glCopyTexImage2D man page on DigitalUNIX

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glCopyTexImage2D(3G)					  glCopyTexImage2D(3G)

NAME
       glCopyTexImage2D - copy pixels into a 2D texture image

SYNOPSIS
       void glCopyTexImage2D(
	       GLenum target,
	       GLint level,
	       GLenum internalformat,
	       GLint x,
	       GLint y,
	       GLsizei width,
	       GLsizei height,
	       GLint border );

PARAMETERS
       Specifies  the  target  texture.	 Must be GL_TEXTURE_2D.	 Specifies the
       level-of-detail number. Level 0 is the base image level. Level n is the
       nth  mipmap  reduction  image.  Specifies the internal  of the texture.
       Must be one of the following symbolic constants:	 GL_ALPHA,  GL_ALPHA4,
       GL_ALPHA8,   GL_ALPHA12,	  GL_ALPHA16,	GL_LUMINANCE,	GL_LUMINANCE4,
       GL_LUMINANCE8,  GL_LUMINANCE12,	 GL_LUMINANCE16,   GL_LUMINANCE_ALPHA,
       GL_LUMINANCE4_ALPHA4,	GL_LUMINANCE6_ALPHA2,	 GL_LUMINANCE8_ALPHA8,
       GL_LUMINANCE12_ALPHA4, GL_LUMINANCE12_ALPHA12,  GL_LUMINANCE16_ALPHA16,
       GL_INTENSITY,  GL_INTENSITY4,  GL_INTENSITY8, GL_INTENSITY12, GL_INTEN‐
       SITY16,	GL_RGB,	 GL_R3_G3_B2,  GL_RGB4,	 GL_RGB5,  GL_RGB8,  GL_RGB10,
       GL_RGB12,  GL_RGB16, GL_RGBA, GL_RGBA2, GL_RGBA4, GL_RGB5_A1, GL_RGBA8,
       GL_RGB10_A2, GL_RGBA12, or GL_RGBA16.  Specify the  window  coordinates
       of  the	lower  left  corner  of the rectangular region of pixels to be
       copied.	Specifies the width of the texture image. Must be 0 or	2^n  +
       2*border	 for  some  integer  n.	  Specifies  the height of the texture
       image. Must be 0 or 2^m + 2*border for some integer m.	Specifies  the
       width of the border. Must be either 0 or 1.

DESCRIPTION
       glCopyTexImage2D	 defines  a  two-dimensional texture image with pixels
       from the current GL_READ_BUFFER.

       The screen-aligned pixel rectangle with lower left corner at (x, y) and
       with  a width of width+2*border and a height of height+2*border defines
       the texture array at the mipmap level specified by level.  internalfor‐
       mat specifies the internal  of the texture array.

       The  pixels  in	the rectangle 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.

       Pixel ordering is such that lower x and y screen coordinates correspond
       to lower s and t texture coordinates.

       If any of the pixels within the	specified  rectangle  of  the  current
       GL_READ_BUFFER  are outside the window associated with the current ren‐
       dering context, then the values obtained for  those  pixels  are	 unde‐
       fined.

NOTES
       glCopyTexImage2D is available only if the GL version is 1.1 or greater.

       Texturing has no effect in color index mode.

       1, 2, 3, and 4 are not accepted values for internalformat.

       An image with height or width of 0 indicates a NULL texture.

       When  the  GL_ARB_imaging  extension  is supported, the RGBA components
       read 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_2D.

       GL_INVALID_VALUE is generated if level is less than 0.

       GL_INVALID_VALUE	 may  be generated if level is greater than log[2]max,
       where max is the returned value of GL_MAX_TEXTURE_SIZE.

       GL_INVALID_VALUE is generated if	 width	or  height  is	less  than  0,
       greater	than  2+GL_MAX_TEXTURE_SIZE,  or  if width or height cannot be
       represented as 2^k + 2*border for some integer k.

       GL_INVALID_VALUE is generated if border is not 0 or 1.

       GL_INVALID_VALUE is generated if	 internalformat	 is  not  one  of  the
       allowable values.

       GL_INVALID_OPERATION  is	 generated  if	glCopyTexImage2D() is executed
       between the execution of glBegin() and the corresponding	 execution  of
       glEnd().

ASSOCIATED GETS
       glGetTexImage()
       glIsEnabled() with argument GL_TEXTURE_2D

SEE ALSO
       glCopyPixels(3),	 glCopyTexImage1D(3),  glCopyTexSubImage1D(3), glCopy‐
       TexSubImage2D(3),  glPixelStore(3),  glPixelTransfer(3),	  glTexEnv(3),
       glTexGen(3),   glTexImage1D(3),	 glTexImage2D(3),  glTexSubImage1D(3),
       glTexSubImage2D(3), glTexParameter(3)

							  glCopyTexImage2D(3G)
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