81 lines
2.3 KiB
Plaintext
81 lines
2.3 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 gettexenv
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.ds Xs 32087 4 gettexenv.gl
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.TH GLGETTEXENV 3G
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.SH NAME
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.B "glGetTexEnvfv, glGetTexEnviv
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\- return texture environment parameters
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.SH C SPECIFICATION
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void \f3glGetTexEnvfv\fP(
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GLenum \fItarget\fP,
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.nf
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.ta \w'\f3void \fPglGetTexEnvfv( '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 \f3glGetTexEnviv\fP(
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GLenum \fItarget\fP,
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.nf
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.ta \w'\f3void \fPglGetTexEnviv( '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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.SH PARAMETERS
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.TP \w'\f2target\fP\ \ 'u
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\f2target\fP
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Specifies a texture environment.
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Must be \%\f3GL_TEXTURE_ENV\fP.
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.TP
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\f2pname\fP
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Specifies the symbolic name of a texture environment parameter.
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Accepted values are \%\f3GL_TEXTURE_ENV_MODE\fP and \%\f3GL_TEXTURE_ENV_COLOR\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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\%\f3glGetTexEnv\fP returns in \f2params\fP selected values of a texture environment that
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was specified with \%\f3glTexEnv\fP.
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\f2target\fP specifies a texture environment.
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Currently, only one texture environment is defined and supported:
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\%\f3GL_TEXTURE_ENV\fP.
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.P
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\f2pname\fP names a specific texture environment parameter, as follows:
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.TP 10
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\%\f3GL_TEXTURE_ENV_MODE\fP
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\f2params\fP returns the single-valued texture environment mode,
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a symbolic constant. The initial value is \%\f3GL_MODULATE\fP.
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.TP
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\%\f3GL_TEXTURE_ENV_COLOR\fP
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\f2params\fP returns four integer or floating-point values that are the
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texture environment color.
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Integer values,
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when requested,
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are linearly mapped from the internal floating-point representation
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such that 1.0 maps to the most positive representable integer,
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and \-1.0 maps to the most negative representable integer. The initial
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value is (0, 0, 0, 0).
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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, \%\f3glGetTexEnv\fP returns
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the texture environment parameters for the active texture unit.
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.SH ERRORS
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\%\f3GL_INVALID_ENUM\fP is generated if \f2target\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 \%\f3glGetTexEnv\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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\%\f3glTexEnv(3G)\fP
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