directx opencl interop samples (with copy from opencl image2d to buffer)

samples/directx/winapp.hpp

+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#include <string>
+
+
+#define WINCLASS "WinAppWnd"
+
+#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;
+        m_hInstance   = ::GetModuleHandle(NULL);
+    }
+
+    virtual ~WinApp()
+    {
+        ::UnregisterClass(WINCLASS, m_hInstance);
+    }
+
+    int Create()
+    {
+        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);
+
+        return init();
+    }
+
+    virtual LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) = 0;
+
+    int run()
+    {
+        MSG msg;
+
+        ::ZeroMemory(&msg, sizeof(msg));
+
+        while (msg.message != WM_QUIT)
+        {
+            if (::PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE))
+            {
+                ::TranslateMessage(&msg);
+                ::DispatchMessage(&msg);
+            }
+            else
+            {
+                render();
+            }
+        }
+
+        return static_cast<int>(msg.wParam);
+    }
+
+protected:
+    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);
+    }
+
+    virtual int init() = 0;
+    virtual int render() = 0;
+
+    HINSTANCE   m_hInstance;
+    HWND        m_hWnd;
+    int         m_width;
+    int         m_height;
+    std::string m_window_name;
+};
+