//-----------------------------------------------------------------------------
//	Class:			Direct Graphics Sky Box
//	
//	Description:	This is an implementation of a sky box in directX.
//
//	Date:			15-05-2005
//-----------------------------------------------------------------------------

#ifndef DIRECT_GRAPHICS_SKYBOX_IMPL_INCLUDED
#define DIRECT_GRAPHICS_SKYBOX_IMPL_INCLUDED

#if _MSC_VER > 1000
#pragma once
#endif

#include "GraphicsObject.h"

class DirectGraphicsSkyBox : public GraphicsObject
{
public:
	DirectGraphicsSkyBox( std::string inName );
	~DirectGraphicsSkyBox();

protected:
	long Init( std::string inName );
	long Shutdown();
	long Clear();

	long Render();

	unsigned int GetType() { return Resource::RES_SKYBOX; }

	struct Vertex
	{
		D3DXVECTOR3 S;
		float u, v;

		enum FVF
		{
			FVF_Flags = D3DFVF_XYZ | D3DFVF_TEX1
		};
	};

	DirectGraphicsAdapter	*mAdapter;

	IDirect3DDevice9		*mDevice;
	IDirect3DTexture9		*mTexture;
	IDirect3DVertexBuffer9	*mVB;
};

#endif

//-----------------------------------------------------------------------------
//	Class:			Direct Graphics Sky Box
//	
//	Description:	This is an implementation of a sky box in directX.
//
//	Date:			15-05-2005
//-----------------------------------------------------------------------------


#include <d3dx9.h>

#include "Project.h"

#include "DirectGraphicsAdapter.h"
#include "DirectGraphicsSkyBox.h"

#define NUM_TRI 12

DirectGraphicsSkyBox::DirectGraphicsSkyBox( std::string inName ) : mTexture( 0 ),
																   mVB( 0 )
{
	Init( inName );
}

DirectGraphicsSkyBox::~DirectGraphicsSkyBox()
{
	Shutdown();
}

long DirectGraphicsSkyBox::Init( std::string inName )
{
	mAdapter = ( DirectGraphicsAdapter * )gSystem->GetVisualSystem();
	mDevice = mAdapter->GetDevice();

	//	Load cube texture.
	D3DXCreateTextureFromFile( mDevice, inName.c_str(), &mTexture );

	//	Create our Cube.
	Vertex theCube[] = 
	{	
		//	Positive X.
		{ D3DXVECTOR3(  1.0f, -1.0f,  1.0f ), 0.0f, 1.0f },	
		{ D3DXVECTOR3(  1.0f, -1.0f, -1.0f ), 0.0f, 0.0f },
		{ D3DXVECTOR3(  1.0f,  1.0f,  1.0f ), 1.0f, 1.0f },	

		{ D3DXVECTOR3(  1.0f, -1.0f, -1.0f ), 0.0f, 0.0f },
		{ D3DXVECTOR3(  1.0f,  1.0f,  1.0f ), 1.0f, 1.0f },	
		{ D3DXVECTOR3(  1.0f,  1.0f, -1.0f ), 1.0f, 0.0f },

		//	Negative X.
		{ D3DXVECTOR3( -1.0f, -1.0f,  1.0f ), 0.0f, 1.0f },	
		{ D3DXVECTOR3( -1.0f, -1.0f, -1.0f ), 0.0f, 0.0f },
		{ D3DXVECTOR3( -1.0f,  1.0f,  1.0f ), 1.0f, 1.0f },	

		{ D3DXVECTOR3( -1.0f, -1.0f, -1.0f ), 0.0f, 0.0f },
		{ D3DXVECTOR3( -1.0f,  1.0f,  1.0f ), 1.0f, 1.0f },	
		{ D3DXVECTOR3( -1.0f,  1.0f, -1.0f ), 1.0f, 0.0f },

		//	Positive Y.
		{ D3DXVECTOR3( -1.0f,  1.0f,  1.0f ), 0.0f, 1.0f },	
		{ D3DXVECTOR3( -1.0f,  1.0f, -1.0f ), 0.0f, 0.0f },
		{ D3DXVECTOR3(  1.0f,  1.0f,  1.0f ), 1.0f, 1.0f },	

		{ D3DXVECTOR3( -1.0f,  1.0f, -1.0f ), 0.0f, 0.0f },
		{ D3DXVECTOR3(  1.0f,  1.0f,  1.0f ), 1.0f, 1.0f },	
		{ D3DXVECTOR3(  1.0f,  1.0f, -1.0f ), 1.0f, 0.0f },

