06-14-2005
Yes, and each line has equal number of bits, say the pattern starts always after 300 bits in each line and pattern is of 5 bits only
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hi ,
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LEARN ABOUT OSX
glpolygonstipple
GLPOLYGONSTIPPLE(3G) GLPOLYGONSTIPPLE(3G)
NAME
glPolygonStipple - set the polygon stippling pattern
C SPECIFICATION
void glPolygonStipple( const GLubyte *mask )
PARAMETERS
mask Specifies a pointer to a 32x32 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.
mask is a pointer to a 32x32 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 32x32
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.
To enable and disable polygon stippling, call glEnable and glDisable with argument GL_POLYGON_STIPPLE. Polygon stippling is initially dis-
abled. If it's enabled, a rasterized polygon fragment with window coordinates xw and yw is sent to the next stage of the GL if and only if
the (xw mod 32)th bit in the (yw mod 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 glPolygonStipple is executed between the execution of glBegin and the corresponding execution of
glEnd.
ASSOCIATED GETS
glGetPolygonStipple
glIsEnabled with argument GL_POLYGON_STIPPLE
SEE ALSO
glDrawPixels, glLineStipple, glPixelStore, glPixelTransfer
GLPOLYGONSTIPPLE(3G)