[C++] [Windows] Windows程序上使用OpenGL

#include 
#include 
#include 

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR, int)
{
	//初始化窗口类
	WNDCLASSEX wc;
	memset(&wc, 0, sizeof(WNDCLASSEX));
	wc.cbSize = sizeof(WNDCLASSEX);
	wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
	wc.hInstance = hInstance;
	wc.lpfnWndProc = DefWindowProc;
	wc.lpszClassName = "WindowClass";
	wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
	RegisterClassEx(&wc);

	//创建窗口
	HWND window = CreateWindowEx(WS_EX_WINDOWEDGE, "WindowClass", "OpenGL", WS_VISIBLE | WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 640, 640, nullptr, nullptr, hInstance, nullptr);

	//获取设备上下文
	HDC hdc = GetDC(window);

	//配置像素格式
	PIXELFORMATDESCRIPTOR pfd;
	memset(&pfd, 0, sizeof(PIXELFORMATDESCRIPTOR));
	pfd.cColorBits = 32;
	pfd.cDepthBits = 8;
	pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
	pfd.nVersion = 1;
	pfd.dwFlags = PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW | PFD_DOUBLEBUFFER;
	pfd.iLayerType = PFD_MAIN_PLANE;
	pfd.iPixelType = PFD_TYPE_RGBA;

	//设置像素格式
	int format = ChoosePixelFormat(hdc, &pfd);
	SetPixelFormat(hdc, format, &pfd);

	//创建渲染上下文
	HGLRC hrc = wglCreateContext(hdc);
	wglMakeCurrent(hdc, hrc);

	bool quit = false;
	MSG msg;
	while (!quit)
	{
		if (PeekMessage(&msg, nullptr, 0, 0, PM_REMOVE))
		{
			if (msg.message == WM_QUIT)
			{
				quit = true;
			}
			else
			{
				TranslateMessage(&msg);
				DispatchMessage(&msg);
			}
		}
		else
		{
			glClear(GL_COLOR_BUFFER_BIT);

			glBegin(GL_TRIANGLES);

			glColor4f(1, 0, 0, 1);
			glVertex2f(0, 0);
			glVertex2f(-1, -1);
			glVertex2f(0, 1);

			glColor4f(0, 1, 0, 1);
			glVertex2f(0, 0);
			glVertex2f(1, -1);
			glVertex2f(0, 1);

			glColor4f(0, 0, 1, 1);
			glVertex2f(0, 0);
			glVertex2f(-1, -1);
			glVertex2f(1, -1);

			glEnd();

			SwapBuffers(hdc);
		}
	}

	wglMakeCurrent(hdc, hrc);
	wglDeleteContext(hrc);
	ReleaseDC(window, hdc);
	DestroyWindow(window);

	return msg.wParam;
}