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/shader.js | 60 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 frontend/_rigidbody/shader.js

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

diff --git a/frontend/_rigidbody/shader.js b/frontend/_rigidbody/shader.js
new file mode 100644
index 0000000..bf08638
--- /dev/null
+++ b/frontend/_rigidbody/shader.js
@@ -0,0 +1,60 @@
+function loadShader(pGl, pShaderType, pShaderSource) {
+    const lShader = pGl.createShader(pShaderType);
+    pGl.shaderSource(lShader, pShaderSource);
+    pGl.compileShader(lShader);
+    if (!pGl.getShaderParameter(lShader, pGl.COMPILE_STATUS)) {
+      alert('An error occurred compiling the shaders: ' + pGl.getShaderInfoLog(lShader));
+      pGl.deleteShader(lShader);
+      return null;
+    }
+  
+    return lShader;
+}
+
+function loadOrthographicShader(pGl) {
+    var lVertex, lFragment;
+
+    function lLoadShaders() {
+        const lVertexShader = loadShader(pGl, pGl.VERTEX_SHADER, lVertex);
+        const lFragmentShader = loadShader(pGl, pGl.FRAGMENT_SHADER, lFragment);
+
+        const lShaderProgram = pGl.createProgram();
+        pGl.attachShader(lShaderProgram, lVertexShader);
+        pGl.attachShader(lShaderProgram, lFragmentShader);
+        pGl.linkProgram(lShaderProgram);
+
+        if (!pGl.getProgramParameter(lShaderProgram, pGl.LINK_STATUS)) {
+            alert('Unable to initialize the shader program: ' + pGl.getProgramInfoLog(lShaderProgram));
+            return null;
+        }
+
+        return {
+            program: lShaderProgram,
+            attributeLocations: {
+                position: pGl.getAttribLocation(lShaderProgram, 'position'),
+                color: pGl.getAttribLocation(lShaderProgram, 'color')
+            },
+            uniformLocations: {
+                projection: pGl.getUniformLocation(lShaderProgram, 'projection'),
+                model: pGl.getUniformLocation(lShaderProgram, 'model')
+            }
+        }
+    }
+
+    return fetch('/_rigidbody/shaders/orthographic.vert').then(function(pResponse) {
+        if (pResponse.status === 200) {
+            return pResponse.text().then(function(pShader) {
+                lVertex = pShader;
+
+                return fetch('/_rigidbody/shaders/orthographic.frag').then(function(pResponse) {
+                    if (pResponse.status === 200) {
+                        return pResponse.text().then(function(pShader) {
+                            lFragment = pShader;
+                            return lLoadShaders();
+                        });
+                    }
+                });
+            });
+        }
+    });
+}
\ No newline at end of file
-- 
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