/*

    File: ClientController.m

Abstract: 

This class implements the controller object for the client application. It is 

responsible for looking up the server application, and responding to frame

rendering requests from the server.

 Version: 1.2

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*/

#import "ClientController.h"

#import "MultiGPUMig.h"

#import "MultiGPUMigServer.h"

#import "ClientOpenGLView.h"

@interface ClientController()

{

    IBOutlet NSWindow *_window;

    IBOutlet ClientOpenGLView *_view;

    IBOutlet NSPopUpButton *_rendererPopup;

    NSMachPort *serverPort;

    NSMachPort *localPort;

    uint32_t serverPortName;

    uint32_t localPortName;

    int32_t clientIndex;

    uint32_t nextFrameIndex;

    IOSurfaceRef _ioSurfaceBuffers[NUM_IOSURFACE_BUFFERS];

    GLuint _textureNames[NUM_IOSURFACE_BUFFERS];

    uint32_t rendererIndex;

}

@end

@implementation ClientController

- (void)applicationWillFinishLaunching:(NSNotification *)note

{

    [[NSNotificationCenter defaultCenter] addObserver:self 

        selector:@selector(portDied:) name:NSPortDidBecomeInvalidNotification object:nil];

    [_rendererPopup removeAllItems];

    [_rendererPopup addItemsWithTitles:[_view rendererNames]];

    // Slide slave window over a bit.

    NSRect windowFrame = [_window frame];

    windowFrame.origin.x += windowFrame.size.width + 32.0f;

    [_window setFrameOrigin:windowFrame.origin];        

    // Try to check in with master.

    serverPort = [(NSMachPort *)([[NSMachBootstrapServer sharedInstance] portForName:@"com.apple.MultiGPUServer"]) retain];

    if(serverPort)

    {

        // Create our own local port.

        localPort = [[NSMachPort alloc] init];

        // Retrieve raw mach port names.

        serverPortName = [serverPort machPort];

        localPortName  = [localPort machPort];

        // Register our local port with the current runloop.

        [localPort setDelegate:self];

        [localPort scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];

        // Check in with server.

        int kr;

        kr = _MGCCheckinClient(serverPortName, localPortName, &clientIndex);

        if(kr != 0)

            [NSApp terminate:nil];

    }

}

- (void)portDied:(NSNotification *)notification

{

    NSPort *port = [notification object];

    if(port == serverPort)

    {

        [NSApp terminate:self];

    }

}

- (void)handleMachMessage:(void *)msg

{

    union __ReplyUnion___MGCMGSServer_subsystem reply;

    mach_msg_header_t *reply_header = (void *)&reply;

    kern_return_t kr;

    if(MGSServer_server(msg, reply_header) && reply_header->msgh_remote_port != MACH_PORT_NULL)

    {

        kr = mach_msg(reply_header, MACH_SEND_MSG, reply_header->msgh_size, 0, MACH_PORT_NULL, 

                 0, MACH_PORT_NULL);

        if(kr != 0)

            [NSApp terminate:nil];

    }

}

- (kern_return_t)displayFrame:(int32_t)frameIndex surfaceid:(uint32_t)iosurface_id

{

    nextFrameIndex = frameIndex;

    if(!_ioSurfaceBuffers[frameIndex])

    {

        _ioSurfaceBuffers[frameIndex] = IOSurfaceLookup(iosurface_id);

    }

    if(!_textureNames[frameIndex])

        _textureNames[frameIndex] = [_view setupIOSurfaceTexture:_ioSurfaceBuffers[frameIndex]];

    [_view setNeedsDisplay:YES];

    [_view display];

    return 0;

}

// For the clients, this is a no-op.

kern_return_t _MGSCheckinClient(mach_port_t server_port, mach_port_t client_port,

                   int32_t *client_index)

{

    return 0;

}

kern_return_t _MGSDisplayFrame(mach_port_t server_port, int32_t frame_index, uint32_t iosurface_id)

{

    return [(ClientController *)[NSApp delegate] displayFrame:frame_index surfaceid:iosurface_id];

}

- (GLuint)currentTextureName

{

    return _textureNames[nextFrameIndex];

}

- (IBAction)setRenderer:(id)sender

{

    [_view setRendererIndex:(rendererIndex = [sender indexOfSelectedItem])];

}

@end