/*
 * Copyright (c) 2010 Toni Spets <toni.spets@iki.fi>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <windows.h>
#include <windowsx.h>
#include <stdio.h>
#include <ctype.h>
#include "ddraw.h"

#include "main.h"
#include "palette.h"
#include "surface.h"
#include "clipper.h"

#define IDR_MYMENU 93

/* from mouse.c */
BOOL WINAPI fake_GetCursorPos(LPPOINT lpPoint);
void mouse_init();
void mouse_lock();
void mouse_unlock();

/* from screenshot.c */
#ifdef HAVE_LIBPNG
BOOL screenshot(struct IDirectDrawSurfaceImpl *);
#endif

IDirectDrawImpl *ddraw = NULL;

DWORD WINAPI render_main(void);
DWORD WINAPI render_soft_main(void);
DWORD WINAPI render_dummy_main(void);

int WindowPosX;
int WindowPosY;
char SettingsIniPath[MAX_PATH];

//BOOL WINAPI DllMainCRTStartup(HINSTANCE hinstDLL, DWORD dwReason, LPVOID lpvReserved)
BOOL WINAPI DllMain(HANDLE hDll, DWORD dwReason, LPVOID lpReserved)
{
    switch (dwReason)
    {
        case DLL_PROCESS_ATTACH:
        {
            printf("cnc-ddraw DLL_PROCESS_ATTACH");
            
            //SetProcessPriorityBoost(GetCurrentProcess(), TRUE);
            
            BOOL setDpiAware = FALSE;
            HMODULE hShcore = GetModuleHandle("shcore.dll");
            typedef HRESULT (__stdcall* SetProcessDpiAwareness_)(PROCESS_DPI_AWARENESS value);
            if(hShcore)
            {
                SetProcessDpiAwareness_ setProcessDpiAwareness = 
                    (SetProcessDpiAwareness_)GetProcAddress(hShcore, "SetProcessDpiAwareness");
                    
                if (setProcessDpiAwareness)
                {
                    HRESULT result = setProcessDpiAwareness(PROCESS_PER_MONITOR_DPI_AWARE);
                    setDpiAware = result == S_OK || result == E_ACCESSDENIED;
                }   
            }
            if (!setDpiAware)
            {
                HMODULE hUser32 = GetModuleHandle("user32.dll");
                typedef BOOL (__stdcall* SetProcessDPIAware_)();
                if(hUser32)
                {
                    SetProcessDPIAware_ setProcessDPIAware = 
                        (SetProcessDPIAware_)GetProcAddress(hUser32, "SetProcessDPIAware");
                        
                    if (setProcessDPIAware) 
                        setProcessDPIAware();
                }
            }
            
            timeBeginPeriod(1);
            break;
        }
        case DLL_PROCESS_DETACH:
        {
            printf("cnc-ddraw DLL_PROCESS_DETACH");
            
            char buf[16];
            sprintf(buf, "%d", WindowPosX);
            WritePrivateProfileString("ddraw", "posX", buf, SettingsIniPath); 

            sprintf(buf, "%d", WindowPosY);
            WritePrivateProfileString("ddraw", "posY", buf, SettingsIniPath); 
            
            timeEndPeriod(1);
            break;
        }
    }

    return TRUE;
}

HRESULT __stdcall ddraw_Compact(IDirectDrawImpl *This)
{
    printf("DirectDraw::Compact(This=%p)\n", This);

    return DD_OK;
}

HRESULT __stdcall ddraw_DuplicateSurface(IDirectDrawImpl *This, LPDIRECTDRAWSURFACE src, LPDIRECTDRAWSURFACE *dest)
{
    printf("DirectDraw::DuplicateSurface(This=%p, ...)\n", This);
    return DD_OK;
}

HRESULT __stdcall ddraw_EnumDisplayModes(IDirectDrawImpl *This, DWORD a, LPDDSURFACEDESC b, LPVOID c, LPDDENUMMODESCALLBACK d)
{
    printf("DirectDraw::EnumDisplayModes(This=%p, ...)\n", This);
    return DD_OK;
}

HRESULT __stdcall ddraw_EnumSurfaces(IDirectDrawImpl *This, DWORD a, LPDDSURFACEDESC b, LPVOID c, LPDDENUMSURFACESCALLBACK d)
{
    printf("DirectDraw::EnumSurfaces(This=%p, ...)\n", This);
    return DD_OK;
}

