DirextX编程

开发平台：
Visual C++

light.cpp：源码内容
							#include "zfxd3dUtility.h"
#include <stdio.h>
// D3D对象接口
IDirect3D9* g_pd3d;
// D3D设备接口
IDirect3DDevice9* g_pd3dDevice;
// 字体
ID3DXFont* g_pFont = NULL;
// 光源定义
D3DLIGHT9 g_pointLight;
D3DLIGHT9 g_directionalLight;
D3DLIGHT9 g_spotLight;
// 表明开启第几个灯
int g_nlight_Enabled = 0;
// 物体定义
ID3DXMesh* g_object[4] = {0, 0, 0, 0};
// 世界矩阵定义，每个物体对应一个世界矩阵
D3DXMATRIX  g_world_mat[4];
// 材质定义
D3DMATERIAL9 g_mtrl[4];
// 建立渲染环境
bool Setup()
{
	// 点光源初始化
	D3DXVECTOR3 pos(0, 0, 0);
	D3DXCOLOR yellow_color = YELLOW;
	g_pointLight = InitPointLight(&pos, &yellow_color);
	// 方向光源初始化
	D3DXVECTOR3 direction(1, -1, 0);
	D3DXCOLOR white_color = WHITE;
	g_directionalLight = InitDirectionalLight(&direction, &white_color);
	// 聚光灯初始化
	D3DXVECTOR3 spot_pos(4, 4, 0);
	D3DXVECTOR3 spot_direction(-1, -1, 0);
	D3DXCOLOR red_color = WHITE;
	g_spotLight = InitSpotLight(&spot_pos, &spot_direction, &red_color);
	// 材质初始化
	g_mtrl[0] = RED_MTRL;
	g_mtrl[1] = BLUE_MTRL;
	g_mtrl[2] = GREEN_MTRL;
	g_mtrl[3] = YELLOW_MTRL;
	// 世界矩阵初始化
	D3DXMatrixTranslation(&g_world_mat[0],  0.0f,  2.0f, 0.0f);
	D3DXMatrixTranslation(&g_world_mat[1],  0.0f, -3.0f, 0.0f);
	D3DXMatrixTranslation(&g_world_mat[2], -3.0f,  0.0f, 0.0f);
	D3DXMatrixTranslation(&g_world_mat[3],  3.0f,  0.0f, 0.0f);
	// 创建物体
	D3DXCreateTeapot(g_pd3dDevice, &g_object[0], 0);
	D3DXCreateSphere(g_pd3dDevice, 1.0f, 20, 20, &g_object[1], 0);
	D3DXCreateTorus(g_pd3dDevice, 0.5f, 1.0f, 20, 20, &g_object[2], 0);
	D3DXCreateCylinder(g_pd3dDevice, 0.5f, 0.5f, 2.0f, 20, 20, &g_object[3], 0);
	// 设定光源
	g_pd3dDevice->SetLight(0, &g_pointLight);
	g_pd3dDevice->SetLight(1, &g_directionalLight);
	g_pd3dDevice->SetLight(2, &g_spotLight);
	
	// 设定渲染状态
	g_pd3dDevice->SetRenderState(D3DRS_NORMALIZENORMALS, true);
	g_pd3dDevice->SetRenderState(D3DRS_SPECULARENABLE, true);
	g_pd3dDevice->SetRenderState(D3DRS_AMBIENT, 0xff333333);
	
