NAME
fglGetBooleanv, fglGetDoublev, fglGetFloatv, fglGetIntegerv
- return the value or values of a selected parameter
FORTRAN SPECIFICATION
SUBROUTINE fglGetBooleanv( INTEGER*4 pname,
CHARACTER*8 params )
FORTRAN SPECIFICATION
SUBROUTINE fglGetDoublev( INTEGER*4 pname,
CHARACTER*8 params )
FORTRAN SPECIFICATION
SUBROUTINE fglGetFloatv( INTEGER*4 pname,
CHARACTER*8 params )
FORTRAN SPECIFICATION
SUBROUTINE fglGetIntegerv( INTEGER*4 pname,
CHARACTER*8 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
parameter.
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
fglGetBooleanv 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
fglGetIntegerv 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 fglGetFloatv or fglGetDoublev is called, boolean
values are returned as GL_TRUE or GL_FALSE, and integer
values are converted to floating-point values.
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
fglClearAccum.
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_ALPHA_BIAS params returns one value, the alpha
bias factor used during pixel
transfers. The initial value is 0.
See fglPixelTransfer.
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 fglPixelTransfer.
GL_ALPHA_TEST params returns a single boolean
value indicating whether alpha
testing of fragments is enabled.
The initial value is GL_FALSE. See
fglAlphaFunc.
GL_ALPHA_TEST_FUNC params returns one value, the
symbolic name of the alpha test
function. The initial value is
GL_ALWAYS. See fglAlphaFunc.
GL_ALPHA_TEST_REF params returns one value, the
reference value for the alpha test.
The initial value is 0. See
fglAlphaFunc. 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
fglPushAttrib.
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 fglMap2.
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 fglBlendFunc.
GL_BLEND_COLOR_EXT params returns four values, the
red, green, blue, and alpha values
which are the components of the
blend color. See fglBlendColorEXT.
GL_BLEND_DST params returns one value, the
symbolic constant identifying the
destination blend function. The
initial value is GL_ZERO. See
fglBlendFunc.
GL_BLEND_EQUATION_EXT params returns one value, a
symbolic constant indicating
whether the blend equation is
GL_FUNC_ADD_EXT, GL_MIN_EXT or
GL_MAX_EXT. See
fglBlendEquationEXT.
GL_BLEND_SRC params returns one value, the
symbolic constant identifying the
source blend function. The initial
value is GL_ONE. See fglBlendFunc.
GL_BLUE_BIAS params returns one value, the blue
bias factor used during pixel
transfers. The initial value is 0.
See fglPixelTransfer.
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 fglPixelTransfer.
GL_CLIENT_ATTRIB_STACK_DEPTH
params returns one value indicating
the depth of the attribute stack.
The initial value is 0. See
fglPushClientAttrib.
GL_CLIP_PLANEi params returns a single boolean
value indicating whether the
specified clipping plane is
enabled. The initial value is
GL_FALSE. See fglClipPlane.
GL_COLOR_ARRAY params returns a single boolean
value indicating whether the color
array is enabled. The initial value
is GL_FALSE. See fglColorPointer.
GL_COLOR_ARRAY_SIZE params returns one value, the
number of components per color in
the color array. The initial value
is 4. See fglColorPointer.
GL_COLOR_ARRAY_STRIDE params returns one value, the byte
offset between consecutive colors
in the color array. The initial
value is 0. See fglColorPointer.
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 fglColorPointer.
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
fglClearColor.
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 fglLogicOp.
GL_COLOR_MATERIAL 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
fglColorMaterial.
GL_COLOR_MATERIAL_FACE 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 fglColorMaterial.
GL_COLOR_MATERIAL_PARAMETER
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 fglColorMaterial.
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 fglColorMask.
GL_CULL_FACE params returns a single boolean
value indicating whether polygon
culling is enabled. The initial
value is GL_FALSE. See fglCullFace.
GL_CULL_FACE_MODE params returns one value, a
symbolic constant indicating which
polygon faces are to be culled. The
initial value is GL_BACK. See
fglCullFace.
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
fglColor. 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 fglIndex.
GL_CURRENT_NORMAL 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
fglNormal.
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
fglRasterPos.
GL_CURRENT_RASTER_DISTANCE
params returns one value, the
distance from the eye to the
current raster position. The
initial value is 0. See
fglRasterPos.
