Index for Section 3G

Alphabetical listing for G

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glCopyTexSubImage1D(3G)
NAME
  glCopyTexSubImage1D - copy a one-dimensional texture subimage

SYNOPSIS
  void glCopyTexSubImage1D(
	  GLenum target,
	  GLint level,
	  GLint xoffset,
	  GLint x,
	  GLint y,
	  GLsizei width );

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 the texel offset within the texture array.

  x, y
      Specify the window coordinates of the left corner of the row of pixels
      to be copied.

  width
      Specifies the width of the texture subimage.

DESCRIPTION
  glCopyTexSubImage1D() replaces a portion of a one-dimensional texture image
  with pixels from the current GL_READ_BUFFER (rather than from main memory,
  as is the case for glTexSubImage1D).

  The screen-aligned pixel row with left corner at (x, y), and with length
  width replaces the portion of the texture array with x indices xoffset
  through "xoffset" + "width" - 1, inclusive. The destination in the texture
  array may not include any texels outside the texture array as it was
  originally specified.

  The pixels in the row are processed exactly as if glCopyPixels() had been
  called, but the process stops just before final conversion.  At this point
  all pixel component values are clamped to the range [0, 1] and then
  converted to the texture's internal  for storage in the texel array.

  It is not an error to specify a subtexture with zero width, but such a
  specification has no effect. If any of the pixels within the specified row
  of the current GL_READ_BUFFER are outside the read window associated with
  the current rendering context, then the values obtained for those pixels
  are undefined.

  No change is made to the internalformat, width, or border parameters of the
  specified texture array or to texel values outside the specified subregion.

NOTES
  glCopyTexSubImage1D() 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().

  When the GL_ARB_imaging extension is supported, the RGBA components copied
  from the framebuffer may be processed by the imaging pipeline.  See
  glTexImage1D() for specific details.

ERRORS
  GL_INVALID_ENUM is generated if target is not GL_TEXTURE_1D.

  GL_INVALID_OPERATION is generated if the texture array has not been defined
  by a previous glTexImage1D or glCopyTexImage1D operation.

  GL_INVALID_VALUE is generated if level is less than 0.

  GL_INVALID_VALUE may be generated if level>log sub 2 max, where max is the
  returned value of GL_MAX_TEXTURE_SIZE.

  GL_INVALID_VALUE is generated if y < -b or if width < -b, where b is the
  border width of the texture array.

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

ASSOCIATED GETS
       glGetTexImage()
       glIsEnabled() with argument GL_TEXTURE_1D

SEE ALSO
  glCopyPixels(3), glCopyTexImage1D(3), glCopyTexImage2D(3),
  glCopyTexSubImage2D(3), glCopyTexSubImage3D(3), glPixelStore(3),
  glPixelTransfer(3), glReadBuffer(3), glTexEnv(3), glTexGen(3),
  glTexImage1D(3), glTexImage2D(3), glTexImage3D(3), glTexParameter(3),
  glTexSubImage1D(3), glTexSubImage2D(3), glTexSubImage3D(3)

Index for Section 3G

Alphabetical listing for G

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