47 lines
No EOL
1 KiB
JavaScript
47 lines
No EOL
1 KiB
JavaScript
const PI = Math.PI
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const PI2 = PI * 2
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const PIH = PI * 0.5
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const cosFromSin = (sin, angle) => {
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const pih = PI / 2;
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const pi2 = PI * 2
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const cos = Math.sqrt(1.0 - sin * sin);
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const a = angle + PIH;
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const b = a - parseInt(a / PI2) * PI2;
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if (b < 0.0)
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b = PIH + b;
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if (b >= PI)
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return -cos;
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return cos;
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}
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export class Mat4 {
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constructor() {
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this.data = [
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0, 0, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0
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]
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}
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set(m00, m01, m02, m03, m10, m11, m12, m13, m20, m21, m22, m23, m30, m31, m32, m33) {
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const d = this.data
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d[0] = m00; d[4] = m01; d[8] = m02; d[12] = m03;
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d[1] = m10; d[5] = m11; d[9] = m12; d[13] = m13;
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d[2] = m20; d[6] = m21; d[10] = m22; d[14] = m23;
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d[3] = m30; d[7] = m31; d[11] = m32; d[15] = m33;
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return this
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}
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identity() {
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this.set(
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1, 0, 0, 0,
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0, 1, 0, 0,
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0, 0, 1, 0,
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0, 0, 0, 1
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)
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return this
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}
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} |