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#ifndef __DEMO_STAR_H
#define __DEMO_STAR_H

#include <vector>

// The STAR class.
class DEMO_Star
{
public:
	// Constructors
	DEMO_Star();
	DEMO_Star(float X, float Y, float Z);

	// Position of this star
	float x, y, z;
};

class DEMO_Starfield
{
public:
	DEMO_Starfield();
	DEMO_Starfield(int numStars, int width, int height, int depth);

	void addStar(float X, float Y, float Z);
	void update(float distance);
	void draw();

private:
	std::vector<DEMO_Star> mStar;
	int mNumStars;
	int mWidth, mHeight, mDepth;
};

#endif // __DEMO_STARS_H

#include "DarkGDK.h"
#include "stars.h"

DEMO_Star::DEMO_Star()
: x(0.0f), y(0.0f), z(0.0f)
{}

DEMO_Star::DEMO_Star(float X, float Y, float Z)
: x(X), y(Y), z(Z)
{}

DEMO_Starfield::DEMO_Starfield()
: mNumStars(0), mWidth(0), mHeight(0), mDepth(0)
{}

DEMO_Starfield::DEMO_Starfield(int numStars, int width, int height, int depth)
: mNumStars(numStars), mWidth(width), mHeight(height), mDepth(depth)
{
	for(int i=0; i<mNumStars; i++)
	{
		DEMO_Star newStar;
		newStar.x = (float)(dbRND(mWidth) - mWidth / 2);
		newStar.y = (float)(dbRND(mHeight) - mHeight / 2);
		newStar.z = (float)(dbRND(mDepth - 1) + 1);
		mStar.push_back(newStar);
	}
}

void DEMO_Starfield::addStar(float X, float Y, float Z)
{
	DEMO_Star newStar;
	newStar.x = (float)(dbRND(mWidth) - mWidth / 2);
	newStar.y = (float)(dbRND(mHeight) - mHeight / 2);
	newStar.z = (float)(dbRND(mDepth - 1) + 1);
	mStar.push_back(newStar);
	mNumStars++;
}

void DEMO_Starfield::update(float distance)
{
	if( mNumStars > 0 )
	{
		for(int i=0; i<mNumStars; i++)
		{
			mStar[i].z -= distance;
			if( mStar[i].z < 1.0f ) mStar[i].z += 1000.0f;
		}
	}
}

void DEMO_Starfield::draw()
{
	if( mNumStars > 0 )
	{
		int bm = dbCurrentBitmap();
		int sw = dbBitmapWidth(bm);
		int sh = dbBitmapHeight(bm);
		int hsw = sw >> 1;
		int hsh = sh >> 1;
		dbLockPixels();
		for(int i=0; i<mNumStars; i++)
		{
			// 2D Projection
			float px = (mStar[i].x / (mStar[i].z / (float)(sw / sh)));
			float py = (mStar[i].y / mStar[i].z);
			// Screen Space Mapping
			int sx = (int)(((int)(px * sw) >> 1) + hsw);
			int sy = (int)(((int)(py * sh) >> 1) + hsh);
			// Color the star based on distance
			int col = (int)(255.0 - 255.0f / 1000.0f * mStar[i].z);
			// and finally Draw the star.
			dbInk((255 << 24)|(col<<16)|(col<<8)|col, 0);
			dbDot(sx, sy);
		}
		dbUnlockPixels();
	}
}

1>------ Build started: Project: DGDKTest, Configuration: Debug Win32 ------
1>Linking...
1>LINK : warning LNK4098: defaultlib 'LIBCMT' conflicts with use of other libs; use /NODEFAULTLIB:library
1>stars.obj : error LNK2019: unresolved external symbol __CrtDbgReportW referenced in function "public: class DEMO_Star & __thiscall std::vector<class DEMO_Star,class std::allocator<class DEMO_Star> >::operator[](unsigned int)" (??A?$vector@VDEMO_Star@@V?$allocator@VDEMO_Star@@@std@@@std@@QAEAAVDEMO_Star@@I@Z)
1>libcpmtd.lib(stdthrow.obj) : error LNK2001: unresolved external symbol __CrtDbgReportW
1>libcpmtd.lib(xdebug.obj) : error LNK2019: unresolved external symbol __malloc_dbg referenced in function "void * __cdecl operator new(unsigned int,struct std::_DebugHeapTag_t const &,char *,int)" (??2@YAPAXIABU_DebugHeapTag_t@std@@PADH@Z)
1>libcpmtd.lib(xdebug.obj) : error LNK2019: unresolved external symbol __free_dbg referenced in function "void __cdecl operator delete(void *,struct std::_DebugHeapTag_t const &,char *,int)" (??3@YAXPAXABU_DebugHeapTag_t@std@@PADH@Z)
1>C:\Documents and Settings\Admin\My Documents\Visual Studio 2008\Projects\temp\Debug\DGDKTest.exe : fatal error LNK1120: 3 unresolved externals
1>Build log was saved at "file://c:\Documents and Settings\Admin\My Documents\Visual Studio 2008\Projects\temp\Debug\BuildLog.htm"
1>DGDKTest - 5 error(s), 1 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

void DEMO_Starfield::draw()
{
	for(int i=0; i<mNumStars; i++)
	{
		dbInk((255 << 24)|(col<<16)|(col<<8)|col, 0);
	}
}