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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 © 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			  04/29/2014		    GLTEXSTORAGE2D(3G)

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