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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 (C) 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				    06/10/2014			      GLTEXSUBIMAGE2D(3G)
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