glTexSubImage1D(3)

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 )

       delim $$

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  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.

       pixels   Specifies a pointer to the image data in memory.

DESCRIPTION

       Texturing maps a portion of a specified texture image onto each graphi-
       cal 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 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 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.

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 processed  by  the  imaging  pipeline.   See
       glTexImage1D for specific details.

ERRORS

       GL_INVALID_ENUM is generated if target is not one of the allowable val-
       ues.

       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 $log sub
       2$max, where max is the returned value of GL_MAX_TEXTURE_SIZE.

       GL_INVALID_VALUE is generated if $"xoffset" ~<~ ~-b$,  or  if  $("xoff-
       set"~+~"width")  ~>~ (w ~-~ b)$, 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 for-
       mat is neither GL_RGBA nor GL_BGRA.

ASSOCIATED GETS

       glGetTexImage
       glIsEnabled with argument GL_TEXTURE_1D

glTexSubImage1D(3)

NAME

C SPECIFICATION

PARAMETERS

DESCRIPTION

NOTES

ERRORS

ASSOCIATED GETS

SEE ALSO