GL_CURRENT_RASTER_INDEX params returns one value, the color
index of the current raster
position. The initial value is 1.
See fglRasterPos.
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
fglRasterPos.
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
fglRasterPos.
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 fglRasterPos and
fglTexCoord.
GL_CURRENT_TEXTURE_COORDS
params returns four values: the s,
t, r, and q current texture
coordinates. The initial value is
(0, 0, 0, 1). See fglTexCoord.
GL_DEPTH_BIAS params returns one value, the depth
bias factor used during pixel
transfers. The initial value is 0.
See fglPixelTransfer.
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
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
fglClearDepth.
GL_DEPTH_FUNC params returns one value, the
symbolic constant that indicates
the depth comparison function. The
initial value is GL_LESS. See
fglDepthFunc.
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
fglDepthRange.
GL_DEPTH_SCALE params returns one value, the depth
scale factor used during pixel
transfers. The initial value is 1.
See fglPixelTransfer.
GL_DEPTH_TEST params returns a single boolean
value indicating whether depth
testing of fragments is enabled.
The initial value is GL_FALSE. See
fglDepthFunc and fglDepthRange.
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
fglDepthMask.
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
buffering is supported.
GL_DRAW_BUFFER params returns one value, a
symbolic constant indicating which
buffers are being drawn to. See
fglDrawBuffer. 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 fglEdgeFlag.
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
fglEdgeFlagPointer.
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
fglEdgeFlagPointer.
GL_FOG params returns a single boolean
value indicating whether fogging is
enabled. The initial value is
GL_FALSE. See fglFog.
GL_FOG_COLOR 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
fglFog.
GL_FOG_DENSITY params returns one value, the fog
density parameter. The initial
value is 1. See fglFog.
GL_FOG_END params returns one value, the end
factor for the linear fog equation.
The initial value is 1. See fglFog.
GL_FOG_HINT params returns one value, a
symbolic constant indicating the
mode of the fog hint. The initial
value is GL_DONT_CARE. See
fglHint.
GL_FOG_INDEX params returns one value, the fog
color index. The initial value is
0. See fglFog.
GL_FOG_MODE params returns one value, a
symbolic constant indicating which
fog equation is selected. The
initial value is GL_EXP. See
fglFog.
GL_FOG_START params returns one value, the start
factor for the linear fog equation.
The initial value is 0. See fglFog.
GL_FRONT_FACE 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
fglFrontFace.
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 fglPixelTransfer.
GL_INDEX_ARRAY params returns a single boolean
value indicating whether the color
index array is enabled. The initial
value is GL_FALSE. See
fglIndexPointer.
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
fglIndexPointer.
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 fglIndexPointer.
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 fglClearIndex.
GL_INDEX_LOGIC_OP 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 fglLogicOp.
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
fglPixelTransfer.
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 fglPixelTransfer.
GL_INDEX_WRITEMASK 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
fglIndexMask.
GL_LIGHTi params returns a single boolean
value indicating whether the
specified light is enabled. The
initial value is GL_FALSE. See
fglLight and fglLightModel.
GL_LIGHTING params returns a single boolean
value indicating whether lighting
is enabled. The initial value is
GL_FALSE. See fglLightModel.
GL_LIGHT_MODEL_AMBIENT 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 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 fglLightModel.
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
fglLightModel.
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 fglLightModel.
GL_LINE_SMOOTH params returns a single boolean
value indicating whether
antialiasing of lines is enabled.
The initial value is GL_FALSE. See
fglLineWidth.
GL_LINE_SMOOTH_HINT params returns one value, a
symbolic constant indicating the
mode of the line antialiasing hint.
The initial value is GL_DONT_CARE.
See fglHint.
GL_LINE_STIPPLE params returns a single boolean
value indicating whether stippling
of lines is enabled. The initial
value is GL_FALSE. See
fglLineStipple.
GL_LINE_STIPPLE_PATTERN params returns one value, the 16-
bit line stipple pattern. The
initial value is all 1's. See
fglLineStipple.
GL_LINE_STIPPLE_REPEAT params returns one value, the line
stipple repeat factor. The initial
value is 1. See fglLineStipple.
GL_LINE_WIDTH params returns one value, the line
width as specified with
fglLineWidth. The initial value is
1.
GL_LINE_WIDTH_GRANULARITY
params returns one value, the width
difference between adjacent
supported widths for antialiased
lines. See fglLineWidth.
