glRasterPos2d man page on DigitalUNIX

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glRasterPos(3G)						       glRasterPos(3G)

       glRasterPos,  glRasterPos2d,  glRasterPos2f,  glRasterPos2i,  glRaster‐
       Pos2s,  glRasterPos3d,  glRasterPos3f,  glRasterPos3i,	glRasterPos3s,
       glRasterPos4d,  glRasterPos4f,  glRasterPos4i, glRasterPos4s, glRaster‐
       Pos2dv, glRasterPos2fv, glRasterPos2iv, glRasterPos2sv, glRasterPos3dv,
       glRasterPos3fv,	  glRasterPos3iv,    glRasterPos3sv,   glRasterPos4dv,
       glRasterPos4fv, glRasterPos4iv, glRasterPos4sv  -  specify  the	raster
       position for pixel operations

       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 );

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

       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 );

       Specifies a pointer to an array of two, three, or four elements, speci‐
       fying x, y, z, and w coordinates, respectively.

       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

       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 coordi‐
       nates, which become the new current raster position,  and  the  GL_CUR‐
       RENT_RASTER_POSITION_VALID  option  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_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.

       The   raster   position	is  modified  both  by	glRasterPos()  and  by

       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  cur‐
       rent  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  parame‐

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

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

       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

       glBitmap(3),   glCopyPixels(3),	 glDrawArrays(3),   glDrawElements(3),
       glDrawRangeElements(3),	glDrawPixels(3),  glTexCoord(3),  glTexGen(3),


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