Use correct rendering order..

client/webgl_draw.js

@@ -73,6 +73,8 @@ function draw(state, context) {
         if (static_points > 0) {
             // DEPTH PREPASS
 
+            index_buffer.reverse();
+
             if (context.do_prepass) {
                 gl.drawBuffers([gl.NONE]);
 
@@ -94,11 +96,9 @@ function draw(state, context) {
                 gl.vertexAttribIPointer(locations['a_stroke_id'], 1, gl.INT,                  config.bytes_per_point, 4 * 3 + 4 * 4 + 4);
 
                 gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, index_buffer, gl.DYNAMIC_DRAW);
-
                 gl.drawElements(gl.TRIANGLES, index_count, gl.UNSIGNED_INT, 0);
             }
 
-            index_buffer.reverse();
 
             // MAIN PASS
             gl.drawBuffers([gl.BACK]);