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glPopAttrib(3G)						       glPopAttrib(3G)

NAME
       glPushAttrib, glPopAttrib - push and pop the server attribute stack

SYNOPSIS
       void glPushAttrib(
	       GLbitfield mask ); void glPopAttrib(
	       void );

PARAMETERS
       Specifies  a  mask  that indicates which attributes to save. Values for
       mask are listed below.

DESCRIPTION
       glPushAttrib() takes one argument, a mask that indicates	 which	groups
       of  state  variables to save on the attribute stack. Symbolic constants
       are used to set bits in the mask.  mask	is  typically  constructed  by
       ORing   several	 of   these   constants	 together.  The	 special  mask
       GL_ALL_ATTRIB_BITS can be used to save all stackable states.

       The symbolic mask constants and their associated GL state are  as  fol‐
       lows (the second column lists which attributes are saved):

       GL_ACCUM_BUFFER_BIT	Accumulation buffer clear value
       GL_COLOR_BUFFER_BIT	GL_ALPHA_TEST enable bit
				Alpha test function and reference value
				GL_BLEND enable bit
				Blending  source  and destination func‐
				tions
				Constant blend color
				Blending equation
				GL_DITHER enable bit
				GL_DRAW_BUFFER setting
				GL_COLOR_LOGIC_OP enable bit
				GL_INDEX_LOGIC_OP enable bit
				Logic op function
				Color mode and index mode clear values
				Color mode and index mode writemasks
       GL_CURRENT_BIT		Current RGBA color
				Current color index
				Current normal vector
				Current texture coordinates
				Current raster position
				GL_CURRENT_RASTER_POSITION_VALID option
				RGBA  color  associated	 with	current
				raster position
				Color  index  associated  with	current
				raster position
				Texture	 coordinates  associated   with
				current raster position
				GL_EDGE_FLAG option
       GL_DEPTH_BUFFER_BIT	GL_DEPTH_TEST enable bit
				Depth buffer test function
				Depth buffer clear value
				GL_DEPTH_WRITEMASK enable bit
       GL_ENABLE_BIT		GL_ALPHA_TEST option
				GL_AUTO_NORMAL option
				GL_BLEND option
				Enable	 bits  for  the	 user-definable
				clipping planes
				GL_COLOR_MATERIAL
				GL_CULL_FACE option

				GL_DEPTH_TEST option
				GL_DITHER option
				GL_FOG option
				GL_LIGHTi where 0 <= i<GL_MAX_LIGHTS
				GL_LIGHTING option
				GL_LINE_SMOOTH option
				GL_LINE_STIPPLE option
				GL_COLOR_LOGIC_OP option
				GL_INDEX_LOGIC_OP option
				GL_MAP1_x where x is a map type
				GL_MAP2_x where x is a map type
				GL_NORMALIZE option
				GL_POINT_SMOOTH option
				GL_POLYGON_OFFSET_LINE option
				GL_POLYGON_OFFSET_FILL option
				GL_POLYGON_OFFSET_POINT option
				GL_POLYGON_SMOOTH option
				GL_POLYGON_STIPPLE option
				GL_SCISSOR_TEST option
				GL_STENCIL_TEST option
				GL_TEXTURE_1D option
				GL_TEXTURE_2D option
				GL_TEXTURE_3D option
				Flags GL_TEXTURE_GEN_x where x is S, T,
				R, or Q
       GL_EVAL_BIT		GL_MAP1_x enable bits, where x is a map
				type
				GL_MAP2_x enable bits, where x is a map
				type
				1D grid endpoints and divisions
				2D grid endpoints and divisions
				GL_AUTO_NORMAL enable bit
       GL_FOG_BIT		GL_FOG enable bit
				Fog color
				Fog density
				Linear fog start
				Linear fog end
				Fog index
				GL_FOG_MODE value
       GL_HINT_BIT		GL_PERSPECTIVE_CORRECTION_HINT setting
				GL_POINT_SMOOTH_HINT setting
				GL_LINE_SMOOTH_HINT setting
				GL_POLYGON_SMOOTH_HINT setting
				GL_FOG_HINT setting
       GL_LIGHTING_BIT		GL_COLOR_MATERIAL enable bit
				GL_COLOR_MATERIAL_FACE value
				Color	material  parameters  that  are
				tracking the current color
				Ambient scene color
				GL_LIGHT_MODEL_LOCAL_VIEWER value
				GL_LIGHT_MODEL_TWO_SIDE setting
				GL_LIGHTING enable bit
				Enable bit for each light
				Ambient, diffuse, and  specular	 inten‐
				sity for each light
				Direction, position, exponent, and cut‐
				off angle for each light
				Constant, linear, and quadratic attenu‐
				ation factors for each light
				Ambient,  diffuse,  specular, and emis‐
				sive color for each material
				Ambient, diffuse,  and	specular  color
				indices for each material
				Specular exponent for each material
				GL_SHADE_MODEL setting

