glCopyTexSubImage2D - copy a two-dimensional texture
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 direction 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-dimensional 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
The destination rectangle in the texture array may not
include any texels 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 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.
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().
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
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()
GL_INVALID_VALUE is generated if level is less than 0.
GL_INVALID_VALUE may be generated if level is greater than
log 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_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
GL_INVALID_OPERATION is generated if glCopyTexSubImage2D()
is executed between the execution of glBegin() and the
corresponding execution of glEnd().
glIsEnabled() with argument GL_TEXTURE_2D
glCopyPixels(3), glCopyTexImage1D(3), glCopyTexImage2D(3),
glCopyTexSubImage1D(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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