| Extracted from Pike v7.8 release 866 at 2018-02-09.

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GL

# Method GL.glIndexMask()

Method glIndexMask

  `void glIndexMask(int mask)`

Description

  glIndexMask controls the writing of individual bits in the color index buffers. The least significant n bits of mask, where n is the number of bits in a color index buffer, specify a mask. Where a 1 (one) appears in the mask, it's possible to write to the corresponding bit in the color index buffer (or buffers). Where a 0 (zero) appears, the corresponding bit is write-protected.

  This mask is used only in color index mode, and it affects only the buffers currently selected for writing (see glDrawBuffer ). Initially, all bits are enabled for writing.

Parameter `mask`

  Specifies a bit mask to enable and disable the writing of individual bits in the color index buffers. Initially, the mask is all 1's.

Throws

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