       GL_LINE_BIT		GL_LINE_SMOOTH option
				GL_LINE_STIPPLE enable bit
				Line stipple pattern and repeat counter
				Line width
       GL_LIST_BIT		GL_LIST_BASE setting
       GL_PIXEL_MODE_BIT	GL_RED_BIAS and GL_RED_SCALE settings
				GL_GREEN_BIAS and GL_GREEN_SCALE values
				GL_BLUE_BIAS and GL_BLUE_SCALE
				GL_ALPHA_BIAS and GL_ALPHA_SCALE
				GL_DEPTH_BIAS and GL_DEPTH_SCALE
				GL_INDEX_OFFSET and GL_INDEX_SHIFT val‐
				ues
				GL_MAP_COLOR and GL_MAP_STENCIL options
				GL_ZOOM_X and GL_ZOOM_Y factors
				GL_READ_BUFFER setting
       GL_POINT_BIT		GL_POINT_SMOOTH option
				Point size
       GL_POLYGON_BIT		GL_CULL_FACE enable bit
				GL_CULL_FACE_MODE value
				GL_FRONT_FACE indicator
				GL_POLYGON_MODE setting
				GL_POLYGON_SMOOTH option
				GL_POLYGON_STIPPLE enable bit
				GL_POLYGON_OFFSET_FILL option
				GL_POLYGON_OFFSET_LINE option
				GL_POLYGON_OFFSET_POINT option
				GL_POLYGON_OFFSET_FACTOR
				GL_POLYGON_OFFSET_UNITS
       GL_POLYGON_STIPPLE_BIT	 Polygon stipple image
       GL_SCISSOR_BIT		GL_SCISSOR_TEST option
				Scissor box
       GL_STENCIL_BUFFER_BIT	GL_STENCIL_TEST enable bit
				Stencil function and reference value
				Stencil value mask
				Stencil fail, pass,  and  depth	 buffer
				pass actions
				Stencil buffer clear value
				Stencil buffer writemask
       GL_TEXTURE_BIT		Enable	bits for the four texture coor‐
				dinates
				Border color for each texture image
				Minification function for each	texture
				image
				Magnification function for each texture
				image
				Texture coordinates and wrap  mode  for
				each texture image
				Color  and  mode for each texture envi‐
				ronment
				Enable bits GL_TEXTURE_GEN_x, x	 is  S,
				T, R, and Q
				GL_TEXTURE_GEN_MODE  setting  for S, T,
				R, and Q
				glTexGen() plane equations for S, T, R,
				and Q
				Current	 texture bindings (for example,
				GL_TEXTURE_BINDING_2D)
       GL_TRANSFORM_BIT		Coefficients of the six clipping planes
				Enable	bits  for  the	 user-definable
				clipping planes
				GL_MATRIX_MODE value
				GL_NORMALIZE option
				GL_RESCALE_NORMAL option
       GL_VIEWPORT_BIT		Depth range (near and far)
				Viewport origin and extent

       glPopAttrib() restores the values of the state variables saved with the
       last glPushAttrib() command. Those not saved are left unchanged.

       It is an error to  push	attributes  onto  a  full  stack,  or  to  pop
       attributes  off an empty stack. In either case, the error option is set
       and no other change is made to GL state.

       Initially, the attribute stack is empty.

NOTES
       Not all values for GL state can be saved on the	attribute  stack.  For
       example,	 render	 mode  state,  and select and feedback state cannot be
       saved.  Client state must be saved with glPushClientAttrib().

       The depth of the attribute stack depends on the implementation, but  it
       must be at least 16.

       When  the  GL_ARB_multitexture extension is supported, pushing and pop‐
       ping texture state apples to all supported texture units.

ERRORS
       GL_STACK_OVERFLOW is generated if glPushAttrib() is  called  while  the
       attribute stack is full.

       GL_STACK_UNDERFLOW  is  generated  if glPopAttrib() is called while the
       attribute stack is empty.

       GL_INVALID_OPERATION is generated if glPushAttrib() or glPopAttrib() is
       executed	 between the execution of glBegin() and the corresponding exe‐
       cution of glEnd().

ASSOCIATED GETS
       glGet() with argument GL_ATTRIB_STACK_DEPTH
       glGet() with argument GL_MAX_ATTRIB_STACK_DEPTH

SEE ALSO
       glGet(3), glGetClipPlane(3), glGetError(3), glGetLight(3), glGetMap(3),
       glGetMaterial(3),   glGetPixelMap(3),   glGetPolygonStipple(3),	glGet‐
       String(3),  glGetTexEnv(3),  glGetTexGen(3),  glGetTexImage(3),	glGet‐
       TexLevelParameter(3),  glGetTexParameter(3),  glIsEnabled(3)(), glPush‐
       ClientAttrib(3)

							       glPopAttrib(3G)
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