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GLRASTERPOS(3gl)					      GLRASTERPOS(3gl)

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 )

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  coordi‐
       nate is a clip coordinate, because w is not projected to window coordi‐
       nates.  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.

       Unlike  glWindowPos,  the  coordinates  presented  by  glRasterPos  are
       treated just like those of a glVertex command.  They are transformed by
       the current modelview and projection matrices and passed to  the	 clip‐
       ping  stage.   If  the  vertex  is not culled, then it is projected and
       scaled to window coordinates, which become the new current raster posi‐
       tion,  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 associated 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_CUR‐
       RENT_RASTER_COLOR  (in  RGBA mode) or GL_CURRENT_RASTER_INDEX (in color
       index mode) is set to the color produced by  the	 lighting  calculation
       (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_CUR‐
       RENT_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 by glRasterPos, glWindosPos, 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 may leave the current color or index  indetermi‐
       nate.   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.

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, glCopyPixels, glDrawElements, glDrawPixels, glLight, glLight‐
       Model, glShadeModel, glTexCoord, glTexGen, glVertex, glWindowPos

				   15 Mar 97		      GLRASTERPOS(3gl)
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