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glTexSubImage3DEXT(3G)	       OpenGL Reference		glTexSubImage3DEXT(3G)


NAME    [Toc]    [Back]

     glTexSubImage3DEXT	- specify a three-dimensional texture subimage

C SPECIFICATION    [Toc]    [Back]

     void glTexSubImage3DEXT( GLenum target,
			      GLint level,
			      GLint xoffset,
			      GLint yoffset,
			      GLint zoffset,
			      GLsizei width,
			      GLsizei height,
			      GLsizei depth,
			      GLenum format,
			      GLenum type,
			      const GLvoid *pixels )

PARAMETERS    [Toc]    [Back]

     target   Specifies	the target texture.  Must be GL_TEXTURE_3D_EXT.

     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.

     yoffset  Specifies	a texel	offset in the y	direction within the texture
	      array.

     zoffset  Specifies	a texel	offset in the z	direction within the texture
	      array.

     width    Specifies	the width of the texture subimage.

     height   Specifies	the height of the texture subimage.

     depth    Specifies	the depth 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_ABGR_EXT, 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,
	      GL_FLOAT,	GL_UNSIGNED_BYTE_3_3_2_EXT,
	      GL_UNSIGNED_SHORT_4_4_4_4_EXT, GL_UNSIGNED_SHORT_5_5_5_1_EXT,
	      GL_UNSIGNED_INT_8_8_8_8_EXT, and GL_UNSIGNED_INT_10_10_10_2_EXT.





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glTexSubImage3DEXT(3G)	       OpenGL Reference		glTexSubImage3DEXT(3G)



     pixels   Specifies	a pointer to the image data in memory.

DESCRIPTION    [Toc]    [Back]

     Texturing maps a portion of a specified texture image onto	each graphical
     primitive for which texturing is enabled.	Three-dimensional texturing is
     enabled and disabled using	glEnable and glDisable with argument
     GL_TEXTURE_3D_EXT.

     glTexSubImage3DEXT	redefines a contiguous subregion of an existing
     three-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, y indices yoffset and yoffset+height-1,
     inclusive (But, see discussion of GL_INTERLACE_SGIX below), and z indices
     zoffset and zoffset+depth-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 zero width,
     height or depth, but such a specification has no effect.

     If	GL_INTERLACE_SGIX is enabled, then every other row of the destination
     texture is	skipped. That is, only rows (0,2,4,...)	of each	S-T slice
     (where the	border is considered part of the slice)	are defined. A
     complete video frame may be assembled in a	slice of the texture array by
     invoking glTexSubImage3DEXT on two	consecutive video fields, with yoffset
     values that differ	by one.

NOTES    [Toc]    [Back]

     Texturing has no effect in	color index mode.

     glPixelStore and glPixelTransfer modes affect texture images in exactly
     the way they affect glDrawPixels.

     glTexSubImage3DEXT	is only	available if both the EXT_subtexture and
     EXT_texture3d extensions are supported.

     If	type is	set to GL_UNSIGNED_BYTE_3_3_2_EXT,
     GL_UNSIGNED_SHORT_4_4_4_4_EXT, GL_UNSIGNED_SHORT_5_5_5_1_EXT,
     GL_UNSIGNED_INT_8_8_8_8_EXT, or GL_UNSIGNED_INT_10_10_10_2_EXT and	the
     EXT_packed_pixels extension is not	supported then a GL_INVALID_ENUM error
     is	generated.

     See glIntro for more information on using extensions.

ERRORS    [Toc]    [Back]

     GL_INVALID_ENUM is	generated when target is not GL_TEXTURE_3D_EXT.

     GL_INVALID_OPERATION is generated when the	texture	array has not been
     defined by	a previous glTexImage3D	operation.

     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_3D_TEXTURE_SIZE_EXT.
	2




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glTexSubImage3DEXT(3G)	       OpenGL Reference		glTexSubImage3DEXT(3G)



     GL_INVALID_VALUE is generated if xoffset<-TEXTURE_BORDER,
     (xoffset+width)>(TEXTURE_WIDTH-TEXTURE_BORDER), yoffset<-TEXTURE_BORDER,
     (yoffset+interlacexheight)>(TEXTURE_HEIGHT-TEXTURE_BORDER),
     zoffset<-TEXTURE_BORDER, or (zoffset+depth)>(TEXTURE_DEPTH_EXTTEXTURE_BORDER),
 where TEXTURE_WIDTH, TEXTURE_HEIGHT, TEXTURE_DEPTH_EXT
     and TEXTURE_BORDER	are the	state values of	the texture image being
     modified, and interlace is	1 if GL_INTERLACE_SGIX is disabled and 2
     otherwise.	 Note that TEXTURE_WIDTH, TEXTURE_HEIGHT and TEXTURE_DEPTH_EXT
     include twice the border width.

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

     GL_INVALID_ENUM is	generated when 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 glTexSubImage3DEXT is	executed
     between the execution of glBegin and the corresponding execution of
     glEnd.

ASSOCIATED GETS    [Toc]    [Back]

     glGetTexImage
     glIsEnabled with argument GL_TEXTURE_3D_EXT


MACHINE	DEPENDENCIES
     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.

     The SGIX_interlace	extension is supported only on InfiniteReality
     systems, on RealityEngine,	RealityEngine2,	and VTX	systems, on Octane2
     VPro systems, and on O2 systems.

     The EXT_packed_pixels extension is	not supported on RealityEngine,
     RealityEngine2, and VTX systems.

     glTexSubImage3DEXT	is not supported on RealityEngine, RealityEngine2, and
     VTX systems.

     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.






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glTexSubImage3DEXT(3G)	       OpenGL Reference		glTexSubImage3DEXT(3G)


SEE ALSO    [Toc]    [Back]

      
      
     glDrawPixels, glFog, glPixelStore,	glPixelTransfer, glTexEnv, glTexGen,
     glTexImage3D, glTexParameter.


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