217 lines
6.8 KiB
Plaintext
217 lines
6.8 KiB
Plaintext
'\" 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 texsubima
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.ds Xs 33804 8 texsubimage2d.gl
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.TH GLTEXSUBIMAGE2D 3G
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.SH NAME
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.B "glTexSubImage2D
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\- specify a two-dimensional texture subimage
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.SH C SPECIFICATION
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void \f3glTexSubImage2D\fP(
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GLenum \fItarget\fP,
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.nf
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.ta \w'\f3void \fPglTexSubImage2D( 'u
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GLint \fIlevel\fP,
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GLint \fIxoffset\fP,
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GLint \fIyoffset\fP,
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GLsizei \fIwidth\fP,
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GLsizei \fIheight\fP,
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GLenum \fIformat\fP,
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GLenum \fItype\fP,
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const GLvoid \fI*pixels\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_2D\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 a texel offset in the x direction within the texture array.
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.TP
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\f2yoffset\fP
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Specifies a texel offset in the y direction within the texture array.
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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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.TP
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\f2height\fP
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Specifies the height of the texture subimage.
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.TP
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\f2format\fP
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Specifies the of the pixel data.
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The following symbolic values are accepted:
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\%\f3GL_COLOR_INDEX\fP,
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\%\f3GL_RED\fP,
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\%\f3GL_GREEN\fP,
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\%\f3GL_BLUE\fP,
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\%\f3GL_ALPHA\fP,
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\%\f3GL_RGB\fP,
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\%\f3GL_BGR\fP,
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\%\f3GL_RGBA\fP,
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\%\f3GL_BGRA\fP,
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\%\f3GL_LUMINANCE\fP, and
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\%\f3GL_LUMINANCE_ALPHA\fP.
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.TP
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\f2type\fP
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Specifies the data type of the pixel data.
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The following symbolic values are accepted:
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\%\f3GL_UNSIGNED_BYTE\fP,
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\%\f3GL_BYTE\fP,
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\%\f3GL_BITMAP\fP,
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\%\f3GL_UNSIGNED_SHORT\fP,
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\%\f3GL_SHORT\fP,
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\%\f3GL_UNSIGNED_INT\fP,
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\%\f3GL_INT\fP,
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\%\f3GL_FLOAT\fP,
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\%\f3GL_UNSIGNED_BYTE_3_3_2\fP,
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\%\f3GL_UNSIGNED_BYTE_2_3_3_REV\fP,
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\%\f3GL_UNSIGNED_SHORT_5_6_5\fP,
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\%\f3GL_UNSIGNED_SHORT_5_6_5_REV\fP,
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\%\f3GL_UNSIGNED_SHORT_4_4_4_4\fP,
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\%\f3GL_UNSIGNED_SHORT_4_4_4_4_REV\fP,
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\%\f3GL_UNSIGNED_SHORT_5_5_5_1\fP,
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\%\f3GL_UNSIGNED_SHORT_1_5_5_5_REV\fP,
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\%\f3GL_UNSIGNED_INT_8_8_8_8\fP,
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\%\f3GL_UNSIGNED_INT_8_8_8_8_REV\fP,
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\%\f3GL_UNSIGNED_INT_10_10_10_2\fP, and
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\%\f3GL_UNSIGNED_INT_2_10_10_10_REV\fP.
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.TP
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\f2pixels\fP
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Specifies a pointer to the image data in memory.
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.SH DESCRIPTION
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Texturing maps a portion of a specified texture image
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onto each graphical primitive for which texturing is enabled.
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To enable and disable two-dimensional texturing, call \%\f3glEnable\fP
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and \%\f3glDisable\fP with argument \%\f3GL_TEXTURE_2D\fP.
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.P
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\%\f3glTexSubImage2D\fP redefines a contiguous subregion of an existing two-dimensional
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texture image.
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The texels referenced by \f2pixels\fP replace the portion of the
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existing texture array with x indices \f2xoffset\fP and $"xoffset"~+~"width"~-~1$,
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inclusive,
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and y indices \f2yoffset\fP and $"yoffset"~+~"height"~-~1$, inclusive.
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This region may not include any texels outside the range of the
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texture array as it was originally specified.
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It is not an error to specify a subtexture with zero width or height, but
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such a specification has no effect.
