/*

 *  main.c

 *  OpenGL Image

 *

 *  Created by ggs on Fri May 11 2001.

    Copyright:  Copyright © 2001 Apple Computer, Inc., All Rights Reserved

    Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.

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                please do not use, install, modify or redistribute this Apple software.

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                PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

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 *

 */

 // Note:  The interface code in this file, while very reasonable, is not designed to be production quality.  It is design to support this particular sample.

 //        The code of interest for this particular sample is contained in the files: OpenGL_Image_Utilities.h and OpenGL_Image_Utilities.c

#ifdef __APPLE_CC__

    #include <Carbon/Carbon.h>

#else

    #include <CarbonEvents.h> 

    #include <IBCarbonRuntime.h>

    #include <Debugging.h>

    #include <Gestalt.h>

#endif

#include "OpenGL_Image.h"

#include "Carbon_Error_Handler.h"

// ==================================

enum

{

    kFileMenu = 400,

    kCloseItem = 2,

    kImageMenu = 501,

    kRotateitem = 9,

    kInfoItem = 11,

    kLineItem,

    kGridItem

};

EventHandlerUPP gEvtHandler;            // main event handler

EventHandlerUPP gWinEvtHandler;         // window event handler

float gZoomFactor = 1.1f;

long gWindowCount = 0;

// ==================================

    static Boolean IsMacOSX (void);

    static void HandleWindowUpdate(WindowRef window);

    static pascal OSStatus myWindowEvtHndlr (EventHandlerCallRef myHandler, EventRef event, void* userData);

    pascal void IdleTimer (EventLoopTimerRef inTimer, void* userData);

    EventLoopTimerUPP GetTimerUPP (void);

    static pascal OSStatus myEvtHndlr (EventHandlerCallRef myHandler, EventRef event, void* userData);

// ==================================

// determine via gestalt if we are running on Mac OS X

static Boolean IsMacOSX (void)

{

    UInt32 response;

    if ((Gestalt (gestaltSystemVersion, (SInt32 *) &response) == noErr) && (response >= 0x01000))

        return true;

    else

        return false;

}

// ---------------------------------

// sets up ports fro all window update functions passingthe window ref on to the draing function

static void HandleWindowUpdate(WindowRef window)

{

    DrawGL (window); // draw content

}

// ---------------------------------

// per window event handler, userData will contain WindowRef for window that event is for

static pascal OSStatus myWindowEvtHndlr (EventHandlerCallRef myHandler, EventRef event, void* userData)

{

#pragma unused (myHandler)

    WindowRef           window = (WindowRef) userData;

    OSStatus            result = eventNotHandledErr;

    if (GetEventKind(event) == kEventWindowDrawContent)

    {

        GetEventParameter (event, kEventParamDirectObject, typeWindowRef, NULL, sizeof(WindowRef), NULL, &window);

        HandleWindowUpdate(window);

        result = noErr;

    }

    else if (GetEventKind(event) == kEventWindowClose)

    {

        pRecImage pWindowInfo = NULL;

        if (window)

        {

            pWindowInfo = (pRecImage) GetWRefCon (window);

            if ((pWindowInfo) && (pWindowInfo->spinning))

                StopRotation (window);

            DisposeGLForWindow (window);

            DisposeWindow (window);

            window = NULL;

            gWindowCount--;

            if (gWindowCount <= 0)

            {

                DisableMenuItem (GetMenuHandle (kImageMenu), 0);

                DisableMenuItem (GetMenuHandle (kFileMenu), kCloseItem);

                InvalMenuBar ();

            }

        }

        result = noErr;

    }

    else if (GetEventKind(event) == kEventWindowShowing)

    {

        result = BuildGLForWindow (window);

    }

    else if ((GetEventKind(event) == kEventWindowResizeCompleted) || (GetEventKind(event) == kEventWindowDragCompleted))

    {

        result = ResizeMoveGLWindow (window);

    }

    else if (GetEventKind(event) == kEventMouseUp)

    {

        Point dragPoint;

        GetEventParameter(event, kEventParamMouseLocation, typeQDPoint, NULL, sizeof(Point), NULL, &dragPoint);

        MouseUpGLWindow ();

    }

    else if (GetEventKind(event) == kEventMouseDown)

    {

        Point dragPoint;

        UInt32 modifiers;

        GetEventParameter(event, kEventParamMouseLocation, typeQDPoint, NULL, sizeof(Point), NULL, &dragPoint);

        GetEventParameter(event, kEventParamKeyModifiers, typeUInt32, NULL, sizeof(UInt32), NULL, &modifiers);

        MouseDownGLWindow (window, dragPoint, modifiers);

    }

    else if (GetEventKind(event) == kEventMouseDragged)

    {

        Point dragPoint;

        GetEventParameter(event, kEventParamMouseLocation, typeQDPoint, NULL, sizeof(Point), NULL, &dragPoint);

        DragGLWindow (dragPoint);

