glCopyTexSubImage3DEXT man page on SunOS

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GLCOPYTEXSUBIMAGE3DEXT(3gl)			   GLCOPYTEXSUBIMAGE3DEXT(3gl)

NAME
       glCopyTexSubImage3DEXT - copy a three-dimensional texture image

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

PARAMETERS
       target	Specifies the target texture.  Must be GL_TEXTURE_3D_EXT.

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

       xoffset	Specifies a texel offset in the x direction within the texture
		array.

       yoffset	Specifies a texel offset in the y direction within the texture
		array.

       zoffset	Specifies a texel offset in the z direction within the texture
		array.

       x, y	Specify the window coordinates of  the	lower  left corner  of
		the  rectangular region of pixels to be copied.

       width	Specifies the width of the texture subimage.

       height	Specifies the height of the texture subimage.

DESCRIPTION
       glCopyTexSubImage3DEXT replaces a rectangular portion of a three-dimen‐
       sional  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) and
       with  width  width and height height replaces the two-dimensional slice
       located at (xoffset, yoffset, zoffset) of the three dimensional texture
       array.  The  texels  replaced  in  the  two-dimensional	slice are at x
       indices xoffset through xoffset	+  width  -  1,	  inclusive,   and   y
       indices	yoffset through yoffset + height - 1, inclusive, at the mipmap
       level specified by level.

       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.

       The destination rectangle in the texture array may not include any tex‐
       els  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.

       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 unde‐
       fined.

       No change is made to  the  internalformat,  width,  height,  or	border
       parameters  of  the  specified texture array or to texel values outside
       the specified subregion.

       If glCopyTexSubImage3DEXT is called on a constant texture, then a  copy
       is  made internally before executing the call. A texture is a "constant
       texture" if at the time of the specification of the texture no copy was
       made internally. See glTexImage3DEXT and glPixelStore for details.

NOTES
       Texturing has no effect in color index mode.

       glPixelStore and glPixelTransfer modes affect texture images in exactly
       the way they affect glDrawPixels. In addition,  the  extension  defines
       two  additional	pixel  store  modes  and  one  additional wrap mode as
       defined in glTexImage3DEXT.

       One additional pixel transfer operation and one additional table lookup
       to texture processing stage is added as specified by glColorTableSGI.

ERRORS
       GL_INVALID_ENUM is generated if target is not GL_TEXTURE_3D_EXT.

       GL_INVALID_OPERATION  is	 generated  if	the texture array has not been
       defined by a previous glTexImage3DEXT.

       GL_INVALID_VALUE is generated if level is less than 0.

       GL_INVALID_VALUE is generated if level is less  than  zero  or  greater
       than  log2max,  where  max  is  the  returned  value  of GL_MAX_3D_TEX‐
       TURE_SIZE_EXT.

       GL_INVALID_VALUE is generated if x <  -b or if y < - b, where b is  the
       border width of the texture array.

       GL_INVALID_VALUE	 is generated if xoffset < - b, (xoffset + width) > (w
       - b), yoffset < - b, or (yoffset + height) > (h - b), or zoffset >=  (d
       -  b) where w is the GL_TEXTURE_WIDTH, h is the GL_TEXTURE_HEIGHT, d is
       the GL_TEXTURE_DEPTH_EXT and b is the GL_TEXTURE_BORDER of the  texture
       image  being  modified.	 Note that w, h and d include twice the border
       width.

       GL_INVALID_OPERATION is generated if  glCopyTexSubImage3D  is  executed
       between	the  execution	of  glBegin and the corresponding execution of
       glEnd.

ASSOCIATED GETS
       glGetTexImage
       glIsEnabled with argument GL_TEXTURE_3D_EXT.

SEE ALSO
       glCopyPixels, glCopyTexImage1D, glCopyTexImage2D,  glCopyTexSubImage1D,
       glPixelStore, glPixelTransfer, glTexEnv, glTexGen, glTexImage1D, glTex‐
       Image2D,	 glTexParameter,  glTexSubImage1D,  glTexSubImage2D,  glTexIm‐
       age3DEXT, glTexSubImage3DEXT

				   15 Mar 97	   GLCOPYTEXSUBIMAGE3DEXT(3gl)
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