第一个Opengl程序

1. 学习网站：

    Nehe的OpenGL中文教程：http://www.yakergong.net/nehe/，（貌似这里的sdk和代码不能下载）

   Nehe的原版英文教程：http://nehe.gamedev.net/ （可以下载源码）

2. OpenGL的SDK下载：http://download.youkuaiyun.com/detail/damotiansheng/8031709

3. 下载了sdk后，在vs中设置了库文件和包含文件目录后（可能还需把dll放到system32目录下），添加代码如下：

注：下面的代码是从http://nehe.gamedev.net/下载来的，为lesson1的代码，同时增加些代码，不过需要改头文件，把头文件改为如下所示，即可编译运行了

/*
 *		This Code Was Created By Jeff Molofee 2000
 *		A HUGE Thanks To Fredric Echols For Cleaning Up
 *		And Optimizing This Code, Making It More Flexible!
 *		If You've Found This Code Useful, Please Let Me Know.
 *		Visit My Site At nehe.gamedev.net
 */

#include <windows.h>		// Header File For Windows
#include <gl/glew.h>		<span style="color:#ff0000;">// 包含最新的gl.h,glu.h库  //头文件不用原版的glaux.h,否则我的编译不过</span>
#include <gl/glut.h>		// 包含OpenGL实用库

HDC			hDC=NULL;		// Private GDI Device Context
HGLRC		hRC=NULL;		<span style="color:#ff0000;">// Permanent Rendering Context，它把OpenGL调用函数连接到设备上下文hDC,然后hDC再进行绘制</span>
HWND		hWnd=NULL;		// Holds Our Window Handle
HINSTANCE	hInstance;		// Holds The Instance Of The Application

bool	keys[256];			// Array Used For The Keyboard Routine
bool	active=TRUE;		// Window Active Flag Set To TRUE By Default
bool	fullscreen=TRUE;	// Fullscreen Flag Set To Fullscreen Mode By Default

LRESULT	CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);	// Declaration For WndProc

GLvoid ReSizeGLScene(GLsizei width, GLsizei height)		// Resize And Initialize The GL Window
{
	if (height==0)										// Prevent A Divide By Zero By
	{
		height=1;										// Making Height Equal One
	}

	glViewport(0,0,width,height);	//视点为（0,0）					// Reset The Current Viewport

	glMatrixMode(GL_PROJECTION);						// Select The Projection Matrix
	glLoadIdentity();									// Reset The Projection Matrix

	// Calculate The Aspect Ratio Of The Window
	gluPerspective(45.0f,(GLfloat)width/(GLfloat)height,0.1f,100.0f);//深度0.1到100的场景都可见，即需要被绘制

	glMatrixMode(GL_MODELVIEW);							// Select The Modelview Matrix
	glLoadIdentity();									// Reset The Modelview Matrix
}

int InitGL(GLvoid) //初始化，以给定颜色清除屏幕		// All Setup For OpenGL Goes Here
{
	glShadeModel(GL_SMOOTH);							// Enable Smooth Shading
	glClearColor(0.0f, 0.0f, 0.0f, 0.5f);				// Black Background
	glClearDepth(1.0f);									// Depth Buffer Setup
	glEnable(GL_DEPTH_TEST);							// Enables Depth Testing
	glDepthFunc(GL_LEQUAL);								// The Type Of Depth Testing To Do
	glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);	// Really Nice Perspective Calculations
	return TRUE;										// Initialization Went OK
}

int DrawGLScene(GLvoid)	//绘制图形								// Here's Where We Do All The Drawing
{
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER