feat(dependency): lookAt

Add setLookAt to Matrix4

src/construct/domain_layer/library/structure/matrix/Matrix4.re

@@ -600,3 +600,36 @@ let getEulerAngles = matTypeArr => {
 
   (x^, y, z^)->Vector3.scale(Vector3.Float, Angle.getRadToDeg());
 };
+
+let setLookAt = (eye, center, up) => {
+  let (z1, z2, z3) as z = 
+    Vector3.sub(Vector3.Float, eye, center) -> Vector3.normalize;
+
+  let y = up -> Vector3.normalize;
+
+  let (x1, x2, x3) as x = 
+    Vector3.cross(y, z) -> Vector3.normalize;
+
+  let (y1, y2, y3) = Vector3.cross(z, x);
+
+  let (eyeX, eyeY, eyeZ) = eye;
+
+  Float32Array.make([|
+    x1,
+    x2,
+    x3,
+    0.,
+    y1,
+    y2,
+    y3,
+    0.,
+    z1,
+    z2,
+    z3,
+    0.,
+    eyeX,
+    eyeY,
+    eyeZ,
+    1.,
+  |]);
+}

test/construct/unit/library/structure/Matrix4_test.re

@@ -0,0 +1,44 @@
+open Wonder_jest;
+open Js.Typed_array;
+
+let _ = 
+	describe("Matrix4", () => {
+    open Expect;
+    open Expect.Operators;
+    open Sinon;
+
+    let sandbox = getSandboxDefaultVal();
+
+    beforeEach(() => {
+      sandbox := createSandbox();
+      TestTool.init(~sandbox, ());
+    });
+
+    afterEach(() => restoreSandbox(refJsObjToSandbox(sandbox^)));
+
+    describe("setLookAt", () => {
+      test("test", () => {
+        let matrix = Matrix4.setLookAt((0., 0., 20.), (0., 0., 0.), (0., 1., 0.));
+        let result = Float32Array.make([|
+          1.0,
+          0.0,
+          0.0,
+          0.0,
+          0.0,
+          1.0,
+          0.0,
+          0.0,
+          0.0,
+          0.0,
+          1.0,
+          0.0,
+          0.0,
+          0.0,
+          20.0,
+          1.0
+        |]);
+
+        matrix -> expect == result;
+      })
+    })
+  })