/*
 * DemoViewController.m
 *
 * Copyright (c) 2015-2023 The Brenwill Workshop Ltd. (http://www.brenwill.com)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#import "DemoViewController.h"

#include <MoltenVK/mvk_vulkan.h>
#include "../../Vulkan-Tools/cube/cube.c"


#pragma mark -
#pragma mark DemoViewController

@implementation DemoViewController {
	CADisplayLink* _displayLink;
	struct demo demo;
}

/** Since this is a single-view app, initialize Vulkan as view is appearing. */
-(void) viewWillAppear: (BOOL) animated {
	[super viewWillAppear: animated];

	self.view.contentScaleFactor = UIScreen.mainScreen.nativeScale;

#if TARGET_OS_SIMULATOR
	// Avoid linear host-coherent texture loading on simulator
	const char* argv[] = { "cube", "--use_staging" };
#else
	const char* argv[] = { "cube" };
#endif
	int argc = sizeof(argv)/sizeof(char*);
	demo_main(&demo, self.view.layer, argc, argv);
	demo_draw(&demo);

	uint32_t fps = 60;
	_displayLink = [CADisplayLink displayLinkWithTarget: self selector: @selector(renderLoop)];
	[_displayLink setFrameInterval: 60 / fps];
	[_displayLink addToRunLoop: NSRunLoop.currentRunLoop forMode: NSDefaultRunLoopMode];
}

-(void) renderLoop {
	demo_draw(&demo);
}

// Allow device rotation to resize the swapchain
-(void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id)coordinator {
	[super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
	demo_resize(&demo);
}

-(void) viewDidDisappear: (BOOL) animated {
	[_displayLink invalidate];
	[_displayLink release];
	demo_cleanup(&demo);
	[super viewDidDisappear: animated];
}

@end


#pragma mark -
#pragma mark DemoView

@implementation DemoView

/** Returns a Metal-compatible layer. */
+(Class) layerClass { return [CAMetalLayer class]; }

@end