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glTexSubImage1D(3G)


NAME

  glTexSubImage1D - specify a one-dimensional texture subimage


SYNOPSIS

  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 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 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[t]exture 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 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 log sub 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_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(3), glCopyTexImage1D(3glCopyTexImage2D),
  glCopyTexSubImage1D(3), glCopyTexSubImage2D(3), (3),
  glCopyTexSubImage3D(3), glDrawPixels(3), glPixelStore(3),
  glPixelTransfer(3), glTexEnv(3), glTexGen(3), glTexImage1D(3),
  glTexImage2D(3), glTexImage3D(3), glTexParameter(3), glTexSubImage2D(3),
  glTexSubImage3D(3)

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