From f0d1398b0d1b1a7c5bd1d4e0b3488b7f1aa74364 Mon Sep 17 00:00:00 2001
From: Matthew Kosarek <matthew.kosarek@vention.cc>
Date: Tue, 23 Feb 2021 19:39:16 -0500
Subject: Big rework of the directory structure to make it more orderly for my
 brain

---
 frontend/_shared/math/mat4.js | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 frontend/_shared/math/mat4.js

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

diff --git a/frontend/_shared/math/mat4.js b/frontend/_shared/math/mat4.js
new file mode 100644
index 0000000..6ab29e2
--- /dev/null
+++ b/frontend/_shared/math/mat4.js
@@ -0,0 +1,43 @@
+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;
+}
\ No newline at end of file
-- 
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