    }

    else if (GetEventKind(event) == kEventWindowZoomed)

    {

        ResizeMoveGLWindow (window);

    }

    return result;

}

// ---------------------------------

// application event handler, handles menu items for the most part

static pascal OSStatus myEvtHndlr (EventHandlerCallRef myHandler, EventRef event, void* userData)

{

#pragma unused (myHandler, userData)

    OSStatus result = eventNotHandledErr;

    EventHandlerRef ref;

    EventTypeSpec   list[] = { { kEventClassWindow, kEventWindowShowing },

                               { kEventClassWindow, kEventWindowClose },

                               { kEventClassWindow, kEventWindowDrawContent },

                               { kEventClassMouse, kEventMouseUp },

                               { kEventClassMouse, kEventMouseDown },

                               { kEventClassMouse, kEventMouseDragged },

                               { kEventClassWindow, kEventWindowResizeCompleted },

                               { kEventClassWindow, kEventWindowDragCompleted },

                               { kEventClassWindow, kEventWindowZoomed} };

    if (GetEventKind(event) == kEventMenuOpening)

    {

        pRecImage pWindowInfo = NULL;

        WindowRef window = FrontWindow ();

        if (window)

        {

            pWindowInfo = (pRecImage) GetWRefCon (window);

            if (pWindowInfo)

            {

                CheckMenuItem(GetMenuHandle (kImageMenu), kRotateitem, pWindowInfo->spinning);

                CheckMenuItem(GetMenuHandle (kImageMenu), kLineItem, pWindowInfo->lines);

                CheckMenuItem(GetMenuHandle (kImageMenu), kInfoItem, pWindowInfo->info);

                CheckMenuItem(GetMenuHandle (kImageMenu), kGridItem, pWindowInfo->grid);

            }

        }

    }

    else if (GetEventKind(event) == kEventProcessCommand)

    {

        HICommand command;

        Rect rectPort;

        pRecImage pWindowInfo = NULL;

        WindowRef window = FrontWindow ();

        if (window)

        {

            GetWindowPortBounds (window, &rectPort);

            pWindowInfo = (pRecImage) GetWRefCon (window);

        }

        GetEventParameter (event, kEventParamDirectObject, kEventParamHICommand, NULL, sizeof(command), NULL, &command);

        if (command.commandID == 'opnf')

        {

            IBNibRef nibRef;

            pWindowInfo = (recImage *) NewPtrClear (sizeof (recImage));

            if (LoadImageForRecImage (pWindowInfo))

            {

                if (IsMacOSX ())

                    result = CreateNibReference (CFSTR ("main X"), &nibRef);

                else

                    result = CreateNibReference (CFSTR ("main 9"), &nibRef);

                if (noErr == result)

                    result = CreateWindowFromNib (nibRef, CFSTR ("MainWindow"), &window);

                if ((window) && (noErr == result))

                {

                    SetWRefCon (window, (long) pWindowInfo);

                    InstallWindowEventHandler (window, gWinEvtHandler, GetEventTypeCount (list), list, (void*) window, &ref);

                    if (noErr != BuildGLForWindow (window))

                    {

                        DisposeGLForWindow (window);

                        DisposeWindow (window);

                    }

                    else

                    {

                        SetWTitle (window, pWindowInfo->name);

                        ShowWindow (window);

                        gWindowCount++;

                        if (gWindowCount > 0)

                        {

                            EnableMenuItem (GetMenuHandle (kImageMenu), 0);

                            EnableMenuItem (GetMenuHandle (kFileMenu), kCloseItem);

                            InvalMenuBar ();

                        }

                    }

                }

            }

        }

        else if (command.commandID == 'clsf')

        {

            if (window)

            {

                pWindowInfo = (pRecImage) GetWRefCon (window);

                if ((pWindowInfo) && (pWindowInfo->spinning))

                    StopRotation (window);

                DisposeGLForWindow (window);

                DisposeWindow (window);

                window = NULL;

                gWindowCount--;

                if (gWindowCount <= 0)

                {

                    DisableMenuItem (GetMenuHandle (kImageMenu), 0);

                    DisableMenuItem (GetMenuHandle (kFileMenu), kCloseItem);

                    InvalMenuBar ();

                }

            }

        }

        else if (pWindowInfo)

        {

            switch (command.commandID)

            {

                case 'zmin':

                    pWindowInfo->zoom *= gZoomFactor;

                    pWindowInfo->centerX *= gZoomFactor;

                    pWindowInfo->centerY *= gZoomFactor;

                    GetWindowPortBounds (window, &rectPort);

                    InvalWindowRect (window, &rectPort);

                    result = noErr;

                    break;

                case 'zout':

                    pWindowInfo->zoom /= gZoomFactor;

                    pWindowInfo->centerX /= gZoomFactor;

                    pWindowInfo->centerY /= gZoomFactor;

                    GetWindowPortBounds (window, &rectPort);

                    InvalWindowRect (window, &rectPort);

                    result = noErr;

                    break;

                case 'zwin':

