From 376e1a7f9207fffb1ec3027ac1e7f32db5de4922 Mon Sep 17 00:00:00 2001
From: Matthew Kosarek <mattkae@protonmail.com>
Date: Sat, 6 Feb 2021 18:39:48 -0500
Subject: Initial commit

---
 frontend/_rigidbody/rigidbody_2.js | 78 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 frontend/_rigidbody/rigidbody_2.js

(limited to 'frontend/_rigidbody/rigidbody_2.js')

diff --git a/frontend/_rigidbody/rigidbody_2.js b/frontend/_rigidbody/rigidbody_2.js
new file mode 100644
index 0000000..b41fa92
--- /dev/null
+++ b/frontend/_rigidbody/rigidbody_2.js
@@ -0,0 +1,78 @@
+/// <reference path="../scripts/jquery-3.5.1.min.js"/>
+/// <reference path="vec2.js" />
+/// <reference path="mat4.js" />
+/// <reference path="shader.js" />
+/// <reference path="circle.js" />
+
+function main() {
+    // Define Constants
+    const CIRCLE_RADIUS = 16;
+    const GRAVITY = 9.8;
+
+    // Retrieve context
+    const lProgramContext = getContext('#rigidbody_2');
+
+    if (lProgramContext.gl === null) {
+        console.error('Unable to initialize WebGL. Your browser or machine may not support it.');
+        return;
+    }
+
+    lProgramContext.gl.clearColor(0.0, 0.0, 0.0, 1.0);
+    lProgramContext.gl.clear(lProgramContext.gl.COLOR_BUFFER_BIT);
+
+    function run() {
+        console.log('Running Rigid Body 2');
+        lProgramContext.load().then(function(pProgramInfo) {
+            const lCircle = circle(lProgramContext.gl, CIRCLE_RADIUS, 30, [
+                { x: 1, y: 1, z: 0, w: 1 },
+                { x: 1, y: 0, z: 1, w: 1 },
+                { x: 0, y: 1, z: 1, w: 1 },
+                { x: 0, y: 1, z: 0, w: 1 }
+            ], vec2(lProgramContext.width / 2.0, lProgramContext.height / 2.0));
+
+            function update(pDeltaTimeSeconds) {
+                // Same physics updates from previously
+                const lGravityForce = vec2(0, -1.0 * (lCircle.mass * GRAVITY));
+                lCircle.force = addVec2(lCircle.force, lGravityForce);
+                const lCurrentAcceleration = scaleVec2(lCircle.force, 1.0 / lCircle.mass);
+                lCircle.velocity = addVec2(lCircle.velocity, scaleVec2(lCurrentAcceleration, pDeltaTimeSeconds));
+                lCircle.position = addVec2(lCircle.position, scaleVec2(lCircle.velocity, pDeltaTimeSeconds));
+                lCircle.rotationRadians += Math.PI * pDeltaTimeSeconds;
+                lCircle.model = rotateMatrix2d(translateMatrix(mat4(), lCircle.position.x, lCircle.position.y, 0), lCircle.rotationRadians);
+                lCircle.force = vec2();
+
+                // Render Code only
+                lProgramContext.gl.clearColor(0.0, 0.0, 0.0, 1.0);
+                lProgramContext.gl.clearDepth(1.0);
+                lProgramContext.gl.enable(lProgramContext.gl.DEPTH_TEST);
+                lProgramContext.gl.depthFunc(lProgramContext.gl.LEQUAL);
+                lProgramContext.gl.clear(lProgramContext.gl.COLOR_BUFFER_BIT | lProgramContext.gl.DEPTH_BUFFER_BIT);
+
+                lProgramContext.gl.useProgram(pProgramInfo.program);
+                lProgramContext.gl.uniformMatrix4fv(pProgramInfo.uniformLocations.projection, false, lProgramContext.perspective);
+                lProgramContext.gl.uniformMatrix4fv(pProgramInfo.uniformLocations.model, false, lCircle.model);
+
+                renderCircle(lProgramContext.gl, pProgramInfo, lCircle);
+            }
+
+            function cleanup() {
+                lProgramContext.gl.deleteBuffer(lCircle.buffer);
+                lProgramContext.gl.deleteProgram(pProgramInfo.program);
+                lProgramContext.gl.clearColor(0.0, 0.0, 0.0, 1.0);
+                lProgramContext.gl.clear(lProgramContext.gl.COLOR_BUFFER_BIT);
+            }
+
+            function reset() {
+                lExitRequestFunc();
+                lProgramContext.reset();
+            }
+
+            const lExitRequestFunc = requestUpdateLoop(update, cleanup);
+            lProgramContext.stopButton.on('click', reset);
+        });
+    }
+
+    lProgramContext.playButton.on('click', run);
+}
+
+$(document).ready(main);
\ No newline at end of file
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