GL_LINE_WIDTH_RANGE params returns two values: the
smallest and largest supported
widths for antialiased lines. See
fglLineWidth.
GL_LIST_BASE params returns one value, the base
offset added to all names in arrays
presented to fglCallLists. The
initial value is 0. See
fglListBase.
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
construction. The initial value is
0. See fglNewList.
GL_LIST_MODE params returns one value, a
symbolic constant indicating the
construction mode of the display
list currently under construction.
The initial value is 0. See
fglNewList.
GL_LOGIC_OP_MODE params returns one value, a
symbolic constant indicating the
selected logic operation mode. The
initial value is GL_COPY. See
fglLogicOp.
GL_MAP1_COLOR_4 params returns a single boolean
value indicating whether 1D
evaluation generates colors. The
initial value is GL_FALSE. See
fglMap1.
GL_MAP1_GRID_DOMAIN params returns two values: the
endpoints of the 1D map's grid
domain. The initial value is (0,
1). See fglMapGrid.
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 fglMapGrid.
GL_MAP1_INDEX params returns a single boolean
value indicating whether 1D
evaluation generates color indices.
The initial value is GL_FALSE. See
fglMap1.
GL_MAP1_NORMAL params returns a single boolean
value indicating whether 1D
evaluation generates normals. The
initial value is GL_FALSE. See
fglMap1.
GL_MAP1_TEXTURE_COORD_1 params returns a single boolean
value indicating whether 1D
evaluation generates 1D texture
coordinates. The initial value is
GL_FALSE. See fglMap1.
GL_MAP1_TEXTURE_COORD_2 params returns a single boolean
value indicating whether 1D
evaluation generates 2D texture
coordinates. The initial value is
GL_FALSE. See fglMap1.
GL_MAP1_TEXTURE_COORD_3 params returns a single boolean
value indicating whether 1D
evaluation generates 3D texture
coordinates. The initial value is
GL_FALSE. See fglMap1.
GL_MAP1_TEXTURE_COORD_4 params returns a single boolean
value indicating whether 1D
evaluation generates 4D texture
coordinates. The initial value is
GL_FALSE. See fglMap1.
GL_MAP1_VERTEX_3 params returns a single boolean
value indicating whether 1D
evaluation generates 3D vertex
coordinates. The initial value is
GL_FALSE. See fglMap1.
GL_MAP1_VERTEX_4 params returns a single boolean
value indicating whether 1D
evaluation generates 4D vertex
coordinates. The initial value is
GL_FALSE. See fglMap1.
GL_MAP2_COLOR_4 params returns a single boolean
value indicating whether 2D
evaluation generates colors. The
initial value is GL_FALSE. See
fglMap2.
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 fglMapGrid.
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
fglMapGrid.
GL_MAP2_INDEX params returns a single boolean
value indicating whether 2D
evaluation generates color indices.
The initial value is GL_FALSE. See
fglMap2.
GL_MAP2_NORMAL params returns a single boolean
value indicating whether 2D
evaluation generates normals. The
initial value is GL_FALSE. See
fglMap2.
GL_MAP2_TEXTURE_COORD_1 params returns a single boolean
value indicating whether 2D
evaluation generates 1D texture
coordinates. The initial value is
GL_FALSE. See fglMap2.
GL_MAP2_TEXTURE_COORD_2 params returns a single boolean
value indicating whether 2D
evaluation generates 2D texture
coordinates. The initial value is
GL_FALSE. See fglMap2.
GL_MAP2_TEXTURE_COORD_3 params returns a single boolean
value indicating whether 2D
evaluation generates 3D texture
coordinates. The initial value is
GL_FALSE. See fglMap2.
GL_MAP2_TEXTURE_COORD_4 params returns a single boolean
value indicating whether 2D
evaluation generates 4D texture
coordinates. The initial value is
GL_FALSE. See fglMap2.
GL_MAP2_VERTEX_3 params returns a single boolean
value indicating whether 2D
evaluation generates 3D vertex
coordinates. The initial value is
GL_FALSE. See fglMap2.
GL_MAP2_VERTEX_4 params returns a single boolean
value indicating whether 2D
evaluation generates 4D vertex
coordinates. The initial value is
GL_FALSE. See fglMap2.
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 fglPixelTransfer.
