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GLTEXSUBIMAGE1D(3G)                                                                      GLTEXSUBIMAGE1D(3G)



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 *pixels )


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_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  symbolic  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.

       pixels   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 textur-ing texturing
       ing  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 pixels 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  tex-ture texture
       ture  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.

NOTES
       glTexSubImage1D is available only if the GL version is 1.1 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, glTexSubImage1D specifies a one-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  pro-cessed processed
       cessed by the imaging pipeline.  See glTexImage1D for specific details.

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

       GL_INVALID_OPERATION  is  generated  if  the  texture  array  has  not  been  defined  by  a previous
       glTexImage1D 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,  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_ENUM is generated if format is not an accepted
        constant.

       GL_INVALID_ENUM is generated if type is not a type constant.

       GL_INVALID_ENUM is generated if type is GL_BITMAP and format is not GL_COLOR_INDEX.

       GL_INVALID_OPERATION is generated if glTexSubImage1D is executed between the execution of glBegin and
       the corresponding execution of glEnd.

       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.

ASSOCIATED GETS
       glGetTexImage
       glIsEnabled with argument GL_TEXTURE_1D

SEE ALSO
       glActiveTextureARB(3G),  glCopyTexImage1D(3G),  glCopyTexImage2D(3G),  glCopyTexSubImage1D(3G),  glCopyTexSubImage2D(3G),
       glCopyTexSubImage3D(3G), glDrawPixels(3G), glPixelStore(3G), glPixelTransfer(3G), glTexEnv(3G),  glTexGen(3G),  glTexImage1D(3G),
       glTexImage2D(3G), glTexImage3D(3G), glTexParameter(3G), glTexSubImage2D(3G), glTexSubImage3D(3G)





                                                                                         GLTEXSUBIMAGE1D(3G)