From a00c0aab1eb5a7a55bef8ca08115bdd722ab5699 Mon Sep 17 00:00:00 2001
From: Matthew Kosarek <mattkae@protonmail.com>
Date: Sun, 16 May 2021 19:50:15 -0400
Subject: Moved the frontend directory up so that it no longer exists

---
 _shared/math/mat4.js | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 _shared/math/mat4.js

(limited to '_shared/math/mat4.js')

diff --git a/_shared/math/mat4.js b/_shared/math/mat4.js
new file mode 100644
index 0000000..d31a20e
--- /dev/null
+++ b/_shared/math/mat4.js
@@ -0,0 +1,63 @@
+function mat4() {
+    return [
+        1, 0, 0, 0,
+        0, 1, 0, 0,
+        0, 0, 1, 0,
+        0, 0, 0, 1
+    ]
+}
+
+function orthographic(pLeft, pRight, pBottom, pTop) {
+    const lResult = mat4();
+    lResult[0] = 2.0 / (pRight - pLeft);
+    lResult[5] = 2.0 / (pTop - pBottom);
+    lResult[10] = 1.0;
+    lResult[12] = -(pRight + pLeft) / (pRight - pLeft);
+    lResult[13] = -(pTop + pBottom) / (pTop - pBottom);
+    return lResult;
+}
+
+function translateMatrix(m, x, y, z) {
+    m = [...m];
+    m[12] += x;
+    m[13] += y;
+    m[14] += z;
+    return m;
+}
+
+function rotateMatrix2d(m, angle) {
+    m = [...m];
+    m[0] = Math.cos(angle);
+    m[1] = -Math.sin(angle);
+    m[4] = Math.sin(angle);
+    m[5] = Math.cos(angle);
+    return m;
+}
+
+function scaleMatrix(m, x, y, z) {
+    m = [...m];
+    m[0] = m[0] * x;
+    m[5] = m[5] * y;
+    m[10] = m[10] * z;
+    return m;
+}
+
+function multMat4ByVec2(matrix, vec) {
+    var lInnerVec = {...vec};
+    lInnerVec.z = 0.0;
+    lInnerVec.w = 1.0;
+
+    return {
+        x: lInnerVec.x * matrix[0] + lInnerVec.y * matrix[4] + lInnerVec.z * matrix[8] + lInnerVec.w * matrix[12],
+        y: lInnerVec.x * matrix[1] + lInnerVec.y * matrix[5] + lInnerVec.z * matrix[9] + lInnerVec.w * matrix[13]
+    };
+}
+
+function multMat4ByVec4(matrix, vec) {
+    return {
+        x: vec.x * matrix[0] + vec.y * matrix[4] + vec.z * matrix[8] + vec.w * matrix[12],
+        y: vec.x * matrix[1] + vec.y * matrix[5] + vec.z * matrix[9] + vec.w * matrix[13],
+        z: vec.x * matrix[2] + vec.y * matrix[6] + vec.z * matrix[10] + vec.w * matrix[14],
+        w: vec.x * matrix[3] + vec.y * matrix[7] + vec.z * matrix[11] + vec.w * matrix[15]
+    };
+}
\ No newline at end of file
-- 
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