GLCOPYTEXSUBIMAGE1D(3G) OpenGL Manual GLCOPYTEXSUBIMAGE1D(3G)
glCopyTexSubImage1D - copy a one-dimensional texture subimage
void glCopyTexSubImage1D(GLenum target, GLint level, GLint xoffset, GLint x, GLint y,
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 texture subimage.
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
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.
The glPixelStore() mode affects texture images.
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
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.
glCopyTexImage1D(), glCopyTexImage2D(), glCopyTexSubImage2D(), glCopyTexSubImage3D(),
glPixelStore(), glReadBuffer(), glTexImage1D(), glTexImage2D(), glTexImage3D(),
glTexParameter(), glTexSubImage1D(), glTexSubImage2D(), glTexSubImage3D()
Copyright (C) 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.org 06/10/2014 GLCOPYTEXSUBIMAGE1D(3G)