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
fglPixelTransfer.
GL_MATRIX_MODE 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 fglMatrixMode.
GL_MAX_CLIENT_ATTRIB_STACK_DEPTH
params returns one value indicating
the maximum supported depth of the
client attribute stack. See
fglPushClientAttrib.
GL_MAX_ATTRIB_STACK_DEPTH
params returns one value, the
maximum supported depth of the
attribute stack. The value must be
at least 16. See fglPushAttrib.
GL_MAX_CLIP_PLANES params returns one value, the
maximum number of application-
defined clipping planes. The value
must be at least 6. See
fglClipPlane.
GL_MAX_EVAL_ORDER params returns one value, the
maximum equation order supported by
1D and 2D evaluators. The value
must be at least 8. See fglMap1
and fglMap2.
GL_MAX_LIGHTS params returns one value, the
maximum number of lights. The value
must be at least 8. See fglLight.
GL_MAX_LIST_NESTING params returns one value, the
maximum recursion depth allowed
during display-list traversal. The
value must be at least 64. See
fglCallList.
GL_MAX_MODELVIEW_STACK_DEPTH
params returns one value, the
maximum supported depth of the
modelview matrix stack. The value
must be at least 32. See
fglPushMatrix.
GL_MAX_NAME_STACK_DEPTH params returns one value, the
maximum supported depth of the
selection name stack. The value
must be at least 64. See
fglPushName.
GL_MAX_PIXEL_MAP_TABLE params returns one value, the
maximum supported size of a
fglPixelMap lookup table. The value
must be at least 32. See
fglPixelMap.
GL_MAX_PROJECTION_STACK_DEPTH
params returns one value, the
maximum supported depth of the
projection matrix stack. The value
must be at least 2. See
fglPushMatrix.
GL_MAX_TEXTURE_SIZE 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
fglTexImage1D and fglTexImage2D.
GL_MAX_TEXTURE_STACK_DEPTH
params returns one value, the
maximum supported depth of the
texture matrix stack. The value
must be at least 2. See
fglPushMatrix.
GL_MAX_VIEWPORT_DIMS 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 fglViewport.
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 fglPushMatrix.
GL_MODELVIEW_STACK_DEPTH params returns one value, the
number of matrices on the modelview
matrix stack. The initial value is
1. See fglPushMatrix.
GL_NAME_STACK_DEPTH params returns one value, the
number of names on the selection
name stack. The initial value is 0.
See fglPushName.
GL_NORMAL_ARRAY params returns a single boolean
value, indicating whether the
normal array is enabled. The
initial value is GL_FALSE. See
fglNormalPointer.
GL_NORMAL_ARRAY_STRIDE params returns one value, the byte
offset between consecutive normals
in the normal array. The initial
value is 0. See fglNormalPointer.
GL_NORMAL_ARRAY_TYPE params returns one value, the data
type of each coordinate in the
normal array. The initial value is
GL_FLOAT. See fglNormalPointer.
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
fglNormal.
GL_PACK_ALIGNMENT params returns one value, the byte
alignment used for writing pixel
data to memory. The initial value
is 4. See fglPixelStore.
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
significant bit of each unsigned
byte. The initial value is
GL_FALSE. See fglPixelStore.
GL_PACK_ROW_LENGTH params returns one value, the row
length used for writing pixel data
to memory. The initial value is 0.
See fglPixelStore.
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 fglPixelStore.
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 fglPixelStore.
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
fglPixelStore.
GL_PERSPECTIVE_CORRECTION_HINT
params returns one value, a
symbolic constant indicating the
mode of the perspective correction
hint. The initial value is
GL_DONT_CARE. See fglHint.
GL_PIXEL_MAP_A_TO_A_SIZE params returns one value, the size
of the alpha-to-alpha pixel
translation table. The initial
value is 1. See fglPixelMap.
GL_PIXEL_MAP_B_TO_B_SIZE params returns one value, the size
of the blue-to-blue pixel
translation table. The initial
value is 1. See fglPixelMap.
GL_PIXEL_MAP_G_TO_G_SIZE params returns one value, the size
of the green-to-green pixel
translation table. The initial
value is 1. See fglPixelMap.
GL_PIXEL_MAP_I_TO_A_SIZE params returns one value, the size
of the index-to-alpha pixel
translation table. The initial
value is 1. See fglPixelMap.
