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GLCOPYTEXIMAGE2D(3G)		 OpenGL Manual		  GLCOPYTEXIMAGE2D(3G)

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_TEXTURE_CUBE_MAP_NEGATIVE_X,
	   GL_TEXTURE_CUBE_MAP_POSITIVE_Y, GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
	   GL_TEXTURE_CUBE_MAP_POSITIVE_Z, or GL_TEXTURE_CUBE_MAP_NEGATIVE_Z.

       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_COMPRESSED_RED, GL_COMPRESSED_RG,
	   GL_COMPRESSED_RGB, GL_COMPRESSED_RGBA.  GL_COMPRESSED_SRGB,
	   GL_COMPRESSED_SRGB_ALPHA.  GL_DEPTH_COMPONENT,
	   GL_DEPTH_COMPONENT16, GL_DEPTH_COMPONENT24, GL_DEPTH_COMPONENT32,
	   GL_RED, GL_RG, 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_SRGB,
	   GL_SRGB8, GL_SRGB_ALPHA, or GL_SRGB8_ALPHA8.

       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, or cube-map
       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.
       internalformat specifies the internal format of the texture array.

       The pixels in the rectangle are processed exactly as if glReadPixels()
       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
       rendering context, then the values obtained for those pixels are
       undefined.

       When internalformat is one of the sRGB types, the GL does not
       automatically convert the source pixels to the sRGB color space. In
       this case, the glPixelMap function can be used to accomplish the
       conversion.

NOTES
       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_TEXTURE_CUBE_MAP_POSITIVE_X, GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
       GL_TEXTURE_CUBE_MAP_POSITIVE_Y, GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
       GL_TEXTURE_CUBE_MAP_POSITIVE_Z, or GL_TEXTURE_CUBE_MAP_NEGATIVE_Z.

       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 is less than 0 or greater than
       GL_MAX_TEXTURE_SIZE.

       GL_INVALID_VALUE is generated if non-power-of-two textures are not
       supported and the width or depth 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 an accepted
       format.

       GL_INVALID_OPERATION is generated if internalformat is
       GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT16, GL_DEPTH_COMPONENT24, or
       GL_DEPTH_COMPONENT32 and there is no depth buffer.

ASSOCIATED GETS
       glGetTexImage()

SEE ALSO
       glCopyTexImage1D(), glCopyTexSubImage1D(), glCopyTexSubImage2D(),
       glPixelStore(), glTexImage1D(), glTexImage2D(), glTexSubImage1D(),
       glTexSubImage2D(), glTexParameter()

COPYRIGHT
       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
       under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org			  03/16/2013		  GLCOPYTEXIMAGE2D(3G)
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