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

HWND hWindow;
IDirect3D9* D3D;
IDirect3DDevice9* Device;

struct Vertex
{
	float x, y, z, rhw;
	D3DCOLOR Color;
};
#define FVF_VERTEX (D3DFVF_XYZRHW | D3DFVF_DIFFUSE)

LRESULT WINAPI WndProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
	switch( msg )
	{
	case WM_CLOSE:
		PostQuitMessage( 0 );
		return 0;
	case WM_PAINT:
		ValidateRect( hWnd, NULL );
		return 0;
	}

	return DefWindowProc( hWnd, msg, wParam, lParam );
}

int main()
{
	HINSTANCE hInstance = GetModuleHandle( NULL );

	//create a window
	WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, WndProc, 0, 0, hInstance, NULL, NULL, NULL, NULL, "MiniD3D", NULL };
	RegisterClassEx( &wc );
	hWindow = CreateWindowEx( WS_EX_APPWINDOW | WS_EX_WINDOWEDGE, "MiniD3D", "MiniD3D", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 
		300, 300, NULL, NULL, hInstance, NULL );
	ShowWindow( hWindow, SW_SHOW );
	UpdateWindow( hWindow );

	//Set up d3d
	D3D = Direct3DCreate9( D3D_SDK_VERSION );
	D3DPRESENT_PARAMETERS d3dpp = { 0 };
	d3dpp.Windowed = TRUE;
	d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
	d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;
	D3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWindow, D3DCREATE_HARDWARE_VERTEXPROCESSING, &d3dpp, &Device );

	//now create our triangle
	Vertex Triangle[3] = 
	{
		{ 150.0f, 50.0f, 0.5f, 1.0f, D3DCOLOR_XRGB( 255, 0, 0 ) },
		{ 250.0f, 250.0f, 0.5f, 1.0f, D3DCOLOR_XRGB( 0, 255, 0 ) },
		{ 50.0f, 250.0f, 0.5f, 1.0f, D3DCOLOR_XRGB( 0, 0, 255 ) }
	};

	MSG msg;
	bool RunApp = true;
	while( RunApp )
	{
		if( PeekMessage( &msg, NULL, 0, 0, PM_REMOVE ) )
		{
			if( msg.message == WM_QUIT )
				RunApp = false;

			TranslateMessage( &msg );
			DispatchMessage( &msg );
		}

		//render stuff
		Device->Clear( 0, 0, D3DCLEAR_TARGET, D3DCOLOR_XRGB( 0, 0, 0 ), 1.0f, 0 );

		Device->BeginScene();
		Device->SetFVF( FVF_VERTEX );
		Device->DrawPrimitiveUP( D3DPT_TRIANGLELIST, 1, Triangle, sizeof(Vertex) );
		Device->EndScene();

		Device->Present( 0, 0, 0, 0 );
	}

	Device->Release();
	D3D->Release();

	DestroyWindow( hWindow );
	return 0;
}