HRESULT __stdcall ddraw_FlipToGDISurface(IDirectDrawImpl *This)
{
    printf("DirectDraw::FlipToGDISurface(This=%p)\n", This);

    return DD_OK;
}

HRESULT __stdcall ddraw_GetCaps(IDirectDrawImpl *This, LPDDCAPS lpDDDriverCaps, LPDDCAPS lpDDEmulCaps)
{
    printf("DirectDraw::GetCaps(This=%p, lpDDDriverCaps=%p, lpDDEmulCaps=%p)\n", This, lpDDDriverCaps, lpDDEmulCaps);

    if(lpDDDriverCaps)
    {
        lpDDDriverCaps->dwSize = sizeof(DDCAPS);
        lpDDDriverCaps->dwCaps = DDCAPS_BLT|DDCAPS_PALETTE;
        lpDDDriverCaps->dwCKeyCaps = 0;
        lpDDDriverCaps->dwPalCaps = DDPCAPS_8BIT|DDPCAPS_PRIMARYSURFACE;
        lpDDDriverCaps->dwVidMemTotal = 16777216;
        lpDDDriverCaps->dwVidMemFree = 16777216;
        lpDDDriverCaps->dwMaxVisibleOverlays = 0;
        lpDDDriverCaps->dwCurrVisibleOverlays = 0;
        lpDDDriverCaps->dwNumFourCCCodes = 0;
        lpDDDriverCaps->dwAlignBoundarySrc = 0;
        lpDDDriverCaps->dwAlignSizeSrc = 0;
        lpDDDriverCaps->dwAlignBoundaryDest = 0;
        lpDDDriverCaps->dwAlignSizeDest = 0;
    }

    if(lpDDEmulCaps)
    {
        lpDDEmulCaps->dwSize = 0;
    }

    return DD_OK;
}

HRESULT __stdcall ddraw_GetDisplayMode(IDirectDrawImpl *This, LPDDSURFACEDESC a)
{
    printf("DirectDraw::GetDisplayMode(This=%p, ...)\n", This);
    return DD_OK;
}

HRESULT __stdcall ddraw_GetFourCCCodes(IDirectDrawImpl *This, LPDWORD a, LPDWORD b)
{
    printf("DirectDraw::GetFourCCCodes(This=%p, ...)\n", This);
    return DD_OK;
}

HRESULT __stdcall ddraw_GetGDISurface(IDirectDrawImpl *This, LPDIRECTDRAWSURFACE *a)
{
    printf("DirectDraw::GetGDISurface(This=%p, ...)\n", This);
    return DD_OK;
}

HRESULT __stdcall ddraw_GetMonitorFrequency(IDirectDrawImpl *This, LPDWORD a)
{
    printf("DirectDraw::GetMonitorFrequency(This=%p, ...)\n", This);
    return DD_OK;
}

HRESULT __stdcall ddraw_GetScanLine(IDirectDrawImpl *This, LPDWORD a)
{
    printf("DirectDraw::GetScanLine(This=%p, ...)\n", This);
    return DD_OK;
}

HRESULT __stdcall ddraw_GetVerticalBlankStatus(IDirectDrawImpl *This, LPBOOL a)
{
    printf("DirectDraw::GetVerticalBlankStatus(This=%p, ...)\n", This);
    return DD_OK;
}

HRESULT __stdcall ddraw_Initialize(IDirectDrawImpl *This, GUID *a)
{
    printf("DirectDraw::Initialize(This=%p, ...)\n", This);
    return DD_OK;
}

HRESULT __stdcall ddraw_RestoreDisplayMode(IDirectDrawImpl *This)
{
    printf("DirectDraw::RestoreDisplayMode(This=%p)\n", This);

    if(!This->render.run)
    {
        return DD_OK;
    }

    /* only stop drawing in GL mode when minimized */
    if (This->renderer == render_main)
    {
        EnterCriticalSection(&This->cs);
        This->render.run = FALSE;
        ReleaseSemaphore(ddraw->render.sem, 1, NULL);
        LeaveCriticalSection(&This->cs);

        WaitForSingleObject(This->render.thread, INFINITE);
        This->render.thread = NULL;
    }
    
    if(!ddraw->windowed)
    {
        ChangeDisplaySettings(&This->mode, 0);
    }

    return DD_OK;
}

HRESULT __stdcall ddraw_SetDisplayMode(IDirectDrawImpl *This, DWORD width, DWORD height, DWORD bpp)
{
    printf("DirectDraw::SetDisplayMode(This=%p, width=%d, height=%d, bpp=%d)\n", This, (unsigned int)width, (unsigned int)height, (unsigned int)bpp);

    This->mode.dmSize = sizeof(DEVMODE);
    This->mode.dmDriverExtra = 0;

    if(EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &This->mode) == FALSE)
    {
        /* not expected */
        return DDERR_UNSUPPORTED;
    }

    This->width = width;
    This->height = height;
    This->bpp = bpp;

    ddraw->cursor.x = width / 2;
    ddraw->cursor.y = height / 2;

    if(This->fullscreen)
    {
        This->render.width = This->mode.dmPelsWidth;
        This->render.height = This->mode.dmPelsHeight;
    }

    if(This->render.width < This->width)
    {
        This->render.width = This->width;
    }
    if(This->render.height < This->height)
    {
        This->render.height = This->height;
    }

