glPolygonStipple(3G)glPolygonStipple(3G)NAMEglPolygonStipple - set the polygon stippling pattern
SYNOPSIS
void glPolygonStipple(
const GLubyte *mask );
PARAMETERS
Specifies a pointer to a 32 times 32 stipple pattern that will be
unpacked from memory in the same way that glDrawPixels() unpacks pix‐
els.
DESCRIPTION
Polygon stippling, like line stippling (see glLineStipple()), masks out
certain fragments produced by rasterization, creating a pattern. Stip‐
pling is independent of polygon antialiasing.
mask is a pointer to a 32 times 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 of GL_COLOR_INDEX, and data
type of GL_BITMAP. That is, the stipple pattern is represented as a 32
times 32 array of 1-bit color indices packed in unsigned bytes. glPix‐
elStore() parameters like GL_UNPACK_SWAP_BYTES and GL_UNPACK_LSB_FIRST
affect the assembling of the bits into a stipple pattern. Pixel trans‐
fer operations (shift, offset, pixel map) are not applied to the stip‐
ple image, however.
To enable and disable polygon stippling, call glEnable() and glDis‐
able() 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] mod32)th bit in the (y[w]mod32)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 glPolygonStipple() is executed
between the execution of glBegin() and the corresponding execution of
glEnd().
ASSOCIATED GETSglGetPolygonStipple()glIsEnabled() with argument GL_POLYGON_STIPPLE
SEE ALSOglDrawPixels(3), glLineStipple(3), glPixelStore(3), glPixelTransfer(3)glPolygonStipple(3G)