depth of the model-
view matrix stack. The value must
be at least 32. See glPushMatrix.
GL_MAX_NAME_STACK_DEPTH params returns one value, the max-
imum supported depth of the selec-
tion name stack. The value must be
at least 64. See glPushName.
GL_MAX_PIXEL_MAP_TABLE params returns one value, the max-
imum supported size of a glPixelMap
lookup table. The value must be at
least 32. See glPixelMap.
GL_MAX_PROJECTION_STACK_DEPTH
params returns one value, the max-
imum supported depth of the projec-
tion matrix stack. The value must
be at least 2. See glPushMatrix.
GL_MAX_TEXTURE_SIZE params returns one value. The value
gives a rough estimate of the larg-
est 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.
GL_MAX_TEXTURE_STACK_DEPTH
params returns one value, the max-
imum supported depth of the texture
matrix stack. The value must be at
least 2. See glPushMatrix.
GL_MAX_TEXTURE_UNITS_ARB params returns a single value indi-
cating the number of texture units
supported. The value must be at
least 1. See glActiveTextureARB.
GL_MAX_VIEWPORT_DIMS params returns two values: the
MirBSD #10-current Printed 2021-12-07 19
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
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.
GL_MINMAX params returns a single boolean
value indicating whether pixel min-
max values are computed. The ini-
tial value is GL_FALSE. See
glMinmax.
GL_MODELVIEW_MATRIX params returns sixteen values: the
modelview matrix on the top of the
modelview matrix stack. Initially
this matrix is the identity matrix.
See glPushMatrix.
GL_MODELVIEW_STACK_DEPTH params returns one value, the
number of matrices on the modelview
matrix stack. The initial value is
1. See glPushMatrix.
GL_NAME_STACK_DEPTH params returns one value, the
number of names on the selection
name stack. The initial value is 0.
See glPushName.
GL_NORMAL_ARRAY params returns a single boolean
value, indicating whether the nor-
mal array is enabled. The initial
value is GL_FALSE. See
glNormalPointer.
GL_NORMAL_ARRAY_STRIDE params returns one value, the byte
offset between consecutive normals
in the normal array. The initial
value is 0. See glNormalPointer.
GL_NORMAL_ARRAY_TYPE params returns one value, the data
type of each coordinate in the nor-
mal array. The initial value is
GL_FLOAT. See glNormalPointer.
GL_NORMALIZE 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.
MirBSD #10-current Printed 2021-12-07 20
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
GL_PACK_ALIGNMENT params returns one value, the byte
alignment used for writing pixel
data to memory. The initial value
is 4. See glPixelStore.
GL_PACK_IMAGE_HEIGHT params returns one value, the image
height used for writing pixel data
to memory. The initial value is 0.
See glPixelStore.
GL_PACK_LSB_FIRST params returns a single boolean
value indicating whether single-bit
pixels being written to memory are
written first to the least signifi-
cant bit of each unsigned byte. The
initial value is GL_FALSE. See
glPixelStore.
GL_PACK_ROW_LENGTH params returns one value, the row
length used for writing pixel data
to memory. The initial value is 0.
See glPixelStore.
GL_PACK_SKIP_IMAGES 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.
GL_PACK_SKIP_PIXELS 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.
GL_PACK_SKIP_ROWS 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.
GL_PACK_SWAP_BYTES 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.
GL_PERSPECTIVE_CORRECTION_HINT
params returns one value, a sym-
bolic constant indicating the mode
MirBSD #10-current Printed 2021-12-07 21
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
of the perspective correction hint.
The initial value is GL_DONT_CARE.
See glHint.
GL_PIXEL_MAP_A_TO_A_SIZE params returns one value, the size
of the alpha-to-alpha pixel trans-
lation table. The initial value is
1. See glPixelMap.
GL_PIXEL_MAP_B_TO_B_SIZE params returns one value, the size
of the blue-to-blue pixel transla-
tion table. The initial value is 1.
See glPixelMap.
GL_PIXEL_MAP_G_TO_G_SIZE params returns one value, the size
of the green-to-green pixel trans-
lation table. The initial value is
1. See glPixelMap.
GL_PIXEL_MAP_I_TO_A_SIZE params returns one value, the size
of the index-to-alpha pixel trans-
lation table. The initial value is
1. See glPixelMap.
GL_PIXEL_MAP_I_TO_B_SIZE params returns one value, the size
of the index-to-blue pixel transla-
tion table. The initial value is 1.
