132 lines
4.2 KiB
Plaintext
132 lines
4.2 KiB
Plaintext
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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 copytexsu
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.ds Xs 28384 6 copytexsubimage1d.gl
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.TH GLCOPYTEXSUBIMAGE1D 3G
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.SH NAME
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.B "glCopyTexSubImage1D
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\- copy a one-dimensional texture subimage
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.SH C SPECIFICATION
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void \f3glCopyTexSubImage1D\fP(
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GLenum \fItarget\fP,
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.nf
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.ta \w'\f3void \fPglCopyTexSubImage1D( 'u
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GLint \fIlevel\fP,
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GLint \fIxoffset\fP,
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GLint \fIx\fP,
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GLint \fIy\fP,
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GLsizei \fIwidth\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'\fIxoffset\fP\ \ 'u
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\f2target\fP
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Specifies the target texture.
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Must be \%\f3GL_TEXTURE_1D\fP.
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.TP
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\f2level\fP
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Specifies the level-of-detail number.
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Level 0 is the base image level.
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Level \f2n\fP is the \f2n\fPth mipmap reduction image.
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.TP
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\f2xoffset\fP
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Specifies the texel offset within the texture array.
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.TP
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\f2x\fP, \f2y\fP
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Specify the window coordinates of the left corner
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of the row of pixels to be copied.
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.TP
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\f2width\fP
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Specifies the width of the texture subimage.
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.SH DESCRIPTION
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\%\f3glCopyTexSubImage1D\fP replaces a portion of a one-dimensional
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texture image with pixels from the current \%\f3GL_READ_BUFFER\fP (rather
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than from main memory, as is the case for \%\f3glTexSubImage1D\fP).
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.P
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The screen-aligned pixel row with left corner at (\f2x\fP,\ \f2y\fP), and with
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length \f2width\fP replaces the portion of the
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texture array with x indices \f2xoffset\fP through $"xoffset" ~+~ "width" ~-~ 1$,
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inclusive. The destination in the texture array may not
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include any texels outside the texture array as it was
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originally specified.
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.P
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The pixels in the row are processed exactly as if
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\%\f3glCopyPixels\fP had been called, but the process stops just before
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final conversion.
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At this point all pixel component values are clamped to the range [0,\ 1]
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and then converted to the texture's internal for storage in the texel
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array.
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.P
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It is not an error to specify a subtexture with zero width, but
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such a specification has no effect.
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If any of the pixels within the specified row of the current
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\%\f3GL_READ_BUFFER\fP are outside the read window associated with the current
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rendering context, then the values obtained for those pixels are undefined.
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.P
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No change is made to the \f2internalformat\fP, \f2width\fP,
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or \f2border\fP parameters of the specified texture
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array or to texel values outside the specified subregion.
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.SH NOTES
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\%\f3glCopyTexSubImage1D\fP is available only if the GL version is 1.1 or greater.
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.P
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Texturing has no effect in color index mode.
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.P
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\%\f3glPixelStore\fP and \%\f3glPixelTransfer\fP modes affect texture images
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in exactly the way they affect \%\f3glDrawPixels\fP.
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.P
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When the \%\f3GL_ARB_imaging\fP extension is supported, the RGBA components
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copied from the framebuffer may be processed by the imaging pipeline. See
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\%\f3glTexImage1D\fP for specific details.
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.SH ERRORS
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\%\f3GL_INVALID_ENUM\fP is generated if \f2target\fP is not \%\f3GL_TEXTURE_1D\fP.
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.P
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\%\f3GL_INVALID_OPERATION\fP is generated if the texture array has not
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been defined by a previous \%\f3glTexImage1D\fP or \%\f3glCopyTexImage1D\fP operation.
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.P
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\%\f3GL_INVALID_VALUE\fP is generated if \f2level\fP is less than 0.
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.P
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\%\f3GL_INVALID_VALUE\fP may be generated if \f2level\fP$>log sub 2$\f2 max\fP,
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where \f2max\fP is the returned value of \%\f3GL_MAX_TEXTURE_SIZE\fP.
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.P
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\%\f3GL_INVALID_VALUE\fP is generated if \f2y\fP$ ~<~ ~-b$
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or if \f2width\fP$ ~<~ ~-b$, where $b$
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is the border width of the texture array.
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.P
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\%\f3GL_INVALID_VALUE\fP is generated if $"xoffset" ~<~ ~-b$, or
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$("xoffset"~+~"width") ~>~ (w-b)$,
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where $w$ is the \%\f3GL_TEXTURE_WIDTH\fP, and $b$ is the \%\f3GL_TEXTURE_BORDER\fP
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of the texture image being modified.
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Note that $w$ includes twice the border width.
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.P
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.SH ASSOCIATED GETS
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\%\f3glGetTexImage\fP
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.br
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\%\f3glIsEnabled\fP with argument \%\f3GL_TEXTURE_1D\fP
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.SH SEE ALSO
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\%\f3glCopyPixels(3G)\fP,
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\%\f3glCopyTexImage1D(3G)\fP,
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\%\f3glCopyTexImage2D(3G)\fP,
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\%\f3glCopyTexSubImage2D(3G)\fP,
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\%\f3glCopyTexSubImage3D(3G)\fP,
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\%\f3glPixelStore(3G)\fP,
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\%\f3glPixelTransfer(3G)\fP,
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\%\f3glReadBuffer(3G)\fP,
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\%\f3glTexEnv(3G)\fP,
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\%\f3glTexGen(3G)\fP,
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\%\f3glTexImage1D(3G)\fP,
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\%\f3glTexImage2D(3G)\fP,
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\%\f3glTexImage3D(3G)\fP,
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\%\f3glTexParameter(3G)\fP,
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\%\f3glTexSubImage1D(3G)\fP,
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\%\f3glTexSubImage2D(3G)\fP,
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\%\f3glTexSubImage3D(3G)\fP
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