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GLCOMPRESSEDTEXIMAGE(3G)		  OpenGL Manual 		 GLCOMPRESSEDTEXIMAGE(3G)

NAME
       glCompressedTexImage3D - specify a three-dimensional texture image in a compressed format

C SPECIFICATION
       void glCompressedTexImage3D(GLenum target, GLint level, GLenum internalformat,
				   GLsizei width, GLsizei height, GLsizei depth, GLint border,
				   GLsizei imageSize, const GLvoid * data);

PARAMETERS
       target
	   Specifies the target texture. Must be GL_TEXTURE_3D, GL_PROXY_TEXTURE_3D,
	   GL_TEXTURE_2D_ARRAY or GL_PROXY_TEXTURE_2D_ARRAY.

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

       internalformat
	   Specifies the format of the compressed image data stored at address data.

       width
	   Specifies the width of the texture image. All implementations support 3D texture
	   images that are at least 16 texels wide.

       height
	   Specifies the height of the texture image. All implementations support 3D texture
	   images that are at least 16 texels high.

       depth
	   Specifies the depth of the texture image. All implementations support 3D texture
	   images that are at least 16 texels deep.

       border
	   This value must be 0.

       imageSize
	   Specifies the number of unsigned bytes of image data starting at the address specified
	   by data.

       data
	   Specifies a pointer to the compressed image data in memory.

DESCRIPTION
       Texturing allows elements of an image array to be read by shaders.

       glCompressedTexImage3D loads a previously defined, and retrieved, compressed
       three-dimensional texture image if target is GL_TEXTURE_3D (see glTexImage3D()).

       If target is GL_TEXTURE_2D_ARRAY, data is treated as an array of compressed 2D textures.

       If target is GL_PROXY_TEXTURE_3D or GL_PROXY_TEXTURE_2D_ARRAY, no data is read from data,
       but all of the texture image state is recalculated, checked for consistency, and checked
       against the implementation's capabilities. If the implementation cannot handle a texture
       of the requested texture size, it sets all of the image state to 0, but does not generate
       an error (see glGetError()). To query for an entire mipmap array, use an image array level
       greater than or equal to 1.

       internalformat must be a known compressed image format (such as GL_RGTC) or an
       extension-specified compressed-texture format. When a texture is loaded with
       glTexImage2D() using a generic compressed texture format (e.g., GL_COMPRESSED_RGB), the GL
       selects from one of its extensions supporting compressed textures. In order to load the
       compressed texture image using glCompressedTexImage3D, query the compressed texture
       image's size and format using glGetTexLevelParameter().

       If a non-zero named buffer object is bound to the GL_PIXEL_UNPACK_BUFFER target (see
       glBindBuffer()) while a texture image is specified, data is treated as a byte offset into
       the buffer object's data store.

       If the compressed data are arranged into fixed-size blocks of texels, the pixel storage
       modes can be used to select a sub-rectangle from a larger containing rectangle. These
       pixel storage modes operate in the same way as they do for glTexImage1D(). In the
       following description, denote by bs, bw, bh, and bd, the values of pixel storage modes
       GL_UNPACK_COMPRESSED_BLOCK_SIZE, GL_UNPACK_COMPRESSED_BLOCK_WIDTH,
       GL_UNPACK_COMPRESSED_BLOCK_HEIGHT, and GL_UNPACK_COMPRESSED_BLOCK_DEPTH, respectively.  bs
       is the compressed block size in bytes; bw, bh, and bd are the compressed block width,
       height, and depth in pixels.

       By default the pixel storage modes GL_UNPACK_ROW_LENGTH, GL_UNPACK_SKIP_ROWS,
       GL_UNPACK_SKIP_PIXELS, GL_UNPACK_IMAGE_HEIGHT and GL_UNPACK_SKIP_IMAGES are ignored for
       compressed images. To enable GL_UNPACK_SKIP_PIXELS and GL_UNPACK_ROW_LENGTH, bs and bw
       must both be non-zero. To also enable GL_UNPACK_SKIP_ROWS and GL_UNPACK_IMAGE_HEIGHT, bh
       must be non-zero. To also enable GL_UNPACK_SKIP_IMAGES, bd must be non-zero. All
       parameters must be consistent with the compressed format to produce the desired results.

       When selecting a sub-rectangle from a compressed image:

       o   the value of GL_UNPACK_SKIP_PIXELS must be a multiple of bw;.RE

	   o   the value of GL_UNPACK_SKIP_ROWS must be a multiple of bw;.RE

	       o   the value of GL_UNPACK_SKIP_IMAGES must be a multiple of bw..RE

		   imageSize must be equal to:

		   b s x width b w x height b h x depth b d

ERRORS
       GL_INVALID_ENUM is generated if internalformat is not one of the generic compressed
       internal formats: GL_COMPRESSED_RED, GL_COMPRESSED_RG, GL_COMPRESSED_RGB,
       GL_COMPRESSED_RGBA.  GL_COMPRESSED_SRGB, or GL_COMPRESSED_SRGB_ALPHA.

       GL_INVALID_VALUE is generated if imageSize is not consistent with the format, dimensions,
       and contents of the specified compressed image data.

       GL_INVALID_VALUE is generated if border is not 0.

       GL_INVALID_OPERATION is generated if parameter combinations are not supported by the
       specific compressed internal format as specified in the specific texture compression
       extension.

       GL_INVALID_OPERATION is generated if a non-zero buffer object name is bound to the
       GL_PIXEL_UNPACK_BUFFER target and the buffer object's data store is currently mapped.

       GL_INVALID_OPERATION is generated if a non-zero buffer object name is bound to the
       GL_PIXEL_UNPACK_BUFFER target and the data would be unpacked from the buffer object such
       that the memory reads required would exceed the data store size.

       Undefined results, including abnormal program termination, are generated if data is not
       encoded in a manner consistent with the extension specification defining the internal
       compression format.

ASSOCIATED GETS
       glGetCompressedTexImage()

       glGet() with argument GL_TEXTURE_COMPRESSED

       glGet() with argument GL_PIXEL_UNPACK_BUFFER_BINDING

       glGetTexLevelParameter() with arguments GL_TEXTURE_INTERNAL_FORMAT and
       GL_TEXTURE_COMPRESSED_IMAGE_SIZE

SEE ALSO
       glActiveTexture(), glCompressedTexImage1D(), glCompressedTexImage2D(),
       glCompressedTexSubImage1D(), glCompressedTexSubImage2D(), glCompressedTexSubImage3D(),
       glCopyTexImage1D(), glCopyTexSubImage1D(), glCopyTexSubImage2D(), glCopyTexSubImage3D(),
       glPixelStore(), glTexImage1D(), glTexImage2D(), glTexSubImage1D(), glTexSubImage2D(),
       glTexSubImage3D(), glTexParameter()

COPYRIGHT
       Copyright (C) 1991-2006 Silicon Graphics, Inc.  (C) 2011 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

opengl.org				    06/10/2014			 GLCOMPRESSEDTEXIMAGE(3G)
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