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glCopyTexSubImage3DEXT(3G)     OpenGL Reference	    glCopyTexSubImage3DEXT(3G)


NAME    [Toc]    [Back]

     glCopyTexSubImage3DEXT - copy pixels into a 3D texture subimage

C SPECIFICATION    [Toc]    [Back]

     void glCopyTexSubImage3DEXT( GLenum target,
				  GLint	level,
				  GLint	xoffset,
				  GLint	yoffset,
				  GLint	zoffset,
				  GLint	x,
				  GLint	y,
				  GLsizei width,
				  GLsizei height )

PARAMETERS    [Toc]    [Back]

     target   The target texture.  Must	be GL_TEXTURE_3D_EXT

     level    The level-of-detail number.  Level 0 is the base image level.
	      Level n is the nth mipmap	reduction image.

     xoffset  A	texel offset in	the x direction	within the texture array.

     yoffset  A	texel offset in	the y direction	within the texture array.

     zoffset  A	texel offset in	the z direction	within the texture array.

     x	      The x coordinate of the lower-left corner	of the pixel rectangle
	      to be transferred	to the texture array.

     y	      The y coordinate of the lower-left corner	of the pixel rectangle
	      to be transferred	to the texture array.

     width    The width	of the texture subimage.

     height   The height of the	texture	subimage.

DESCRIPTION    [Toc]    [Back]

     glCopyTexSubImage3DEXT replaces a rectangular portion of a	threedimensional
 texture image with pixels from	the current GL_READ_BUFFER
     (rather than from main memory, as is the case for glTexSubImage3DEXT).

     The screen-aligned	pixel rectangle	with lower-left	corner at (x, y)
     having width width	and height height replaces the rectangular area	of the
     S-T slice located at zoffset with	x indices xoffset through
     xoffset+width-1, inclusive, and y indices yoffset through
     yoffset+height-1, inclusive (But, see discussion of GL_INTERLACE_SGIX
     below).






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glCopyTexSubImage3DEXT(3G)     OpenGL Reference	    glCopyTexSubImage3DEXT(3G)



     The destination rectangle in the texture array may	not include any	texels
     outside the texture array as it was originally specified.	It is not an
     error to specify a	subtexture with	zero width or height, but such a
     specification has no effect.

     When GL_INTERLACE_READ_INGR is enabled, every other row of	the source
     pixel rectangle is	read.  The height of the source	pixel rectangle	is
     equivalent	to 2xheight.  Only rows	(y+0,y+2,...) of the source are	used
     to	define the rows	of the texture subimage	that are affected by the copy.

     When GL_INTERLACE_SGIX is enabled,	every other row	of the texture
     subimage is defined.  The height of the texture subimage is equivalent to
     2xheight.	Only rows (yoffset+0,yoffset+2,...) of the S-T slice (where
     the border	is considered part of the slice) are modified. A complete
     video frame may be	assembled in a slice of	the texture array by invoking
     glCopyTexSubImage3DEXT on two consecutive video fields, with yoffset
     values that differ	by one.

     The pixels	in the rectangle are processed exactly as if glCopyPixels had
     been called, but the process stops	just before final conversion.  At this
     point all pixel component values are clamped to the range [0, 1] and then
     converted to the texture's	internal format	for storage in the texel
     array.

     If	any of the pixels within the specified rectangle of the	current
     GL_READ_BUFFER are	outside	the read window	associated with	the current
     rendering context,	then the values	obtained for those pixels are
     undefined.

NOTES    [Toc]    [Back]

     glCopyTexSubImage3DEXT is part of the EXT_copy_texture extension.	See
     glIntro for more information about	using extensions.

ERRORS    [Toc]    [Back]

     GL_INVALID_ENUM is	generated when target is not one of the	allowable
     values.

     GL_INVALID_VALUE is generated if level is less than zero or greater than
     log (max),	where max is the returned value	of GL_MAX_TEXTURE_SIZE.
	2

     GL_INVALID_VALUE is generated if xoffset<-TEXTURE_BORDER,
     (xoffset+width)>(TEXTURE_WIDTH-TEXTURE_BORDER), yoffset<-TEXTURE_BORDER,
     (yoffset+interlacexheight)>(TEXTURE_HEIGHT-TEXTURE_BORDER), or if
     zoffset<-TEXTURE_BORDER.  Where TEXTURE_WIDTH, TEXTURE_HEIGHT, and
     TEXTURE_BORDER are	the state values of the	texture	image being modified,
     and interlace is 1	if GL_INTERLACE_SGIX is	disabled and 2 otherwise.
     Note that TEXTURE_WIDTH and TEXTURE_HEIGHT	include	twice the border
     width.

     GL_INVALID_VALUE is generated if width or height is negative.





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glCopyTexSubImage3DEXT(3G)     OpenGL Reference	    glCopyTexSubImage3DEXT(3G)



     GL_INVALID_OPERATION is generated when the	texture	array has not been
     defined by	a previous glTexImage3D	(or equivalent)	operation.

     GL_INVALID_OPERATION is generated if glCopyTexSubImage3DEXT is executed
     between the execution of glBegin and the corresponding execution of
     glEnd.

ASSOCIATED GETS    [Toc]    [Back]

     glGetTexImage


MACHINE	DEPENDENCIES
     glCopyTexSubImage3DEXT is not supported on	RealityEngine, RealityEngine2,
     and VTX systems.

     On	InfiniteReality	systems, there is a performance	benefit	when the width
     of	the image to be	transferred to texture memory is a multiple of 8.

     Texture borders are not supported on InfiniteReality systems.
     Applications should use borderless	textures and GL_CLAMP_TO_EDGE_SGIS
     wrap mode.

     On	High Impact and	Maximum	Impact systems,	if the right side of the image
     to	be transferred to texture memory is not	the right side of the texture,
     then its index must be a multiple of 32, where index = xoffset+width.
     Otherwise it will generate	a GL_INVALID_VALUE error.

     The SGIX_interlace	extension is supported only on InfiniteReality
     systems, on RealityEngine,	RealityEngine2,	and VTX	systems, on Octane2
     VPro systems, and on O2 systems.

     The INGR_interlace_read extension is supported only on Octane2 VPro
     systems, and on O2	systems.

SEE ALSO    [Toc]    [Back]

      
      
     glTexImage3D, glTexSubImage3DEXT, glCopyPixels.


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