/*

 *  File:       DZUtils.c

 *

 *  Copyright © 1996 Apple Computer, Inc.

 */

#include <assert.h>

#include <Resources.h>

#include <Types.h>

#include <QD3D.h>

#include <QD3DGroup.h>

#include <QD3DIO.h>

#include <QD3DStorage.h>

#include "DZUtils.h"

/*******************************************************************************

 *  CheckVersionNumber

 *

 *  Returns true if the given version number is compatible with (i. e not older

 *  than) version inMajor.inMinor.inBug.

 ******************************************************************************/

Boolean CheckVersionNumber(

    const NumVersion*       inVersion,

    UInt8                   inMajor,

    UInt8                   inMinor,

    UInt8                   inBug)

{

    if (inVersion->majorRev != inMajor)

    {

        return inVersion->majorRev > inMajor;

    }

    else

    {

        return inVersion->minorAndBugRev >= inMinor << 4 | inBug;

    }

}

/* =============================================================================

 *      Get3DMFResource (external)

 *

 *  Gets the '3DMF' resource with the given ID, and reads it using QD3D, and

 *  returns a reference to anything drawable in it.  NULL is returned if a

 *  problem occurs.

 * ========================================================================== */

TQ3Object Get3DMFResource(

    short               inResourceID)

{

    Handle              resource;

    TQ3Object           result;

    TQ3Object           object;

    TQ3Object           group;

    TQ3StorageObject    storage;

    TQ3FileObject       file;

    TQ3FileMode         mode;

    resource    = NULL;

    result      = NULL;

    object      = NULL;

    group       = NULL;

    storage     = NULL;

    file        = NULL;

    // Grab the resource

    resource = GetResource('3DMF', inResourceID);

    if (resource == NULL || ResError() != noErr)  goto bail;

    // Set up for reading

    storage = Q3HandleStorage_New(resource, GetHandleSize(resource));

    if (storage == NULL)  goto bail;

    file = Q3File_New();

    if (file == NULL)  goto bail;

    if (Q3File_SetStorage(file, storage) != kQ3Success)  goto bail;

    if (Q3File_OpenRead(file, &mode) != kQ3Success)  goto bail;

    // Read the objects

    group = NULL;

    while (!Q3File_IsEndOfFile(file))

    {

        object = Q3File_ReadObject(file);

        if (object != NULL)

        {

            if (Q3Object_IsDrawable(object))

            {

                if (result == NULL)

                {

                    // This is the first object

                    result = Q3Shared_GetReference(object);

                }

                else

                {

                    // Make sure we have a group to add it to

                    if (group == NULL)

                    {

                        // Create the new group

                        group = Q3DisplayGroup_New();

                        Q3Group_AddObject(group, result);

                        Q3Object_Dispose(result);

                        result = Q3Shared_GetReference(group);

                    }

                    // Add it to the group

                    assert(group == result);

                    Q3Group_AddObject(result, object);

                }

            }

            Q3Object_Dispose(object);

            object = NULL;

        }

    }

    // Get rid of the group reference

    if (group != NULL)

    {

        Q3Object_Dispose(group);

        group = NULL;

    }

    // Finish reading

    Q3File_Close(file);

    Q3Object_Dispose(file);

    file = NULL;

    Q3Object_Dispose(storage);

    storage = NULL;

    // Release the resource

    ReleaseResource(resource);

    return result;

    // Error exit

    bail:

    if (resource != NULL)

    {

        ReleaseResource(resource);

        resource = NULL;

    }

    if (result != NULL)

    {

        Q3Object_Dispose(result);

        result = NULL;

    }

    if (object != NULL)

    {

        Q3Object_Dispose(object);

        object = NULL;

    }

    if (group != NULL)

    {

        Q3Object_Dispose(group);

        group = NULL;

    }

    if (result != NULL)

    {

        Q3Object_Dispose(result);

        result = NULL;

    }

    if (storage != NULL)

    {

        Q3Object_Dispose(storage);

        storage = NULL;

    }

    if (file != NULL)

    {

        Q3Object_Dispose(file);

        file = NULL;

    }

    return NULL;

}