glPolygonStipple man page on RedHat
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GLPOLYGONSTIPPLE(3G) OpenGL Manual GLPOLYGONSTIPPLE(3G)
NAME
glPolygonStipple - set the polygon stippling pattern
C SPECIFICATION
void glPolygonStipple(const GLubyte * pattern);
PARAMETERS
pattern
Specifies a pointer to a 32 × 32 stipple pattern that will be
unpacked from memory in the same way that glDrawPixels() unpacks
pixels.
DESCRIPTION
Polygon stippling, like line stippling (see glLineStipple()), masks out
certain fragments produced by rasterization, creating a pattern.
Stippling is independent of polygon antialiasing.
pattern is a pointer to a 32 × 32 stipple pattern that is stored in
memory just like the pixel data supplied to a glDrawPixels() call with
height and width both equal to 32, a pixel format of GL_COLOR_INDEX,
and data type of GL_BITMAP. That is, the stipple pattern is represented
as a 32 × 32 array of 1-bit color indices packed in unsigned bytes.
glPixelStore() parameters like GL_UNPACK_SWAP_BYTES and
GL_UNPACK_LSB_FIRST affect the assembling of the bits into a stipple
pattern. Pixel transfer operations (shift, offset, pixel map) are not
applied to the stipple image, however.
If a non-zero named buffer object is bound to the
GL_PIXEL_UNPACK_BUFFER target (see glBindBuffer()) while a stipple
pattern is specified, pattern is treated as a byte offset into the
buffer object's data store.
To enable and disable polygon stippling, call glEnable() and
glDisable() with argument GL_POLYGON_STIPPLE. Polygon stippling is
initially disabled. If it's enabled, a rasterized polygon fragment with
window coordinates x w and y w is sent to the next stage of the GL if
and only if the (x w % 32)th bit in the (y w % 32)th row of the stipple
pattern is 1 (one). When polygon stippling is disabled, it is as if the
stipple pattern consists of all 1's.
ERRORS
GL_INVALID_OPERATION is generated if a non-zero buffer object name is
bound to the GL_PIXEL_UNPACK_BUFFER target and the buffer object's data
store is currently mapped.
GL_INVALID_OPERATION is generated if a non-zero buffer object name is
bound to the GL_PIXEL_UNPACK_BUFFER target and the data would be
unpacked from the buffer object such that the memory reads required
would exceed the data store size.
GL_INVALID_OPERATION is generated if glPolygonStipple is executed
between the execution of glBegin() and the corresponding execution of
glEnd().
ASSOCIATED GETS
glGetPolygonStipple()
glIsEnabled() with argument GL_POLYGON_STIPPLE
glGet() with argument GL_PIXEL_UNPACK_BUFFER_BINDING
SEE ALSO
glDrawPixels(), glLineStipple(), glPixelStore(), glPixelTransfer()
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 GLPOLYGONSTIPPLE(3G)
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