glCopyTexSubImage2D man page on DigitalUNIX

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glCopyTexSubImage2D(3G)				       glCopyTexSubImage2D(3G)

       glCopyTexSubImage2D - copy a two-dimensional texture subimage

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

       Specifies  the  target  texture.	 Must be GL_TEXTURE_2D.	 Specifies the
       level-of-detail number. Level 0 is the base image level. Level n is the
       nth  mipmap  reduction image.  Specifies a texel offset in the x direc‐
       tion within the texture array.  Specifies  a  texel  offset  in	the  y
       direction  within the texture array.  Specify the window coordinates of
       the lower left corner of the rectangular region of pixels to be copied.
       Specifies  the  width of the texture subimage.  Specifies the height of
       the texture subimage.

       glCopyTexSubImage2D() replaces a rectangular portion  of	 a  two-dimen‐
       sional  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  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‐

       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.

       glCopyTexSubImage2D() 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
       read  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_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 log[2] max,
       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_TEX‐
       TURE_WIDTH,  h is the GL_TEXTURE_HEIGHT, and b is the GL_TEXTURE_BORDER
       of the texture 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

       glIsEnabled() with argument GL_TEXTURE_2D

       glCopyPixels(3),	 glCopyTexImage1D(3),  glCopyTexImage2D(3), glCopyTex‐
       SubImage1D(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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