NAME

       glTexSubImage1D - specify a one-dimensional texture subimage

C SPECIFICATION

       void glTexSubImage1D(GLenum target, GLint level, GLint xoffset, GLsizei width, GLenum format,
                            GLenum type, const GLvoid * data);

PARAMETERS

       target
           Specifies the target texture. Must be GL_TEXTURE_1D.

       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.

       width
           Specifies the width 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, GL_DEPTH_COMPONENT, and GL_STENCIL_INDEX.

       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. To enable or disable one-dimensional texturing, call glEnable() and glDisable() with argument
       GL_TEXTURE_1D.

       glTexSubImage1D redefines a contiguous subregion of an existing one-dimensional texture image. The texels
       referenced by data replace the portion of the existing texture array with x indices xoffset and xoffset +
       width - 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.

       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.

       glTexSubImage1D specifies a one-dimensional subtexture for the current texture unit, specified with
       glActiveTexture().

       GL_STENCIL_INDEX is accepted for format only if the GL version is 4.4 or higher.

ERRORS

       GL_INVALID_ENUM is generated if target is not one of the allowable values.

       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, or if xoffset + width > w - b, where w is the
       GL_TEXTURE_WIDTH, and b is the width of the GL_TEXTURE_BORDER of the texture image being modified. Note
       that w includes twice the border width.

       GL_INVALID_VALUE is generated if width is less than 0.

       GL_INVALID_OPERATION is generated if the texture array has not been defined by a previous glTexImage1D()
       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 format is GL_STENCIL_INDEX and the base internal format is not
       GL_STENCIL_INDEX.

       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(), glTexParameter(),
       glTexSubImage2D(), glTexSubImage3D()

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                                         10/22/2013                                GLTEXSUBIMAGE1D(3G)