GL_PIXEL_MAP_I_TO_B_SIZE params returns one value, the size
of the index-to-blue pixel
translation table. The initial
value is 1. See fglPixelMap.
GL_PIXEL_MAP_I_TO_G_SIZE params returns one value, the size
of the index-to-green pixel
translation table. The initial
value is 1. See fglPixelMap.
GL_PIXEL_MAP_I_TO_I_SIZE params returns one value, the size
of the index-to-index pixel
translation table. The initial
value is 1. See fglPixelMap.
GL_PIXEL_MAP_I_TO_R_SIZE params returns one value, the size
of the index-to-red pixel
translation table. The initial
value is 1. See fglPixelMap.
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 fglPixelMap.
GL_PIXEL_MAP_S_TO_S_SIZE params returns one value, the size
of the stencil-to-stencil pixel
translation table. The initial
value is 1. See fglPixelMap.
GL_POINT_SIZE params returns one value, the point
size as specified by fglPointSize.
The initial value is 1.
GL_POINT_SIZE_GRANULARITY
params returns one value, the size
difference between adjacent
supported sizes for antialiased
points. See fglPointSize.
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 fglPointSize.
GL_POINT_SMOOTH params returns a single boolean
value indicating whether
antialiasing of points is enabled.
The initial value is GL_FALSE. See
fglPointSize.
GL_POINT_SMOOTH_HINT params returns one value, a
symbolic constant indicating the
mode of the point antialiasing
hint. The initial value is
GL_DONT_CARE. See fglHint.
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 initial value is GL_FILL. See
fglPolygonMode.
GL_POLYGON_OFFSET_FACTOR 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 fglPolygonOffset.
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
polygon is rasterized. The initial
value is 0. See fglPolygonOffset.
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 fglPolygonOffset.
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 fglPolygonOffset.
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 fglPolygonOffset.
GL_POLYGON_SMOOTH params returns a single boolean
value indicating whether
antialiasing of polygons is
enabled. The initial value is
GL_FALSE. See fglPolygonMode.
GL_POLYGON_SMOOTH_HINT params returns one value, a
symbolic constant indicating the
mode of the polygon antialiasing
hint. The initial value is
GL_DONT_CARE. See fglHint.
GL_POLYGON_STIPPLE params returns a single boolean
value indicating whether polygon
stippling is enabled. The initial
value is GL_FALSE. See
fglPolygonStipple.
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 fglPushMatrix.
GL_PROJECTION_STACK_DEPTH
params returns one value, the
number of matrices on the
projection matrix stack. The
initial value is 1. See
fglPushMatrix.
GL_READ_BUFFER 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
fglReadPixels and fglAccum.
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 fglPixelTransfer.
GL_RENDER_MODE 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
fglRenderMode.
GL_RGBA_MODE params returns a single boolean
value indicating whether the GL is
in RGBA mode (true) or color index
mode (false). See fglColor.
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
fglScissor.
GL_SCISSOR_TEST params returns a single boolean
value indicating whether scissoring
is enabled. The initial value is
GL_FALSE. See fglScissor.
GL_SHADE_MODEL params returns one value, a
symbolic constant indicating
whether the shading mode is flat or
smooth. The initial value is
GL_SMOOTH. See fglShadeModel.
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 fglClearStencil.
GL_STENCIL_FAIL params returns one value, a
symbolic constant indicating what
action is taken when the stencil
test fails. The initial value is
GL_KEEP. See fglStencilOp.
GL_STENCIL_FUNC 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
fglStencilFunc.
GL_STENCIL_PASS_DEPTH_FAIL
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 fglStencilOp.
GL_STENCIL_PASS_DEPTH_PASS
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 fglStencilOp.
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
fglStencilFunc.
GL_STENCIL_TEST params returns a single boolean
value indicating whether stencil
testing of fragments is enabled.
The initial value is GL_FALSE. See
fglStencilFunc and fglStencilOp.
GL_STENCIL_VALUE_MASK 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 fglStencilFunc.
GL_STENCIL_WRITEMASK params returns one value, the mask
that controls writing of the
stencil bitplanes. The initial
value is all 1's. See
fglStencilMask.
GL_STEREO params returns a single boolean
value indicating whether stereo
buffers (left and right) are
supported.
GL_SUBPIXEL_BITS 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.
