GLint leve )

PARAMETERS
       target  Specifies the target texture.  Must be GL_TEXTURE_3D

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

       _param3 Specifies a texel offset in the x direction within  the  texture
               array.

       _param4 Specifies  a  texel offset in the y direction within the texture
               array.

       _param5 Specifies a texel offset in the z direction within  the  texture
               array.

       _param6, _param7
               Specify  the  window coordinates of the lower left corner of the
               rectangular region of pixels to be copied.

       _param8 Specifies the width of the texture subimage.

       _param9 Specifies the height of the texture subimage.

DESCRIPTION
       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
       (_param6, _param7)  and  with  width _param8 and height _param9 replaces
       the portion  of  the  texture  array  with  x  indices  _param3  through
       _param3+_param8−1,    inclusive,   and   y   indices   _param4   through
       _param4+_param9−1, inclusive, at z index _param5 and at the mipmap level
       specified by leve.

       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.
       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 specific
       details.

ERRORS
       GL_INVALID_ENUM is generated if target is not GL_TEXTURE_3D.

       GL_INVALID_OPERATION is generated if the texture array has not been  de‐
       fined by a previous glTexImage3D or glCopyTexImage3D operation.

       GL_INVALID_VALUE is generated if leve is less than 0.

       GL_INVALID_VALUE may be generated if leve is greater than log2max, where
       max is the returned value of GL_MAX_3D_TEXTURE_SIZE.

       GL_INVALID_VALUE is generated if _param6<−b or if _param7<−b, where b is
       the border width of the texture array.

       GL_INVALID_VALUE is generated if _eqnparam3<−b, (_param3+_param8)>(w−b),
       _param4<−b, (_param4+_param9)>(h−b), _param5<−b, or _param5>(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 be‐
       tween the execution of glBegin and the corresponding execution of glEnd.

ASSOCIATED GETS
       glGetTexImage
       glIsEnabled with argument GL_TEXTURE_3D

SEE ALSO
       glCopyPixels, glCopyTexImage1D,  glCopyTexImage2D,  glCopyTexSubImage1D,
       glCopyTexSubImage2D,    glPixelStore,   glPixelTransfer,   glReadBuffer,
       glTexEnv,   glTexGen,    glTexImage1D,    glTexImage2D,    glTexImage3D,
       glTexParameter, glTexSubImage1D, glTexSubImage2D, glTexSubImage3D

                                                        GLCOPYTEXSUBIMAGE3D(3G)