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/2d/program_common.js | 75 +++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 frontend/_shared/2d/program_common.js

(limited to 'frontend/_shared/2d/program_common.js')

diff --git a/frontend/_shared/2d/program_common.js b/frontend/_shared/2d/program_common.js
new file mode 100644
index 0000000..48d0a6b
--- /dev/null
+++ b/frontend/_shared/2d/program_common.js
@@ -0,0 +1,75 @@
+/// <reference path="shader.js" />
+/// <reference path="../math/mat4.js" />
+
+function getContext(pId, pOnRun) {
+    const lCanvas = $(pId).find('canvas'),
+        lPlayButton = $(pId).find('.play_button'),
+        lStopButton = $(pId).find('.stop_button'),
+        lGl = lCanvas[0].getContext('webgl'),
+        lWidth = lCanvas.width(),
+        lHeight = lCanvas.height();
+
+    return {
+        canvas: lCanvas,
+        playButton: lPlayButton,
+        stopButton: lStopButton,
+        gl: lGl,
+        width: lWidth,
+        height: lHeight,
+        perspective: orthographic(0, lWidth, 0, lHeight),
+        load: function() {
+            lPlayButton.empty().append($('<div>').addClass('spin-loader'));
+            return loadOrthographicShader(lGl).then(function(pProgramInfo) {
+                lPlayButton.css('display', 'none');
+                lStopButton.css('display', 'block');
+                return pProgramInfo;
+            });
+        },
+        reset: function() {
+            lPlayButton.css('display', 'block');
+            lPlayButton.empty().text('Play');
+            lStopButton.css('display', 'none');
+            lStopButton.on('click', undefined);
+        }
+    };
+}
+
+function requestUpdateLoop(pFunction, pOnExit) {
+    let lDeltaTimeSeconds = undefined,
+        lLastTimeSeconds = undefined,
+        lIsRunning = true;
+
+    function update(pTimeStamp) {
+        if (!lIsRunning) {
+            if (pOnExit) {
+                pOnExit();
+            }
+            return;
+        }
+
+        pTimeStamp = pTimeStamp / 1000.0; // Convert to seconds
+
+        // Time calculation
+        if (lLastTimeSeconds === undefined) {
+            lLastTimeSeconds = pTimeStamp;
+            lDeltaTimeSeconds = 0;
+        } else {
+            lDeltaTimeSeconds = pTimeStamp - lLastTimeSeconds;
+            lLastTimeSeconds = pTimeStamp;
+        }
+
+        while (lDeltaTimeSeconds > 0) {
+            pFunction(lDeltaTimeSeconds);
+            lDeltaTimeSeconds -= 0.16;
+        }
+        requestAnimationFrame(update);
+    }
+
+    requestAnimationFrame(update);
+
+    function lExit() {
+        lIsRunning = false;
+    }
+
+    return lExit;
+}
\ No newline at end of file
-- 
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