glTexStorage2D - OpenGL 4 Reference Pages

## Name

glTexStorage2D, glTextureStorage2D — 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`)`;

`void glTextureStorage2D(` | GLuint texture,
| GLsizei levels,
| GLenum internalformat,
| GLsizei width,
| GLsizei height`)`;

## Parameters

`target`

  Specifies the target to which the texture object is bound for `glTexStorage2D`. Must be one of `GL_TEXTURE_2D`, `GL_TEXTURE_1D_ARRAY`, `GL_TEXTURE_RECTANGLE`, `GL_PROXY_TEXTURE_2D`, `GL_PROXY_TEXTURE_1D_ARRAY`, `GL_PROXY_TEXTURE_RECTANGLE`, or `GL_PROXY_TEXTURE_CUBE_MAP`.

`texture`

  Specifies the texture object name for `glTextureStorage2D`. The effective target of `texture` must be one of the valid non-proxy `target` values above.

`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` and `glTextureStorage2D` specify 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));
        }

Calling `glTextureStorage2D` is equivalent to the above pseudo-code, where `target` is the effective target of `texture` and it is as if `texture` were bound to `target` for the purposes of `glTexImage2D`.

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`, one of the combined depth-stencil formats, `GL_DEPTH32F_STENCIL8`, or `GL_DEPTH24_STENCIL8`, or the stencil-only format, `GL_STENCIL_INDEX8`. 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.