    This->render.run = TRUE;
    
    if (This->renderer == render_dummy_main)
    {
        if(This->render.thread == NULL)
        {
            This->render.thread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)This->renderer, NULL, 0, NULL);
            //SetThreadPriority(This->render.thread, THREAD_PRIORITY_BELOW_NORMAL);
        }
        return DD_OK;
    }

    mouse_unlock();
	
	const HANDLE hbicon = LoadImage(GetModuleHandle(0), MAKEINTRESOURCE(IDR_MYMENU), IMAGE_ICON, GetSystemMetrics(SM_CXICON), GetSystemMetrics(SM_CYICON), 0);
	if (hbicon)
		SendMessage(This->hWnd, WM_SETICON, ICON_BIG, (LPARAM)hbicon);

	const HANDLE hsicon = LoadImage(GetModuleHandle(0), MAKEINTRESOURCE(IDR_MYMENU), IMAGE_ICON, GetSystemMetrics(SM_CXSMICON), GetSystemMetrics(SM_CYSMICON), 0);
	if (hsicon)
		SendMessage(This->hWnd, WM_SETICON, ICON_SMALL, (LPARAM)hsicon);

    
    memset(&This->render.mode, 0, sizeof(DEVMODE));
    This->render.mode.dmSize = sizeof(DEVMODE);
    This->render.mode.dmFields = DM_PELSWIDTH|DM_PELSHEIGHT;
    This->render.mode.dmPelsWidth = This->render.width;
    This->render.mode.dmPelsHeight = This->render.height;
    if(This->render.bpp)
    {
        This->render.mode.dmFields |= DM_BITSPERPEL;
        This->render.mode.dmBitsPerPel = This->render.bpp;
    }
    
    if(!This->windowed)
    {
        // Making sure the chosen resolution is valid
        if(!This->devmode)
        {
            int oldWidth = This->render.width;
            int oldHeight = This->render.height;
            
            if (ChangeDisplaySettings(&This->render.mode, CDS_TEST) != DISP_CHANGE_SUCCESSFUL)
            {
                // fail... compare resolutions
                if (This->render.width > This->mode.dmPelsWidth || This->render.height > This->mode.dmPelsHeight)
                {
                    // chosen game resolution higher than current resolution, use window mode for this case
                    This->windowed = TRUE;
                }
                else
                {
                    // Try 2x scaling
                    This->render.width *= 2;
                    This->render.height *= 2;
                    
                    This->render.mode.dmPelsWidth = This->render.width;
                    This->render.mode.dmPelsHeight = This->render.height;
                    
                    if (ChangeDisplaySettings(&This->render.mode, CDS_TEST) != DISP_CHANGE_SUCCESSFUL)
                    {
                        // try current display settings
                        This->render.width = This->mode.dmPelsWidth;
                        This->render.height = This->mode.dmPelsHeight;
                        
                        This->render.mode.dmPelsWidth = This->render.width;
                        This->render.mode.dmPelsHeight = This->render.height;
                        
                        if (ChangeDisplaySettings(&This->render.mode, CDS_TEST) != DISP_CHANGE_SUCCESSFUL)
                        {
                            // everything failed, use window mode instead
                            This->render.width = oldWidth;
                            This->render.height = oldHeight;
                            
                            This->render.mode.dmPelsWidth = This->render.width;
                            This->render.mode.dmPelsHeight = This->render.height;
                            
                            This->windowed = TRUE;
                        }
                        else
                            This->maintas = TRUE;
                    }
                }
            }
        }
    }
    
    This->render.viewport.width = This->render.width;
    This->render.viewport.height = This->render.height;
    This->render.viewport.x = 0;
    This->render.viewport.y = 0;
    
    if (This->boxing)
    {
        This->render.viewport.width = This->width;
        This->render.viewport.height = This->height;

        int i;
        for (i = 20; i-- > 1;)
        {
            if (This->width * i <= This->render.width && This->height * i <= This->render.height)
            {
                This->render.viewport.width *= i;
                This->render.viewport.height *= i;
                break;
            }
        }

        This->render.viewport.y = This->render.height / 2 - This->render.viewport.height / 2;
        This->render.viewport.x = This->render.width / 2 - This->render.viewport.width / 2;
    }
    else if (This->maintas)
    {
        This->render.viewport.width = This->render.width;
        This->render.viewport.height = ((float)This->height / This->width) * This->render.viewport.width;
        
        if (This->render.viewport.height > This->render.height)
        {
            This->render.viewport.width = 
                ((float)This->render.viewport.width / This->render.viewport.height) * This->render.height;
                
            This->render.viewport.height = This->render.height;
        }
         
        This->render.viewport.y = This->render.height / 2 - This->render.viewport.height / 2;
        This->render.viewport.x = This->render.width / 2 - This->render.viewport.width / 2;
    }
    
    if(This->windowed)
    {
        if(!This->windowed_init)
        {
            if (!This->border)
            {
                SetWindowLong(This->hWnd, GWL_STYLE, GetWindowLong(This->hWnd, GWL_STYLE) & ~(WS_CAPTION | WS_THICKFRAME | WS_MINIMIZE | WS_MAXIMIZE | WS_SYSMENU));
            }
            else
            {
                SetWindowLong(This->hWnd, GWL_STYLE, GetWindowLong(This->hWnd, GWL_STYLE) | WS_CAPTION | WS_BORDER | WS_SYSMENU | WS_MINIMIZEBOX | WS_MAXIMIZEBOX);
            }

