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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 (C) 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				    06/10/2014			     GLCOPYTEXIMAGE2D(3G)
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