#include "Skybox.h"

Skybox::Skybox( IDirect3DDevice9* device )
{
	Device = device;

	// Initialize vertices
	if( !InitVB() )
	{
		::MessageBox(0, "Error initializing Skybox vertex buffer.", 0, 0);
		:ostQuitMessage(0);
	}

	// Initialize indices
	if( !InitIB() )
	{
		::MessageBox(0, "Error initializing Skybox index buffer.", 0, 0);
		:ostQuitMessage(0);
	}

}

Skybox::~Skybox()
{
	d3d::Release(VB);
	d3d::Release(IB);
}

bool Skybox::InitVB( )
{
	HRESULT hr = E_FAIL;

	if ( Device )
		hr = Device->CreateVertexBuffer( 8 * sizeof(d3d::XYZVertex),
										D3DUSAGE_WRITEONLY,
										d3d::XYZVertex::FVF,
										D3DPOOL_MANAGED,
										&VB,
										0 );

	if ( FAILED(hr) )
		return false;

	d3d::XYZVertex* v;
	VB->Lock( 0, 0, (void**)&v, 0 );

	//Top vertices
	v[0] = d3d::XYZVertex(  10.0f,  10.0f,  10.0f );
	v[1] = d3d::XYZVertex(  10.0f,  10.0f, -10.0f );
	v[2] = d3d::XYZVertex( -10.0f,  10.0f, -10.0f );
	v[3] = d3d::XYZVertex( -10.0f,  10.0f,  10.0f );

	//Bottom vertices
	v[4] = d3d::XYZVertex(  10.0f, -10.0f,  10.0f );
	v[5] = d3d::XYZVertex(  10.0f, -10.0f, -10.0f );
	v[6] = d3d::XYZVertex( -10.0f, -10.0f, -10.0f );
	v[7] = d3d::XYZVertex( -10.0f, -10.0f,  10.0f );

	VB->Unlock();
	
	return true;
}

bool Skybox::InitIB()
{
	HRESULT hr = E_FAIL;

	if ( Device )
		hr = Device->CreateIndexBuffer(	36 * sizeof(WORD),
										D3DUSAGE_WRITEONLY,
										D3DFMT_INDEX16,
										D3DPOOL_MANAGED,
										&IB,
										0 );

	if ( FAILED(hr) )
		return false;

	WORD* i;
	IB->Lock( 0, 0, (void**)&i, 0 );

	//Top faces
	i[0] = 0; i[1] = 2; i[2] = 1;
	i[3] = 0; i[4] = 3; i[5] = 2;
	//Bottom faces
	i[6] = 4; i[7]  = 5; i[8]  = 6;
	i[9] = 6; i[10] = 7; i[11] = 4;
	//Left faces
	i[12] = 3; i[13] = 7; i[14] = 6;
	i[15] = 6; i[16] = 2; i[17] = 3;
	//Right faces
	i[18] = 0; i[19] = 5; i[20] = 4;
	i[21] = 0; i[22] = 1; i[23] = 5;
	//Front faces
	i[24] = 3; i[25] = 0; i[26] = 4;
	i[27] = 4; i[28] = 7; i[29] = 3;
	//Back faces
	i[30] = 5; i[31] = 1; i[32] = 6;
	i[33] = 6; i[34] = 1; i[35] = 2;
	
	IB->Unlock();
	
	return true;
}

void Skybox::Render( )
{
	pre_render();

	D3DXMATRIX matView, matViewSave;
	Device->GetTransform( D3DTS_VIEW, &matViewSave );
	matView = matViewSave;
	matView._41 = 0.0f; matView._42 = -0.3f; matView._43 = 0.0f;
	
	Device->SetTransform( D3DTS_VIEW, &matView );
	
	Device->DrawIndexedPrimitive( D3DPT_TRIANGLELIST, 0, 0, 8, 0, 12 );
	
	Device->SetTransform( D3DTS_VIEW, &matViewSave );

	post_render();
}

void Skybox:re_render()
{
	//Device->SetRenderState( D3DRS_CULLMODE, D3DCULL_NONE );
	Device->SetRenderState( D3DRS_ZENABLE, false );
	Device->SetRenderState( D3DRS_ZWRITEENABLE, false );
	Device->SetRenderState( D3DRS_LIGHTING, false );
	Device->SetRenderState( D3DRS_FILLMODE, D3DFILL_WIREFRAME );
	Device->SetStreamSource( 0, VB, 0, sizeof(d3d::XYZVertex) );
}

void Skybox:ost_render()
{
	Device->SetRenderState( D3DRS_ZENABLE, true );
	Device->SetRenderState( D3DRS_ZWRITEENABLE, true );
	Device->SetRenderState( D3DRS_FILLMODE, D3DFILL_SOLID);
	Device->SetRenderState( D3DRS_LIGHTING, true );
}