main.mm

//

// File:       main.mm

//

// Abstract:   This example performs an NBody simulation which calculates a gravity field 

//             and corresponding velocity and acceleration contributions accumulated 

//             by each body in the system from every other body.  This example

//             also shows how to mitigate computation between all available devices

//             including CPU and GPU devices, as well as a hybrid combination of both,

//             using separate threads for each simulator.

//

// Version:    <1.0>

//

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// Copyright ( C ) 2008 Apple Inc. All Rights Reserved.

//

////////////////////////////////////////////////////////////////////////////////

#import <Cocoa/Cocoa.h>

#import "GalaxiesView.h"

#include "nbody.h"

#include <unistd.h>

#include <inttypes.h>

int main(int argc, const char *argv[])

{

    ProcessSerialNumber psn;

    GetCurrentProcess(&psn);

    TransformProcessType(&psn, kProcessTransformToForegroundApplication);

    SetFrontProcess(&psn);

    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    [NSApplication sharedApplication];

    chdir([[[NSBundle mainBundle] resourcePath] cStringUsingEncoding:NSUTF8StringEncoding]);

    [NSBundle loadNibNamed:@"MainMenu.nib" owner:NSApp];

    NSRect contentRect = [[NSScreen mainScreen] visibleFrame];

    NSRect frameRect = [NSWindow frameRectForContentRect:contentRect

                                               styleMask:NSTitledWindowMask];

    NSWindow *window = [[NSWindow alloc]

        initWithContentRect:frameRect

                  styleMask:NSTitledWindowMask

                    backing:NSBackingStoreRetained

                      defer:NO];

    [window setTitle:@"Galaxies"];

    NSOpenGLPixelFormatAttribute attributes[] =

    {

        NSOpenGLPFADoubleBuffer,

        NSOpenGLPFAAccelerated,

        NSOpenGLPFAAllowOfflineRenderers,   // NOTE: Needed to connect to secondary GPUs

        NSOpenGLPFADepthSize, 24,

        0

    };

    if (argc > 2) {

        fprintf(stderr, "Usage: Galaxies [num_particles]\n");

        return EXIT_FAILURE;

    } else if (argc == 2) {

        if(!strstr(argv[1], "-psn_"))

            SetParticleCount(strtol(argv[1], NULL, 10));

    }

    NSOpenGLPixelFormat *pixelFormat =

        [[NSOpenGLPixelFormat alloc] initWithAttributes:attributes];

    GalaxiesView *view = [[GalaxiesView alloc] initWithFrame:contentRect

                                                 pixelFormat:pixelFormat];

    [window setContentView:view];

    [window makeKeyAndOrderFront:nil];

    [NSApp run];

    [pool release];

    return EXIT_SUCCESS;

}