source: Daodan/src/Patches/Win32.c@ 1183

#include <windows.h>

#include "../Daodan.h"
#include "../Daodan_Config.h"
#include "Input.h"
#include "Win32.h"

#include "../Oni/Oni.h"


// LIrPlatform_Terminate wrapper. Removes any cursor clipping we've done. Doing
// this is required for Windows 98 :-D
void ONICALL DD_LIrPlatform_Terminate(void)
{
        ClipCursor(NULL);
        LIrPlatform_Terminate();
}

// LIrPlatform_Mode_Set wrapper. Clips cursor to window bounds to
// prevent loosing focus (mostly on Linux).
void ONICALL DD_LIrPlatform_Mode_Set(unsigned int active_mode)
{
        DDmAssert(ONgPlatformData.Window);

        if (active_mode)
        {
                RECT rc;
                POINT pt;

                pt.x = 0;
                pt.y = 0;

                if (GetClientRect(ONgPlatformData.Window, &rc) &&
                        ClientToScreen(ONgPlatformData.Window, &pt))
                {
                        rc.left   += pt.x;
                        rc.top    += pt.y;
                        rc.right  += pt.x;
                        rc.bottom += pt.y;

                        ClipCursor(&rc);
                }
        }
        else
        {
                ClipCursor(NULL);
        }

        LIrPlatform_Mode_Set(active_mode);
}

BOOL WINAPI DD_GetCursorPos(LPPOINT lpPoint)
{
        DDmAssert(ONgPlatformData.Window);
        
        return GetCursorPos(lpPoint) && ScreenToClient(ONgPlatformData.Window, lpPoint);
}

BOOL WINAPI DD_SetCursorPos(int X, int Y)
{
        POINT pt;
        pt.x = X;
        pt.y = Y;
        
        DDmAssert(ONgPlatformData.Window);
        
        return ClientToScreen(ONgPlatformData.Window, &pt) && SetCursorPos(pt.x, pt.y);
}

static LRESULT CALLBACK DD_ONrPlatform_WindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
        switch (uMsg)
        {
                case WM_SYSCOMMAND:
                        if (wParam == SC_SCREENSAVE)
                        {
                                // Prevent screen saver from starting when Oni has focus.
                                return 0;
                        }
                        break;
                
                case WM_PAINT:
                {
                        PAINTSTRUCT ps;
                        BeginPaint(hWnd, &ps);
                        // Oni does a useless PatBlt here.
                        EndPaint(hWnd, &ps);
                        return 0;
                }
                
                case WM_CLOSE:
                        // There's no way to reliably terminate a modal dialog.
                        // The following condition is (almost) always true.
                        if (WMgActive)
                                exit(0);

                        ONgTerminateGame = UUcTrue;
                        return 0;
                        
                case WM_SETCURSOR:
                        // If a mouse is inside our client area, we hide cursor (always),
                        // otherwise we ask DefWindowProc to set an appropriate arrow for us.
                        if (LOWORD(lParam) == HTCLIENT)
                        {
                                SetCursor(NULL);
                                return TRUE;
                        }

                        break;
        }

        LRESULT res;
        if (DDrInput_WindowProc(hWnd, uMsg, wParam, lParam, &res))
                return res;

        return ONrPlatform_WindowProc(hWnd, uMsg, wParam, lParam);
}


UUtError ONICALL DD_ONrPlatform_Initialize(ONtPlatformData *PlatformData)
{
        WNDCLASSEX WndClass;
        RECT Rect;
        const int Width = 640, Height = 480;
        DWORD window_style, window_style_ex;
 
        PlatformData->Instance = ONgInstance;
        PlatformData->Window   = NULL;
        
        if (FindWindow("ONI ", "ONI "))
        {
                AUrMessageBox(1, "Daodan: There is already an instance of the game running.");
                exit(0);
        }
        
        WndClass.cbSize        = sizeof(WndClass);
        WndClass.style         = CS_VREDRAW | CS_HREDRAW | CS_OWNDC;
        WndClass.cbClsExtra    = 0;
        WndClass.cbWndExtra    = 0;
        WndClass.hInstance     = PlatformData->Instance;
        WndClass.hCursor       = NULL; // To debug: LoadCursor(NULL, IDC_ARROW);
        WndClass.hIcon         = LoadIcon(ONgInstance, MAKEINTRESOURCE(103));
        WndClass.hIconSm       = LoadIcon(ONgInstance, MAKEINTRESOURCE(103));
        WndClass.hbrBackground = GetStockObject(BLACK_BRUSH);
        WndClass.lpszMenuName = NULL;
        WndClass.lpszMenuName  = NULL;
        WndClass.lpszClassName = "ONI ";
        WndClass.lpfnWndProc   = DD_ONrPlatform_WindowProc;
 
        RegisterClassEx(&WndClass);
        
        if (M3gResolutionSwitch)
        {
                // Do not allow border and topmost flag for a fullscreen window.
                window_style    = WS_POPUP;
                window_style_ex = 0;
        }
        else
        {
                ConfigOption_t* co = DDrConfig_GetOptOfType("windows.border", C_BOOL);
                int opt_border = 0;
                if (co && co->value.intBoolVal)
                        opt_border = 1;
                co = DDrConfig_GetOptOfType("windows.topmost", C_BOOL);
                int opt_topmost = 0;
                if (co && co->value.intBoolVal)
                        opt_topmost = 1;

                window_style    = (opt_border) ? WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_DLGFRAME | WS_MINIMIZEBOX : WS_POPUP;
                window_style_ex = (opt_topmost) ? WS_EX_TOPMOST : 0;
        }
        
        Rect.left = (GetSystemMetrics(SM_CXSCREEN) / 2) - (Width / 2);
        Rect.top = (GetSystemMetrics(SM_CYSCREEN) / 2) - (Height / 2);
        Rect.right = Rect.left + Width;
        Rect.bottom = Rect.top + Height;
        AdjustWindowRectEx(&Rect, window_style, FALSE, window_style_ex);
        
        PlatformData->Window = CreateWindowEx(window_style_ex, WndClass.lpszClassName, "ONI ", window_style,
                Rect.left, Rect.top, Rect.right - Rect.left, Rect.bottom - Rect.top,
                NULL, NULL, PlatformData->Instance, NULL);
        
        ShowWindow(PlatformData->Window, SW_SHOWNORMAL);
        UpdateWindow(PlatformData->Window);
 
        return UUcError_None;
 }