NAME    [Toc]    [Back]

       glCopyTexSubImage1D   -  copy  a  one-dimensional  texture
       subimage

SYNOPSIS    [Toc]    [Back]

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

PARAMETERS    [Toc]    [Back]

       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  texture array.
       Specify the window coordinates of the left corner  of  the
       row  of  pixels  to be copied.  Specifies the width of the
       texture subimage.

DESCRIPTION    [Toc]    [Back]

       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 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 associated 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    [Toc]    [Back]

       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    [Toc]    [Back]

       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 width.

ASSOCIATED GETS    [Toc]    [Back]

       glGetTexImage()
       glIsEnabled() with argument GL_TEXTURE_1D

SEE ALSO    [Toc]    [Back]

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



                                          glCopyTexSubImage1D(3G)