Set up your OpenGL program to provide the position in attribute location 0, the normal in attribute location 1, the texture coordinate in location 2, and the tangent vector in location 3. For this example, the fourth coordinate of the tangent vector should contain the handedness of the tangent coordinate system (either -1 or +1). This value will be multiplied by the result of the cross product.
Load the normal map into texture unit one and the color texture into texture unit zero.
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