21 lines
487 B
JavaScript
21 lines
487 B
JavaScript
module.exports = multiply
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/**
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* Multiplies two mat2's
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*
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* @alias mat2.multiply
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* @param {mat2} out the receiving matrix
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* @param {mat2} a the first operand
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* @param {mat2} b the second operand
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* @returns {mat2} out
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*/
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function multiply(out, a, b) {
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var a0 = a[0], a1 = a[1], a2 = a[2], a3 = a[3]
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var b0 = b[0], b1 = b[1], b2 = b[2], b3 = b[3]
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out[0] = a0 * b0 + a2 * b1
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out[1] = a1 * b0 + a3 * b1
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out[2] = a0 * b2 + a2 * b3
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out[3] = a1 * b2 + a3 * b3
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return out
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}
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