#include	<windows.h>
#include	<d3d9.h>
#include	<d3dx9.h>
#include	<sdl.h>

struct D3DVERTEX
{
float	fX,fY,fZ;
DWORD	dwColor;
};

int main( int argc, char* argv[] )
{
	SDL_Event				event; //used for processing events and handling input
	LPDIRECT3D9				direct3D_object; //used to create a direct3D device					
	LPDIRECT3DDEVICE9		direct3D_device; // your most trusty rendering tool
	D3DPRESENT_PARAMETERS	present_parameters; //contains the parameters for important properties of the direct 3D device
	D3DXMATRIX				projection_matrix; //your projection matrix
	D3DVERTEX aTriangle[ ] = {{-2.0f,1.0f,10.0f,0xffff0000},{-3.0f,-1.0f,10.0f,0xff00ff00},{-1.0f,-1.0f,10.0f,0xff0000ff}}; //the actual data to be fed to the verte buffer
	LPDIRECT3DVERTEXBUFFER9 tri_buffer = NULL;	//used to store and draw triangle data				
	VOID* pData;	//pointer to the data og the vertex buffer
	//creating window
	if( SDL_Init( SDL_INIT_VIDEO  ) < 0 || !SDL_GetVideoInfo() ) 
		return 0;
	SDL_SetVideoMode( 800, 600, SDL_GetVideoInfo()->vfmt->BitsPerPixel, SDL_RESIZABLE );
	//creating direct3D object
	direct3D_object = Direct3DCreate9(D3D_SDK_VERSION);
	if( direct3D_object == NULL )
	{
		MessageBox(GetActiveWindow(),"Could not create Direct3D Object","D3D_OBJ ERR",MB_OK);
		return 0;
	}
	//setting parameters that will be needed to created direct3D device
	ZeroMemory(&present_parameters, sizeof(present_parameters));			
	present_parameters.Windowed = false;						
	present_parameters.SwapEffect = D3DSWAPEFFECT_DISCARD;
	present_parameters.EnableAutoDepthStencil = true;					
	present_parameters.AutoDepthStencilFormat = D3DFMT_D16;		
	present_parameters.hDeviceWindow = GetActiveWindow();	
	present_parameters.BackBufferWidth = 800;					
	present_parameters.BackBufferHeight = 600;					
	present_parameters.BackBufferFormat = D3DFMT_R5G6B5;					
	present_parameters.MultiSampleType = D3DMULTISAMPLE_NONE;
	//creating direct3D device
	if( FAILED(direct3D_object->CreateDevice(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,GetActiveWindow(), D3DCREATE_SOFTWARE_VERTEXPROCESSING,&present_parameters,&direct3D_device)))
	{
		MessageBox(GetActiveWindow(),"Could not create Direct3D Device","D3D_DEV ERR",MB_OK);
		return 0;
	}
	//establishing projection matrix, lighting, culling, depth buffer, and vertex format
	D3DXMatrixPerspectiveFovLH(&projection_matrix, D3DX_PI / 4.0f,(float) 800/600,1, 1000);
	direct3D_device->SetTransform(D3DTS_PROJECTION,&projection_matrix);
	direct3D_device->SetRenderState(D3DRS_AMBIENT,RGB(255,255,255));			
	direct3D_device->SetRenderState(D3DRS_LIGHTING,false);				
	direct3D_device->SetRenderState(D3DRS_CULLMODE,D3DCULL_NONE); 			
	direct3D_device->SetRenderState(D3DRS_ZENABLE,D3DZB_TRUE);	
	direct3D_device->SetFVF((D3DFVF_XYZ | D3DFVF_DIFFUSE));
	// creating vertex buffer
	direct3D_device->CreateVertexBuffer(sizeof(aTriangle),D3DUSAGE_WRITEONLY,(D3DFVF_XYZ | D3DFVF_DIFFUSE),D3DPOOL_MANAGED,&tri_buffer,NULL);
	tri_buffer->Lock(0,sizeof(pData),(void**)&pData,0);					
	memcpy(pData,aTriangle,sizeof(aTriangle));						
	tri_buffer->Unlock();								

	// MAIN LOOP
	while( 1 )
	{
		direct3D_device->Clear(0,NULL,D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER,D3DCOLOR_XRGB(0,0,0),1.0f,0);
		direct3D_device->BeginScene();							

		direct3D_device->SetStreamSource(0,tri_buffer,0,sizeof(D3DVERTEX));			
		direct3D_device->DrawPrimitive(D3DPT_TRIANGLELIST,0,1);				

		direct3D_device->EndScene();							
		direct3D_device->Present(NULL,NULL,NULL,NULL);

		while( SDL_PollEvent( &event ) ) 
			switch( event.type ) 
			{
				case SDL_KEYDOWN:
					if ( event.key.keysym.sym == SDLK_ESCAPE )
					{
						direct3D_device->Release();
						direct3D_device = NULL;
						direct3D_object->Release();
						direct3D_object = NULL;
						return 0;
					}
						break;
					case SDL_QUIT:
						return 0;
			}
	}
	return 0;
}