108 lines
2.9 KiB
Plaintext
108 lines
2.9 KiB
Plaintext
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'\" e
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'\"! 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 gettexgen
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.ds Xs 2655 5 gettexgen.gl
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.TH GLGETTEXGEN 3G
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.SH NAME
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.B "glGetTexGendv, glGetTexGenfv, glGetTexGeniv
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\- return texture coordinate generation parameters
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.SH C SPECIFICATION
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void \f3glGetTexGendv\fP(
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GLenum \fIcoord\fP,
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.nf
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.ta \w'\f3void \fPglGetTexGendv( 'u
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GLenum \fIpname\fP,
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GLdouble \fI*params\fP )
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.fi
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void \f3glGetTexGenfv\fP(
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GLenum \fIcoord\fP,
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.nf
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.ta \w'\f3void \fPglGetTexGenfv( 'u
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GLenum \fIpname\fP,
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GLfloat \fI*params\fP )
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.fi
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void \f3glGetTexGeniv\fP(
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GLenum \fIcoord\fP,
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.nf
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.ta \w'\f3void \fPglGetTexGeniv( 'u
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GLenum \fIpname\fP,
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GLint \fI*params\fP )
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.fi
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.EQ
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delim $$
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.EN
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.SH PARAMETERS
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.TP \w'\fIparams\fP\ \ 'u
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\f2coord\fP
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Specifies a texture coordinate.
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Must be
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\%\f3GL_S\fP,
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\%\f3GL_T\fP,
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\%\f3GL_R\fP, or
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\%\f3GL_Q\fP.
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.TP
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\f2pname\fP
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Specifies the symbolic name of the value(s) to be returned.
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Must be either \%\f3GL_TEXTURE_GEN_MODE\fP
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or the name of one of the texture generation plane equations:
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\%\f3GL_OBJECT_PLANE\fP or \%\f3GL_EYE_PLANE\fP.
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.TP
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\f2params\fP
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Returns the requested data.
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.SH DESCRIPTION
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\%\f3glGetTexGen\fP returns in \f2params\fP selected parameters of a texture coordinate
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generation function that was specified using \%\f3glTexGen\fP.
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\f2coord\fP names one of the (\f2s\fP, \f2t\fP, \f2r\fP, \f2q\fP)
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texture coordinates,
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using the symbolic constant
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\%\f3GL_S\fP,
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\%\f3GL_T\fP,
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\%\f3GL_R\fP, or
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\%\f3GL_Q\fP.
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.P
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\f2pname\fP specifies one of three symbolic names:
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.TP 28
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\%\f3GL_TEXTURE_GEN_MODE\fP
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\f2params\fP returns the single-valued texture generation function,
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a symbolic constant. The initial value is \%\f3GL_EYE_LINEAR\fP.
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.TP
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\%\f3GL_OBJECT_PLANE\fP
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\f2params\fP returns the four plane equation coefficients that specify
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object linear-coordinate generation.
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Integer values, when requested,
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are mapped directly from the internal floating-point representation.
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.BP
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.TP
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\%\f3GL_EYE_PLANE\fP
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\f2params\fP returns the four plane equation coefficients that specify
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eye linear-coordinate generation.
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Integer values,
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when requested,
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are mapped directly from the internal floating-point representation.
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The returned values are those maintained in eye coordinates.
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They are not equal to the values specified using \%\f3glTexGen\fP,
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unless the modelview matrix was identity when \%\f3glTexGen\fP was called.
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.SH NOTES
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If an error is generated,
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no change is made to the contents of \f2params\fP.
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.P
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When the \%\f3GL_ARB_multitexture\fP extension is supported, \%\f3glGetTexGen\fP returns
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the texture coordinate generation parameters for the active texture unit.
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.SH ERRORS
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\%\f3GL_INVALID_ENUM\fP is generated if \f2coord\fP or \f2pname\fP is not an
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accepted value.
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.P
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\%\f3GL_INVALID_OPERATION\fP is generated if \%\f3glGetTexGen\fP
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is executed between the execution of \%\f3glBegin\fP
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and the corresponding execution of \%\f3glEnd\fP.
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.SH SEE ALSO
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\%\f3glActiveTextureARB(3G)\fP,
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\%\f3glTexGen(3G)\fP
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