attrib

index.html

@@ -11,8 +11,10 @@
 </body>
 
 <script id="vertex-shader" type="x-shader/x-vertex">
+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;
 }
 </script>

webgl.js

@@ -60,6 +60,15 @@ function main() {
 	];
 
 	program = buildShaderProgram(shaderSet);
+	
+	var a_Position = gl.getAttribLocation(program, 'a_Position');
+	if (a_Position < 0) {
+		console.log('couldnt get position');
+		return;
+	}
+
+	gl.vertexAttrib3f(a_Position, 0.0, 0.5, 0.0);
+
 	gl.useProgram(program);
 
 	gl.clearColor(0.5, 0.0, 0.0, 1.0);