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GLTEXSTORAGE2D(3G)			  OpenGL Manual 		       GLTEXSTORAGE2D(3G)

NAME
       glTexStorage2D - simultaneously specify storage for all levels of a two-dimensional or
       one-dimensional array texture

C SPECIFICATION
       void glTexStorage2D(GLenum target, GLsizei levels, GLenum internalformat, GLsizei width,
			   GLsizei height);

PARAMETERS
       target
	   Specify the target of the operation.  target must be one of GL_TEXTURE_2D,
	   GL_PROXY_TEXTURE_2D, GL_TEXTURE_1D_ARRAY, GL_PROXY_TEXTURE_1D_ARRAY,
	   GL_TEXTURE_RECTANGLE, GL_PROXY_TEXTURE_RECTANGLE, or GL_PROXY_TEXTURE_CUBE_MAP.

       levels
	   Specify the number of texture levels.

       internalformat
	   Specifies the sized internal format to be used to store texture image data.

       width
	   Specifies the width of the texture, in texels.

       height
	   Specifies the height of the texture, in texels.

DESCRIPTION
       glTexStorage2D specifies the storage requirements for all levels of a two-dimensional
       texture or one-dimensional texture array simultaneously. Once a texture is specified with
       this command, the format and dimensions of all levels become immutable unless it is a
       proxy texture. The contents of the image may still be modified, however, its storage
       requirements may not change. Such a texture is referred to as an immutable-format texture.

       The behavior of glTexStorage2D depends on the target parameter. When target is
       GL_TEXTURE_2D, GL_PROXY_TEXTURE_2D, GL_TEXTURE_RECTANGLE, GL_PROXY_TEXTURE_RECTANGLE or
       GL_PROXY_TEXTURE_CUBE_MAP, calling glTexStorage2D is equivalent, assuming no errors are
       generated, to executing the following pseudo-code:

	       for (i = 0; i < levels; i++)
	       {
		   glTexImage2D(target, i, internalformat, width, height, 0, format, type, NULL);
		   width = max(1, (width / 2));
		   height = max(1, (height / 2));
	       }

       When target is GL_TEXTURE_CUBE_MAP, glTexStorage2D is equivalent to:

	       for (i = 0; i < levels; i++)
	       {
		   for (face in (+X, -X, +Y, -Y, +Z, -Z))
		   {
		       glTexImage2D(face, i, internalformat, width, height, 0, format, type, NULL);
		   }
		   width = max(1, (width / 2));
		   height = max(1, (height / 2));
	       }

       When target is GL_TEXTURE_1D or GL_TEXTURE_1D_ARRAY, glTexStorage2D is equivalent to:

	       for (i = 0; i < levels; i++)
	       {
		   glTexImage2D(target, i, internalformat, width, height, 0, format, type, NULL);
		   width = max(1, (width / 2));
	       }

       Since no texture data is actually provided, the values used in the pseudo-code for format
       and type are irrelevant and may be considered to be any values that are legal for the
       chosen internalformat enumerant.  internalformat must be one of the sized internal formats
       given in Table 1 below, one of the sized depth-component formats GL_DEPTH_COMPONENT32F,
       GL_DEPTH_COMPONENT24, or GL_DEPTH_COMPONENT16, or one of the combined depth-stencil
       formats, GL_DEPTH32F_STENCIL8, or GL_DEPTH24_STENCIL8. Upon success, the value of
       GL_TEXTURE_IMMUTABLE_FORMAT becomes GL_TRUE. The value of GL_TEXTURE_IMMUTABLE_FORMAT may
       be discovered by calling glGetTexParameter() with pname set to
       GL_TEXTURE_IMMUTABLE_FORMAT. No further changes to the dimensions or format of the texture
       object may be made. Using any command that might alter the dimensions or format of the
       texture object (such as glTexImage2D() or another call to glTexStorage2D) will result in
       the generation of a GL_INVALID_OPERATION error, even if it would not, in fact, alter the
       dimensions or format of the object.

       <xi:include></xi:include>

ERRORS
       GL_INVALID_ENUM is generated if internalformat is not a valid sized internal format.

       GL_INVALID_ENUM is generated if target is not one of the accepted target enumerants.

       GL_INVALID_VALUE is generated if width or levels are less than 1.

       GL_INVALID_OPERATION is generated if target is GL_TEXTURE_1D_ARRAY or
       GL_PROXY_TEXTURE_1D_ARRAY and levels is greater than log 2 width + 1.

       GL_INVALID_OPERATION is generated if target is not GL_TEXTURE_1D_ARRAY or
       GL_PROXY_TEXTURE_1D_ARRAY and levels is greater than log 2 max width ,	height + 1.

SEE ALSO
       glTexImage2D(), glTexStorage1D(), glTexStorage3D().

COPYRIGHT
       Copyright (C) 2011 Khronos Group. This material may be distributed subject to the terms
       and conditions set forth in the Open Publication License, v 1.0, 8 June 1999.
       http://opencontent.org/openpub/.

AUTHORS
       opengl.org

opengl.org				    06/10/2014			       GLTEXSTORAGE2D(3G)
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