GL_TEXTURE_1D params returns a single boolean
value indicating whether 1D texture
mapping is enabled. The initial
value is GL_FALSE. See
fglTexImage1D.
GL_TEXTURE_1D_BINDING params returns a single value, the
name of the texture currently bound
to the target GL_TEXTURE_1D. The
initial value is 0. See
fglBindTexture.
GL_TEXTURE_2D params returns a single boolean
value indicating whether 2D texture
mapping is enabled. The initial
value is GL_FALSE. See
fglTexImage2D.
GL_TEXTURE_2D_BINDING params returns a single value, the
name of the texture currently bound
to the target GL_TEXTURE_2D. The
initial value is 0. See
fglBindTexture.
GL_TEXTURE_COORD_ARRAY params returns a single boolean
value indicating whether the
texture coordinate array is
enabled. The initial value is
GL_FALSE. See fglTexCoordPointer.
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
fglTexCoordPointer.
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
fglTexCoordPointer.
GL_TEXTURE_COORD_ARRAY_TYPE
params returns one value, the data
type of the coordinates in the
texture coordinate array. The
initial value is GL_FLOAT. See
fglTexCoordPointer.
GL_TEXTURE_GEN_Q params returns a single boolean
value indicating whether automatic
generation of the q texture
coordinate is enabled. The initial
value is GL_FALSE. See fglTexGen.
GL_TEXTURE_GEN_R params returns a single boolean
value indicating whether automatic
generation of the r texture
coordinate is enabled. The initial
value is GL_FALSE. See fglTexGen.
GL_TEXTURE_GEN_S params returns a single boolean
value indicating whether automatic
generation of the S texture
coordinate is enabled. The initial
value is GL_FALSE. See fglTexGen.
GL_TEXTURE_GEN_T params returns a single boolean
value indicating whether automatic
generation of the T texture
coordinate is enabled. The initial
value is GL_FALSE. See fglTexGen.
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 fglPushMatrix.
GL_TEXTURE_STACK_DEPTH params returns one value, the
number of matrices on the texture
matrix stack. The initial value is
1. See fglPushMatrix.
GL_UNPACK_ALIGNMENT params returns one value, the byte
alignment used for reading pixel
data from memory. The initial value
is 4. See fglPixelStore.
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
significant bit of each unsigned
byte. The initial value is
GL_FALSE. See fglPixelStore.
GL_UNPACK_ROW_LENGTH params returns one value, the row
length used for reading pixel data
from memory. The initial value is
0. See fglPixelStore.
GL_UNPACK_SKIP_PIXELS params returns one value, the
number of pixel locations skipped
before the first pixel is read from
memory. The initial value is 0. See
fglPixelStore.
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 fglPixelStore.
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
fglPixelStore.
GL_VERTEX_ARRAY params returns a single boolean
value indicating whether the vertex
array is enabled. The initial value
is GL_FALSE. See fglVertexPointer.
GL_VERTEX_ARRAY_SIZE params returns one value, the
number of coordinates per vertex in
the vertex array. The initial value
is 4. See fglVertexPointer.
GL_VERTEX_ARRAY_STRIDE params returns one value, the byte
offset between consecutive vertexes
in the vertex array. The initial
value is 0. See fglVertexPointer.
GL_VERTEX_ARRAY_TYPE params returns one value, the data
type of each coordinate in the
vertex array. The initial value is
GL_FLOAT. See fglVertexPointer.
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
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 fglViewport.
GL_ZOOM_X params returns one value, the x
pixel zoom factor. The initial
value is 1. See fglPixelZoom.
GL_ZOOM_Y params returns one value, the y
pixel zoom factor. The initial
value is 1. See fglPixelZoom.
Many of the boolean parameters can also be queried more
easily using fglIsEnabled.
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
available only if the GL version is 1.1 or greater.
ERRORS
GL_INVALID_ENUM is generated if pname is not an accepted
value.
GL_INVALID_OPERATION is generated if fglGet is executed
between the execution of fglBegin and the corresponding
execution of fglEnd.
SEE ALSO
fglGetClipPlane, fglGetError, fglGetLight, fglGetMap,
fglGetMaterial, fglGetPixelMap, fglGetPointerv,
fglGetPolygonStipple, fglGetString, fglGetTexEnv,
fglGetTexGen, fglGetTexImage, fglGetTexLevelParameter,
fglGetTexParameter, fglIsEnabled