glCopyTexSubImage1D - copy a one-dimensional texture
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 texture array.
Specify the window coordinates of the left corner of the
row of pixels to be copied. Specifies the width of the
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
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.
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
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
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.
glIsEnabled() with argument GL_TEXTURE_1D
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),
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