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Texture Clamping Background Information
OpenGL 1.0 provides clamping of texture coordinates: Any values greater than 1.0 are set to 1.0, any values less than 0.0 are set to 0.0. Clamping is useful for applications where you want a single copy of the texture to be mapped onto a large surface. Clamping is discussed in detail in the section "Repeating and Clamping Textures" in Chapter 9, "Texture Mapping," of the OpenGL Programming Guide.
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