trusty (3) glCopyTexSubImage1D.3G.gz

Provided by: opengl-4-man-doc_1.0~svn22917-1_all bug

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 or width 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 < 0, or xoffset + width > w, where w is the GL_TEXTURE_WIDTH of
       the texture image being modified.


ASSOCIATED GETS
       glGetTexImage()


SEE ALSO
       glCopyTexImage1D(), glCopyTexImage2D(), glCopyTexSubImage2D(), glCopyTexSubImage3D(), glPixelStore(),
       glReadBuffer(), glTexImage1D(), glTexImage2D(), glTexImage3D(), glTexParameter(), glTexSubImage1D(),
       glTexSubImage2D(), glTexSubImage3D()


       Copyright © 1991-2006 Silicon Graphics, Inc. Copyright © 2012-2013 Khronos Group. This document is
       licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.


AUTHORS
       opengl.org