glCopyTexImage2D man page on SunOS

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GLCOPYTEXIMAGE2D(3gl)					 GLCOPYTEXIMAGE2D(3gl)

NAME
       glCopyTexImage2D - copy pixels into a 2D texture image

C SPECIFICATION
       void glCopyTexImage2D( GLenum target,
			      GLint level,
			      GLenum internalFormat,
			      GLint x,
			      GLint y,
			      GLsizei width,
			      GLsizei height,
			      GLint border )

PARAMETERS
       target	       Specifies  the  target texture.	Must be GL_TEXTURE_2D,
		       GL_TEXTURE_CUBE_MAP_POSITIVE_X,		       GL_TEX‐
		       TURE_CUBE_MAP_NEGATIVE_X,     GL_TEXTURE_CUBE_MAP_POSI‐
		       TIVE_Y,	   GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,     GL_TEX‐
		       TURE_CUBE_MAP_POSITIVE_Z,     GL_TEXTURE_CUBE_MAP_NEGA‐
		       TIVE_Z, or GL_DETAIL_TEXTURE_2D_SGIS.

       level	       Specifies the level-of-detail number.  Level 0  is  the
		       base  image level.  Level n is the nth mipmap reduction
		       image.

       internalFormat  Specifies the internal format of the texture.  Must  be
		       one  of	the  following	symbolic  constants: GL_ALPHA,
		       GL_ALPHA4, GL_ALPHA8, GL_ALPHA12, GL_ALPHA16,  GL_LUMI‐
		       NANCE,  GL_LUMINANCE4,  GL_LUMINANCE8,  GL_LUMINANCE12,
		       GL_LUMINANCE16,	    GL_LUMINANCE_ALPHA,	      GL_LUMI‐
		       NANCE4_ALPHA4,	   GL_LUMINANCE6_ALPHA2,      GL_LUMI‐
		       NANCE8_ALPHA8,	  GL_LUMINANCE12_ALPHA4,      GL_LUMI‐
		       NANCE12_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,
		       GL_RGBA16,   GL_COMPRESSED_ALPHA,   GL_COMPRESSED_LUMI‐
		       NANCE,	   GL_COMPRESSED_LUMINANCE_ALPHA,      GL_COM‐
		       PRESSED_INTENSITY,      GL_COMPRESSED_RGB,      GL_COM‐
		       PRESSED_RGBA.

       x, y	       Specify the window coordinates of the lower left corner
		       of the rectangular region of pixels to be copied.

       width	       Specifies the width of the texture image.  Must be 0 or
		       2**n+2*border for some integer n.

       height	       Specifies  the  height of the texture image.  Must be 0
		       or 2**m+2*border for some integer m.

       border	       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 format 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 format 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.

       If  glCopyTexImage2D  is	 called	 on a constant texture, then a copy is
       made internally before executing the call. A  texture  is  a  "constant
       texture" if at the time of the specification of the texture no copy was
       made internally. See glTexImage2D and glPixelStore for details.

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.

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  log2max,
       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.

       GL_INVALID_VALUE is generated if	 target	 is  GL_DETAIL_TEXTURE_2D_SGIS
       and level or border is not 0.

ASSOCIATED GETS
       glGetTexImage
       glIsEnabled with argument GL_TEXTURE_2D

SEE ALSO
       glCopyPixels,  glCopyTexImage1D,	 glCopyTexSubImage1D,  glCopyTexSubIm‐
       age2D, glPixelStore, glPixelTransfer, glTexEnv, glTexGen, glTexImage1D,
       glTexImage2D, glTexSubImage1D, glTexSubImage2D, glTexParameter

				   15 Mar 97		 GLCOPYTEXIMAGE2D(3gl)
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