glcopytexsubimage1d man page on SunOS

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GLCOPYTEXSUBIMAGE1D(3gl)			      GLCOPYTEXSUBIMAGE1D(3gl)

NAME
       glCopyTexSubImage1D - copy a one-dimensional texture subimage

C SPECIFICATION
       void glCopyTexSubImage1D( GLenum target,
				 GLint level,
				 GLint xoffset,
				 GLint x,
				 GLint y,
				 GLsizei width )

PARAMETERS
       target	Specifies the target texture.  Must be GL_TEXTURE_1D.

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

       xoffset	Specifies the texel offset within the texture array.

       x, y	Specify the window coordinates of the left corner of  the  row
		of pixels to be copied.

       width	Specifies the width of the texture subimage.

DESCRIPTION
       glCopyTexSubImage1D  replaces  a	 portion  of a one-dimensional texture
       image with pixels from the current  GL_READ_BUFFER  (rather  than  from
       main memory, as is the case for glTexSubImage1D).

       The  screen-aligned  pixel  row	with  left  corner at (x, y), and with
       length width replaces the portion of the texture array with  x  indices
       xoffset through xoffset+width−1, inclusive. The destination in the tex‐
       ture array may not include any texels outside the texture array	as  it
       was originally specified.

       The pixels in the row 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.

       It  is not an error to specify a subtexture with zero width, but such a
       specification has no effect.  If any of the pixels within the specified
       row  of	the current GL_READ_BUFFER are outside the read window associ‐
       ated with the current rendering context, then the values	 obtained  for
       those pixels are undefined.

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

       If  glCopyTexSubImage1D 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 glTexImage1D and glPixelStore for details.

NOTES
       glCopyTexSubImage1D 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_1D.

       GL_INVALID_OPERATION is generated if the texture	 array	has  not  been
       defined by a previous glTexImage1D or glCopyTexImage1D operation.

       GL_INVALID_VALUE is generated if level is less than 0.

       GL_INVALID_VALUE	 may  be generated if level>log2 max, where max is the
       returned value of GL_MAX_TEXTURE_SIZE.

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

       GL_INVALID_VALUE	 is generated if xoffset<−b, or (xoffset+width)>(w−b),
       where w is the GL_TEXTURE_WIDTH, and b is the GL_TEXTURE_BORDER of  the
       texture	image  being  modified.	 Note that w includes twice the border
       width.

ASSOCIATED GETS
       glGetTexImage
       glIsEnabled with argument GL_TEXTURE_1D

SEE ALSO
       glCopyPixels, glCopyTexImage1D, glCopyTexImage2D,  glCopyTexSubImage2D,
       glPixelStore, glPixelTransfer, glTexEnv, glTexGen, glTexImage1D, glTex‐
       Image2D, glTexParameter, glTexSubImage1D, glTexSubImage2D

				   15 Mar 97	      GLCOPYTEXSUBIMAGE1D(3gl)
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