SteamworksSDK/SteamworksExample/StarField.cpp

//========= Copyright © 1996-2008, Valve LLC, All rights reserved. ============
//
// Purpose: Class for rendering the starfield
//
// $NoKeywords: $
//=============================================================================

#include "stdafx.h"
#include "StarField.h"
#include "stdlib.h"

//-----------------------------------------------------------------------------
// Purpose: Constructor
//-----------------------------------------------------------------------------
CStarField::CStarField( CGameEngine *pGameEngine )
{
	m_pGameEngine = pGameEngine;

	StarVertex_t StarVertex;
	int32 width = pGameEngine->GetViewportWidth();
	int32 height = pGameEngine->GetViewportHeight();

	// Generate star field data
	for( int i=0; i < STARFIELD_STAR_COUNT; ++i )
	{
		int32 nRand = (rand()%(255-50))+50; //value between 50 and 255 for shades of gray
		StarVertex.color = D3DCOLOR_ARGB( 255, nRand, nRand, nRand );

		StarVertex.x = (float)(rand()%width);
		StarVertex.y = (float)(rand()%height);

		m_VecStars.push_back( StarVertex );

		// bugbug jmccaskey - sometimes make "big stars" which are 4 points right next to each other?
	}
}


//-----------------------------------------------------------------------------
// Purpose: Render the star field
//-----------------------------------------------------------------------------
void CStarField::Render()
{
	for( size_t i = 0; i < m_VecStars.size(); ++i )
	{
		m_pGameEngine->BDrawPoint( m_VecStars[i].x, m_VecStars[i].y, m_VecStars[i].color );
	}

	m_pGameEngine->BFlushPointBuffer();
}