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glIndexMask

Chapter 9

232

glIndexMask

glIndexMask: control the writing of individual bits in the color index buffers.

C Speciﬁcation

void glIndexMask(

GLuint mask)

Parameters

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.

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.

Errors

• GL_INVALID_OPERATION is generated if glIndexMask is executed between the

execution of glBegin and the corresponding execution of glEnd.

Associated Gets

glGet with argument GL_INDEX_WRITEMASK

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