First commit

src/utils.ts

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