glTexStorage3D man page on RedHat
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GLTEXSTORAGE3D(3G) OpenGL Manual GLTEXSTORAGE3D(3G)
NAME
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.
<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_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/.
AUTHORS
opengl.org
opengl.org 03/16/2013 GLTEXSTORAGE3D(3G)
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