glTexSubImage2D man page on Oracle

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GLTEXSUBIMAGE2D(3G)		 OpenGL Manual		   GLTEXSUBIMAGE2D(3G)

NAME
       glTexSubImage2D - specify a two-dimensional texture subimage

C SPECIFICATION
       void glTexSubImage2D(GLenum target, GLint level, GLint xoffset,
			    GLint yoffset, GLsizei width, GLsizei height,
			    GLenum format, GLenum type, 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, GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, or
	   GL_TEXTURE_1D_ARRAY.

       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 pixel data. The following symbolic
	   values are accepted: GL_RED, GL_RG, GL_RGB, GL_BGR, GL_RGBA, and
	   GL_BGRA.

       type
	   Specifies the data type of the pixel data. The following symbolic
	   values are accepted: GL_UNSIGNED_BYTE, GL_BYTE, GL_UNSIGNED_SHORT,
	   GL_SHORT, GL_UNSIGNED_INT, GL_INT, GL_FLOAT,
	   GL_UNSIGNED_BYTE_3_3_2, GL_UNSIGNED_BYTE_2_3_3_REV,
	   GL_UNSIGNED_SHORT_5_6_5, GL_UNSIGNED_SHORT_5_6_5_REV,
	   GL_UNSIGNED_SHORT_4_4_4_4, GL_UNSIGNED_SHORT_4_4_4_4_REV,
	   GL_UNSIGNED_SHORT_5_5_5_1, GL_UNSIGNED_SHORT_1_5_5_5_REV,
	   GL_UNSIGNED_INT_8_8_8_8, GL_UNSIGNED_INT_8_8_8_8_REV,
	   GL_UNSIGNED_INT_10_10_10_2, and GL_UNSIGNED_INT_2_10_10_10_REV.

       data
	   Specifies a pointer to the image data in memory.

DESCRIPTION
       Texturing maps a portion of a specified texture image onto each
       graphical primitive for which texturing is enabled.

       glTexSubImage2D redefines a contiguous subregion of an existing
       two-dimensional or one-dimensional arary texture image. The texels
       referenced by data replace the portion of the existing texture array
       with x indices xoffset and xoffset + width - 1, inclusive, and 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
       zero width or height, but such a specification has no effect.

       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.

NOTES
       glPixelStore() modes affect texture images.

       glTexSubImage2D specifies a two-dimensional subtexture for the current
       texture unit, specified with glActiveTexture().

ERRORS
       GL_INVALID_ENUM is generated if target is not 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, GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, or
       GL_TEXTURE_1D_ARRAY.

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

       GL_INVALID_ENUM is generated if type is not a type constant.

       GL_INVALID_VALUE is generated if level is less than 0.

       GL_INVALID_VALUE may be generated if level is greater than log 2max,
       where max is the returned value of GL_MAX_TEXTURE_SIZE.

       GL_INVALID_VALUE is generated if xoffset < - b, xoffset + width > w -
       b, yoffset < - b, or yoffset + height > h - b, where w is the
       GL_TEXTURE_WIDTH, h is the GL_TEXTURE_HEIGHT, and b is the border width
       of the texture image being modified. Note that w and h include twice
       the border width.

       GL_INVALID_VALUE is generated if width or height is less than 0.

       GL_INVALID_OPERATION is generated if the texture array has not been
       defined by a previous glTexImage2D() operation.

       GL_INVALID_OPERATION is generated if type is one of
       GL_UNSIGNED_BYTE_3_3_2, GL_UNSIGNED_BYTE_2_3_3_REV,
       GL_UNSIGNED_SHORT_5_6_5, or GL_UNSIGNED_SHORT_5_6_5_REV and format is
       not GL_RGB.

       GL_INVALID_OPERATION is generated if type is one of
       GL_UNSIGNED_SHORT_4_4_4_4, GL_UNSIGNED_SHORT_4_4_4_4_REV,
       GL_UNSIGNED_SHORT_5_5_5_1, GL_UNSIGNED_SHORT_1_5_5_5_REV,
       GL_UNSIGNED_INT_8_8_8_8, GL_UNSIGNED_INT_8_8_8_8_REV,
       GL_UNSIGNED_INT_10_10_10_2, or GL_UNSIGNED_INT_2_10_10_10_REV and
       format is neither GL_RGBA nor GL_BGRA.

       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.

       GL_INVALID_OPERATION is generated if a non-zero buffer object name is
       bound to the GL_PIXEL_UNPACK_BUFFER target and data is not evenly
       divisible into the number of bytes needed to store in memory a datum
       indicated by type.

ASSOCIATED GETS
       glGetTexImage()

       glGet() with argument GL_PIXEL_UNPACK_BUFFER_BINDING

SEE ALSO
       glActiveTexture(), glCopyTexImage1D(), glCopyTexImage2D(),
       glCopyTexSubImage1D(), glCopyTexSubImage2D(), glCopyTexSubImage3D(),
       glPixelStore(), glTexImage1D(), glTexImage2D(), glTexImage3D(),
       glTexSubImage1D(), 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		   GLTEXSUBIMAGE2D(3G)
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