		//	Negative Y.
		{ D3DXVECTOR3( -1.0f, -1.0f,  1.0f ), 0.0f, 1.0f },	
		{ D3DXVECTOR3( -1.0f, -1.0f, -1.0f ), 0.0f, 0.0f },
		{ D3DXVECTOR3(  1.0f, -1.0f,  1.0f ), 1.0f, 1.0f },	

		{ D3DXVECTOR3( -1.0f, -1.0f, -1.0f ), 0.0f, 0.0f },
		{ D3DXVECTOR3(  1.0f, -1.0f,  1.0f ), 1.0f, 1.0f },	
		{ D3DXVECTOR3(  1.0f, -1.0f, -1.0f ), 1.0f, 0.0f },

		//	Positive Z.
		{ D3DXVECTOR3( -1.0f,  1.0f,  1.0f ), 0.0f, 1.0f },	
		{ D3DXVECTOR3( -1.0f, -1.0f,  1.0f ), 0.0f, 0.0f },
		{ D3DXVECTOR3(  1.0f,  1.0f,  1.0f ), 1.0f, 1.0f },	

		{ D3DXVECTOR3( -1.0f, -1.0f,  1.0f ), 0.0f, 0.0f },
		{ D3DXVECTOR3(  1.0f,  1.0f,  1.0f ), 1.0f, 1.0f },	
		{ D3DXVECTOR3(  1.0f, -1.0f,  1.0f ), 1.0f, 0.0f },

		//	Negative Z.
		{ D3DXVECTOR3( -1.0f,  1.0f, -1.0f ), 0.0f, 1.0f },	
		{ D3DXVECTOR3( -1.0f, -1.0f, -1.0f ), 0.0f, 0.0f },
		{ D3DXVECTOR3(  1.0f,  1.0f, -1.0f ), 1.0f, 1.0f },	

		{ D3DXVECTOR3( -1.0f, -1.0f, -1.0f ), 0.0f, 0.0f },
		{ D3DXVECTOR3(  1.0f,  1.0f, -1.0f ), 1.0f, 1.0f },	
		{ D3DXVECTOR3(  1.0f, -1.0f, -1.0f ), 1.0f, 0.0f },
	};

	mDevice->CreateVertexBuffer( ( NUM_TRI * 3 ) * sizeof( Vertex ),
								 D3DUSAGE_WRITEONLY,
								 Vertex::FVF_Flags,
                                 D3DPOOL_DEFAULT,
								 &mVB,
								 NULL );

	// Lock the vertex buffer, and set up our cube vertices.
	Vertex *theVBData;
	mVB->Lock( 0,
			   ( NUM_TRI * 3 ) * sizeof( Vertex ),
			   ( void** )&theVBData,
			   D3DLOCK_DISCARD );

	memcpy( theVBData, theCube, ( NUM_TRI * 3 ) * sizeof( Vertex ) );

	mVB->Unlock();

	return SYS_OK;
}

long DirectGraphicsSkyBox::Shutdown()
{
	SAFE_RELEASE( mVB );
	SAFE_RELEASE( mTexture );
	return Clear();
}

long DirectGraphicsSkyBox::Clear()
{
	mAdapter = 0;
	mDevice = 0;
	return SYS_OK;
}

long DirectGraphicsSkyBox::Render()
{
	if( mAdapter && mDevice )
	{
		mDevice->SetRenderState( D3DRS_LIGHTING, FALSE );
		mDevice->SetRenderState( D3DRS_ZENABLE, FALSE );
		mDevice->SetRenderState( D3DRS_CULLMODE, D3DCULL_NONE );
		mDevice->SetRenderState( D3DRS_CLIPPING, FALSE );

		mAdapter->ApplyMatrix();
		mDevice->SetTexture( 0, mTexture );
		mDevice->SetStreamSource( 0, mVB, 0, sizeof( Vertex ) );
		mDevice->SetFVF( Vertex::FVF_Flags );
		mDevice->DrawPrimitive( D3DPT_TRIANGLELIST, 0, NUM_TRI );

		mDevice->SetRenderState( D3DRS_CLIPPING, TRUE );
		mDevice->SetRenderState( D3DRS_CULLMODE, D3DCULL_CCW );
		mDevice->SetRenderState( D3DRS_ZENABLE, TRUE );
		mDevice->SetRenderState( D3DRS_LIGHTING, TRUE );
	}

	return SYS_OK;
}

	if( mSkyBox )	{		gSystem->GetVisualSystem()->PushMatrix();		gSystem->GetVisualSystem()->LoadIdentity();		gSystem->GetVisualSystem()->Translate( mCamera->Position() );		mSkyBox->Render();		gSystem->GetVisualSystem()->PopMatrix();	}