Changes that silence the "Attribute 0 is disabled" warning in WebGL.

gistfile1.diff

diff --git
@@ -1,7 +1,8 @@
 var
     VERTEX_SHADER_SOURCE = ""+
+      "attribute vec4 a_Position;"+
       "void main() {"+
-      "  gl_Position = vec4(0.0, 0.0, 0.0, 1.0);"+
+      "  gl_Position = a_Position;"+
       "  gl_PointSize = 10.0;"+
       "}",
 
@@ -30,6 +31,19 @@
 gl.attachShader(shaderProgram, fragmentShader);
 gl.linkProgram(shaderProgram);
 gl.useProgram(shaderProgram);    
 
+// Create a buffer with vertex data:
+var vertices = new Float32Array([0.0, 0.0, 0.0]),
+    vertexBuffer = gl.createBuffer();
+gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
+gl.bufferData(gl.ARRAY_BUFFER, vertices, gl.STATIC_DRAW);
+
+// Bind position data to attribute 0.
+gl.bindAttribLocation(shaderProgram, 0, 'a_Position');
+
+// Assign pointer.
+gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);
+gl.enableVertexAttribArray(0);
+
 // Clear the canvas.
 gl.clearColor(0.0, 0.0, 0.0, 1.0);
 gl.clear(gl.COLOR_BUFFER_BIT);