fglcopytexsubimage1dext man page on IRIX

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fglCopyTexSubImage1DEXT(3G)    OpenGL Reference	   fglCopyTexSubImage1DEXT(3G)

NAME
     fglCopyTexSubImage1DEXT - copy pixels into a 1D texture subimage

FORTRAN SPECIFICATION
     SUBROUTINE fglCopyTexSubImage1DEXT( INTEGER*4 target,
					 INTEGER*4 level,
					 INTEGER*4 xoffset,
					 INTEGER*4 x,
					 INTEGER*4 y,
					 INTEGER*4 width )

PARAMETERS
     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.

     xoffset  A texel offset in the x direction within the texture array.

     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 pixel rectangle to be transferred to the
	      texture array.

DESCRIPTION
     fglCopyTexSubImage1DEXT replaces a rectangular portion of a two-
     dimensional texture image with pixels from the current GL_READ_BUFFER
     (rather than from main memory, as is the case for fglTexSubImage1DEXT).

     The screen-aligned pixel rectangle with lower-left corner at (x, y),
     width width and height 1 replaces the portion of the texture array with x
     indices xoffset through xoffset+width-1, inclusive. The destination
     rectangle in the texture array may not include any texels outside the
     texture array as it was originally specified.

     The pixels in the rectangle are processed exactly as if fglCopyPixels 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
     rectangle 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.

									Page 1

fglCopyTexSubImage1DEXT(3G)    OpenGL Reference	   fglCopyTexSubImage1DEXT(3G)

NOTES
     fglCopyTexSubImage1DEXT is part of the EXT_copy_texture extension.	 See
     fglIntro for more information about using extensions.

ERRORS
     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 xoffset<-TEXTURE_BORDER, or
     (xoffset+width)>(TEXTURE_WIDTH-TEXTURE_BORDER), where TEXTURE_WIDTH and
     TEXTURE_BORDER are the state values of the texture image being modified.
     Note that TEXTURE_WIDTH includes twice the border width.

     GL_INVALID_VALUE is generated if width is negative.

     GL_INVALID_OPERATION is generated when the texture array has not been
     defined by a previous fglTexImage1D (or equivalent) operation.

     GL_INVALID_OPERATION is generated if fglCopyTexSubImage1DEXT is executed
     between the execution of fglBegin and the corresponding execution of
     fglEnd.

ASSOCIATED GETS
     fglGetTexImage

MACHINE DEPENDENCIES
     fglCopyTexSubImage1D and fglCopyTexSubImage1DEXT 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.

     On High Impact and Maximum Impact systems, if the right side of the image
     to be transferred to texture memory is not the right side of the texture,
     then its index must be a multiple of 32, where index = xoffset+width.
     Otherwise it will generate a GL_INVALID_VALUE error.

SEE ALSO
     fglTexImage1D, fglTexSubImage1DEXT, fglCopyPixels.

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