/*

 * Copyright (c) 2003 Nokia Corporation and/or its subsidiary(-ies).

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of the License "Eclipse Public License v1.0"

 * which accompanies this distribution, and is available

 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

 *

 * Initial Contributors:

 * Nokia Corporation - initial contribution.

 *

 * Contributors:

 *

 * Description: Camera interface

 *

 */

 #ifndef __M3G_CAMERA_H__

 #define __M3G_CAMERA_H__

 /*!

  * \internal

  * \file 

  * \brief Camera interface

  */

 #include "m3g_gl.h"

 #include "m3g_node.h"

 /*!

  * \internal

  * \brief Camera node instance data

  */

 struct M3GCameraImpl

 {

 	Node node;

     M3Gint	 projType;   

     M3Gfloat heightFov;

     M3Gfloat aspect;

     M3Gfloat clipNear;

     M3Gfloat clipFar;

     Matrix	projMatrix;

     Vec4 frustumPlanes[6];

     M3Gbool frustumPlanesValid;

     M3Gbool zeroViewVolume;

 };

 /*----------------------------------------------------------------------

  * Internal functions

  *--------------------------------------------------------------------*/

 static void m3gInitCamera(Interface *m3g, Camera *camera);

 static void m3gApplyProjection(const Camera *camera);

 static const Vec4 *m3gFrustumPlanes(const Camera *camera);

 static const Matrix *m3gProjectionMatrix(const Camera *camera);

 M3G_INLINE static M3Gbool m3gValidProjection(const Camera *camera)

 {

     if (camera->zeroViewVolume) {

         M3G_LOG1(M3G_LOG_WARNINGS,

                  "Warning: Invalid projection for camera 0x%08X\n",

                  (unsigned) camera);

         return M3G_FALSE;

     }

     return M3G_TRUE;

 }

 #endif /*__M3G_CAMERA_H__*/