OpenGL学习！！！第一步自己搭windows环境

第一步：

先建立窗口和各种初始函数 #include <Windows.h>
#include <gl/GL.h>
#include <gl/GLU.h>

#pragma comment(lib,"opengl32.lib")
#pragma comment(lib,"glu32.lib")
LRESULT CALLBACK GLWindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch (msg)
{
case WM_CLOSE://关闭窗口
PostQuitMessage(0);
break;
}
return DefWindowProc(hwnd,msg,wParam,lParam );
}

INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ LPSTR lpCmdLine, _In_ int nShowCmd)
{

//register class
WNDCLASSEX wndclass;
wndclass.cbClsExtra = 0;
wndclass.cbSize = sizeof(WNDCLASSEX);

wndclass.cbWndExtra=0; //无需为窗口准备额外存储空间
wndclass.hbrBackground = NULL;//窗口背景无需额外东西，整个都是openGL
wndclass.hCursor = NULL;//鼠标光标
wndclass.hIcon = LoadCursor(NULL,IDC_ARROW); //生成程序在文件夹中的图标
wndclass.hIconSm = NULL;//窗口在左上角显示图标
wndclass.hInstance = hInstance;//windows窗口传进来的实例
wndclass.lpfnWndProc = GLWindowProc;//鼠标键盘 消息响应函数
wndclass.lpszClassName = L"GLWindow";//唯一标识符
wndclass.lpszMenuName = NULL;//菜单
wndclass.style = CS_VREDRAW | CS_HREDRAW;//class style 垂直 水平
ATOM atom = RegisterClassEx(&wndclass);//注册，会返回一个标记
if(!atom)
{
return 0;
}
//create window
HWND hwnd = CreateWindowEx(NULL, L"GLWindow", L"OpenGL Window", WS_OVERLAPPEDWINDOW, 100, 100, 800, 600, NULL, NULL, hInstance, NULL);
// 1.额外窗口风格 2.之前注册的Class name 3.窗口名字 4.建立窗口风格5,创建起始位置 x.y 宽度 高度 9.父窗口，10.菜单 11.hinstance 12.其他参数
//create opengl render context
HDC dc = GetDC(hwnd);
PIXELFORMATDESCRIPTOR pfd;//素格式描述符
memset(&pfd,0, sizeof(PIXELFORMATDESCRIPTOR));
pfd.nVersion = 1;
pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
pfd.cColorBits = 32;//深度缓冲区
pfd.cDepthBits = 24;//颜色缓冲区
pfd.cStencilBits = 8;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.iLayerType = PFD_MAIN_PLANE;
pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;//双缓冲区。学校老师上课讲的终于用上了T-T 前台缓冲区和后台缓冲区，指针交换！

int pixelFormat = ChoosePixelFormat(dc, &pfd);//选择一个颜色格式
SetPixelFormat(dc, pixelFormat, &pfd);//告诉dc 选择像素格式出来，叫做pixelformat

HGLRC rc = wglCreateContext(dc);
wglMakeCurrent(dc, rc);//做成当前渲染设备
//setup opengl context complete

//opengl init
glClearColor(0.1, 0.4, 0.6, 1.0);

//show window
ShowWindow(hwnd, SW_SHOW);
UpdateWindow(hwnd);
MSG msg;
while(true)
{
if (PeekMessage(&msg, NULL, NULL, NULL, PM_REMOVE))//抓到消息 ，从所有地方，抓所有消息，无任何过滤，从消息队列顶端移除掉
{
//处理消息
if(msg.message==WM_QUIT)//判断是否是退出消息
{
break;
}
TranslateMessage(&msg);//转换消息类型
DispatchMessage(&msg);
}
//draw scene
glClear(GL_COLOR_BUFFER_BIT);
//present scene
SwapBuffers(dc);//交换缓冲区， 前后
}
return 0;

}