See glPixelMap.
GL_PIXEL_MAP_I_TO_G_SIZE params returns one value, the size
of the index-to-green pixel trans-
lation table. The initial value is
1. See glPixelMap.
GL_PIXEL_MAP_I_TO_I_SIZE params returns one value, the size
of the index-to-index pixel trans-
lation table. The initial value is
1. See glPixelMap.
GL_PIXEL_MAP_I_TO_R_SIZE params returns one value, the size
of the index-to-red pixel transla-
tion table. The initial value is 1.
See glPixelMap.
GL_PIXEL_MAP_R_TO_R_SIZE params returns one value, the size
of the red-to-red pixel translation
table. The initial value is 1. See
glPixelMap.
GL_PIXEL_MAP_S_TO_S_SIZE params returns one value, the size
of the stencil-to-stencil pixel
translation table. The initial
MirBSD #10-current Printed 2021-12-07 22
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
value is 1. See glPixelMap.
GL_POINT_SIZE params returns one value, the point
size as specified by glPointSize.
The initial value is 1.
GL_POINT_SIZE_GRANULARITY
params returns one value, the size
difference between adjacent sup-
ported sizes for antialiased
points. See glPointSize.
GL_POINT_SIZE_RANGE 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.
GL_POINT_SMOOTH params returns a single boolean
value indicating whether antialias-
ing of points is enabled. The ini-
tial value is GL_FALSE. See
glPointSize.
GL_POINT_SMOOTH_HINT params returns one value, a sym-
bolic constant indicating the mode
of the point antialiasing hint. The
initial value is GL_DONT_CARE. See
glHint.
GL_POLYGON_MODE params returns two values: symbolic
constants indicating whether
front-facing and back-facing
polygons are rasterized as points,
lines, or filled polygons. The ini-
tial value is GL_FILL. See
glPolygonMode.
GL_POLYGON_OFFSET_FACTOR params returns one value, the scal-
ing factor used to determine the
variable offset that is added to
the depth value of each fragment
generated when a polygon is raster-
ized. The initial value is 0. See
glPolygonOffset.
GL_POLYGON_OFFSET_UNITS 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
MirBSD #10-current Printed 2021-12-07 23
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
polygon is rasterized. The initial
value is 0. See glPolygonOffset.
GL_POLYGON_OFFSET_FILL 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.
GL_POLYGON_OFFSET_LINE 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.
GL_POLYGON_OFFSET_POINT 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.
GL_POLYGON_SMOOTH params returns a single boolean
value indicating whether antialias-
ing of polygons is enabled. The
initial value is GL_FALSE. See
glPolygonMode.
GL_POLYGON_SMOOTH_HINT params returns one value, a sym-
bolic constant indicating the mode
of the polygon antialiasing hint.
The initial value is GL_DONT_CARE.
See glHint.
GL_POLYGON_STIPPLE params returns a single boolean
value indicating whether polygon
stippling is enabled. The initial
value is GL_FALSE. See
glPolygonStipple.
GL_POST_COLOR_MATRIX_COLOR_TABLE
params returns a single boolean
value indicating whether post color
matrix transformation lookup is
enabled. The initial value is
GL_FALSE. See glColorTable.
GL_POST_COLOR_MATRIX_RED_BIAS
params returns one value, the red
bias factor applied to RGBA frag-
ments after color matrix transfor-
mations. The initial value is 0.
See glPixelTransfer.
MirBSD #10-current Printed 2021-12-07 24
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
GL_POST_COLOR_MATRIX_GREEN_BIAS
params returns one value, the green
bias factor applied to RGBA frag-
ments after color matrix transfor-
mations. The initial value is 0.
See glPixelTransfer
GL_POST_COLOR_MATRIX_BLUE_BIAS
params returns one value, the blue
bias factor applied to RGBA frag-
ments after color matrix transfor-
mations. The initial value is 0.
See glPixelTransfer.
GL_POST_COLOR_MATRIX_ALPHA_BIAS
params returns one value, the alpha
bias factor applied to RGBA frag-
ments after color matrix transfor-
mations. The initial value is 0.
See glPixelTransfer.
GL_POST_COLOR_MATRIX_RED_SCALE
params returns one value, the red
scale factor applied to RGBA frag-
ments after color matrix transfor-
mations. The initial value is 1.
See glPixelTransfer.
GL_POST_COLOR_MATRIX_GREEN_SCALE
params returns one value, the green
scale factor applied to RGBA frag-
ments after color matrix transfor-
mations. The initial value is 1.
