2011 Khronos Group
glTexStorage3D 3G
glTexStorage3D simultaneously specify storage for all levels of a three-dimensional, two-dimensional array or cube-map array texture

## C Specification

void `glTexStorage3D` GLenum target GLsizei levels GLenum internalformat GLsizei width GLsizei height GLsizei depth

## Parameters

target

  Specify the target of the operation. target must be one of `GL_TEXTURE_3D`, `GL_PROXY_TEXTURE_3D`, `GL_TEXTURE_2D_ARRAY`, `GL_PROXY_TEXTURE_2D_ARRAY`, `GL_TEXTURE_CUBE_ARRAY`, or `GL_PROXY_TEXTURE_CUBE_ARRAY`.

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.

depth

  Specifies the depth of the texture, in texels.

## Description

`glTexStorage3D` specifies the storage requirements for all levels of a three-dimensional, two-dimensional array or cube-map array texture 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 `glTexStorage3D` depends on the target parameter. When target is `GL_TEXTURE_3D`, or `GL_PROXY_TEXTURE_3D`, calling `glTexStorage3D` is equivalent, assuming no errors are generated, to executing the following pseudo-code:

        for (i = 0; i < levels; i++)
        {
            glTexImage3D(target, i, internalformat, width, height, depth, 0, format, type, NULL);
            width = max(1, (width / 2));
            height = max(1, (height / 2));
            depth = max(1, (depth / 2));
        }

When target is `GL_TEXTURE_2D_ARRAY`, `GL_PROXY_TEXTURE_2D_ARRAY`, `GL_TEXTURE_CUBE_MAP_ARRAY`, or `GL_PROXY_TEXTURE_CUBE_MAP_ARRAY`, `glTexStorage3D` is equivalent to:

        for (i = 0; i < levels; i++)
        {
            glTexImage3D(target, i, internalformat, width, height, depth, 0, format, type, NULL);
            width = max(1, (width / 2));
            height = max(1, (height / 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 glTexImage3D or another call to `glTexStorage3D`) 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.

## 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_3D` or `GL_PROXY_TEXTURE_3D` and levels is greater than log 2 max width , height , depth + 1 .

`GL_INVALID_OPERATION` is generated if target is `GL_TEXTURE_2D_ARRAY`, `GL_PROXY_TEXTURE_2D_ARRAY`, `GL_TEXURE_CUBE_ARRAY`, or `GL_PROXY_TEXTURE_CUBE_MAP_ARRAY` and levels is greater than log 2 max width , height + 1 .

## See Also

glTexImage3D, glTexStorage1D, glTexStorage2D.

## 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/.