Polygon stippling, like line stippling (see glLineStipple), masks out certain fragments produced by rasterization, creating a pattern. Stippling is independent of polygon antialiasing.
pattern is a pointer to a 32 ร 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 represented as a 32 ร 32 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.
If a non-zero named buffer object is bound to the GL_PIXEL_UNPACK_BUFFER target (see glBindBuffer) while a stipple pattern is specified, pattern is treated as a byte offset into the buffer object's data store.
To enable and disable polygon stippling, call glEnable and glDisable with argument GL_POLYGON_STIPPLE. Polygon stippling is initially disabled. If it's enabled, a rasterized polygon fragment with window coordinates ๐ฑ๐ค and ๐ฒ๐ค is sent to the next stage of the GL if and only if the (๐ฑ๐ค%32)แตสฐ bit in the (๐ฒ๐ค%32)แตสฐ 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.
Parameters
pattern: number
Specifies a pointer to a 32 ร 32 stipple pattern that will be unpacked from memory in the same way that glDrawPixels unpacks pixels.
Polygon stippling, like line stippling (see glLineStipple), masks out certain fragments produced by rasterization, creating a pattern. Stippling is independent of polygon antialiasing.
pattern is a pointer to a 32 ร 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 represented as a 32 ร 32 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.
If a non-zero named buffer object is bound to the GL_PIXEL_UNPACK_BUFFER target (see glBindBuffer) while a stipple pattern is specified, pattern is treated as a byte offset into the buffer object's data store.
To enable and disable polygon stippling, call glEnable and glDisable with argument GL_POLYGON_STIPPLE. Polygon stippling is initially disabled. If it's enabled, a rasterized polygon fragment with window coordinates ๐ฑ๐ค and ๐ฒ๐ค is sent to the next stage of the GL if and only if the (๐ฑ๐ค%32)แตสฐ bit in the (๐ฒ๐ค%32)แตสฐ 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.