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GLRASTERPOS(3G)						       GLRASTERPOS(3G)

NAME
       glRasterPos2d,  glRasterPos2f,  glRasterPos2i, glRasterPos2s, glRaster‐
       Pos3d,  glRasterPos3f,  glRasterPos3i,  glRasterPos3s,	glRasterPos4d,
       glRasterPos4f,  glRasterPos4i, glRasterPos4s, glRasterPos2dv, glRaster‐
       Pos2fv, glRasterPos2iv, glRasterPos2sv, glRasterPos3dv, glRasterPos3fv,
       glRasterPos3iv,	  glRasterPos3sv,    glRasterPos4dv,   glRasterPos4fv,
       glRasterPos4iv, glRasterPos4sv - specify the raster position for	 pixel
       operations

C SPECIFICATION
       void glRasterPos2d( GLdouble x,
			   GLdouble y )
       void glRasterPos2f( GLfloat x,
			   GLfloat y )
       void glRasterPos2i( GLint x,
			   GLint y )
       void glRasterPos2s( GLshort x,
			   GLshort y )
       void glRasterPos3d( GLdouble x,
			   GLdouble y,
			   GLdouble z )
       void glRasterPos3f( GLfloat x,
			   GLfloat y,
			   GLfloat z )
       void glRasterPos3i( GLint x,
			   GLint y,
			   GLint z )
       void glRasterPos3s( GLshort x,
			   GLshort y,
			   GLshort z )
       void glRasterPos4d( GLdouble x,
			   GLdouble y,
			   GLdouble z,
			   GLdouble w )
       void glRasterPos4f( GLfloat x,
			   GLfloat y,
			   GLfloat z,
			   GLfloat w )
       void glRasterPos4i( GLint x,
			   GLint y,
			   GLint z,
			   GLint w )
       void glRasterPos4s( GLshort x,
			   GLshort y,
			   GLshort z,
			   GLshort w )

       delim $$

PARAMETERS
       x, y, z, w
		Specify	 the  $x$,  $y$,  $z$,	and $w$ object coordinates (if
		present) for the raster position.

C SPECIFICATION
       void glRasterPos2dv( const GLdouble *v )
       void glRasterPos2fv( const GLfloat *v )
       void glRasterPos2iv( const GLint *v )
       void glRasterPos2sv( const GLshort *v )
       void glRasterPos3dv( const GLdouble *v )
       void glRasterPos3fv( const GLfloat *v )
       void glRasterPos3iv( const GLint *v )
       void glRasterPos3sv( const GLshort *v )
       void glRasterPos4dv( const GLdouble *v )
       void glRasterPos4fv( const GLfloat *v )
       void glRasterPos4iv( const GLint *v )
       void glRasterPos4sv( const GLshort *v )

PARAMETERS
       v      Specifies a pointer to an array of two, three, or four elements,
	      specifying $x$, $y$, $z$, and $w$ coordinates, respectively.

DESCRIPTION
       The  GL	maintains a 3D position in window coordinates.	This position,
       called the raster position, is used to position pixel and bitmap	 write
       operations.  It	is  maintained	with subpixel accuracy.	 See glBitmap,
       glDrawPixels, and glCopyPixels.

       The current raster position consists of three window coordinates	 ($x$,
       $y$, $z$), a clip coordinate value ($w$), an eye coordinate distance, a
       valid bit, and associated color data and texture coordinates.  The  $w$
       coordinate is a clip coordinate, because $w$ is not projected to window
       coordinates.  glRasterPos4 specifies object coordinates $x$, $y$,  $z$,
       and $w$ explicitly.  glRasterPos3 specifies object coordinate $x$, $y$,
       and $z$ explicitly, while $w$ is implicitly  set	 to  1.	  glRasterPos2
       uses  the  argument values for $x$ and $y$ while implicitly setting $z$
       and $w$ to 0 and 1.

       The object coordinates presented by glRasterPos are treated  just  like
       those  of  a glVertex command: They are transformed by the current mod‐
       elview and projection matrices and passed to the	 clipping  stage.   If
       the  vertex  is	not  culled, then it is projected and scaled to window
       coordinates, which become the new  current  raster  position,  and  the
       GL_CURRENT_RASTER_POSITION_VALID flag is set.  If the vertex is culled,
       then the valid bit is cleared and the current raster position and asso‐
       ciated color and texture coordinates are undefined.

       The  current  raster  position also includes some associated color data
       and   texture   coordinates.    If   lighting	is    enabled,	  then
       GL_CURRENT_RASTER_COLOR	(in  RGBA mode) or GL_CURRENT_RASTER_INDEX (in
       color index mode) is set to the color produced by the lighting calcula‐
       tion (see glLight, glLightModel, and
       glShadeModel).	If  lighting is disabled, current color (in RGBA mode,
       state variable GL_CURRENT_COLOR) or color index (in color  index	 mode,
       state  variable	GL_CURRENT_INDEX) is used to update the current raster
       color.

       Likewise, GL_CURRENT_RASTER_TEXTURE_COORDS is updated as a function  of
       GL_CURRENT_TEXTURE_COORDS,  based on the texture matrix and the texture
       generation functions (see glTexGen).  Finally, the  distance  from  the
       origin  of  the	eye  coordinate system to the vertex as transformed by
       only the modelview matrix replaces GL_CURRENT_RASTER_DISTANCE.

       Initially, the current raster position is (0, 0,	 0,  1),  the  current
       raster  distance	 is 0, the valid bit is set, the associated RGBA color
       is (1, 1, 1, 1), the associated color index is 1,  and  the  associated
       texture	  coordinates	are   (0,   0,	 0,   1).    In	  RGBA	 mode,
       GL_CURRENT_RASTER_INDEX is always 1; in color index mode,  the  current
       raster RGBA color always maintains its initial value.

NOTES
       The raster position is modified both by glRasterPos and by glBitmap.

       When the raster position coordinates are invalid, drawing commands that
       are based on the raster position are ignored  (that  is,	 they  do  not
       result in changes to GL state).

       Calling	glDrawElements,	 or  glDrawRangeElements may leave the current
       color or index indeterminate.  If glRasterPos  is  executed  while  the
       current	color  or  index is indeterminate, the current raster color or
       current raster index remains indeterminate.

       To set a valid raster position outside the viewport, first set a	 valid
       raster position, then call glBitmap with NULL as the bitmap parameter.

       When  the  GL_ARB_imaging  extension  is	 supported, there are distinct
       raster texture coordinates for each texture unit. Each  texture	unit's
       current raster texture coordinates are updated by glRasterPos.

ERRORS
       GL_INVALID_OPERATION  is	 generated  if glRasterPos is executed between
       the execution of glBegin and the corresponding execution of glEnd.

ASSOCIATED GETS
       glGet with argument GL_CURRENT_RASTER_POSITION
       glGet with argument GL_CURRENT_RASTER_POSITION_VALID
       glGet with argument GL_CURRENT_RASTER_DISTANCE
       glGet with argument GL_CURRENT_RASTER_COLOR
       glGet with argument GL_CURRENT_RASTER_INDEX
       glGet with argument GL_CURRENT_RASTER_TEXTURE_COORDS

SEE ALSO
       glBitmap(3G), glCopyPixels(3G),	glDrawArrays(3G),  glDrawElements(3G),
       glDrawRangeElements(3G),	       glDrawPixels(3G),       glTexCoord(3G),
       glTexGen(3G), glVertex(3G)

							       GLRASTERPOS(3G)
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