Table 1. Sized Internal Formats

Sized Internal Format | Base Internal Format | Red Bits | Green Bits | Blue Bits | Alpha Bits | Shared Bits
--- | --- | --- | --- | --- | --- | ---
`GL_R8` | `GL_RED` | 8 |  |  |  |
`GL_R8_SNORM` | `GL_RED` | s8 |  |  |  |
`GL_R16` | `GL_RED` | 16 |  |  |  |
`GL_R16_SNORM` | `GL_RED` | s16 |  |  |  |
`GL_RG8` | `GL_RG` | 8 | 8 |  |  |
`GL_RG8_SNORM` | `GL_RG` | s8 | s8 |  |  |
`GL_RG16` | `GL_RG` | 16 | 16 |  |  |
`GL_RG16_SNORM` | `GL_RG` | s16 | s16 |  |  |
`GL_R3_G3_B2` | `GL_RGB` | 3 | 3 | 2 |  |
`GL_RGB4` | `GL_RGB` | 4 | 4 | 4 |  |
`GL_RGB5` | `GL_RGB` | 5 | 5 | 5 |  |
`GL_RGB8` | `GL_RGB` | 8 | 8 | 8 |  |
`GL_RGB8_SNORM` | `GL_RGB` | s8 | s8 | s8 |  |
`GL_RGB10` | `GL_RGB` | 10 | 10 | 10 |  |
`GL_RGB12` | `GL_RGB` | 12 | 12 | 12 |  |
`GL_RGB16_SNORM` | `GL_RGB` | 16 | 16 | 16 |  |
`GL_RGBA2` | `GL_RGB` | 2 | 2 | 2 | 2 |
`GL_RGBA4` | `GL_RGB` | 4 | 4 | 4 | 4 |
`GL_RGB5_A1` | `GL_RGBA` | 5 | 5 | 5 | 1 |
`GL_RGBA8` | `GL_RGBA` | 8 | 8 | 8 | 8 |
`GL_RGBA8_SNORM` | `GL_RGBA` | s8 | s8 | s8 | s8 |
`GL_RGB10_A2` | `GL_RGBA` | 10 | 10 | 10 | 2 |
`GL_RGB10_A2UI` | `GL_RGBA` | ui10 | ui10 | ui10 | ui2 |
`GL_RGBA12` | `GL_RGBA` | 12 | 12 | 12 | 12 |
`GL_RGBA16` | `GL_RGBA` | 16 | 16 | 16 | 16 |
`GL_SRGB8` | `GL_RGB` | 8 | 8 | 8 |  |
`GL_SRGB8_ALPHA8` | `GL_RGBA` | 8 | 8 | 8 | 8 |
`GL_R16F` | `GL_RED` | f16 |  |  |  |
`GL_RG16F` | `GL_RG` | f16 | f16 |  |  |
`GL_RGB16F` | `GL_RGB` | f16 | f16 | f16 |  |
`GL_RGBA16F` | `GL_RGBA` | f16 | f16 | f16 | f16 |
`GL_R32F` | `GL_RED` | f32 |  |  |  |
`GL_RG32F` | `GL_RG` | f32 | f32 |  |  |
`GL_RGB32F` | `GL_RGB` | f32 | f32 | f32 |  |
`GL_RGBA32F` | `GL_RGBA` | f32 | f32 | f32 | f32 |
`GL_R11F_G11F_B10F` | `GL_RGB` | f11 | f11 | f10 |  |
`GL_RGB9_E5` | `GL_RGB` | 9 | 9 | 9 |  | 5
`GL_R8I` | `GL_RED` | i8 |  |  |  |
`GL_R8UI` | `GL_RED` | ui8 |  |  |  |
`GL_R16I` | `GL_RED` | i16 |  |  |  |
`GL_R16UI` | `GL_RED` | ui16 |  |  |  |
`GL_R32I` | `GL_RED` | i32 |  |  |  |
`GL_R32UI` | `GL_RED` | ui32 |  |  |  |
`GL_RG8I` | `GL_RG` | i8 | i8 |  |  |
`GL_RG8UI` | `GL_RG` | ui8 | ui8 |  |  |
`GL_RG16I` | `GL_RG` | i16 | i16 |  |  |
`GL_RG16UI` | `GL_RG` | ui16 | ui16 |  |  |
`GL_RG32I` | `GL_RG` | i32 | i32 |  |  |
`GL_RG32UI` | `GL_RG` | ui32 | ui32 |  |  |
`GL_RGB8I` | `GL_RGB` | i8 | i8 | i8 |  |
`GL_RGB8UI` | `GL_RGB` | ui8 | ui8 | ui8 |  |
`GL_RGB16I` | `GL_RGB` | i16 | i16 | i16 |  |
`GL_RGB16UI` | `GL_RGB` | ui16 | ui16 | ui16 |  |
`GL_RGB32I` | `GL_RGB` | i32 | i32 | i32 |  |
`GL_RGB32UI` | `GL_RGB` | ui32 | ui32 | ui32 |  |
`GL_RGBA8I` | `GL_RGBA` | i8 | i8 | i8 | i8 |
`GL_RGBA8UI` | `GL_RGBA` | ui8 | ui8 | ui8 | ui8 |
`GL_RGBA16I` | `GL_RGBA` | i16 | i16 | i16 | i16 |
`GL_RGBA16UI` | `GL_RGBA` | ui16 | ui16 | ui16 | ui16 |
`GL_RGBA32I` | `GL_RGBA` | i32 | i32 | i32 | i32 |
`GL_RGBA32UI` | `GL_RGBA` | ui32 | ui32 | ui32 | ui32 |

## Notes

`GL_STENCIL_INDEX8` is accepted for `internalformat` only if the GL version is 4.4 or higher.

## Errors

`GL_INVALID_OPERATION` is generated by `glTexStorage2D` if zero is bound to `target`.

`GL_INVALID_OPERATION` is generated by `glTextureStorage2D` if `texture` is not the name of an existing texture object.

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

`GL_INVALID_ENUM` is generated if `target` or the effective target of `texture` is not one of the accepted targets described above.

`GL_INVALID_VALUE` is generated if `width`, `height` 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 .

## Version Support

| OpenGL Version
--- | ---
Function / Feature Name | 2.0 | 2.1 | 3.0 | 3.1 | 3.2 | 3.3 | 4.0 | 4.1 | 4.2 | 4.3 | 4.4 | 4.5
`glTexStorage2D` | - | - | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔
`glTextureStorage2D` | - | - | - | - | - | - | - | - | - | - | - | ✔

## See Also

glTexImage2D, glTexStorage1D, glTexStorage3D.

## Copyright

Copyright © 2011-2014 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/.