See glPixelTransfer.
GL_POST_COLOR_MATRIX_BLUE_SCALE
params returns one value, the blue
scale factor applied to RGBA frag-
ments after color matrix transfor-
mations. The initial value is 1.
See glPixelTransfer.
GL_POST_COLOR_MATRIX_ALPHA_SCALE
params returns one value, the alpha
scale factor applied to RGBA frag-
ments after color matrix transfor-
mations. The initial value is 1.
See glPixelTransfer.
GL_POST_CONVOLUTION_COLOR_TABLE
params returns a single boolean
value indicating whether post
MirBSD #10-current Printed 2021-12-07 25
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
convolution lookup is enabled. The
initial value is GL_FALSE. See
glColorTable.
GL_POST_CONVOLUTION_RED_BIAS
params returns one value, the red
bias factor applied to RGBA frag-
ments after convolution. The ini-
tial value is 0. See
glPixelTransfer.
GL_POST_CONVOLUTION_GREEN_BIAS
params returns one value, the green
bias factor applied to RGBA frag-
ments after convolution. The ini-
tial value is 0. See
glPixelTransfer.
GL_POST_CONVOLUTION_BLUE_BIAS
params returns one value, the blue
bias factor applied to RGBA frag-
ments after convolution. The ini-
tial value is 0. See
glPixelTransfer.
GL_POST_CONVOLUTION_ALPHA_BIAS
params returns one value, the alpha
bias factor applied to RGBA frag-
ments after convolution. The ini-
tial value is 0. See
glPixelTransfer.
GL_POST_CONVOLUTION_RED_SCALE
params returns one value, the red
scale factor applied to RGBA frag-
ments after convolution. The ini-
tial value is 1. See
glPixelTransfer.
GL_POST_CONVOLUTION_GREEN_SCALE
params returns one value, the green
scale factor applied to RGBA frag-
ments after convolution. The ini-
tial value is 1. See
glPixelTransfer.
GL_POST_CONVOLUTION_BLUE_SCALE
params returns one value, the blue
scale factor applied to RGBA frag-
ments after convolution. The ini-
tial value is 1. See
glPixelTransfer.
MirBSD #10-current Printed 2021-12-07 26
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
GL_POST_CONVOLUTION_ALPHA_SCALE
params returns one value, the alpha
scale factor applied to RGBA frag-
ments after convolution. The ini-
tial value is 1. See
glPixelTransfer.
GL_PROJECTION_MATRIX params returns sixteen values: the
projection matrix on the top of the
projection matrix stack. Initially
this matrix is the identity matrix.
See glPushMatrix.
GL_PROJECTION_STACK_DEPTH
params returns one value, the
number of matrices on the projec-
tion matrix stack. The initial
value is 1. See glPushMatrix.
GL_READ_BUFFER params returns one value, a sym-
bolic constant indicating which
color buffer is selected for read-
ing. The initial value is GL_BACK
if there is a back buffer, other-
wise it is GL_FRONT. See
glReadPixels and glAccum.
GL_RED_BIAS params returns one value, the red
bias factor used during pixel
transfers. The initial value is 0.
GL_RED_BITS params returns one value, the
number of red bitplanes in each
color buffer.
GL_RED_SCALE params returns one value, the red
scale factor used during pixel
transfers. The initial value is 1.
See glPixelTransfer.
GL_RENDER_MODE params returns one value, a sym-
bolic constant indicating whether
the GL is in render, select, or
feedback mode. The initial value is
GL_RENDER. See glRenderMode.
GL_RESCALE_NORMAL params returns single boolean value
indicating whether normal rescaling
is enabled. See glEnable.
GL_RGBA_MODE params returns a single boolean
value indicating whether the GL is
MirBSD #10-current Printed 2021-12-07 27
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
in RGBA mode (true) or color index
mode (false). See glColor.
GL_SCISSOR_BOX 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.
GL_SCISSOR_TEST params returns a single boolean
value indicating whether scissoring
is enabled. The initial value is
GL_FALSE. See glScissor.
GL_SELECTION_BUFFER_SIZE params return one value, the size
of the selection buffer. See
glSelectBuffer.
GL_SEPARABLE_2D params returns a single boolean
value indicating whether 2D separ-
able convolution is enabled. The
initial value is GL_FALSE. See
glSeparableFilter2D.
