C SPECIFICATION

       void glTexSubImage3D( GLenum target,
                             GLint level,
                             GLint xoffset,
                             GLint yoffset,
                             GLint zoffset,
                             GLsizei width,
                             GLsizei height,
                             GLsizei depth,
                             GLenum format,
                             GLenum type,
                             const GLvoid *pixels )

PARAMETERS

       target   Specifies the target texture.  Must be GL_TEXTURE_3D.

       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.

       zoffset  Specifies a texel offset in the z direction within the texture
                array.

       width    Specifies the width of the texture subimage.

       height   Specifies the height of the texture subimage.

       depth    Specifies the depth of the texture subimage.

       format   Specifies the  of the pixel data.  The following symbolic val-
                ues are accepted: GL_COLOR_INDEX, GL_RED,  GL_GREEN,  GL_BLUE,
                GL_ALPHA,  GL_RGB, GL_BGR, GL_RGBA, GL_BGRA, GL_LUMINANCE, and
                GL_LUMINANCE_ALPHA.

       type     Specifies the data type of the pixel data.  The following sym-
                bolic   values   are   accepted:   GL_UNSIGNED_BYTE,  GL_BYTE,
                GL_BITMAP,   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.

       array as it was originally specified.  It is not an error to specify  a
       subtexture  with  zero width, height, or depth but such a specification
       has no effect.

NOTES

       glTexSubImage3D is available only if the GL version is 1.2 or  greater.

       Texturing has no effect in color index mode.

       glPixelStore and glPixelTransfer modes affect texture images in exactly
       the way they affect glDrawPixels.

       Formats  GL_BGR,  and   GL_BGRA   and   types   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 are available only if the GL version  is
       1.2 or greater.

       When  the  GL_ARB_multitexture  extension is supported, glTexSubImage3D
       specifies a three-dimensional sub texture for the current texture unit,
       specified with glActiveTextureARB.

       When  the  GL_ARB_imaging  extension  is supported, the RGBA components
       specified in pixels may be processed  by  the  imaging  pipeline.   See
       glTexImage3D for specific details.

ERRORS

       GL_INVALID_ENUM is generated if target is not GL_TEXTURE_3D.

       GL_INVALID_OPERATION  is  generated  if  the texture array has not been
       defined by a previous glTexImage3D operation.

       GL_INVALID_VALUE is generated if level is less than 0.

       GL_INVALID_VALUE may be generated if level is greater  than  log2(max),
       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), or zoffset < -b, or zoffset  +
       depth   >  (d  -  b),  where  w  is  the  GL_TEXTURE_WIDTH,  h  is  the
       GL_TEXTURE_HEIGHT, d is the GL_TEXTURE_DEPTH and b is the border  width
       of  the  texture  image  being modified.  Note that w, h, and d include
       twice the border width.

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

       GL_INVALID_ENUM is generated if format is not an accepted
        constant.

       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 for-
       mat is neither GL_RGBA nor GL_BGRA.

ASSOCIATED GETS

       glGetTexImage
       glIsEnabled with argument GL_TEXTURE_3D

SEE ALSO

       glActiveTextureARB,         glCopyTexImage1D,         glCopyTexImage2D,
       glCopyTexSubImage1D,      glCopyTexSubImage2D,     glCopyTexSubImage3D,
       glDrawPixels,  glPixelStore,   glPixelTransfer,   glTexEnv,   glTexGen,
       glTexImage1D,      glTexImage2D,     glTexImage3D,     glTexSubImage1D,
       glTexSubImage2D, glTexParameter




                                                           GLTEXSUBIMAGE3D(3G)