                    {

                        float ztemp2 = (float) (rectPort.right - rectPort.left) / (float) pWindowInfo->imageWidth;

                        float ztemp1 = (float) (rectPort.bottom - rectPort.top) / (float) pWindowInfo->imageHeight;

                        if (ztemp2 < ztemp1)

                            pWindowInfo->zoom = ztemp2;

                        else

                            pWindowInfo->zoom = ztemp1;

                    }

                    pWindowInfo->centerX = (float) 0.0;

                    pWindowInfo->centerY = (float) 0.0;

                    pWindowInfo->rotation = (float) 0.0;

                    GetWindowPortBounds (window, &rectPort);

                    InvalWindowRect (window, &rectPort);

                    result = noErr;

                    break;

                case 'zt11':

                    pWindowInfo->centerX /= pWindowInfo->zoom;

                    pWindowInfo->centerY /= pWindowInfo->zoom;

                    pWindowInfo->zoom = (float) 1.0;

                    GetWindowPortBounds (window, &rectPort);

                    InvalWindowRect (window, &rectPort);

                    result = noErr;

                    break;

                case 'tlin':

                    pWindowInfo->lines = (unsigned char) (1 - pWindowInfo->lines);

                    GetWindowPortBounds (window, &rectPort);

                    InvalWindowRect (window, &rectPort);

                    result = noErr;

                    break;

                case 'tinf':

                    pWindowInfo->info = (unsigned char) (1 - pWindowInfo->info);

                    GetWindowPortBounds (window, &rectPort);

                    InvalWindowRect (window, &rectPort);

                    result = noErr;

                    break;

                case 'grid':

                    pWindowInfo->grid = (unsigned char) (1 - pWindowInfo->grid);

                    GetWindowPortBounds (window, &rectPort);

                    InvalWindowRect (window, &rectPort);

                    result = noErr;

                    break;

                case 'rocw':

                    pWindowInfo->rotation += 90.0;

                    while (pWindowInfo->rotation >= 360.0) pWindowInfo->rotation -= 360.0; // ensure within -360 to 360

                    while (pWindowInfo->rotation <= -360.0) pWindowInfo->rotation += 360.0;

                    GetWindowPortBounds (window, &rectPort);

                    InvalWindowRect (window, &rectPort);

                    result = noErr;

                    break;

                case 'rccw':

                    pWindowInfo->rotation -= 90.0;

                    while (pWindowInfo->rotation >= 360.0) pWindowInfo->rotation -= 360.0; // ensure within -360 to 360

                    while (pWindowInfo->rotation <= -360.0) pWindowInfo->rotation += 360.0;

                    GetWindowPortBounds (window, &rectPort);

                    InvalWindowRect (window, &rectPort);

                    result = noErr;

                    break;

                case 'rot0':

                    pWindowInfo->rotation = (float) 0.0;

                    GetWindowPortBounds (window, &rectPort);

                    InvalWindowRect (window, &rectPort);

                    result = noErr;

                    break;

                case 'spin':

                    pWindowInfo->spinning = (unsigned char) (1 - pWindowInfo->spinning);

                    if (pWindowInfo->spinning)

                        StartRotation (window);

                    else

                        StopRotation (window);

                    result = noErr;

                    break;

            }

        }

    }

    return result;

}

// ==================================

// application main

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

{

#pragma unused (argc, argv)

    IBNibRef        nibRef;

    OSStatus        err;

    EventHandlerRef ref;

    EventTypeSpec   list[] = { { kEventClassCommand,  kEventProcessCommand },

                               { kEventClassMenu,  kEventMenuOpening } };

    // Create a Nib reference passing the name of the nib file (without the .nib extension)

    // CreateNibReference only searches into the application bundle.

    if (IsMacOSX ())

        err = CreateNibReference (CFSTR("main X"), &nibRef);

    else

        err = CreateNibReference (CFSTR("main 9"), &nibRef);

    require_noerr( err, CantGetNibRef );

    // Once the nib reference is created, set the menu bar. "MainMenu" is the name of the menu bar

    // object. This name is set in InterfaceBuilder when the nib is created.

    err = SetMenuBarFromNib(nibRef, CFSTR("MainMenu"));

    require_noerr( err, CantSetMenuBar );

    DisableMenuItem (GetMenuHandle (kImageMenu), 0);

    DisableMenuItem (GetMenuHandle (kFileMenu), kCloseItem);

    InvalMenuBar ();

    gEvtHandler = NewEventHandlerUPP(myEvtHndlr);

    InstallApplicationEventHandler (gEvtHandler, GetEventTypeCount (list), list, 0, &ref);

    gWinEvtHandler = NewEventHandlerUPP(myWindowEvtHndlr);

    // We don't need the nib reference anymore.

    DisposeNibReference(nibRef);

    // Call the event loop

    RunApplicationEventLoop();

CantSetMenuBar:

CantGetNibRef:

    return err;

}