            /* center the window with correct dimensions */
            int x = (WindowPosX != -1) ? WindowPosX : (This->mode.dmPelsWidth / 2) - (This->render.width / 2);
            int y = (WindowPosY != -1) ? WindowPosY : (This->mode.dmPelsHeight / 2) - (This->render.height / 2);
            RECT dst = { x, y, This->render.width+x, This->render.height+y };
            AdjustWindowRect(&dst, GetWindowLong(This->hWnd, GWL_STYLE), FALSE);
            SetWindowPos(This->hWnd, HWND_NOTOPMOST, dst.left, dst.top, (dst.right - dst.left), (dst.bottom - dst.top), SWP_SHOWWINDOW);

            This->windowed_init = TRUE;
        }
    }
    else
    {
        SetWindowPos(This->hWnd, HWND_TOPMOST, 0, 0, This->render.width, This->render.height, SWP_SHOWWINDOW);

        if(!This->devmode && ChangeDisplaySettings(&This->render.mode, CDS_FULLSCREEN) != DISP_CHANGE_SUCCESSFUL)
        {
            This->render.run = FALSE;
            return DDERR_INVALIDMODE;
        }
        
        mouse_lock();
    }
    
    if(This->render.viewport.x != 0 || This->render.viewport.y != 0)
    {
        RedrawWindow(This->hWnd, NULL, NULL, RDW_ERASE | RDW_INVALIDATE);
    }
    
    if(This->render.thread == NULL)
    {
        This->render.thread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)This->renderer, NULL, 0, NULL);
        //SetThreadPriority(This->render.thread, THREAD_PRIORITY_BELOW_NORMAL);
    }

    return DD_OK;
}

/* minimal window proc for dummy renderer as everything is emulated */
LRESULT CALLBACK dummy_WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch(uMsg)
    {
        /* if the plugin window changes */
        case WM_USER:
            ddraw->hWnd = (HWND)lParam;
            ddraw->render.hDC = GetDC(ddraw->hWnd);
        case WM_ACTIVATEAPP:
            if (wParam == TRUE)
            {
                break;
            }
        case WM_SIZE:
        case WM_NCACTIVATE:
            return DefWindowProc(hWnd, uMsg, wParam, lParam);
        case WM_MOUSEMOVE:
        case WM_NCMOUSEMOVE:
            ddraw->cursor.x = GET_X_LPARAM(lParam);
            ddraw->cursor.y = GET_Y_LPARAM(lParam);
            break;
    }

    if (ddraw->WndProc)
    {
        return ddraw->WndProc(hWnd, uMsg, wParam, lParam);
    }

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

void ToggleFullscreen()
{
    if (ddraw->windowed)
    {
        mouse_unlock();
        if(ChangeDisplaySettings(&ddraw->render.mode, CDS_FULLSCREEN) == DISP_CHANGE_SUCCESSFUL)
        {
            ddraw->windowed = FALSE;
            
            SetWindowLong(ddraw->hWnd, GWL_STYLE, GetWindowLong(ddraw->hWnd, GWL_STYLE) & ~(WS_CAPTION | WS_THICKFRAME | WS_MINIMIZE | WS_MAXIMIZE | WS_SYSMENU));
            SetWindowPos(ddraw->hWnd, HWND_TOPMOST, 0, 0, ddraw->render.width, ddraw->render.height, SWP_SHOWWINDOW);
        }
        mouse_lock();
    }
    else
    {
        mouse_unlock();
        if(ChangeDisplaySettings(&ddraw->mode, 0) == DISP_CHANGE_SUCCESSFUL)
        {
            if (!ddraw->border)
            {
                SetWindowLong(ddraw->hWnd, GWL_STYLE, GetWindowLong(ddraw->hWnd, GWL_STYLE) & ~(WS_CAPTION | WS_THICKFRAME | WS_MINIMIZE | WS_MAXIMIZE | WS_SYSMENU));
            }
            else
            {
                SetWindowLong(ddraw->hWnd, GWL_STYLE, GetWindowLong(ddraw->hWnd, GWL_STYLE) | WS_CAPTION | WS_BORDER | WS_SYSMENU | WS_MINIMIZEBOX | WS_MAXIMIZEBOX);
            }
            
            int x = (WindowPosX != -1) ? WindowPosX : (ddraw->mode.dmPelsWidth / 2) - (ddraw->render.width / 2);
            int y = (WindowPosY != -1) ? WindowPosY : (ddraw->mode.dmPelsHeight / 2) - (ddraw->render.height / 2);
            RECT dst = { x, y, ddraw->render.width+x, ddraw->render.height+y };
            AdjustWindowRect(&dst, GetWindowLong(ddraw->hWnd, GWL_STYLE), FALSE);
            SetWindowPos(ddraw->hWnd, HWND_NOTOPMOST, dst.left, dst.top, (dst.right - dst.left), (dst.bottom - dst.top), SWP_SHOWWINDOW);
            
