HP b2600 Reference Manual page 83

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 undefined.
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.
Notes
glCopyTexSubImage2D 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
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Associated gets
glGetTexImage
glIsEnabled with argument GL_TEXTURE_2D
See Also
glCopyPixels,
glCopyTexImage1D,
glCopyTexImage2D,
glCopyTexSubImage1D,
glPixelStore,
glPixelTransfer,
glTexEnv,
glTexGen,
glTexImage1D,
glTexImage2D,
Chapter 3
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
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_TEXTURE_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 glEnd.
C
glCopyTexSubImage2D
max, where max
2
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