glTexSubImage1D - specify a two-dimensional texture subimage

glTexSubImage1D
	glTexSubImage1D(target, level, xoffset, width, format, type, pixels) -> None
glTexSubImage1Db
	glTexSubImage1Db(target, level, xoffset, format, type, pixels[] | pixels[][]) -> None
glTexSubImage1Df
	glTexSubImage1Df(target, level, xoffset, format, type, pixels[] | pixels[][]) -> None
glTexSubImage1Di
	glTexSubImage1Di(target, level, xoffset, format, type, pixels[] | pixels[][]) -> None
glTexSubImage1Ds
	glTexSubImage1Ds(target, level, xoffset, format, type, pixels[] | pixels[][]) -> None
glTexSubImage1Dub
	glTexSubImage1Dub(target, level, xoffset, format, type, pixels[] | pixels[][]) -> None
glTexSubImage1Dui
	glTexSubImage1Dui(target, level, xoffset, format, type, pixels[] | pixels[][]) -> None
glTexSubImage1Dus
	glTexSubImage1Dus(target, level, xoffset, format, type, pixels[] | pixels[][]) -> None

void glTexSubImage1D(	GLenum target,
                      GLint level,
                      GLint xoffset,
                      GLsizei	width,
                      GLenum format,
                      GLenum type,
                      const GLvoid *pixels )

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 a texel offset in the x direction within
         the texture array.

width	   Specifies the width of the texture subimage.

format   Specifies the format	of the pixel data.  The
         following symbolic values are accepted:
         GL_COLOR_INDEX, GL_RED, GL_GREEN, GL_BLUE,
         GL_ALPHA, GL_RGB, GL_RGBA, GL_LUMINANCE, and
         GL_LUMINANCE_ALPHA.

type	   Specifies the data type of the pixel	data.  The
         following symbolic values are accepted:
         GL_UNSIGNED_BYTE, GL_BYTE, GL_BITMAP,
         GL_UNSIGNED_SHORT, GL_SHORT,	GL_UNSIGNED_INT,
         GL_INT, and GL_FLOAT.

pixels   Specifies a pointer to the image data in memory.

Texturing maps a portion of a	specified texture image	onto
each graphical primitive for which texturing is enabled.  To
enable or disable one-dimensional texturing, call glEnable
and glDisable	with argument GL_TEXTURE_1D.

glTexSubImage1D redefines a contiguous subregion of an
existing one-dimensional texture image.  The texels
referenced by	pixels replace the portion of the existing
texture array	with x indices xoffset and
xoffset + width - 1, inclusive.  This	region may not include
any texels outside the range of the texture array as it was
originally specified.	 It is not an error to specify a
subtexture with width	of 0, but such a specification has no
effect.

glTexSubImage1D 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.

GL_INVALID_ENUM is generated if target is not	one of the
allowable values.

GL_INVALID_OPERATION is generated if the texture array has
not been defined by a	previous glTexImage1D operation.

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 xoffset <  -b, or if
(xoffset + width) > (w - b).	Where w	is the
GL_TEXTURE_WIDTH, and	b is the width of the
GL_TEXTURE_BORDER of the texture image being modified.  Note
that w includes twice	the border width.

GL_INVALID_VALUE is generated	if width is less than 0.

GL_INVALID_ENUM is generated if format is not	an accepted
format constant.

GL_INVALID_ENUM is generated if type is not a	type constant.

GL_INVALID_ENUM is generated if type is GL_BITMAP and	format
is not GL_COLOR_INDEX.

GL_INVALID_OPERATION is generated if glTexSubImage1D is
executed between the execution of glBegin and	the
corresponding	execution of glEnd.

glGetTexImage
glIsEnabled with argument GL_TEXTURE_1D

glCopyTexImage1D, glCopyTexImage2D, glCopyTexSubImage1D,
glCopyTexSubImage2D, glDrawPixels, glPixelStore,
glPixelTransfer, glTexEnv, glTexGen, glTexImage1D,
glTexImage2D,	glTexParameter,	glTexSubImage2D