%mathent; ]> 2011-2013 Khronos Group glTexStorage1D 3G glTexStorage1D simultaneously specify storage for all levels of a one-dimensional texture void glTexStorage1D GLenum target GLsizei levels GLenum internalformat GLsizei width 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. 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, 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 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. GL_STENCIL_INDEX8 is accepted for internalformat only if the GL version is 4.4 or higher. 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 . glTexImage1D, glTexStorage2D, glTexStorage3D. Copyright 2011-2013 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/.