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glpolygonstipple(3g) [osx 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 (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)

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GLLINESTIPPLE(3G)														 GLLINESTIPPLE(3G)

NAME
glLineStipple - specify the line stipple pattern C SPECIFICATION
void glLineStipple( GLint factor, GLushort pattern ) 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 segment are generated. The i fragments associated with count s are masked out if pattern bit (s / factor) 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 * width rectangles for purposes of stippling. Whether rectagle 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, glPolygonStipple GLLINESTIPPLE(3G)
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