            ddraw->windowed = TRUE;
            ddraw->windowed_init = TRUE;
        }
        mouse_lock();
    }
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    RECT rc = { 0, 0, ddraw->render.width, ddraw->render.height };
    
    switch(uMsg)
    {
        case WM_SIZE: 
            return DefWindowProc(hWnd, uMsg, wParam, lParam); /* Carmageddon fix */
        case WM_MOVE:
        {
            if (ddraw->windowed && ddraw->windowed_init)
            {
                int x = (int)(short)LOWORD(lParam);
                int y = (int)(short)HIWORD(lParam);
                
                if (x != -32000) 
                    WindowPosX = x; // -32000 = Exit/Minimize
                
                if (y != -32000)
                    WindowPosY = y;
            }
            
            return DefWindowProc(hWnd, uMsg, wParam, lParam); /* Carmageddon fix */
        }

        /* C&C and RA really don't want to close down */
        case WM_SYSCOMMAND:
            if (wParam == SC_CLOSE)
            {
                exit(0);
            }
            if (wParam == SC_MAXIMIZE)
            {
                ToggleFullscreen();
                return 0;
            }
                
            return DefWindowProc(hWnd, uMsg, wParam, lParam);

        case WM_ACTIVATE:
            if (wParam == WA_ACTIVE || wParam == WA_CLICKACTIVE)
            {
                if (!ddraw->windowed)
                {
                    ChangeDisplaySettings(&ddraw->render.mode, CDS_FULLSCREEN);
                }
                if (wParam == WA_ACTIVE)
                {
                    mouse_lock();
                }
            }
            else if (wParam == WA_INACTIVE)
            {
                mouse_unlock();

                /* minimize our window on defocus when in fullscreen */
                if (!ddraw->windowed)
                {
                    ChangeDisplaySettings(&ddraw->mode, 0);
                    ShowWindow(ddraw->hWnd, SW_MINIMIZE);
                }
            }
            return 0;

        //workaround for a bug where sometimes a background window steals the focus
        case WM_WINDOWPOSCHANGING:
        {
            if (ddraw->locked)
            {
                WINDOWPOS *pos = (WINDOWPOS *)lParam;
                
                if (pos->flags == SWP_NOMOVE + SWP_NOSIZE)
                {
                    mouse_unlock();
                    
                    if (GetForegroundWindow() == ddraw->hWnd)
                        mouse_lock();
                }
            }
            break;
        }

        case WM_MOUSELEAVE:
            mouse_unlock();
            return 0;

        case WM_ACTIVATEAPP:
            /* C&C and RA stop drawing when they receive this with FALSE wParam, disable in windowed mode */
            if (ddraw->windowed || ddraw->noactivateapp)
            {
                return 0;
            }
            break;
        case WM_AUTORENDERER:
        {
            mouse_unlock();
            SetWindowPos(ddraw->hWnd, HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);
            SetWindowPos(ddraw->hWnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);
            //ShowWindow(ddraw->hWnd, SW_MINIMIZE);
            //ShowWindow(ddraw->hWnd, SW_RESTORE);
            mouse_lock();
            return 0;
        }
        case WM_NCLBUTTONDBLCLK:
        {
            ToggleFullscreen();
            return 0;
        }
        case WM_SYSKEYDOWN:
        {
            if (wParam == VK_RETURN)
            {
                ToggleFullscreen();
                return 0;
            }
            break;
        }
        case WM_KEYDOWN:
            if(wParam == VK_CONTROL || wParam == VK_TAB)
            {
                if(GetAsyncKeyState(VK_CONTROL) & 0x8000 && GetAsyncKeyState(VK_TAB) & 0x8000)
                {
                    mouse_unlock();
                    return 0;
                }
            }
#ifdef HAVE_LIBPNG
            if(wParam == VK_CONTROL || wParam == ddraw->screenshotKey)
            {
                if(GetAsyncKeyState(VK_CONTROL) & 0x8000 && GetAsyncKeyState(ddraw->screenshotKey) & 0x8000)
                {
                    screenshot(ddraw->primary);
                    return 0;
                }
            }
#endif
            break;

#ifdef HAVE_LIBPNG
        case WM_KEYUP:
            if (wParam == VK_SNAPSHOT)
                screenshot(ddraw->primary);

            break;
#endif
            

        /* button up messages reactivate cursor lock */
        case WM_LBUTTONUP:
        case WM_RBUTTONUP:
        case WM_MBUTTONUP:
            if (!ddraw->devmode && !ddraw->locked)
            {
                int x = GET_X_LPARAM(lParam);
                int y = GET_Y_LPARAM(lParam);
                
                if (x > ddraw->render.viewport.x + ddraw->render.viewport.width || 
                    x < ddraw->render.viewport.x || 
                    y > ddraw->render.viewport.y + ddraw->render.viewport.height ||
                    y < ddraw->render.viewport.y)
                {
                    ddraw->cursor.x = ddraw->width / 2;
                    ddraw->cursor.y = ddraw->height / 2;
                }    
                else
                {
                    ddraw->cursor.x = 
                        (x - ddraw->render.viewport.x) * ((float)ddraw->width / ddraw->render.viewport.width);
                        
                    ddraw->cursor.y = 
                        (y - ddraw->render.viewport.y) * ((float)ddraw->height / ddraw->render.viewport.height);
                }

                mouse_lock();
                return 0;
            }
            /* fall through for lParam */

