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Table of Contents
glCopyTexSubImage3D - copy a three-dimensional texture subimage
void glCopyTexSubImage3D( GLenum target,
GLint level,
GLint xoffset,
GLint yoffset,
GLint zoffset,
GLint x,
GLint y,
GLsizei width,
GLsizei height )
eqn not supported
- target
- Specifies the target texture. Must be
GL_TEXTURE_3D
- level
- Specifies the level-of-detail number. Level 0 is the
base image level. Level n is the nth mipmap reduction image.
- xoffset
- Specifies
a texel offset in the x direction within the texture array.
- yoffset
- Specifies
a texel offset in the y direction within the texture array.
- zoffset
- Specifies
a texel offset in the z direction within the texture array.
- x, y
- Specify
the window coordinates of the lower left corner of the rectangular region
of pixels to be copied.
- width
- Specifies the width of the texture subimage.
- height
- Specifies the height of the texture subimage.
glCopyTexSubImage3D
replaces a rectangular portion of a three-dimensional texture image with
pixels from the current GL_READ_BUFFER (rather than from main memory, as
is the case for glTexSubImage3D).
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 z index zoffset and 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 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, depth, or border parameters of the
specified texture array or to texel values outside the specified subregion.
glCopyTexSubImage3D is available only if the GL version is 1.2 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, as if they
were a two-dimensional texture. See glTexImage2D for specific details.
GL_INVALID_ENUM
is generated if target is not GL_TEXTURE_3D.
GL_INVALID_OPERATION is generated
if the texture array has not been defined by a previous glTexImage3D or
glCopyTexImage3D operation.
GL_INVALID_VALUE is generated if level is less
than 0.
GL_INVALID_VALUE may be generated if level is greater than $log
sub 2^max$, where $max$ is the returned value of GL_MAX_3D_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$~<~ ~-b$,
(yoffset$~+~$height)$~>~(h ~-~b)$, zoffset$~<~ ~-b$, or zoffset$~>~(d ~-~b)$,
where $w$ is the GL_TEXTURE_WIDTH, $h$ is the GL_TEXTURE_HEIGHT, $d$
is the GL_TEXTURE_DEPTH, and $b$ is the GL_TEXTURE_BORDER of the texture
image being modified. Note that $w$, $h$, and $d$ include twice the border
width.
GL_INVALID_OPERATION is generated if glCopyTexSubImage3D is executed
between the execution of glBegin and the corresponding execution of glEnd.
glGetTexImage
glIsEnabled with argument GL_TEXTURE_3D
glCopyPixels(3G)
, glCopyTexImage1D(3G)
,
glCopyTexImage2D(3G)
, glCopyTexSubImage1D(3G)
, glCopyTexSubImage2D(3G)
,
glPixelStore(3G)
, glPixelTransfer(3G)
, glReadBuffer(3G)
, glTexEnv(3G)
,
glTexGen(3G)
, glTexImage1D(3G)
, glTexImage2D(3G)
, glTexImage3D(3G)
, glTexParameter(3G)
,
glTexSubImage1D(3G)
, glTexSubImage2D(3G)
, glTexSubImage3D(3G)
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