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GLCOMPRESSEDTEXSUBIM(3G)	 OpenGL Manual	      GLCOMPRESSEDTEXSUBIM(3G)

NAME
       glCompressedTexSubImage2D - specify a two-dimensional texture subimage
       in a compressed format

C SPECIFICATION
       void glCompressedTexSubImage2D(GLenum target, GLint level,
				      GLint xoffset, GLint yoffset,
				      GLsizei width, GLsizei height,
				      GLenum format, GLsizei imageSize,
				      const GLvoid * data);

PARAMETERS
       target
	   Specifies the target texture. Must be GL_TEXTURE_2D,
	   GL_TEXTURE_CUBE_MAP_POSITIVE_X, GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
	   GL_TEXTURE_CUBE_MAP_POSITIVE_Y, GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
	   GL_TEXTURE_CUBE_MAP_POSITIVE_Z, or GL_TEXTURE_CUBE_MAP_NEGATIVE_Z.

       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.

       width
	   Specifies the width of the texture subimage.

       height
	   Specifies the height of the texture subimage.

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

       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.

       glCompressedTexSubImage2D redefines a contiguous subregion of an
       existing two-dimensional texture image. The texels referenced by data
       replace the portion of the existing texture array with x indices
       xoffset and xoffset + width - 1, and the y indices yoffset and yoffset
       + height - 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.

       internalformat must be a known compressed image format (such as
       GL_RGTC) or an extension-specified compressed-texture format. The
       format of the compressed texture image is selected by the GL
       implementation that compressed it (see glTexImage2D()) and should be
       queried at the time the texture was compressed with
       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.

ERRORS
       GL_INVALID_ENUM is generated if internalformat is 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_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(),
       glCompressedTexImage3D(), glCompressedTexSubImage1D(),
       glCompressedTexSubImage3D(), glCopyTexImage1D(), glCopyTexImage2D(),
       glCopyTexSubImage1D(), glCopyTexSubImage2D(), glCopyTexSubImage3D(),
       glPixelStore(), glTexImage2D(), glTexImage3D(), glTexSubImage1D(),
       glTexSubImage2D(), glTexSubImage3D(), glTexParameter()

COPYRIGHT
       Copyright © 1991-2006 Silicon Graphics, Inc. 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			  04/29/2014	      GLCOMPRESSEDTEXSUBIM(3G)

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