100 lines
2.2 KiB
Plaintext
100 lines
2.2 KiB
Plaintext
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.\" $XFree86$
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'\" te
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'\"! tbl|eqn | mmdoc
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'\"macro stdmacro
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.ds Vn Version 1.2
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.ds Dt 24 September 1999
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.ds Re Release 1.2.1
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.ds Dp Jan 14 18:30
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.ds Dm 01 index.gl
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.ds Xs 37923 4 index.gl
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.TH GLINDEX 3G
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.SH NAME
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.B "glIndexd, glIndexf, glIndexi, glIndexs, glIndexub, glIndexdv, glIndexfv, glIndexiv, glIndexsv, glIndexubv
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\- set the current color index
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.P
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.SH C SPECIFICATION
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void \f3glIndexd\fP(
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GLdouble \fIc\fP )
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.nf
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.fi
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void \f3glIndexf\fP(
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GLfloat \fIc\fP )
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.nf
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.fi
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void \f3glIndexi\fP(
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GLint \fIc\fP )
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.nf
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.fi
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void \f3glIndexs\fP(
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GLshort \fIc\fP )
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.nf
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.fi
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void \f3glIndexub\fP(
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GLubyte c); \fI1.1\fP )
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.nf
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.fi
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.SH PARAMETERS
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.TP \w'\f21.1\fP\ \ 'u
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\f21.1\fP
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Specifies the new value for the current color index.
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.P
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.SH C SPECIFICATION
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void \f3glIndexdv\fP(
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const GLdouble \fI*c\fP )
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.nf
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.fi
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void \f3glIndexfv\fP(
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const GLfloat \fI*c\fP )
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.nf
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.fi
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void \f3glIndexiv\fP(
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const GLint \fI*c\fP )
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.nf
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.fi
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void \f3glIndexsv\fP(
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const GLshort \fI*c\fP )
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.nf
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.fi
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void \f3glIndexubv\fP(
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const GLubyte *c); \fI1.1\fP )
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.nf
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.fi
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.SH PARAMETERS
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.TP
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\f21.1\fP
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Specifies a pointer to a one-element array that contains
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the new value for the current color index.
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.SH DESCRIPTION
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\%\f3glIndex\fP updates the current (single-valued) color index.
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It takes one argument, the new value for the current color index.
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.P
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The current index is stored as a floating-point value.
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Integer values are converted directly to floating-point values,
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with no special mapping.
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The initial value is 1.
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.P
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Index values outside the representable range of the color index buffer
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are not clamped.
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However,
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before an index is dithered (if enabled) and written to the frame buffer,
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it is converted to fixed-point .
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Any bits in the integer portion of the resulting fixed-point value
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that do not correspond to bits in the frame buffer are masked out.
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.SH NOTES
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\%\f3glIndexub\fP and \%\f3glIndexubv\fP are available only if the GL version is
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1.1 or greater.
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.P
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The current index can be updated at any time.
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In particular,
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\%\f3glIndex\fP can be called between a call to \%\f3glBegin\fP and the corresponding
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call to \%\f3glEnd\fP.
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.SH ASSOCIATED GETS
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\%\f3glGet\fP with argument \%\f3GL_CURRENT_INDEX\fP
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.SH SEE ALSO
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\%\f3glColor(3G)\fP,
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\%\f3glIndexPointer(3G)\fP
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