GL_SHADE_MODEL params returns one value, a sym-
bolic constant indicating whether
the shading mode is flat or smooth.
The initial value is GL_SMOOTH. See
glShadeModel.
GL_SMOOTH_LINE_WIDTH_RANGE
params returns two values, the
smallest and largest supported
widths for antialiased lines. See
glLineWidth.
GL_SMOOTH_LINE_WIDTH_GRANULARITY
params returns one value, the
granularity of widths for
antialiased lines. See glLineWidth.
GL_SMOOTH_POINT_SIZE_RANGE
params returns two values, the
smallest and largest supported
widths for antialiased points. See
glPointSize.
GL_SMOOTH_POINT_SIZE_GRANULARITY
params returns one value, the
granularity of sizes for
MirBSD #10-current Printed 2021-12-07 28
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
antialiased points. See
glPointSize.
GL_STENCIL_BITS params returns one value, the
number of bitplanes in the stencil
buffer.
GL_STENCIL_CLEAR_VALUE params returns one value, the index
to which the stencil bitplanes are
cleared. The initial value is 0.
See glClearStencil.
GL_STENCIL_FAIL params returns one value, a sym-
bolic constant indicating what
action is taken when the stencil
test fails. The initial value is
GL_KEEP. See glStencilOp.
GL_STENCIL_FUNC params returns one value, a sym-
bolic 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.
GL_STENCIL_PASS_DEPTH_FAIL
params returns one value, a sym-
bolic constant indicating what
action is taken when the stencil
test passes, but the depth test
fails. The initial value is
GL_KEEP. See glStencilOp.
GL_STENCIL_PASS_DEPTH_PASS
params returns one value, a sym-
bolic constant indicating what
action is taken when the stencil
test passes and the depth test
passes. The initial value is
GL_KEEP. See glStencilOp.
GL_STENCIL_REF params returns one value, the
reference value that is compared
with the contents of the stencil
buffer. The initial value is 0. See
glStencilFunc.
GL_STENCIL_TEST params returns a single boolean
value indicating whether stencil
testing of fragments is enabled.
The initial value is GL_FALSE. See
MirBSD #10-current Printed 2021-12-07 29
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
glStencilFunc and glStencilOp.
GL_STENCIL_VALUE_MASK params returns one value, the mask
that is used to mask both the sten-
cil reference value and the stencil
buffer value before they are com-
pared. The initial value is all
1's. See glStencilFunc.
GL_STENCIL_WRITEMASK params returns one value, the mask
that controls writing of the sten-
cil bitplanes. The initial value is
all 1's. See glStencilMask.
GL_STEREO params returns a single boolean
value indicating whether stereo
buffers (left and right) are sup-
ported.
GL_SUBPIXEL_BITS params returns one value, an esti-
mate of the number of bits of sub-
pixel resolution that are used to
position rasterized geometry in
window coordinates. The initial
value
is 4.
GL_TEXTURE_1D params returns a single boolean
value indicating whether 1D texture
mapping is enabled. The initial
value is GL_FALSE. See
glTexImage1D.
GL_TEXTURE_BINDING_1D 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.
GL_TEXTURE_2D params returns a single boolean
value indicating whether 2D texture
mapping is enabled. The initial
value is GL_FALSE. See
glTexImage2D.
GL_TEXTURE_BINDING_2D 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.
GL_TEXTURE_3D params returns a single boolean
MirBSD #10-current Printed 2021-12-07 30
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
value indicating whether 3D texture
mapping is enabled. The initial
value is GL_FALSE. See
glTexImage3D.
GL_TEXTURE_BINDING_3D 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.
GL_TEXTURE_COORD_ARRAY params returns a single boolean
value indicating whether the tex-
ture coordinate array is enabled.
The initial value is GL_FALSE. See
glTexCoordPointer.
GL_TEXTURE_COORD_ARRAY_SIZE
params returns one value, the
number of coordinates per element
in the texture coordinate array.
The initial value is 4. See
glTexCoordPointer.
GL_TEXTURE_COORD_ARRAY_STRIDE
params returns one value, the byte
offset between consecutive elements
in the texture coordinate array.
The initial value is 0. See
glTexCoordPointer.
GL_TEXTURE_COORD_ARRAY_TYPE
params returns one value, the data
type of the coordinates in the tex-
ture coordinate array. The initial
value is GL_FLOAT. See
glTexCoordPointer.
GL_TEXTURE_GEN_Q params returns a single boolean
value indicating whether automatic
generation of the q texture coordi-
nate is enabled. The initial value
is GL_FALSE. See glTexGen.
