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GLRASTERPOS(3G)			 OpenGL Manual		       GLRASTERPOS(3G)

NAME
       glRasterPos - specify the raster position for pixel operations

C SPECIFICATION
       void glRasterPos2s(GLshort x, GLshort y);

       void glRasterPos2i(GLint x, GLint y);

       void glRasterPos2f(GLfloat x, GLfloat y);

       void glRasterPos2d(GLdouble x, GLdouble y);

       void glRasterPos3s(GLshort x, GLshort y, GLshort z);

       void glRasterPos3i(GLint x, GLint y, GLint z);

       void glRasterPos3f(GLfloat x, GLfloat y, GLfloat z);

       void glRasterPos3d(GLdouble x, GLdouble y, GLdouble z);

       void glRasterPos4s(GLshort x, GLshort y, GLshort z, GLshort w);

       void glRasterPos4i(GLint x, GLint y, GLint z, GLint w);

       void glRasterPos4f(GLfloat x, GLfloat y, GLfloat z, GLfloat w);

       void glRasterPos4d(GLdouble x, GLdouble y, GLdouble z, GLdouble w);

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

C SPECIFICATION
       void glRasterPos2sv(const GLshort * v);

       void glRasterPos2iv(const GLint * v);

       void glRasterPos2fv(const GLfloat * v);

       void glRasterPos2dv(const GLdouble * v);

       void glRasterPos3sv(const GLshort * v);

       void glRasterPos3iv(const GLint * v);

       void glRasterPos3fv(const GLfloat * v);

       void glRasterPos3dv(const GLdouble * v);

       void glRasterPos4sv(const GLshort * v);

       void glRasterPos4iv(const GLint * v);

       void glRasterPos4fv(const GLfloat * v);

       void glRasterPos4dv(const GLdouble * 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
       modelview 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
       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_CURRENT_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.
       GL_CURRENT_RASTER_SECONDARY_COLOR (in RGBA mode) is likewise updated.

       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 by glRasterPos, glBitmap(), and
       glWindowPos().

       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 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_SECONDARY_COLOR

       glGet() with argument GL_CURRENT_RASTER_INDEX

       glGet() with argument GL_CURRENT_RASTER_TEXTURE_COORDS

SEE ALSO
       glBitmap(), glCopyPixels(), glDrawArrays(), glDrawElements(),
       glDrawRangeElements(), glDrawPixels(), glMultiTexCoord(), glTexCoord(),
       glTexGen(), glVertex(), glWindowPos()

COPYRIGHT
       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
       under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org			  03/16/2013		       GLRASTERPOS(3G)

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