gllinestipple(3g) [xfree86 man page]

GLLINESTIPPLE(3G)														 GLLINESTIPPLE(3G)

NAME

       glLineStipple - specify the line stipple pattern

C SPECIFICATION

       void glLineStipple( GLint factor,
			   GLushort pattern )

       delim $$

PARAMETERS

       factor	Specifies  a  multiplier  for  each bit in the line stipple pattern.  If factor is 3, for example, each bit in the pattern is used
		three times before the next bit in the pattern is used.  factor is clamped to the range [1, 256] and defaults to 1.

       pattern	Specifies a 16-bit integer whose bit pattern determines which fragments of a line will be drawn when the line is rasterized.   Bit
		zero is used first; the default pattern is all 1's.

DESCRIPTION

       Line  stippling masks out certain fragments produced by rasterization; those fragments will not be drawn.  The masking is achieved by using
       three parameters: the 16-bit line stipple pattern pattern, the repeat count factor, and an integer stipple counter $s$.

       Counter $s$ is reset to 0 whenever glBegin is called, and before each line segment of a glBegin(GL_LINES)/glEnd sequence is generated.	It
       is incremented after each fragment of a unit width aliased line segment is generated, or after each $i$ fragments of an $i$ width line seg-
       ment are generated.  The $i$ fragments associated with count $s$ are masked out if

						      pattern bit $(s ~/~ "factor") ~roman mod~ 16$

       is 0, otherwise these fragments are sent to the frame buffer.  Bit zero of pattern is the least significant bit.

       Antialiased lines are treated as a sequence of $1 times width$ rectangles for purposes of stippling.  Whether rectangle $s$  is	rasterized
       or not depends on the fragment rule described for aliased lines, counting rectangles rather than groups of fragments.

       To enable and disable line stippling, call glEnable and glDisable with argument GL_LINE_STIPPLE.  When enabled, the line stipple pattern is
       applied as described above.  When disabled, it is as if the pattern were all 1's.  Initially, line stippling is disabled.

ERRORS

       GL_INVALID_OPERATION is generated if glLineStipple is executed between the execution of glBegin and the corresponding execution of glEnd.

ASSOCIATED GETS

       glGet with argument GL_LINE_STIPPLE_PATTERN
       glGet with argument GL_LINE_STIPPLE_REPEAT
       glIsEnabled with argument GL_LINE_STIPPLE

SEE ALSO

       glLineWidth(3G), glPolygonStipple(3G)

																 GLLINESTIPPLE(3G)

Check Out this Related Man Page

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 (xwmod32)th bit in the (ywmod32)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(3G), glLineStipple(3G), glPixelStore(3G), glPixelTransfer(3G)

															      GLPOLYGONSTIPPLE(3G)

Linux and UNIX Man Pages

gllinestipple(3g) [xfree86 man page]

Check Out this Related Man Page