        /* down messages are ignored if we have no cursor lock */
        case WM_LBUTTONDOWN:
        case WM_RBUTTONDOWN:
        case WM_MBUTTONDOWN:
        case WM_MOUSEMOVE:

            if (!ddraw->devmode)
            {
                if (!ddraw->locked)
                {
                    return 0;
                }
                
                if(ddraw->adjmouse)
                {
                    fake_GetCursorPos(NULL); /* update our own cursor */
                    lParam = MAKELPARAM(ddraw->cursor.x, ddraw->cursor.y);
                }
            }

            if (ddraw->devmode)
            {
                mouse_lock();
                ddraw->cursor.x = GET_X_LPARAM(lParam);
                ddraw->cursor.y = GET_Y_LPARAM(lParam);
            }
            break;

        /* make sure we redraw when WM_PAINT is requested */
        case WM_PAINT:
            EnterCriticalSection(&ddraw->cs);
            ReleaseSemaphore(ddraw->render.sem, 1, NULL);
            LeaveCriticalSection(&ddraw->cs);
            break;

        case WM_ERASEBKGND:
            EnterCriticalSection(&ddraw->cs);
            FillRect(ddraw->render.hDC, &rc, (HBRUSH) GetStockObject(BLACK_BRUSH));
            ReleaseSemaphore(ddraw->render.sem, 1, NULL);
            LeaveCriticalSection(&ddraw->cs);
            break;
    }

    return ddraw->WndProc(hWnd, uMsg, wParam, lParam);
}

HRESULT __stdcall ddraw_SetCooperativeLevel(IDirectDrawImpl *This, HWND hWnd, DWORD dwFlags)
{
    PIXELFORMATDESCRIPTOR pfd;

    printf("DirectDraw::SetCooperativeLevel(This=%p, hWnd=0x%08X, dwFlags=0x%08X)\n", This, (unsigned int)hWnd, (unsigned int)dwFlags);

    /* Red Alert for some weird reason does this on Windows XP */
    if(hWnd == NULL)
    {
        return DDERR_INVALIDPARAMS;
    }

    if (This->hWnd == NULL)
    {
        This->hWnd = hWnd;
    }

    mouse_init();

    This->WndProc = (LRESULT(CALLBACK *)(HWND, UINT, WPARAM, LPARAM))GetWindowLong(hWnd, GWL_WNDPROC);

    if (This->renderer == render_dummy_main)
    {
        This->render.hDC = GetDC(This->hWnd);
        SetWindowLong(hWnd, GWL_WNDPROC, (LONG)dummy_WndProc);
        ShowWindow(hWnd, SW_HIDE);
        PostMessage(hWnd, WM_ACTIVATEAPP, TRUE, TRUE);
        PostMessage(This->hWnd, WM_USER, 0, (LPARAM)hWnd);
        return DD_OK;
    }

    SetWindowLong(This->hWnd, GWL_WNDPROC, (LONG)WndProc);

    if(!This->render.hDC)
    {
        This->render.hDC = GetDC(This->hWnd);

        memset(&pfd, 0, sizeof(PIXELFORMATDESCRIPTOR));
        pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
        pfd.nVersion = 1;
        pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_DOUBLEBUFFER | (This->renderer == render_main ? PFD_SUPPORT_OPENGL : 0);
        pfd.iPixelType = PFD_TYPE_RGBA;
        pfd.cColorBits = ddraw->render.bpp ? ddraw->render.bpp : ddraw->mode.dmBitsPerPel;
        pfd.iLayerType = PFD_MAIN_PLANE;
        SetPixelFormat( This->render.hDC, ChoosePixelFormat( This->render.hDC, &pfd ), &pfd );
    }

    SetCursor(LoadCursor(NULL, IDC_ARROW));

    GetWindowText(This->hWnd, (LPTSTR)&This->title, sizeof(This->title));

    ddraw->isredalert = strcmp(This->title, "Red Alert") == 0;
    ddraw->iscnc1 = strcmp(This->title, "Command & Conquer") == 0;
    
    if(This->vhack == 1)
    {
        if (!ddraw->isredalert && !ddraw->iscnc1)
        {
            This->vhack = 0;
        }
    }

    return DD_OK;
}

HRESULT __stdcall ddraw_WaitForVerticalBlank(IDirectDrawImpl *This, DWORD a, HANDLE b)
{
#if _DEBUG_X
    printf("DirectDraw::WaitForVerticalBlank(This=%p, ...)\n", This);
#endif
    return DD_OK;
}

HRESULT __stdcall ddraw_QueryInterface(IDirectDrawImpl *This, REFIID riid, void **obj)
{
    printf("DirectDraw::QueryInterface(This=%p, riid=%08X, obj=%p)\n", This, (unsigned int)riid, obj);

