implement multithreaded rendering with context switch, gl state save/restore, add progress bar ui node, implement stencil texture for brush, implement multithreaded canvas load/save/export pano. Missing multithread in windows.

PanoPainter/GameViewController.m

@@ -12,6 +12,7 @@
 #include "app.h"
 
 @interface GameViewController () {
+    NSLock* gl_lock;
 }
 @property (strong, nonatomic) EAGLContext *context;
 
@@ -24,6 +25,21 @@ int t_count = 0;
 glm::vec2 t_pos;
 
 @implementation GameViewController
+- (void)async_lock
+{
+    [gl_lock lock];
+    [EAGLContext setCurrentContext:self.context];
+    GLKView* view = (GLKView*)self.view;
+    //[view bindDrawable];
+}
+- (void)async_unlock
+{
+    [gl_lock unlock];
+}
+- (void)async_swap
+{
+    [[EAGLContext currentContext] presentRenderbuffer:GL_RENDERBUFFER];
+}
 
 - (void)insertText:(NSString *)text
 {
@@ -84,9 +100,11 @@ glm::vec2 t_pos;
     frame.size.height -= kbSize.height;
     view.frame = frame;
 
+    [gl_lock lock];
     App::I.resize(frame.size.width * view.contentScaleFactor,
                   frame.size.height * view.contentScaleFactor);
     App::I.animate = false;
+    [gl_lock unlock];
 }
 
 // Called when the UIKeyboardWillHideNotification is sent
@@ -94,17 +112,21 @@ glm::vec2 t_pos;
 {
     CGRect frame = [[UIScreen mainScreen] bounds];
     self.view.frame = frame;
+    [gl_lock lock];
     App::I.resize(frame.size.width * self.view.contentScaleFactor,
                   frame.size.height * self.view.contentScaleFactor);
     App::I.animate = true;
+    [gl_lock unlock];
 }
 
 - (void)reset_touch
 {
+    [gl_lock lock];
     if (t_count == 2)
         App::I.gesture_end();
     else
         App::I.mouse_cancel(0);
+    [gl_lock unlock];
     t_count = 0;
 }
 
@@ -116,7 +138,9 @@ glm::vec2 t_pos;
     float scale = self.view.contentScaleFactor;
     
     kEventSource source = touch.type == UITouchType::UITouchTypeStylus ? kEventSource::Stylus : kEventSource::Touch;
+    [gl_lock lock];
     App::I.mouse_down(0, touchLocation.x * scale, touchLocation.y * scale, touch.force, source);
+    [gl_lock unlock];
     t_count = 1;
     t_pos = {touchLocation.x * scale, touchLocation.y * scale};
 }
@@ -139,6 +163,7 @@ glm::vec2 t_pos;
         p1 = glm::vec2(tl1.x * scale, tl1.y * scale);
     }
     
+    [gl_lock lock];
     if (n == 2)
     {
         if (t_count == 1)
@@ -167,6 +192,7 @@ glm::vec2 t_pos;
             App::I.mouse_move(touchLocation.x * scale, touchLocation.y * scale, force, source);
         }
     }
+    [gl_lock unlock];
     t_pos = {tl0.x * scale, tl0.y * scale};
 }
 -(void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
@@ -177,18 +203,23 @@ glm::vec2 t_pos;
 
     kEventSource source = touch.type == UITouchType::UITouchTypeStylus ? kEventSource::Stylus : kEventSource::Touch;
 
+    [gl_lock lock];
     if (t_count == 2)
         App::I.gesture_end();
     else
         App::I.mouse_up(0, touchLocation.x * scale, touchLocation.y * scale, source);
+    [gl_lock unlock];
+
     t_count = 0;
     t_pos = {touchLocation.x * scale, touchLocation.y * scale};
 }
 
 - (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
 {
+    [gl_lock lock];
     App::I.resize(size.width * self.view.contentScaleFactor,
                   size.height * self.view.contentScaleFactor);
+    [gl_lock unlock];
 }
 
 - (void)viewDidAppear:(BOOL)animated
@@ -211,9 +242,12 @@ glm::vec2 t_pos;
         NSLog(@"Failed to create ES context");
     }
     
+    gl_lock = [[NSLock alloc] init];
+    
     GLKView *view = (GLKView *)self.view;
     view.context = self.context;
     view.drawableDepthFormat = GLKViewDrawableDepthFormat24;
+    glview = view;
 
     App::I.width = view.frame.size.width * view.contentScaleFactor;
     App::I.height = view.frame.size.height * view.contentScaleFactor;
@@ -273,10 +307,18 @@ glm::vec2 t_pos;
 
 - (void)glkView:(GLKView *)view drawInRect:(CGRect)rect
 {
+    [gl_lock lock];
     if (!(App::I.redraw || App::I.animate))
+    {
+        [gl_lock unlock];
         return;
+    }
+    [EAGLContext setCurrentContext:self.context];
+    [view bindDrawable];
     App::I.clear();
     App::I.update(0);
+    //[self.context presentRenderbuffer:GL_FRAMEBUFFER];
+    [gl_lock unlock];
 }
 
 @end