GL_TEXTURE_GEN_R params returns a single boolean
value indicating whether automatic
generation of the r texture coordi-
nate is enabled. The initial value
is GL_FALSE. See glTexGen.
GL_TEXTURE_GEN_S params returns a single boolean
value indicating whether automatic
MirBSD #10-current Printed 2021-12-07 31
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
generation of the S texture coordi-
nate is enabled. The initial value
is GL_FALSE. See glTexGen.
GL_TEXTURE_GEN_T params returns a single boolean
value indicating whether automatic
generation of the T texture coordi-
nate is enabled. The initial value
is GL_FALSE. See glTexGen.
GL_TEXTURE_MATRIX params returns sixteen values: the
texture matrix on the top of the
texture matrix stack. Initially
this matrix is the identity matrix.
See glPushMatrix.
GL_TEXTURE_STACK_DEPTH params returns one value, the
number of matrices on the texture
matrix stack. The initial value is
1. See glPushMatrix.
GL_UNPACK_ALIGNMENT params returns one value, the byte
alignment used for reading pixel
data from memory. The initial value
is 4. See glPixelStore.
GL_UNPACK_IMAGE_HEIGHT params returns one value, the image
height used for reading pixel data
from memory. The initial is 0. See
glPixelStore.
GL_UNPACK_LSB_FIRST params returns a single boolean
value indicating whether single-bit
pixels being read from memory are
read first from the least signifi-
cant bit of each unsigned byte. The
initial value is GL_FALSE. See
glPixelStore.
GL_UNPACK_ROW_LENGTH params returns one value, the row
length used for reading pixel data
from memory. The initial value is
0. See glPixelStore.
GL_UNPACK_SKIP_IMAGES 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.
GL_UNPACK_SKIP_PIXELS params returns one value, the
number of pixel locations skipped
MirBSD #10-current Printed 2021-12-07 32
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
before the first pixel is read from
memory. The initial value is 0. See
glPixelStore.
GL_UNPACK_SKIP_ROWS 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.
GL_UNPACK_SWAP_BYTES params returns a single boolean
value indicating whether the bytes
of two-byte and four-byte pixel
indices and components are swapped
after being read from memory. The
initial value is GL_FALSE. See
glPixelStore.
GL_VERTEX_ARRAY params returns a single boolean
value indicating whether the vertex
array is enabled. The initial value
is GL_FALSE. See glVertexPointer.
GL_VERTEX_ARRAY_SIZE params returns one value, the
number of coordinates per vertex in
the vertex array. The initial value
is 4. See glVertexPointer.
GL_VERTEX_ARRAY_STRIDE params returns one value, the byte
offset between consecutive vertices
in the vertex array. The initial
value is 0. See glVertexPointer.
GL_VERTEX_ARRAY_TYPE params returns one value, the data
type of each coordinate in the ver-
tex array. The initial value is
GL_FLOAT. See glVertexPointer.
GL_VIEWPORT params returns four values: the x
and y window coordinates of the
viewport, followed by its width and
height. Initially the x and y win-
dow 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.
GL_ZOOM_X params returns one value, the x
pixel zoom factor. The initial
value is 1. See glPixelZoom.
MirBSD #10-current Printed 2021-12-07 33
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
GL_ZOOM_Y 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.
NOTES
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 avail-
able 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.
MirBSD #10-current Printed 2021-12-07 34
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
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.
ERRORS
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 exe-
cution of glEnd.
SEE ALSO
glGetClipPlane(3G), glGetColorTable(3G),
MirBSD #10-current Printed 2021-12-07 35
GLGET(3G) UNIX Programmer's Manual GLGET(3G)
glGetColorTableParameter(3G), glGetConvolutionFilter(3G),
glGetConvolutionParameter(3G), glGetError(3G),
glGetHistogram(3G), glGetHistogramParameter(3G),
glGetLight(3G), glGetMap(3G), glGetMaterial(3G),
glGetMinmax(3G), glGetMinmaxParameter(3G),
glGetPixelMap(3G), glGetPointerv(3G),
glGetPolygonStipple(3G), glGetSeparableFilter(3G),
glGetString(3G), glGetTexEnv(3G), glGetTexGen(3G),
glGetTexImage(3G), glGetTexLevelParameter(3G),
glGetTexParameter(3G), glIsEnabled(3G)
MirBSD #10-current Printed 2021-12-07 36