/*
 * The 3D Studio File Format Library
 * Copyright (C) 1996-2001 by J.E. Hoffmann <je-h@gmx.net>
 * All rights reserved.
 *
 * This program is  free  software;  you can redistribute it and/or modify it
 * under the terms of the  GNU Lesser General Public License  as published by
 * the  Free Software Foundation;  either version 2.1 of the License,  or (at
 * your option) any later version.
 *
 * This  program  is  distributed in  the  hope that it will  be useful,  but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or  FITNESS FOR A  PARTICULAR PURPOSE.  See the  GNU Lesser General Public
 * License for more details.
 *
 * You should  have received  a copy of the GNU Lesser General Public License
 * along with  this program;  if not, write to the  Free Software Foundation,
 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * $Id$
 */
#define LIB3DS_EXPORT
#include <camera.h>
#include <chunk.h>
#include <readwrite.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
//#include <config.h>
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif

/*!
 * \defgroup camera Cameras
 *
 * \author J.E. Hoffmann <je-h@gmx.net>
 */

/*!
 * \ingroup camera
 */
Lib3dsCamera*
lib3ds_camera_new(const char *name)
{
    Lib3dsCamera *camera;

    ASSERT(name);
    ASSERT(strlen(name)<64);

    camera=(Lib3dsCamera*)calloc(sizeof(Lib3dsCamera), 1);
    if (!camera)
    {
        return(0);
    }
    strcpy(camera->name, name);
    camera->fov=45.0f;
    return(camera);
}


/*!
 * \ingroup camera
 */
void
lib3ds_camera_free(Lib3dsCamera *camera)
{
    memset(camera, 0, sizeof(Lib3dsCamera));
    free(camera);
}


/*!
 * \ingroup camera
 */
Lib3dsBool
lib3ds_camera_read(Lib3dsCamera *camera, FILE *f)
{
    Lib3dsChunk c;
    Lib3dsWord chunk;

    if (!lib3ds_chunk_read_start(&c, LIB3DS_N_CAMERA, f))
    {
        return(LIB3DS_FALSE);
    }
    {
        int i;
        for (i=0; i<3; ++i)
        {
            camera->position[i]=lib3ds_float_read(f);
        }
        for (i=0; i<3; ++i)
        {
            camera->target[i]=lib3ds_float_read(f);
        }
    }
    camera->roll=lib3ds_float_read(f);
    {
        float s;
        s=lib3ds_float_read(f);
        if (fabs(s)<LIB3DS_EPSILON)
        {
            camera->fov=45.0;
        }
        else
        {
            camera->fov=2400.0f/s;
        }
    }
    lib3ds_chunk_read_tell(&c, f);

    while ((chunk=lib3ds_chunk_read_next(&c, f))!=0)
    {
        switch (chunk)
        {
            case LIB3DS_CAM_SEE_CONE:
            {
                camera->see_cone=LIB3DS_TRUE;
            }
            break;
            case LIB3DS_CAM_RANGES:
            {
                camera->near_range=lib3ds_float_read(f);
                camera->far_range=lib3ds_float_read(f);
            }
            break;
            default:
                lib3ds_chunk_unknown(chunk);
        }
    }

    lib3ds_chunk_read_end(&c, f);
    return(LIB3DS_TRUE);
}


/*!
 * \ingroup camera
 */
Lib3dsBool
lib3ds_camera_write(Lib3dsCamera *camera, FILE *f)
{
    Lib3dsChunk c;

    c.chunk=LIB3DS_N_CAMERA;
    if (!lib3ds_chunk_write_start(&c,f))
    {
        return(LIB3DS_FALSE);
    }

    lib3ds_vector_write(camera->position, f);
    lib3ds_vector_write(camera->target, f);
    lib3ds_float_write(camera->roll, f);
    if (fabs(camera->fov)<LIB3DS_EPSILON)
    {
        lib3ds_float_write(2400.0f/45.0f, f);
    }
    else
    {
        lib3ds_float_write(2400.0f/camera->fov, f);
    }

    if (camera->see_cone)
    {
        Lib3dsChunk c;
        c.chunk=LIB3DS_CAM_SEE_CONE;
        c.size=6;
        lib3ds_chunk_write(&c, f);
    }
    {
        Lib3dsChunk c;
        c.chunk=LIB3DS_CAM_RANGES;
        c.size=14;
        lib3ds_chunk_write(&c, f);
        lib3ds_float_write(camera->near_range, f);
        lib3ds_float_write(camera->far_range, f);
    }

    if (!lib3ds_chunk_write_end(&c,f))
    {
        return(LIB3DS_FALSE);
    }
    return(LIB3DS_TRUE);
}


/*!

\typedef Lib3dsCamera
  \ingroup camera
  \sa _Lib3dsCamera

*/