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Added new Performance and Quality option—Negative LOD bias

This control lets the user manually set negative LOD bias to "clamp" for applications that automatically enable anisotropic filtering. Applications sometimes use negative LOD bias to sharpen texture filtering. This sharpens the stationary image but introduces aliasing when the scene is in motion.

Because anisotropic filtering provides texture sharpening without unwanted aliasing, it is desirable to clamp LOD bias when anisotropic filtering is enabled. When the user enables anisotropic filtering through the control panel, the control is automatically set to "Clamp".