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GLPOLYGONSTIPPLE() GLPOLYGONSTIPPLE() NAME glPolygonStipple - set the polygon stippling pattern C SPECIFICATION void glPolygonStipple( const GLubyte *mask ) delim $$ PARAMETERS mask Specifies a pointer to a $32 times 32$ 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. 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 format of GL_COLOR_INDEX, and data type of GL_BITMAP. That is, the stipple pattern is repre- sented as a $32 times 32$ array of 1-bit color indices packed in un- signed 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 coor- dinates $x sub w$ and $y sub w$ is sent to the next stage of the GL if and only if the ($x sub w~roman mod~32$)th bit in the ($y sub w~roman mod~32$)th row of the stipple pattern is 1 (one). When polygon stip- pling is disabled, it is as if the stipple pattern consists of all 1's. ERRORS GL_INVALID_OPERATION is generated if glPolygonStipple is executed be- tween 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()
NAME | C SPECIFICATION | PARAMETERS | DESCRIPTION | ERRORS | ASSOCIATED GETS | SEE ALSO
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