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#if defined(_WIN32)
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
#elif defined(__linux__)
# include <X11/X.h>
# include <X11/Xlib.h>
# include <X11/Xutil.h>
#endif
#include <string>
#include <GL/gl.h>
#if defined(_WIN32)
# include <GL/glu.h>
#elif defined(__linux__)
# include <GL/glx.h>
#endif
#if defined(_WIN32)
# define WINCLASS "WinAppWnd"
#endif
#define SAFE_RELEASE(p) if (p) { p->Release(); p = NULL; }
class WinApp
{
public:
WinApp(int width, int height, std::string& window_name)
{
m_width = width;
m_height = height;
m_window_name = window_name;
#if defined(_WIN32)
m_hInstance = ::GetModuleHandle(NULL);
#endif
}
virtual ~WinApp()
{
#if defined(_WIN32)
::UnregisterClass(WINCLASS, m_hInstance);
#endif
}
int create()
{
#if defined(_WIN32)
WNDCLASSEX wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = &WinApp::StaticWndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = m_hInstance;
wcex.hIcon = LoadIcon(0, IDI_APPLICATION);
wcex.hCursor = LoadCursor(0, IDC_ARROW);
wcex.hbrBackground = 0;
wcex.lpszMenuName = 0L;
wcex.lpszClassName = WINCLASS;
wcex.hIconSm = 0;
ATOM wc = ::RegisterClassEx(&wcex);
RECT rc = { 0, 0, m_width, m_height };
::AdjustWindowRect(&rc, WS_OVERLAPPEDWINDOW, false);
m_hWnd = ::CreateWindow(
(LPCTSTR)wc, m_window_name.c_str(),
WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT,
rc.right - rc.left, rc.bottom - rc.top,
NULL, NULL, m_hInstance, (void*)this);
if (!m_hWnd)
return -1;
::ShowWindow(m_hWnd, SW_SHOW);
::UpdateWindow(m_hWnd);
::SetFocus(m_hWnd);
#elif defined(__linux__)
m_display = XOpenDisplay(NULL);
if (m_display == NULL)
{
return -1;
}
m_WM_DELETE_WINDOW = XInternAtom(m_display, "WM_DELETE_WINDOW", False);
static GLint visual_attributes[] = { GLX_RGBA, GLX_DEPTH_SIZE, 24, GLX_DOUBLEBUFFER, None };
m_visual_info = glXChooseVisual(m_display, 0, visual_attributes);
if (m_visual_info == NULL)
{
XCloseDisplay(m_display);
return -2;
}
Window root = DefaultRootWindow(m_display);
m_event_mask = ExposureMask | KeyPressMask;
XSetWindowAttributes window_attributes;
window_attributes.colormap = XCreateColormap(m_display, root, m_visual_info->visual, AllocNone);
window_attributes.event_mask = m_event_mask;
m_window = XCreateWindow(
m_display, root, 0, 0, m_width, m_height, 0, m_visual_info->depth,
InputOutput, m_visual_info->visual, CWColormap | CWEventMask, &window_attributes);
XMapWindow(m_display, m_window);
XSetWMProtocols(m_display, m_window, &m_WM_DELETE_WINDOW, 1);
XStoreName(m_display, m_window, m_window_name.c_str());
#endif
return init();
}
virtual void cleanup()
{
#if defined(_WIN32)
::DestroyWindow(m_hWnd);
#elif defined(__linux__)
XDestroyWindow(m_display, m_window);
XCloseDisplay(m_display);
#endif
}
#if defined(_WIN32)
virtual LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) = 0;
#endif
int run()
{
#if defined(_WIN32)
MSG msg;
::ZeroMemory(&msg, sizeof(msg));
while (msg.message != WM_QUIT)
{
if (::PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE))
{
::TranslateMessage(&msg);
::DispatchMessage(&msg);
}
else
{
idle();
}
}
return static_cast<int>(msg.wParam);
#elif defined(__linux__)
m_end_loop = false;
do {
XEvent e;
if (!XCheckWindowEvent(m_display, m_window, m_event_mask, &e) || !handle_event(e))
{
idle();
}
} while (!m_end_loop);
return 0;
#endif
}
protected:
#if defined(_WIN32)
static LRESULT CALLBACK StaticWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
WinApp* pWnd;
if (message == WM_NCCREATE)
{
LPCREATESTRUCT pCreateStruct = ((LPCREATESTRUCT)lParam);
pWnd = (WinApp*)(pCreateStruct->lpCreateParams);
::SetWindowLongPtr(hWnd, GWLP_USERDATA, (LONG_PTR)pWnd);
}
pWnd = GetObjectFromWindow(hWnd);
if (pWnd)
return pWnd->WndProc(hWnd, message, wParam, lParam);
else
return ::DefWindowProc(hWnd, message, wParam, lParam);
}
inline static WinApp* GetObjectFromWindow(HWND hWnd)
{
return (WinApp*)::GetWindowLongPtr(hWnd, GWLP_USERDATA);
}
#endif
#if defined(__linux__)
virtual int handle_event(XEvent& e) = 0;
#endif
virtual int init() = 0;
virtual int render() = 0;
virtual void idle() = 0;
#if defined(_WIN32)
HINSTANCE m_hInstance;
HWND m_hWnd;
#elif defined(__linux__)
Display* m_display;
XVisualInfo* m_visual_info;
Window m_window;
long m_event_mask;
Atom m_WM_DELETE_WINDOW;
bool m_end_loop;
#endif
int m_width;
int m_height;
std::string m_window_name;
cv::TickMeter m_timer;
};
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