3D編程-繪製最簡單的三角形

#include <d3d9.h>
#include <d3dx9.h>
#include <stdio.h>
#pragma comment(lib,"d3d9.lib")
#pragma comment(lib,"d3dx9.lib")
#pragma comment(lib,"winmm.lib")

#define KeyDown(vk_code) 	((GetAsyncKeyState(vk_code) & 0x8000) ? 1 : 0)
#define Msg(info) 			MessageBox(NULL,info,"message",MB_OK)
#define ErrorMsg(info) 		MessageBox(NULL,info,"error",MB_ICONSTOP)
#define	DXRELOBJ(pObject)	if(pObject){pObject->Release();}

#define WND_CLASS "wndclass"
#define WND_TITLE "D3DApp Demo"
#define WND_WIDTH    400
#define WND_HEIGHT   300

HWND g_hwnd;
HINSTANCE g_hinst;

LPDIRECT3D9 g_d3d;
LPDIRECT3DDEVICE9 g_device;
LPDIRECT3DVERTEXBUFFER9 g_vb;

#define D3DFVF_CUSTOM (D3DFVF_XYZ|D3DFVF_DIFFUSE)
struct CustomVertex
{
	float x,y,z;
	long color;
};

bool InitGeometry()
{
	CustomVertex triangle[]=
	{
		-1, -1, 0, 0xffff00,
		1, -1, 0, 0xff0000,
		0, 1, 0, 0x0000ff
	};
	
	if(FAILED(g_device->CreateVertexBuffer(sizeof(triangle), 0, D3DFVF_CUSTOM, D3DPOOL_DEFAULT, &g_vb, NULL)))
   		return false;

	void * paddr;
 
	if(FAILED(g_vb->Lock(0, 0, (void**)&paddr, 0)))
   		return false;
	
	memcpy(paddr, triangle, sizeof(triangle));
	
	g_vb->Unlock();
	
	return true;
}

bool InitD3D()
{
	if(NULL==(g_d3d = Direct3DCreate9(D3D_SDK_VERSION)))
		return false;
		
	D3DDISPLAYMODE d3dpm;
	if(FAILED(g_d3d->GetAdapterDisplayMode(D3DADAPTER_DEFAULT, &d3dpm)))
		return false;
	
	D3DPRESENT_PARAMETERS d3dpp;
	ZeroMemory(&d3dpp, sizeof(d3dpp));
	d3dpp.Windowed = TRUE;
	d3dpp.hDeviceWindow = g_hwnd;
	d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
	d3dpp.BackBufferFormat = d3dpm.Format;
	
	if(FAILED(g_d3d->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, g_hwnd,
		D3DCREATE_SOFTWARE_VERTEXPROCESSING, &d3dpp, &g_device)))
		return false;
	
	g_device->SetRenderState(D3DRS_LIGHTING, FALSE);
	g_device->SetRenderState(D3DRS_CULLMODE, D3DCULL_NONE);
	
	return true;
}

bool InitApp()
{
	if(!InitD3D() | !InitGeometry())
	{
		ErrorMsg("Unable to Initialize D3D !");
		return false;
	}
	
	return true;
}

void Render()
{
	g_device->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0,0,0), 1.0f, 0);
	g_device->BeginScene();
 
 
	g_device->SetStreamSource(0, g_vb, 0, sizeof(CustomVertex));
	g_device->SetFVF(D3DFVF_CUSTOM);
	g_device->DrawPrimitive(D3DPT_TRIANGLESTRIP, 0, 1);
	
	g_device->EndScene();
	g_device->Present(NULL, NULL, NULL, NULL);
}

void ShutdownApp()
{
	DXRELOBJ(g_vb);
	DXRELOBJ(g_device);
	DXRELOBJ(g_d3d); 
}

LRESULT CALLBACK MsgProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
{
	switch(msg)
	{
		case WM_DESTROY:
			PostQuitMessage(0);
			break;
			
		default:
			break;
	}
	
	return DefWindowProc(hwnd, msg, wparam, lparam);
}

int WINAPI WinMain(HINSTANCE hinst,HINSTANCE hprevinst, LPSTR cmdlint, INT show)
{
	g_hinst = hinst;
	
	WNDCLASSEX wcex;
	wcex.cbSize = sizeof(WNDCLASSEX);
	wcex.style = CS_CLASSDC;
	wcex.lpfnWndProc = MsgProc;
	wcex.cbClsExtra = 0;
	wcex.cbWndExtra = 0;
	wcex.hInstance = GetModuleHandle(NULL);
	wcex.hIcon = LoadIcon(NULL, IDC_APPSTARTING);
	wcex.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wcex.hCursor = LoadCursor( NULL, IDC_ARROW );
	wcex.lpszClassName = WND_CLASS;
	wcex.lpszMenuName = NULL;
	wcex.hIconSm = LoadIcon(NULL, IDC_APPSTARTING);
 
	if(!RegisterClassEx(&wcex))
	{
		ErrorMsg("RegisterClassEx failed!");
		return 0;
	}
	
	g_hwnd = CreateWindow(WND_CLASS, WND_TITLE, WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT, CW_USEDEFAULT, WND_WIDTH, WND_HEIGHT,
		NULL, NULL, hinst, NULL);
		
	if(!g_hwnd)
		return 0;
		
	ShowWindow(g_hwnd, SW_SHOWNORMAL);
	UpdateWindow(g_hwnd);

	MSG msg={0};
	
	if(!InitApp())
		msg.message = WM_QUIT;
		
	while(msg.message != WM_QUIT)
	{
		if(PeekMessage(&msg, 0, 0, 0, PM_REMOVE))
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
		
		Render();
	}
	
	ShutdownApp();
	UnregisterClass(WND_CLASS, wcex.hInstance);
	
	return 0;
}