/*

    Copyright (C) 2016 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    View Controller for the iOS version of MetalBasicTessellation.

            The UI elements that can modify a tessellation pass are: a segmented control to select a patch type, a switch to enable/disable wireframe rendering, sliders to change the edge and inside tessellation factors.

            The MTKView's drawing loop is only executed when the view appears, when it receives a view notification (setNeedsDisplay methods), or when its draw method is explicitly called (IBAction receiver methods).

            The MTKView's delegate methods are contained in the TessellationPipeline class.

 */

#import <MetalKit/MetalKit.h>

#import "AAPLViewController.h"

#import "AAPLTessellationPipeline.h"

@interface AAPLViewController ()

@property (weak, nonatomic) IBOutlet MTKView *mtkView;

@property (weak, nonatomic) IBOutlet UILabel *edgeLabel;

@property (weak, nonatomic) IBOutlet UILabel *insideLabel;

@property (strong, nonatomic) AAPLTessellationPipeline* tessellationPipeline;

@end

@implementation AAPLViewController

#pragma mark ViewController setup methods

- (void)viewDidLoad

{

    [super viewDidLoad];

    self.mtkView.paused = YES;

    self.mtkView.enableSetNeedsDisplay = YES;

    self.mtkView.sampleCount = 4;

}

- (void)viewDidAppear:(BOOL)animated

{

    [super viewDidAppear:animated];

    self.tessellationPipeline = [[AAPLTessellationPipeline alloc] initWithMTKView:self.mtkView];

    [self.mtkView draw];

}

#pragma mark IBAction receiver methods

- (IBAction)patchTypeSegmentedControlDidChange:(UISegmentedControl *)sender {

    self.tessellationPipeline.patchType = (sender.selectedSegmentIndex == 0) ? MTLPatchTypeTriangle : MTLPatchTypeQuad;

    [self.mtkView draw];

}

- (IBAction)wireframeDidChange:(UISwitch *)sender {

    self.tessellationPipeline.wireframe = sender.on;

    [self.mtkView draw];

}

- (IBAction)edgeSliderDidChange:(UISlider *)sender {

    self.edgeLabel.text = [NSString stringWithFormat:@"%.1f", sender.value];

    self.tessellationPipeline.edgeFactor = sender.value;

    [self.mtkView draw];

}

- (IBAction)insideSliderDidChange:(UISlider *)sender {

    self.insideLabel.text = [NSString stringWithFormat:@"%.1f", sender.value];

    self.tessellationPipeline.insideFactor = sender.value;

    [self.mtkView draw];

}

@end