glCopyTexImage1DEXT(3G)	       OpenGL Reference	       glCopyTexImage1DEXT(3G)

NAME    [Toc]    [Back]

     glCopyTexImage1DEXT - copy	pixels into a 1D texture image

C SPECIFICATION    [Toc]    [Back]

     void glCopyTexImage1DEXT( GLenum target,
			       GLint level,
			       GLenum internalformat,
			       GLint x,
			       GLint y,
			       GLsizei width,
			       GLint border )

PARAMETERS    [Toc]    [Back]

     target	     The target	texture.  Must be GL_TEXTURE_1D

     level	     The level-of-detail number.  Level	0 is the base image
		     level.  Level n is	the nth	mipmap reduction image.

     internalformat  The internal storage format of the	texture	image.	Must
		     be	one of the following symbolic constants:  GL_ALPHA,
		     GL_ALPHA4_EXT, GL_ALPHA8_EXT, GL_ALPHA12_EXT,
		     GL_ALPHA16_EXT, GL_LUMINANCE, GL_LUMINANCE4_EXT,
		     GL_LUMINANCE8_EXT,	GL_LUMINANCE12_EXT,
		     GL_LUMINANCE16_EXT, GL_LUMINANCE_ALPHA,
		     GL_LUMINANCE4_ALPHA4_EXT, GL_LUMINANCE6_ALPHA2_EXT,
		     GL_LUMINANCE8_ALPHA8_EXT, GL_LUMINANCE12_ALPHA4_EXT,
		     GL_LUMINANCE12_ALPHA12_EXT, GL_LUMINANCE16_ALPHA16_EXT,
		     GL_INTENSITY_EXT, GL_INTENSITY4_EXT, GL_INTENSITY8_EXT,
		     GL_INTENSITY12_EXT, GL_INTENSITY16_EXT, GL_RGB,
		     GL_RGB2_EXT, GL_RGB4_EXT, GL_RGB5_EXT, GL_RGB8_EXT,
		     GL_RGB10_EXT, GL_RGB12_EXT, GL_RGB16_EXT, GL_RGBA,
		     GL_RGBA2_EXT, GL_RGBA4_EXT, GL_RGB5_A1_EXT, GL_RGBA8_EXT,
		     GL_RGB10_A2_EXT, GL_RGBA12_EXT, GL_RGBA16_EXT.  (Note
		     that the values 1,	2, 3, and 4, which are accepted	by
		     glTexImage1D, are not accepted by glCopyTexImage1DEXT.)

     x		     The x coordinate of the lower-left	corner of the pixel
		     rectangle to be transferred to the	texture	array.

     y		     The y coordinate of the lower-left	corner of the pixel
		     rectangle to be transferred to the	texture	array.

     width	     The width of the texture image.

     border	     The border	width of the texture.  Must be 0 or 1.

DESCRIPTION    [Toc]    [Back]

     glCopyTexImage1DEXT defines a one-dimensional texture image with pixels
     from the current GL_READ_BUFFER (rather than from main memory, as is the
     case for glTexImage1D).



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glCopyTexImage1DEXT(3G)	       OpenGL Reference	       glCopyTexImage1DEXT(3G)



     The screen-aligned	pixel rectangle	with lower-left	corner at (x, y)
     having width width+2*border and height 1 is used to define	the texture
     array at the mipmap level specified by level.  The	internal format	of the
     texture array is selected by internalformat.

     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 format	for storage in the texel
     array.

     Pixel ordering is such that lower x screen	coordinates correspond to
     lower i texture coordinates, and lower y screen coordinates correspond to
     lower j texture coordinates.

     If	any of the pixels within the specified rectangle of the	current
     GL_READ_BUFFER are	outside	the window associated with the current
     rendering context,	then the values	obtained for those pixels are
     undefined.

NOTES    [Toc]    [Back]

     glCopyTexImage1DEXT is part of the	EXT_copy_texture extension.  See
     glIntro for more information about	using extensions.

ERRORS    [Toc]    [Back]

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

     GL_INVALID_VALUE is generated if level is less than zero or greater than
     log (max),	where max is the returned value	of GL_MAX_TEXTURE_SIZE.
	2

     GL_INVALID_VALUE is generated if the specified image is too large.

     GL_INVALID_VALUE is generated if width is less than zero, greater than
								    k
     2+GL_MAX_TEXTURE_SIZE, or when width cannot be represented	as 2 +2border
     for some integer k.

     GL_INVALID_VALUE is generated if border is	not 0 or 1.

     GL_INVALID_VALUE is generated if internalformat is	not one	of the
     allowable values.

     GL_INVALID_OPERATION is generated if glCopyTexImage1DEXT is executed
     between the execution of glBegin and the corresponding execution of
     glEnd.

ASSOCIATED GETS    [Toc]    [Back]

     glGetTexImage







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glCopyTexImage1DEXT(3G)	       OpenGL Reference	       glCopyTexImage1DEXT(3G)



MACHINE	DEPENDENCIES
     glCopyTexImage1D and glCopyTexImage1DEXT are not supported	on
     RealityEngine, RealityEngine2, and	VTX systems.

     On	InfiniteReality	systems, there is a performance	benefit	when the width
     of	the image to be	transferred to texture memory is a multiple of 8.

     Texture borders are not supported on InfiniteReality systems.
     Applications should use borderless	textures and GL_CLAMP_TO_EDGE_SGIS
     wrap mode.

SEE ALSO    [Toc]    [Back]

     glTexImage1D, glCopyTexSubImage1DEXT, glCopyPixels.


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