21 lines
615 B
TypeScript
21 lines
615 B
TypeScript
import Matrix4 from "./Matrix4";
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export function identityMatrix(size: number): Float32Array {
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const mat = Array<number>(size*size).fill(0);
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return new Float32Array(
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mat.map((_, index) =>
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index % 5 === 0 ? 1 : 0
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));
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}
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export function perspMat(fovDeg: number, aspect: number, near: number, far: number): Matrix4 {
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const f = Math.tan(Math.PI * 0.5 - 0.5 * fovDeg);
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const rangeInv = 1.0 / (near - far);
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return new Matrix4([
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f / aspect, 0, 0, 0,
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0, f, 0, 0,
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0, 0, (near + far) * rangeInv, -1,
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0, 0, near * far * rangeInv * 2, 0
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]);
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} |