/*

 Copyright (C) 2015-2016 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Utility class for rendering (encoding into Metal pipeline components of) N-Body simulation and presenting the frame

 */

#import <simd/simd.h>

#import <QuartzCore/CAMetalLayer.h>

#import <Metal/Metal.h>

@interface MetalNBodyPresenter : NSObject

// Aspect ratio

@property (nonatomic) float aspect;

// Orthographic projection configuration type

@property (nonatomic) uint32_t config;

// Update the linear transformation mvp matrix

@property (nonatomic) BOOL update;

// N-body simulation global parameters

@property (nullable, nonatomic) NSDictionary* globals;

// N-body parameters for simulation types

@property (nullable, nonatomic) NSDictionary* parameters;

// Host pointers

@property (nullable, nonatomic, readonly) simd::float4* position;

@property (nullable, nonatomic, readonly) simd::float4* velocity;

@property (nullable, nonatomic, readonly) simd::float4* colors;

// Query to determine if all the resources are instantiated for render encoder object

@property (readonly) BOOL haveEncoder;

// Query to determine if all stages are encoded

@property (readonly) BOOL isEncoded;

// Generate all the resources (including fragment, vertex and compute stages)

// for rendering N-Body simulation

@property (nullable, nonatomic, setter=acquire:) id<MTLDevice> device;

// Encode vertex, fragment, and compute stages, then present the drawable

@property (nullable, nonatomic, setter=encode:) id<CAMetalDrawable> drawable;

// Wait until the render encoding is complete

- (void) finish;

@end