/*---------------------------------------------------------------------------*
  Project:  NintendoWare
  File:     gfx_RotateViewUpdater.cpp

  Copyright (C)2009-2010 Nintendo Co., Ltd./HAL Laboratory, Inc.  All rights reserved.

  These coded instructions, statements, and computer programs contain
  proprietary information of Nintendo of America Inc. and/or Nintendo
  Company Ltd., and are protected by Federal copyright law.  They may
  not be disclosed to third parties or copied or duplicated in any form,
  in whole or in part, without the prior written consent of Nintendo.

  $Revision: 29651 $
 *---------------------------------------------------------------------------*/

#include "precompiled.h"
#include <nw/gfx/gfx_RotateViewUpdater.h>
#include <nw/os/os_Memory.h>

namespace nw
{
namespace gfx
{

NW_UT_RUNTIME_TYPEINFO_DEFINITION(RotateViewUpdater, CameraViewUpdater);

//----------------------------------------
RotateViewUpdater*
RotateViewUpdater::Create(os::IAllocator* allocator)
{
    NW_NULL_ASSERT(allocator);
    
    void* updaterMemory = allocator->Alloc(sizeof(RotateViewUpdater));
    NW_NULL_ASSERT(updaterMemory);

    void* dataMemory
        = AllocateAndFill<ResRotateViewUpdaterData>(allocator, 0);

    ResRotateViewUpdaterData* buffer =
            new(dataMemory) ResRotateViewUpdaterData();

    buffer->typeInfo     = ResRotateViewUpdater::TYPE_INFO;
    buffer->m_ViewRotate = VIEW_VIEW_ROTATE;
    buffer->m_Flags      = 0x0;

    ResRotateViewUpdater resUpdater = ResRotateViewUpdater(buffer);


    return new(updaterMemory) RotateViewUpdater(allocator, true, resUpdater);
}

//----------------------------------------
RotateViewUpdater*
RotateViewUpdater::Create(os::IAllocator* allocator, ResRotateViewUpdater resUpdater)
{
    NW_NULL_ASSERT(allocator);
    
    void* updaterMemory = allocator->Alloc(sizeof(RotateViewUpdater));
    NW_NULL_ASSERT(updaterMemory);

    return new(updaterMemory) RotateViewUpdater(allocator, false, resUpdater);
}

//----------------------------------------
RotateViewUpdater::RotateViewUpdater(
    os::IAllocator* allocator,
    bool isDynamic,
    ResRotateViewUpdater resUpdater
)
: CameraViewUpdater(allocator, isDynamic),
  m_Resource(resUpdater)
{
}

//----------------------------------------
RotateViewUpdater::~RotateViewUpdater()
{
    if (this->IsDynamic() && this->m_Resource.IsValid())
    {
        this->GetAllocator().Free(m_Resource.ptr());
    }
}

//----------------------------------------
void 
RotateViewUpdater::Update(
                                math::MTX34* viewMatrix,
                                const math::MTX34& worldMatrix,
                                const math::VEC3& cameraPosition)
{
    NW_ASSERT(m_Resource.IsValid());
    u32 flags = m_Resource.GetFlags();
    if (ut::CheckFlag(flags, ResRotateViewUpdaterData::FLAG_INHERITING_ROTATE))
    {
        math::MTX33 rotateMatrix;
            math::MTX34ToMTX33(&rotateMatrix, &worldMatrix);

        math::VEC3 upwardVector(0.0f,1.0f,0.0f);
        math::VEC3 targetPosition(0.0f,0.0f,-1.0f);
        
        // TODO: ZXY回転の最適化が必要。
        math::MTX34 transformMatrix;
        math::MTX34 rotateMatrixX;
        math::MTX34 rotateMatrixY;
        math::MTX34 rotateMatrixZ;
        math::MTX34RotXYZRad(&rotateMatrixX, this->m_Resource.GetViewRotate().x, 0.0f, 0.0f);
        math::MTX34RotXYZRad(&rotateMatrixY, 0.0f, this->m_Resource.GetViewRotate().y, 0.0f);
        math::MTX34RotXYZRad(&rotateMatrixZ, 0.0f, 0.0f, this->m_Resource.GetViewRotate().z);

        math::MTX34Mult(&transformMatrix, &rotateMatrixY, &rotateMatrixX);
        math::MTX34Mult(&transformMatrix, &transformMatrix, &rotateMatrixZ);

        math::VEC3Transform(&upwardVector, &transformMatrix, &upwardVector);
        math::VEC3Transform(&upwardVector, &rotateMatrix, &upwardVector);

        math::VEC3Transform(&targetPosition, &transformMatrix, &targetPosition);
        math::VEC3Transform(&targetPosition, &rotateMatrix, &targetPosition);
        math::VEC3Add(&targetPosition, &targetPosition, &cameraPosition);

        math::MTX34LookAt(
            viewMatrix,
            &cameraPosition,
            &upwardVector,
            &targetPosition);
    }
    else
    {
        math::MTX34CameraRotateRad(viewMatrix, &cameraPosition, &this->m_Resource.GetViewRotate());
    }
}

} // namespace gfx
} // namespace nw