143 lines
4.6 KiB
Plaintext
143 lines
4.6 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 gettexpar
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.ds Xs 10274 6 gettexparameter.gl
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.TH GLGETTEXPARAMETER 3G
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.SH NAME
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.B "glGetTexParameterfv, glGetTexParameteriv
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\- return texture parameter values
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.SH C SPECIFICATION
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void \f3glGetTexParameterfv\fP(
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GLenum \fItarget\fP,
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.nf
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.ta \w'\f3void \fPglGetTexParameterfv( '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 \f3glGetTexParameteriv\fP(
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GLenum \fItarget\fP,
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.nf
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.ta \w'\f3void \fPglGetTexParameteriv( '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'\f2target\fP\ \ 'u
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\f2target\fP
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Specifies the symbolic name of the target texture.
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\%\f3GL_TEXTURE_1D\fP,\%\f3GL_TEXTURE_2D\fP, and \%\f3GL_TEXTURE_3D\fP are accepted.
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.TP
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\f2pname\fP
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Specifies the symbolic name of a texture parameter.
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\%\f3GL_TEXTURE_MAG_FILTER\fP,
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\%\f3GL_TEXTURE_MIN_FILTER\fP,
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\%\f3GL_TEXTURE_MIN_LOD\fP,
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\%\f3GL_TEXTURE_MAX_LOD\fP,
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\%\f3GL_TEXTURE_BASE_LEVEL\fP,
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\%\f3GL_TEXTURE_MAX_LEVEL\fP,
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\%\f3GL_TEXTURE_WRAP_S\fP,
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\%\f3GL_TEXTURE_WRAP_T\fP,
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\%\f3GL_TEXTURE_WRAP_R\fP,
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\%\f3GL_TEXTURE_BORDER_COLOR\fP,
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\%\f3GL_TEXTURE_PRIORITY\fP, and
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\%\f3GL_TEXTURE_RESIDENT\fP are accepted.
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.TP
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\f2params\fP
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Returns the texture parameters.
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.SH DESCRIPTION
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\%\f3glGetTexParameter\fP returns in \f2params\fP the value or values of the texture parameter
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specified as \f2pname\fP.
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\f2target\fP defines the target texture,
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either \%\f3GL_TEXTURE_1D\fP, \%\f3GL_TEXTURE_2D\fP, or \%\f3GL_TEXTURE_3D\fP
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to specify one-, two-, or three-dimensional texturing.
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\f2pname\fP accepts the same symbols as \%\f3glTexParameter\fP,
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with the same interpretations:
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.TP 35
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\%\f3GL_TEXTURE_MAG_FILTER\fP
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Returns the single-valued texture magnification filter,
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a symbolic constant. The initial value is \%\f3GL_LINEAR\fP.
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.TP
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\%\f3GL_TEXTURE_MIN_FILTER\fP
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Returns the single-valued texture minification filter,
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a symbolic constant. The initial value is \%\f3GL_NEAREST_MIPMAP_LINEAR\fP.
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.TP
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\%\f3GL_TEXTURE_MIN_LOD\fP
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Returns the single-valued texture minimum level-of-detail value. The
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initial value is $-1000$.
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.TP
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\%\f3GL_TEXTURE_MAX_LOD\fP
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Returns the single-valued texture maximum level-of-detail value. The
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initial value is 1000.
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.TP
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\%\f3GL_TEXTURE_BASE_LEVEL\fP
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Returns the single-valued base texture mipmap level. The initial value is 0.
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.TP
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\%\f3GL_TEXTURE_MAX_LEVEL\fP
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Returns the single-valued maximum texture mipmap array level. The initial
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value is 1000.
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.TP
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\%\f3GL_TEXTURE_WRAP_S\fP
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Returns the single-valued wrapping function for texture coordinate $s$,
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a symbolic constant. The initial value is \%\f3GL_REPEAT\fP.
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.TP
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\%\f3GL_TEXTURE_WRAP_T\fP
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Returns the single-valued wrapping function for texture coordinate $t$,
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a symbolic constant. The initial value is \%\f3GL_REPEAT\fP.
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.TP
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\%\f3GL_TEXTURE_WRAP_R\fP
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Returns the single-valued wrapping function for texture coordinate $r$,
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a symbolic constant. The initial value is \%\f3GL_REPEAT\fP.
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.BP
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.TP
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\%\f3GL_TEXTURE_BORDER_COLOR\fP
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Returns four integer or floating-point numbers that comprise the RGBA color
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of the texture border.
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Floating-point values are returned in the range [0, 1].
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Integer values are returned as a linear mapping of the internal floating-point
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representation such that 1.0 maps to the most positive representable
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integer and \-1.0 maps to the most negative representable
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integer. The initial value is (0, 0, 0, 0).
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.TP
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\%\f3GL_TEXTURE_PRIORITY\fP
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Returns the residence priority of the target texture (or the named
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texture bound to it). The initial value is 1.
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See \%\f3glPrioritizeTextures\fP.
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.TP
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\%\f3GL_TEXTURE_RESIDENT\fP
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Returns the residence status of the target texture.
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If the value returned in \f2params\fP is \%\f3GL_TRUE\fP, the texture is
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resident in texture memory.
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See \%\f3glAreTexturesResident\fP.
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.SH NOTES
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\%\f3GL_TEXTURE_PRIORITY\fP and \%\f3GL_TEXTURE_RESIDENT\fP are
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available only if the GL version is 1.1 or greater.
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.P
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\%\f3GL_TEXTURE_3D\fP,
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\%\f3GL_TEXTURE_MIN_LOD\fP, \%\f3GL_TEXTURE_MAX_LOD\fP, \%\f3GL_TEXTURE_BASE_LEVEL\fP,
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\%\f3GL_TEXTURE_MAX_LEVEL\fP, and \%\f3GL_TEXTURE_WRAP_R\fP are available only
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if the GL version is 1.2 or greater.
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.P
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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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.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 \%\f3glGetTexParameter\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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\%\f3glAreTexturesResident(3G)\fP,
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\%\f3glPrioritizeTextures(3G)\fP,
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\%\f3glTexParameter(3G)\fP
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