    *obj = This;

    return S_OK;
}

ULONG __stdcall ddraw_AddRef(IDirectDrawImpl *This)
{
    printf("DirectDraw::AddRef(This=%p)\n", This);

    This->Ref++;

    return This->Ref;
}

ULONG __stdcall ddraw_Release(IDirectDrawImpl *This)
{
    printf("DirectDraw::Release(This=%p)\n", This);

    This->Ref--;

    if(This->Ref == 0)
    {
        if (This->hWnd && This->renderer == render_dummy_main)
        {
            PostMessage(This->hWnd, WM_USER, 0, 0);
        }
        
        if(This->render.run)
        {
            EnterCriticalSection(&This->cs);
            This->render.run = FALSE;
            ReleaseSemaphore(ddraw->render.sem, 1, NULL);
            LeaveCriticalSection(&This->cs);

            WaitForSingleObject(This->render.thread, INFINITE);
            This->render.thread = NULL;
        }

        if(This->render.hDC)
        {
            ReleaseDC(This->hWnd, This->render.hDC);
            This->render.hDC = NULL;
        }
        
        if(This->render.ev)
        {
            CloseHandle(This->render.ev);
            ddraw->render.ev = NULL;
        }

        if(This->real_dll)
        {
            FreeLibrary(This->real_dll);
        }

        DeleteCriticalSection(&This->cs);

        /* restore old wndproc, subsequent ddraw creation will otherwise fail */
        SetWindowLong(This->hWnd, GWL_WNDPROC, (LONG)This->WndProc);
        HeapFree(GetProcessHeap(), 0, This);
        ddraw = NULL;
        return 0;
    }

    return This->Ref;
}

struct IDirectDrawImplVtbl iface =
{
    /* IUnknown */
    ddraw_QueryInterface,
    ddraw_AddRef,
    ddraw_Release,
    /* IDirectDrawImpl */
    ddraw_Compact,
    ddraw_CreateClipper,
    ddraw_CreatePalette,
    ddraw_CreateSurface,
    ddraw_DuplicateSurface,
    ddraw_EnumDisplayModes,
    ddraw_EnumSurfaces,
    ddraw_FlipToGDISurface,
    ddraw_GetCaps,
    ddraw_GetDisplayMode,
    ddraw_GetFourCCCodes,
    ddraw_GetGDISurface,
    ddraw_GetMonitorFrequency,
    ddraw_GetScanLine,
    ddraw_GetVerticalBlankStatus,
    ddraw_Initialize,
    ddraw_RestoreDisplayMode,
    ddraw_SetCooperativeLevel,
    ddraw_SetDisplayMode,
    ddraw_WaitForVerticalBlank
};

HRESULT WINAPI DirectDrawEnumerateA(LPDDENUMCALLBACK lpCallback, LPVOID lpContext)
{
    return DD_OK;
}

int stdout_open = 0;
HRESULT WINAPI DirectDrawCreate(GUID FAR* lpGUID, LPDIRECTDRAW FAR* lplpDD, IUnknown FAR* pUnkOuter) 
{
#if _DEBUG
    if(!stdout_open)
    {
        freopen("ra95stdout.txt", "w", stdout);
        setvbuf(stdout, NULL, _IOLBF, 1024);
        stdout_open = 1;
    }
#endif

    printf("DirectDrawCreate(lpGUID=%p, lplpDD=%p, pUnkOuter=%p)\n", lpGUID, lplpDD, pUnkOuter);

    if(ddraw)
    {
        /* FIXME: check the calling module before passing the call! */
        return ddraw->DirectDrawCreate(lpGUID, lplpDD, pUnkOuter);

        /*
        printf(" returning DDERR_DIRECTDRAWALREADYCREATED\n");
        return DDERR_DIRECTDRAWALREADYCREATED;
        */
    } 

    IDirectDrawImpl *This = (IDirectDrawImpl *)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IDirectDrawImpl));
    This->lpVtbl = &iface;
    printf(" This = %p\n", This);
    *lplpDD = (LPDIRECTDRAW)This;
    This->Ref = 0;
    ddraw_AddRef(This);

    ddraw = This;

    This->real_dll = LoadLibrary("system32\\ddraw.dll");
    if(!This->real_dll)
    {
        ddraw_Release(This);
        return DDERR_GENERIC;
    }

    This->DirectDrawCreate = (HRESULT (WINAPI *)(GUID FAR*, LPDIRECTDRAW FAR*, IUnknown FAR*))GetProcAddress(This->real_dll, "DirectDrawCreate");

    if(!This->DirectDrawCreate)
    {
        ddraw_Release(This);
        return DDERR_GENERIC;
    }

    InitializeCriticalSection(&This->cs);
    This->render.ev = CreateEvent(NULL, TRUE, FALSE, NULL);
    This->render.sem = CreateSemaphore(NULL, 0, 1, NULL);

