add free and poly selection mask tools, fix some threading gl problems

PanoPainter/GameViewController.m

@@ -35,7 +35,7 @@ NSThread* lock_thread;
     lock_count++;
     [EAGLContext setCurrentContext:self.context];
     GLKView* view = (GLKView*)self.view;
-    //[view bindDrawable];
+    [view bindDrawable];
 }
 - (void)async_unlock
 {
@@ -45,7 +45,7 @@ NSThread* lock_thread;
 }
 - (void)async_swap
 {
-    [[EAGLContext currentContext] presentRenderbuffer:GL_RENDERBUFFER];
+    [self.context presentRenderbuffer:GL_RENDERBUFFER];
 }
 
 - (void)insertText:(NSString *)text
@@ -317,6 +317,7 @@ NSThread* lock_thread;
     [gl_lock lock];
     if (!(App::I.redraw || App::I.animate))
     {
+        [self.context presentRenderbuffer:GL_FRAMEBUFFER];
         [gl_lock unlock];
         return;
     }
@@ -324,7 +325,7 @@ NSThread* lock_thread;
     [view bindDrawable];
     App::I.clear();
     App::I.update(0);
-    //[self.context presentRenderbuffer:GL_FRAMEBUFFER];
+    [self.context presentRenderbuffer:GL_FRAMEBUFFER];
     [gl_lock unlock];
 }