networking

external/steamworks/steamworksexample/StarField.cpp

@@ -0,0 +1,70 @@
+//========= Copyright <20> 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( IGameEngine *pGameEngine )
+{
+	m_pGameEngine = pGameEngine;
+
+	Init();
+}
+
+void CStarField::Init()
+{
+	StarVertex_t StarVertex;
+	m_nWidth = m_pGameEngine->GetViewportWidth();
+	m_nHeight = m_pGameEngine->GetViewportHeight();
+
+	m_VecStars.clear();
+	
+	// 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()%m_nWidth);
+		StarVertex.y = (float)(rand()%m_nHeight);
+		
+		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()
+{
+	if ( ( m_pGameEngine->GetViewportWidth() != m_nWidth ) || ( m_pGameEngine->GetViewportHeight() != m_nHeight ) )
+	{
+		Init();
+	}
+	
+	static int counter;	// per starfield draw..
+	counter++;
+	
+	for( size_t i = 0; i < m_VecStars.size(); ++i )
+	{
+		float x = m_VecStars[i].x;
+		float y = m_VecStars[i].y;
+		float scoot = (float)counter * (float)(m_VecStars[i].color & 0xFF) / (4.0f * 255.0f);
+		float newy = y - scoot;					// make things float up
+		while( newy < 0.0f ) newy += m_nHeight;	// keep it on screen
+		
+		m_pGameEngine->BDrawPoint( x, newy, m_VecStars[i].color );
+	}
+
+	m_pGameEngine->BFlushPointBuffer();
+}