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.SH NOTES
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\%\f3glTexSubImage2D\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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Formats \%\f3GL_BGR\fP, and \%\f3GL_BGRA\fP and types
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\%\f3GL_UNSIGNED_BYTE_3_3_2\fP,
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\%\f3GL_UNSIGNED_BYTE_2_3_3_REV\fP,
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\%\f3GL_UNSIGNED_SHORT_5_6_5\fP,
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\%\f3GL_UNSIGNED_SHORT_5_6_5_REV\fP,
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\%\f3GL_UNSIGNED_SHORT_4_4_4_4\fP,
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\%\f3GL_UNSIGNED_SHORT_4_4_4_4_REV\fP,
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\%\f3GL_UNSIGNED_SHORT_5_5_5_1\fP,
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\%\f3GL_UNSIGNED_SHORT_1_5_5_5_REV\fP,
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\%\f3GL_UNSIGNED_INT_8_8_8_8\fP,
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\%\f3GL_UNSIGNED_INT_8_8_8_8_REV\fP,
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\%\f3GL_UNSIGNED_INT_10_10_10_2\fP, and
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\%\f3GL_UNSIGNED_INT_2_10_10_10_REV\fP are available only if the GL version
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is 1.2 or greater.
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.P
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When the \%\f3GL_ARB_multitexture\fP extension is supported, \%\f3glTexSubImage2D\fP
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specifies a two-dimensional sub texture for the current texture unit,
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specified with \%\f3glActiveTextureARB\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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specified in \f2pixels\fP 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_2D\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 \%\f3glTexImage2D\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 is greater
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than $log sub 2$\f2max\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 $"xoffset" ~<~ ~-b$,
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$("xoffset"~+~"width") ~>~ (w~-~b)$,
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$"yoffset" ~<~ ~-b$, or $("yoffset" ~+~ "height") ~>~ (h~-~b)$,
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where $w$ is the \%\f3GL_TEXTURE_WIDTH\fP,
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$h$ is the \%\f3GL_TEXTURE_HEIGHT\fP, and $b$ is the border width
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of the texture image being modified.
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Note that $w$ and $h$ include twice the border width.
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.P
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\%\f3GL_INVALID_VALUE\fP is generated if \f2width\fP or \f2height\fP is less than 0.
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.P
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\%\f3GL_INVALID_ENUM\fP is generated if \f2format\fP is not an accepted
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constant.
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.P
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\%\f3GL_INVALID_ENUM\fP is generated if \f2type\fP is not a type constant.
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.P
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\%\f3GL_INVALID_ENUM\fP is generated if \f2type\fP is \%\f3GL_BITMAP\fP and
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\f2format\fP is not \%\f3GL_COLOR_INDEX\fP.
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.P
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\%\f3GL_INVALID_OPERATION\fP is generated if \%\f3glTexSubImage2D\fP is executed
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between the execution of \%\f3glBegin\fP and the corresponding
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execution of \%\f3glEnd\fP.
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.P
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\%\f3GL_INVALID_OPERATION\fP is generated if \f2type\fP is one of
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\%\f3GL_UNSIGNED_BYTE_3_3_2\fP,
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\%\f3GL_UNSIGNED_BYTE_2_3_3_REV\fP,
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\%\f3GL_UNSIGNED_SHORT_5_6_5\fP, or
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\%\f3GL_UNSIGNED_SHORT_5_6_5_REV\fP
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and \f2format\fP is not \%\f3GL_RGB\fP.
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.P
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\%\f3GL_INVALID_OPERATION\fP is generated if \f2type\fP is one of
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\%\f3GL_UNSIGNED_SHORT_4_4_4_4\fP,
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\%\f3GL_UNSIGNED_SHORT_4_4_4_4_REV\fP,
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\%\f3GL_UNSIGNED_SHORT_5_5_5_1\fP,
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\%\f3GL_UNSIGNED_SHORT_1_5_5_5_REV\fP,
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\%\f3GL_UNSIGNED_INT_8_8_8_8\fP,
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\%\f3GL_UNSIGNED_INT_8_8_8_8_REV\fP,
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\%\f3GL_UNSIGNED_INT_10_10_10_2\fP, or
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\%\f3GL_UNSIGNED_INT_2_10_10_10_REV\fP
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and \f2format\fP is neither \%\f3GL_RGBA\fP nor \%\f3GL_BGRA\fP.
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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_2D\fP
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.SH SEE ALSO
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\%\f3glActiveTextureARB(3G)\fP,
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\%\f3glCopyTexImage1D(3G)\fP,
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\%\f3glCopyTexImage2D(3G)\fP,
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\%\f3glCopyTexSubImage1D(3G)\fP,
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\%\f3glCopyTexSubImage2D(3G)\fP,
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\%\f3glCopyTexSubImage3D(3G)\fP,
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\%\f3glDrawPixels(3G)\fP,
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\%\f3glPixelStore(3G)\fP,
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\%\f3glPixelTransfer(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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\%\f3glTexSubImage1D(3G)\fP,
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\%\f3glTexSubImage3D(3G)\fP,
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\%\f3glTexParameter(3G)\fP
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