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Default Textures
You can still access the OpenGL 1.0 textures, now called the "default textures," by binding 0 to a texture target. This is in fact the initial binding when you create a rendering context. When you create a texture object, its images and parameters are the same as the initial settings of the default textures.
You can set the priority of a default texture by calling glTexParameter*(); you cannot use glPrioritizeTexturesEXT() with a default texture. Similarly, you can query the residence of a default texture with glGetTexParameter*(), but you cannot do so with glAreTexturesResidentEXT().
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