glCopyTexSubImage1D man page on DigitalUNIX

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glCopyTexSubImage1D(3G)				       glCopyTexSubImage1D(3G)

       glCopyTexSubImage1D - copy a one-dimensional texture subimage

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

       Specifies  the  target  texture.	 Must be GL_TEXTURE_1D.	 Specifies the
       level-of-detail number. Level 0 is the base image level. Level n is the
       nth mipmap reduction image.  Specifies the texel offset within the tex‐
       ture array.  Specify the window coordinates of the left corner  of  the
       row  of pixels to be copied.  Specifies the width of the texture subim‐

       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  texture 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  for storage in the texel

       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

       glCopyTexSubImage1D() is available only if the GL  version  is  1.1  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.
       See glTexImage1D() for specific details.

       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>log sub 2 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

       glIsEnabled() with argument GL_TEXTURE_1D

       glCopyPixels(3), glCopyTexImage1D(3),  glCopyTexImage2D(3),  glCopyTex‐
       SubImage2D(3),  glCopyTexSubImage3D(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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