glCopyTexSubImage1D man page on OpenSuSE

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GLCOPYTEXSUBIMAGE1D(3G)				       GLCOPYTEXSUBIMAGE1D(3G)

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	  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.

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.

       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.

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(3G),      glCopyTexImage1D(3G),	 glCopyTexImage2D(3G),
       glCopyTexSubImage2D(3G),	  glCopyTexSubImage3D(3G),   glPixelStore(3G),
       glPixelTransfer(3G),   glReadBuffer(3G),	  glTexEnv(3G),	 glTexGen(3G),
       glTexImage1D(3G),	  glTexImage2D(3G),	     glTexImage3D(3G),
       glTexParameter(3G),	glTexSubImage1D(3G),	  glTexSubImage2D(3G),
       glTexSubImage3D(3G)

						       GLCOPYTEXSUBIMAGE1D(3G)
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