/*---------------------------------------------------------------------------*
  Project:  Horizon
  File:     demo_DisplayBuffers.cpp

  Copyright (C)2009-2012 Nintendo Co., Ltd.  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.

  $Rev: 46365 $
 *---------------------------------------------------------------------------*/

#include "demo/Render/demo_DisplayBuffers.h"

namespace demo
{

    /* ------------------------------------------------------------------------
        DisplayBuffersDescription class  member function
        ------------------------------------------------------------------------ */

    DisplayBuffersDescription::DisplayBuffersDescription(void) :
    m_TargetDisplay(NN_GX_DISPLAY0),
    m_DisplayBufferNum(DEMO_DISPLAY_BUFFER_NUM),
    m_Format(GL_RGB8_OES),
    m_Width(nn::gx::DISPLAY0_WIDTH), m_Height(nn::gx::DISPLAY0_HEIGHT),
    m_Area(NN_GX_MEM_FCRAM)
    {
    }

    DisplayBuffersDescription::~DisplayBuffersDescription(void)
    {
    }

    DisplayBuffersDescription DisplayBuffersDescription::GetDefaultDisplay0Description(void)
    {
        DisplayBuffersDescription displayBuffersDesc;
        displayBuffersDesc.m_TargetDisplay = NN_GX_DISPLAY0;
        displayBuffersDesc.m_DisplayBufferNum = DEMO_DISPLAY_BUFFER_NUM;
        displayBuffersDesc.m_Format = GL_RGB8_OES;
        displayBuffersDesc.m_Width = nn::gx::DISPLAY0_WIDTH;
        displayBuffersDesc.m_Height = nn::gx::DISPLAY0_HEIGHT;
        displayBuffersDesc.m_Area = NN_GX_MEM_FCRAM;

        return displayBuffersDesc;
    }

    DisplayBuffersDescription DisplayBuffersDescription::GetDefaultDisplay1Description(void)
    {
        DisplayBuffersDescription displayBuffersDesc;
        displayBuffersDesc.m_TargetDisplay = NN_GX_DISPLAY1;
        displayBuffersDesc.m_DisplayBufferNum = DEMO_DISPLAY_BUFFER_NUM;
        displayBuffersDesc.m_Format = GL_RGB8_OES;
        displayBuffersDesc.m_Width = nn::gx::DISPLAY1_WIDTH;
        displayBuffersDesc.m_Height = nn::gx::DISPLAY1_HEIGHT;
        displayBuffersDesc.m_Area = NN_GX_MEM_FCRAM;

        return displayBuffersDesc;
    }

    DisplayBuffersDescription DisplayBuffersDescription::GetDefaultDisplay0ExtDescription(void)
    {
        DisplayBuffersDescription displayBuffersDesc;
        displayBuffersDesc.m_TargetDisplay = NN_GX_DISPLAY0_EXT;
        displayBuffersDesc.m_Format = GL_RGB8_OES;
        displayBuffersDesc.m_Width = nn::gx::DISPLAY0_WIDTH;
        displayBuffersDesc.m_Height = nn::gx::DISPLAY0_HEIGHT;
        displayBuffersDesc.m_Area = NN_GX_MEM_FCRAM;
        displayBuffersDesc.m_DisplayBufferNum = 2;

        return displayBuffersDesc;
    }

  /* ------------------------------------------------------------------------
        DisplayBuffers class  member function
        ------------------------------------------------------------------------ */

   DisplayBuffers::DisplayBuffers(void) :   
   m_InitializeFlag(false),
   m_TargetDisplay(NN_GX_DISPLAY0),
   m_DisplayBufferNum(DEMO_DISPLAY_BUFFER_NUM),
   m_CurrentBufferIndex(0),
   m_Width(nn::gx::DISPLAY0_WIDTH), m_Height(nn::gx::DISPLAY0_HEIGHT)
   {
   }
   
   DisplayBuffers::~DisplayBuffers(void)
   {
       Finalize();
   }

   void DisplayBuffers::Initialize(const DisplayBuffersDescription& displayBufferDesc)
   {
       if ( ! m_InitializeFlag )
       {
           m_TargetDisplay = displayBufferDesc.m_TargetDisplay;

           m_DisplayBufferNum = displayBufferDesc.m_DisplayBufferNum;
                      
           m_Width = displayBufferDesc.m_Width;
           m_Height = displayBufferDesc.m_Height;

           nngxActiveDisplay(displayBufferDesc.m_TargetDisplay);
           nngxGenDisplaybuffers(m_DisplayBufferNum, m_DisplayBufferIdArray);

           for (u32 bufferIndex = 0; bufferIndex < m_DisplayBufferNum; bufferIndex++)
           {
               nngxBindDisplaybuffer(m_DisplayBufferIdArray[bufferIndex]);
               nngxDisplaybufferStorage(displayBufferDesc.m_Format,
                   displayBufferDesc.m_Width, displayBufferDesc.m_Height,
                   displayBufferDesc.m_Area);
               DEMO_ASSERT_GL_ERROR();
           }

           nngxDisplayEnv(0, 0);
           m_InitializeFlag = true;

           DEMO_ASSERT_GL_ERROR();
       }
   }

   void DisplayBuffers::Finalize(void)
   {
       if ( m_InitializeFlag )
       {
           nngxBindDisplaybuffer(0);
           DEMO_ASSERT_GL_ERROR();

           nngxDeleteDisplaybuffers(m_DisplayBufferNum, m_DisplayBufferIdArray);
           DEMO_ASSERT_GL_ERROR();

           for (u32 bufferIndex = 0; bufferIndex < m_DisplayBufferNum; bufferIndex++)
           {           
               m_DisplayBufferIdArray[bufferIndex] = 0;
           }     

           m_InitializeFlag = false;
       }
   }

   void DisplayBuffers::Create(const DisplayBuffersDescription& displayBuffersDesc,
       DisplayBuffers& displayBuffers)
   {       
       displayBuffers.Initialize(displayBuffersDesc);
   }
        
   void DisplayBuffers::Destroy(DisplayBuffers& displayBuffers)
   {
       displayBuffers.Finalize();
   }
   
   GLuint DisplayBuffers::GetTargetDisplayBufferId(void) const
   {
       return m_DisplayBufferIdArray[m_CurrentBufferIndex];
   }
     
   GLuint DisplayBuffers::GetPreviousTargetDisplayBufferId(void) const
   {
       if ( m_CurrentBufferIndex == 0 )
       {
           return m_DisplayBufferIdArray[m_DisplayBufferNum - 1];
       }
       else
       {
           return m_DisplayBufferIdArray[m_CurrentBufferIndex - 1];
       }
   }

   GLuint DisplayBuffers::GetDisplayBufferId(const u32 index) const
   {
       if ( index < m_DisplayBufferNum )
       {
           return m_DisplayBufferIdArray[m_CurrentBufferIndex];
       }
       else
       {
           return 0;
       }
   }

   void DisplayBuffers::Bind(void)
   {
       nngxActiveDisplay(m_TargetDisplay);
       nngxBindDisplaybuffer(m_DisplayBufferIdArray[m_CurrentBufferIndex]);
   }

   void DisplayBuffers::IncreaseBufferIndex(void)
   {
       m_CurrentBufferIndex++;
       if ( m_CurrentBufferIndex >= m_DisplayBufferNum )
       {
           m_CurrentBufferIndex = 0;
       }
   }

   u32 DisplayBuffers::GetWidth(void) const
   {
       return m_Width;
   }

   u32 DisplayBuffers::GetHeight(void) const
   {
       return m_Height;
   }

}