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GLCOPYTEXSUBIMAGE2D(3gl)			      GLCOPYTEXSUBIMAGE2D(3gl)

NAME
       glCopyTexSubImage2D - copy a two-dimensional texture subimage

C SPECIFICATION
       void glCopyTexSubImage2D( GLenum target,
				 GLint level,
				 GLint xoffset,
				 GLint yoffset,
				 GLint x,
				 GLint y,
				 GLsizei width,
				 GLsizei height )

PARAMETERS
       target	Specifies  the	target texture.	 Must be one of GL_TEXTURE_2D,
		GL_TEXTURE_CUBE_MAP_POSITIVE_X,	     GL_TEXTURE_CUBE_MAP_NEGA‐
		TIVE_X,		GL_TEXTURE_CUBE_MAP_POSITIVE_Y,	       GL_TEX‐
		TURE_CUBE_MAP_NEGATIVE_Y,      GL_TEXTURE_CUBE_MAP_POSITIVE_Z,
		GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, or GL_DETAIL_TEXTURE_2D_SGIS.

       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.

       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
       glCopyTexSubImage2D replaces a rectangular portion of a two-dimensional
       texture image with pixels from the current GL_READ_BUFFER (rather  than
       from main memory, as is the case for glTexSubImage2D).

       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  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  glCopyTexSubImage2D 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 glTexImage2D and glPixelStore for details.

NOTES
       glCopyTexSubImage2D is available only if	 the  GL  version  is  1.1  or
       greater.

       Texturing has no effect in color index mode.

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

ERRORS
       GL_INVALID_ENUM is generated if target is not GL_TEXTURE_2D.

       GL_INVALID_OPERATION is generated if the texture	 array	has  not  been
       defined by a previous glTexImage2D or glCopyTexImage2D operation.

       GL_INVALID_VALUE is generated if level is less than 0.

       GL_INVALID_VALUE	 may  be  generated  if level is greater than log2max,
       where max is the returned value of GL_MAX_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, or (yoffset+height)>(h−b), where w is the GL_TEXTURE_WIDTH,
       h is the	 GL_TEXTURE_HEIGHT, and b is the GL_TEXTURE_BORDER of the tex‐
       ture image being modified.  Note that w and h include twice the	border
       width.

       GL_INVALID_OPERATION  is	 generated  if glCopyTexSubImage2D is executed
       between the execution of glBegin and  the  corresponding	 execution  of
       glEnd.

ASSOCIATED GETS
       glGetTexImage
       glIsEnabled with argument GL_TEXTURE_2D

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

				   15 Mar 97	      GLCOPYTEXSUBIMAGE2D(3gl)
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