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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 (C) 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				    06/10/2014				  GLRASTERPOS(3G)
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