glCopyTexSubImage1D man page on Darwin
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GLCOPYTEXSUBIMAGE1D(3G) OpenGL 3.3 GLCOPYTEXSUBIMAGE1D(3G)
NAME
glCopyTexSubImage1D - copy a one-dimensional texture subimage
C SPECIFICATION
void glCopyTexSubImage1D(GLenum target, GLint level, GLint xoffset,
GLint x, GLint y, GLsizei width);
PARAMETERS
target
Specifies the target texture. Must be GL_TEXTURE_1D.
level
Specifies the level-of-detail number. Level 0 is the base image
level. Level n is the nth mipmap reduction image.
xoffset
Specifies the texel offset within the texture array.
x, y
Specify the window coordinates of the left corner of the row of
pixels to be copied.
width
Specifies the width of the texture subimage.
DESCRIPTION
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 originally specified.
The pixels in the row are processed exactly as if glReadPixels() 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 format 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.
NOTES
The glPixelStore() mode affects texture images.
ERRORS
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() operation.
GL_INVALID_VALUE is generated if level is less than 0.
GL_INVALID_VALUE may be generated if level > log 2 max, where max is
the returned value of GL_MAX_TEXTURE_SIZE.
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.
ASSOCIATED GETS
glGetTexImage()
SEE ALSO
glCopyTexImage1D(), glCopyTexImage2D(), glCopyTexSubImage2D(),
glCopyTexSubImage3D(), glPixelStore(), glReadBuffer(), glTexImage1D(),
glTexImage2D(), glTexImage3D(), glTexParameter(), glTexSubImage1D(),
glTexSubImage2D(), glTexSubImage3D()
COPYRIGHT
Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
under the SGI Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.
OpenGL 3.3 03/08/2011 GLCOPYTEXSUBIMAGE1D(3G)
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