glTexStorage1D man page on RedHat
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GLTEXSTORAGE1D(3G) OpenGL Manual GLTEXSTORAGE1D(3G)
NAME
glTexStorage1D - simultaneously specify storage for all levels of a
one-dimensional texture
C SPECIFICATION
void glTexStorage1D(GLenum target, GLsizei levels,
GLenum internalformat, GLsizei width);
PARAMETERS
target
Specify the target of the operation. target must be either
GL_TEXTURE_1D or GL_PROXY_TEXTURE_1D.
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.
DESCRIPTION
glTexStorage1D specifies the storage requirements for all levels of a
one-dimensional 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.
Calling glTexStorage1D is equivalent, assuming no errors are generated,
to executing the following pseudo-code:
for (i = 0; i < levels; i++)
{
glTexImage1D(target, i, internalformat, width, 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 glTexImage1D() or another call to
glTexStorage1D) 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 GL_TEXTURE_1D or
GL_TEXTURE_2D.
GL_INVALID_VALUE is generated if width or levels are less than 1.
GL_INVALID_OPERATION is generated if levels is greater than log 2 width
+ 1.
SEE ALSO
glTexImage1D(), glTexStorage2D(), 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 03/16/2013 GLTEXSTORAGE1D(3G)
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