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glTexStorage3D

Name

glTexStorage3D, glTextureStorage3D — 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);
void glTextureStorage3D( GLuint texture,
GLsizei levels,
GLenum internalformat,
GLsizei width,
GLsizei height,
GLsizei depth);

Parameters

target

Specifies the target to which the texture object is bound for glTexStorage3D. Must be one of GL_TEXTURE_3D, GL_TEXTURE_2D_ARRAY, GL_TEXTURE_CUBE_ARRAY, GL_PROXY_TEXTURE_3D, GL_PROXY_TEXTURE_2D_ARRAY or GL_PROXY_TEXTURE_CUBE_ARRAY.

texture

Specifies the texture object name for glTextureStorage3D. 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.

depth

Specifies the depth of the texture, in texels.

Description

glTexStorage3D and glTextureStorage3D specify specify 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));
    }

Calling glTextureStorage3D 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 glTexImage3D.

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 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.

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 glTexStorage3D if zero is bound to target.

GL_INVALID_OPERATION is generated by glTextureStorage3D 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, depth 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 .

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
glTexStorage3D - - - - - - - -
glTextureStorage3D - - - - - - - - - - -
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