	// 设置投影矩阵
	D3DXMATRIX proj;
	D3DXMatrixPerspectiveFovLH(
			&proj,
			D3DX_PI * 0.25f, // 45 - degree
			1,
			1.0f,
			100.0f);
	g_pd3dDevice->SetTransform(D3DTS_PROJECTION, &proj);
	return true;
}
bool DrawTextX()
{
	//用于渲染侦FPS
	static int tmLastTime = GetTickCount();
	int tmNow = GetTickCount();
	//用于计算渲染FPS
	static int nFrameCount = 0;
	static int nFPS = 0;
	if(tmNow - tmLastTime > 1000)
	{
		//计算FPS
		tmLastTime = tmNow;
		nFPS = nFrameCount;
		nFrameCount = 0;
	}
	nFrameCount ++;
	char str[500];
	RECT rect;
	rect.left = rect.top = 10;
	rect.bottom = rect.top + 30;
	rect.right = rect.left + 260;
	sprintf(str, "Current FPS:%d, please press Q to toggle WireFrame mode, 
		and press LButton to enable a different Light source", nFPS);
	g_pFont->DrawTextA(NULL, str, (int)strlen(str), &rect, DT_LEFT|DT_NOCLIP|DT_WORDBREAK, 0xffffff00);
	return true;
}
bool Display()
{
	// 获取两次进入函数入口的时间间隔
	static float lastTime = (float)timeGetTime();
	float curTime  = (float)timeGetTime();
	float timeDelta = (curTime - lastTime)*0.001f;
	lastTime = curTime;
	// 设定视口矩阵，你可以通过按下上下左右键改变视角
	static float angle  = (3.0f * D3DX_PI) / 2.0f;
	static float height = 5.0f;
	if( ::GetAsyncKeyState(VK_LEFT) & 0x8000f )
		angle -= 0.5f * timeDelta;
	if( ::GetAsyncKeyState(VK_RIGHT) & 0x8000f )
		angle += 0.5f * timeDelta;
	if( ::GetAsyncKeyState(VK_UP) & 0x8000f )
		height += 1.5f * timeDelta;
	if( ::GetAsyncKeyState(VK_DOWN) & 0x8000f )
		height -= 1.5f * timeDelta;
	D3DXVECTOR3 eyept( cosf(angle) * 10.0f, height, sinf(angle) * 10.0f );
	D3DXVECTOR3 lookAt(0.0f, 0.0f, 0.0f);
	D3DXVECTOR3 up(0.0f, 1.0f, 0.0f);
	D3DXMATRIX view_mat;
	D3DXMatrixLookAtLH(&view_mat, &eyept, &lookAt, &up);
	g_pd3dDevice->SetTransform(D3DTS_VIEW, &view_mat);
	// 设定灯光
	g_pd3dDevice->LightEnable( g_nlight_Enabled % 3, true);
	g_pd3dDevice->LightEnable( (g_nlight_Enabled + 1)%3, false);
	g_pd3dDevice->LightEnable( (g_nlight_Enabled + 2)%3, false);
	
	// 绘制场景
	g_pd3dDevice->Clear(0, 0, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, 0x00000000, 1.0f, 0);
	g_pd3dDevice->BeginScene();
	for(int i = 0; i < 4; i++)
	{
		// 设置相关的材质和世界矩阵，然后绘制物体
		g_pd3dDevice->SetMaterial(&g_mtrl[i]);
		g_pd3dDevice->SetTransform(D3DTS_WORLD, &g_world_mat[i]);
		g_object[i]->DrawSubset(0);
	}
	// 在屏幕上写字
	if(g_pFont)
		DrawTextX();
	g_pd3dDevice->EndScene();
	g_pd3dDevice->Present(0, 0, 0, 0);
	return true;
}
bool CleanUp()
{
	SAFE_RELEASE(g_pd3dDevice);
	SAFE_RELEASE(g_pd3d);
	for(int i = 0; i < 4; i++)
		SAFE_RELEASE(g_object[i]);
	return true;
}
int WINAPI WinMain(HINSTANCE hInstance,
				   HINSTANCE prevInstance, 
				   PSTR cmdLine,
				   int showCmd)
{
	// 应用程序初始化
	if(!InitD3DApp(hInstance, false/*true代表窗口模式*/, 
		D3DDEVTYPE_HAL, &g_pd3d, &g_pd3dDevice, "light"/*窗口标题*/, 1024, 768))
	{
		MessageBoxW(0, L"应用程序初始化失败", 0, 0);
		return 0;
	}
	// 创建字体
	if(!InitDXFont(g_pd3dDevice, &g_pFont, "Times New Roman"))
		g_pFont = NULL;
	Setup();
	// 进入消息循环
	MSG msg;
	ZeroMemory(&msg, sizeof(msg));
	while(msg.message != WM_QUIT)
	{
		if(PeekMessage(&msg, 0, 0, 0, PM_REMOVE))
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
		else
		{
			Display();
		}
	}
	CleanUp();
	return 0;
}
// 消息循环函数
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	static bool bWireFrame = false;
	switch( msg )
	{
	case WM_DESTROY:
		::PostQuitMessage(0);
		break;
	case WM_LBUTTONDOWN:
		g_nlight_Enabled++;
		break;
	case WM_KEYDOWN:
		if( wParam == VK_ESCAPE )
			::DestroyWindow(hwnd);
		break;
	case WM_CHAR:
		if(wParam == 'q')
			bWireFrame = !bWireFrame;
		if(bWireFrame)
			g_pd3dDevice->SetRenderState( D3DRS_FILLMODE, D3DFILL_WIREFRAME );
		else
			g_pd3dDevice->SetRenderState( D3DRS_FILLMODE, D3DFILL_SOLID );
		break;
	}
	return ::DefWindowProc(hwnd, msg, wParam, lParam);
}

						