add file picking for osx and ios and implement equirectangular import

PanoPainter/GameViewController.h

@@ -9,7 +9,7 @@
 #import <UIKit/UIKit.h>
 #import <GLKit/GLKit.h>
 
-@interface GameViewController : GLKViewController <UIKeyInput>
+@interface GameViewController : GLKViewController <UIKeyInput,UIImagePickerControllerDelegate,UINavigationControllerDelegate>
 {
 @public GLKView* glview;
 }
@@ -17,5 +17,7 @@
 - (void)async_lock;
 - (void)async_unlock;
 - (void)async_swap;
-
+- (void)pick_photo:(std::function<void(std::string)>) callback;
+- (void)registerForKeyboardNotifications;
+- (void)unregisterForKeyboardNotifications;
 @end

PanoPainter/GameViewController.m

@@ -11,6 +11,15 @@
 #import <OpenGLES/ES3/glext.h>
 #include "app.h"
 
+@interface GameImagePicker : UIImagePickerController
+{
+    @public std::promise<std::string> promise;
+    @public std::function<void(std::string)> callback;
+}
+@end
+@implementation GameImagePicker
+@end
+
 @interface GameViewController () {
     NSLock* gl_lock;
 }
@@ -48,6 +57,33 @@ NSThread* lock_thread;
     [self.context presentRenderbuffer:GL_RENDERBUFFER];
 }
 
+- (void)pick_photo:(std::function<void(std::string)>) callback
+{
+    GameImagePicker *picker = [[GameImagePicker alloc] init];
+    picker.delegate = self;
+    picker.allowsEditing = NO;
+    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
+    picker->callback = callback;
+    [self presentViewController:picker animated:YES completion:NULL];
+}
+
+- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
+{
+    NSString *chosenImage = [info[UIImagePickerControllerImageURL] path];
+    GameImagePicker* p = static_cast<GameImagePicker*>(picker);
+    std::string path = [chosenImage cStringUsingEncoding:NSUTF8StringEncoding];
+    p->callback(path);
+    [picker dismissViewControllerAnimated:YES completion:^{
+                    [self keyboardWillBeHidden:nil];
+                }];
+}
+- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
+{
+    [picker dismissViewControllerAnimated:YES completion:^{
+                    [self keyboardWillBeHidden:nil];
+                }];
+}
+
 - (void)insertText:(NSString *)text
 {
     if (const char* cstr = [text cStringUsingEncoding:NSASCIIStringEncoding])
@@ -84,6 +120,18 @@ NSThread* lock_thread;
                                              selector:@selector(keyboardWasHidden:)
                                                  name:UIKeyboardDidHideNotification object:nil];
 }
+- (void)unregisterForKeyboardNotifications
+{
+    [[NSNotificationCenter defaultCenter] removeObserver:self
+                                                 name:UIKeyboardWillShowNotification object:nil];
+    [[NSNotificationCenter defaultCenter] removeObserver:self
+                                                 name:UIKeyboardWillHideNotification object:nil];
+
+    [[NSNotificationCenter defaultCenter] removeObserver:self
+                                                 name:UIKeyboardDidShowNotification object:nil];
+    [[NSNotificationCenter defaultCenter] removeObserver:self
+                                                 name:UIKeyboardDidHideNotification object:nil];
+}
 
 - (void)keyboardWillBeShown:(NSNotification*)aNotification
 {
@@ -94,6 +142,7 @@ NSThread* lock_thread;
 {
     App::I.redraw = true;
     App::I.animate = false;
+    [self unregisterForKeyboardNotifications];
 }
 
 // Called when the UIKeyboardDidShowNotification is sent.
@@ -233,7 +282,7 @@ NSThread* lock_thread;
 {
     App::I.redraw = true;
     [self resignFirstResponder];
-    [self registerForKeyboardNotifications];
+    //[self registerForKeyboardNotifications];
 }
 
 - (void)viewDidLoad