glCopyTexSubImage3D man page on DigitalUNIX

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glCopyTexSubImage3D(3G)				       glCopyTexSubImage3D(3G)

       glCopyTexSubImage3D - copy a three-dimensional texture subimage

       void glCopyTexSubImage3D(
	       GLenum target,
	       GLint level,
	       GLint xoffset,
	       GLint yoffset,
	       GLint zoffset,
	       GLint x,
	       GLint y,
	       GLsizei width,
	       GLsizei height );

       Specifies  the  target  texture.	 Must  be  GL_TEXTURE_3D Specifies the
       level-of-detail number. Level 0 is the base image level. Level n is the
       nth  mipmap  reduction image.  Specifies a texel offset in the x direc‐
       tion within the texture array.  Specifies  a  texel  offset  in	the  y
       direction  within the texture array.  Specifies a texel offset in the z
       direction within the texture array.  Specify the window coordinates  of
       the lower left corner of the rectangular region of pixels to be copied.
       Specifies the width of the texture subimage.  Specifies the  height  of
       the texture subimage.

       glCopyTexSubImage3D()  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 glTexSubImage3D()).

       The screen-aligned pixel rectangle with lower left corner at (x, y) and
       with width width and height height replaces the portion of the  texture
       array  with x indices xoffset through xoffset+width-1, inclusive, and y
       indices yoffset through yoffset+height-1, inclusive, at z index zoffset
       and 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  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‐

       No  change is made to the internalformat, width, height, depth, or bor‐
       der parameters of the specified texture array or to texel  values  out‐
       side the specified subregion.

       glCopyTexSubImage3D()  is  available  only  if the GL version is 1.2 or

       Texturing has no effect in color index mode.

       glPixelStore() and glPixelTransfer() modes  affect  texture  images  in
       exactly the way they affect glDrawPixels().

       When  the  GL_ARB_imaging  extension  is supported, the RGBA components
       copied from the framebuffer may be processed by the  imaging  pipeline,
       as if they were a two-dimensional texture.  See glTexImage2D() for spe‐
       cific details.

       GL_INVALID_ENUM is generated if target is not GL_TEXTURE_3D.

       GL_INVALID_OPERATION is generated if the texture	 array	has  not  been
       defined by a previous glTexImage3D() or glCopyTexImage3D operation.

       GL_INVALID_VALUE is generated if level is less than 0.

       GL_INVALID_VALUE	 may  be  generated  if	 level is greater than log sub
       2^max, where max is the returned value of GL_MAX_3D_TEXTURE_SIZE.

       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, (yoffset+height)>(h -b), zoffset< -b, or  zoffset>(d  -b),
       where  w	 is the GL_TEXTURE_WIDTH, h is the GL_TEXTURE_HEIGHT, d is the
       GL_TEXTURE_DEPTH, 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

       glIsEnabled() with argument GL_TEXTURE_3D

       glCopyPixels(3),	 glCopyTexImage1D(3),  glCopyTexImage2D(3), glCopyTex‐
       SubImage1D(3), glCopyTexSubImage2D(3),  glPixelStore(3),	 glPixelTrans‐
       fer(3),	glReadBuffer(3),  glTexEnv(3),	glTexGen(3),  glTexImage1D(3),
       glTexImage2D(3),	  glTexImage3D(3),   glTexParameter(3),	   glTexSubIm‐
       age1D(3), glTexSubImage2D(3), glTexSubImage3D(3)


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