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

//

//  File: OpenGLIBOGeometry.m

//

//  Abstract: Utility class to deserialize a property list that describes

//            a IBO normals, vertices, colors, and texture coordinates.

//           

//  Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple

//  Computer, Inc. ("Apple") in consideration of your agreement to the

//  following terms, and your use, installation, modification or

//  redistribution of this Apple software constitutes acceptance of these

//  terms.  If you do not agree with these terms, please do not use,

//  install, modify or redistribute this Apple software.

//  

//  In consideration of your agreement to abide by the following terms, and

//  subject to these terms, Apple grants you a personal, non-exclusive

//  license, under Apple's copyrights in this original Apple software (the

//  "Apple Software"), to use, reproduce, modify and redistribute the Apple

//  Software, with or without modifications, in source and/or binary forms;

//  provided that if you redistribute the Apple Software in its entirety and

//  without modifications, you must retain this notice and the following

//  text and disclaimers in all such redistributions of the Apple Software. 

//  Neither the name, trademarks, service marks or logos of Apple Computer,

//  Inc. may be used to endorse or promote products derived from the Apple

//  Software without specific prior written permission from Apple.  Except

//  as expressly stated in this notice, no other rights or licenses, express

//  or implied, are granted by Apple herein, including but not limited to

//  any patent rights that may be infringed by your derivative works or by

//  other works in which the Apple Software may be incorporated.

//  

//  The Apple Software is provided by Apple on an "AS IS" basis.  APPLE

//  MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

//  THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS

//  FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND

//  OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

//  

//  IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL

//  OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

//  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

//  INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,

//  MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED

//  AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),

//  STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE

//  POSSIBILITY OF SUCH DAMAGE.

// 

//  Copyright (c) 2009 Apple Inc., All rights reserved.

//

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

#import "OpenGLIBOGeometry.h"

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

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

#pragma mark -

#pragma mark Private - Data Structures

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

struct OpenGLArray

{

    GLsizeiptr   count;

    GLsizeiptr   size;

    GLfloat     *values;

};

typedef struct OpenGLArray   OpenGLArray;

typedef struct OpenGLArray  *OpenGLArrayRef;

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

struct OpenGLIBOGeometryData

{

    GLsizeiptr      count;

    GLsizeiptr      size;

    OpenGLArrayRef  arrays;

};

typedef struct OpenGLIBOGeometryData   OpenGLIBOGeometryData;

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

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

#pragma mark -

#pragma mark Private - Utilites

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

static OpenGLIBOGeometryDataRef  OpenGLIBOGeometryCreateFromTable(const GLsizeiptr rowCount,

                                                                  const GLsizeiptr rowSize,

                                                                  NSArray *table)

{

    OpenGLIBOGeometryDataRef pGeometry = NULL;

    GLsizeiptr colCount = [table count];

    if( colCount > 0 )

    {

        pGeometry = (OpenGLIBOGeometryDataRef)calloc(1, sizeof(OpenGLIBOGeometryData));

        if( pGeometry != NULL )

        {

            pGeometry->count  = colCount;

            pGeometry->size   = pGeometry->count * sizeof(OpenGLArray);

            pGeometry->arrays = (OpenGLArrayRef)calloc(1, pGeometry->size);

            if( pGeometry->arrays != NULL )

            {

                GLsizeiptr   colIndex;

                GLsizeiptr   rowIndex;

                NSArray     *column;

                NSNumber    *value;

                for( colIndex = 0; colIndex < pGeometry->count; ++colIndex )

                {

                    pGeometry->arrays[colIndex].count  = rowCount;

                    pGeometry->arrays[colIndex].size   = rowSize;

                    pGeometry->arrays[colIndex].values = (GLfloat *)calloc(1, rowSize);

                    if( pGeometry->arrays[colIndex].values != NULL )

                    {

                        column = [table objectAtIndex:colIndex];

                        if( column )

                        {

                            for( rowIndex = 0; rowIndex < rowCount; ++rowIndex )

                            {

                                value = [column objectAtIndex:rowIndex];

                                if( value )

                                {

                                    pGeometry->arrays[colIndex].values[rowIndex] = [value floatValue];

                                } // if

                            } // for

                        } // if

                    } // if

                } // for

            } // if

        } // if

    } // if

    return( pGeometry );

} // OpenGLIBOGeometryCreateFromTable

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

static OpenGLIBOGeometryDataRef  OpenGLIBOGeometryCreateFromDictionary(NSDictionary *pDictionary)

{

    OpenGLIBOGeometryDataRef pGeometry = NULL;

    if( pDictionary )

    {

        NSDictionary *geometry = [pDictionary objectForKey:@"Geometry"];

        if( geometry )

        {

            NSNumber *rows = [geometry objectForKey:@"Rows"]; 

            if( rows )

            {

                GLsizeiptr rowCount = [rows integerValue];

                GLsizeiptr rowSize  = rowCount * sizeof(GLfloat);

                NSArray *table = [geometry objectForKey:@"Table"];

                if( table )

                {

                    pGeometry = OpenGLIBOGeometryCreateFromTable(rowCount,rowSize,table);

                } // if

            } // if

        } // if

    } // if

    return( pGeometry );

} // OpenGLIBOGeometryCreateFromDictionary

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

static void OpenGLIBOGeometryDelete(OpenGLIBOGeometryDataRef pGeometry)

{

    if( pGeometry != NULL )

    {

        if( pGeometry->arrays != NULL )

        {

            GLsizeiptr i;

            for( i = 0; i < pGeometry->count; ++i )

            {

                if( pGeometry->arrays[i].values != NULL )

                {

                    free( pGeometry->arrays[i].values );

                    pGeometry->arrays[i].values = NULL;

                } // if

            } // for

            free( pGeometry->arrays );

            pGeometry->arrays = NULL;

        } // if

        free( pGeometry );

        pGeometry = NULL;

    } // if

} // OpenGLIBOGeometryDelete

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

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

#pragma mark -

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

@implementation OpenGLIBOGeometry

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

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

- (id) initGeometryWithDictionary:(NSDictionary *)theDictionary

{

    self = [super init];

    if( self )

    {

        mpGeometry = OpenGLIBOGeometryCreateFromDictionary(theDictionary);

    } // if

    return( self );

} // initGeometryWithDictionary

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

- (void) dealloc

{

    OpenGLIBOGeometryDelete(mpGeometry);

    [super dealloc];

} // dealloc

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

- (GLsizeiptr) count

{

    return( mpGeometry->arrays[0].count );

} // count

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

- (GLsizeiptr) size

{

    return( mpGeometry->arrays[0].size );

} // size

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

- (GLfloat *) normals

{

    return( mpGeometry->arrays[0].values );

} // normals

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

- (GLfloat *) vertices

{

    return( mpGeometry->arrays[1].values );

} // vertices

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

- (GLfloat *) colors

{

    return( mpGeometry->arrays[2].values );

} // vertices

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

- (GLfloat *) texcoords

{

    return( mpGeometry->arrays[3].values );

} // vertices

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

@end

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

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