Initial commit

1 files changed, 51 insertions, 0 deletions

diff --git a/lib/webgl_utils.js b/lib/webgl_utils.js
new file mode 100644
index 0000000..1386bf7
--- /dev/null
+++ b/lib/webgl_utils.js
@@ -0,0 +1,51 @@
+/**
+  * Initializes the WebGL Shader program
+  */
+export function initializeShaderProgram(gl, vertexShaderSource, fragmentShaderSource) {
+
+  const vertexShader = loadShader(gl, gl.VERTEX_SHADER, vertexShaderSource);
+  const fragmentShader = loadShader(gl, gl.FRAGMENT_SHADER, fragmentShaderSource);
+
+  const shaderProgram = gl.createProgram();
+  gl.attachShader(shaderProgram, vertexShader);
+  gl.attachShader(shaderProgram, fragmentShader);
+
+  gl.linkProgram(shaderProgram);
+
+  if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
+    console.error(`Unable to initialize shader program: ${gl.getProgramInfoLog(shaderProgram)}`);
+    return null;
+  }
+
+  return shaderProgram;
+}
+
+/**
+  * Initializes the buffers
+  */
+export function initializeBuffers(gl) {
+
+    const positionBuffer = gl.createBuffer();
+
+    gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
+
+    return {
+      position: positionBuffer
+    };
+  }
+
+
+function loadShader(gl, type, source) {
+
+  const shader = gl.createShader(type);
+  gl.shaderSource(shader, source);
+  gl.compileShader(shader);
+
+  if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
+    console.error(`Unable to compile shader: ${gl.getShaderInfoLog(shader)}`);
+    gl.deleteShader(shader);
+    return null;
+  }
+
+  return shader;
+}