    /* load configuration options from ddraw.ini */
    char cwd[MAX_PATH];
    char tmp[256];
    GetCurrentDirectoryA(sizeof(cwd), cwd);
    _snprintf(SettingsIniPath, sizeof(SettingsIniPath), "%s\\ddraw.ini", cwd);

    if(GetFileAttributes(SettingsIniPath) == 0xFFFFFFFF)
    {
        FILE *fh = fopen(SettingsIniPath, "w");
        fputs(
            "[ddraw]\n"
            "; stretch to custom resolution, 0 = defaults to the size game requests\n"
            "width=0\n"
            "height=0\n"
            "; override width/height and always stretch to fullscreen\n"
            "fullscreen=false\n"
            "; bits per pixel, possible values: 16, 24 and 32, 0 = auto\n"
            "bpp=0\n"
            "windowed=false\n"
            "; show window borders in windowed mode\n"
            "border=true\n"
            "; maintain aspect ratio\n"
            "maintas=false\n"
            "; use letter- or windowboxing to make a best fit\n"
            "boxing=false\n"
            "; real rendering rate, -1 = screen rate, 0 = unlimited (GDI), 0 = 125 (OpenGL), n = cap\n"
            "; Note: maxfps+GDI renderer can be used to slow the game speed down, maxfps+OpenGL will not slow it down\n"
            "maxfps=0\n"
            "; vertical synchronization, enable if you get tearing (OpenGL only)\n"
            "vsync=false\n"
            "; automatic mouse sensitivity scaling\n"
            "adjmouse=false\n"
            "; enable C&C video resize hack, auto = auto-detect game, true = forced, false = disabled\n"
            "vhack=false\n"
            "; switch between OpenGL (opengl) and software (gdi) renderers, (auto) = try opengl, fallback = gdi\n"
            "renderer=auto\n"
            "; force CPU0 affinity, avoids crashes with RA, *might* have a performance impact\n"
            "singlecpu=true\n"
            "; Window position, -1 = center to screen\n"
            "posX=-1\n"
            "posY=-1\n"
            "; Screenshot Hotkey, default = CTRL + G\n"
            "screenshotKey=G\n"
            "; Fake cursor position for games that use GetCursorPos and expect to be in fullscreen\n"
            "fakecursorpos=true\n"
            "; Hide WM_ACTIVATEAPP messages to prevent freezing on alt+tab (Carmageddon)\n"
            "noactivateapp=false\n"
            "; developer mode (don't lock the cursor)\n"
            "devmode=false\n"
            "; preliminary libretro shader support (e.g. cubic.glsl) https://github.com/libretro/glsl-shaders\n"
            "shader=\n"
            
        , fh);
        fclose(fh);
    }
    
    GetPrivateProfileStringA("ddraw", "windowed", "FALSE", tmp, sizeof(tmp), SettingsIniPath);
    if (tolower(tmp[0]) == 'n' || tolower(tmp[0]) == 'f' || tolower(tmp[0]) == 'd' || tmp[0] == '0')
    {
        This->windowed = FALSE;
    }
    else
    {
        This->windowed = TRUE;
    }

    GetPrivateProfileStringA("ddraw", "border", "TRUE", tmp, sizeof(tmp), SettingsIniPath);
    if (tolower(tmp[0]) == 'n' || tolower(tmp[0]) == 'f' || tolower(tmp[0]) == 'd' || tmp[0] == '0')
    {
        This->border = FALSE;
    }
    else
    {
        This->border = TRUE;
    }

    GetPrivateProfileStringA("ddraw", "boxing", "FALSE", tmp, sizeof(tmp), SettingsIniPath);
    if (tolower(tmp[0]) == 'n' || tolower(tmp[0]) == 'f' || tolower(tmp[0]) == 'd' || tmp[0] == '0')
    {
        This->boxing = FALSE;
    }
    else
    {
        This->boxing = TRUE;
    }
    
    GetPrivateProfileStringA("ddraw", "maintas", "FALSE", tmp, sizeof(tmp), SettingsIniPath);
    if (tolower(tmp[0]) == 'n' || tolower(tmp[0]) == 'f' || tolower(tmp[0]) == 'd' || tmp[0] == '0')
    {
        This->maintas = FALSE;
    }
    else
    {
        This->maintas = TRUE;
    }

    GetPrivateProfileStringA("ddraw", "screenshotKey", "G", tmp, sizeof(tmp), SettingsIniPath);
    ddraw->screenshotKey = toupper(tmp[0]);
    
    This->render.maxfps = GetPrivateProfileIntA("ddraw", "maxfps", 0, SettingsIniPath);
    This->render.width = GetPrivateProfileIntA("ddraw", "width", 0, SettingsIniPath);
    This->render.height = GetPrivateProfileIntA("ddraw", "height", 0, SettingsIniPath);
    WindowPosX = GetPrivateProfileIntA("ddraw", "posX", -1, SettingsIniPath);
    WindowPosY = GetPrivateProfileIntA("ddraw", "posY", -1, SettingsIniPath);
    
    GetPrivateProfileStringA("ddraw", "fullscreen", "FALSE", tmp, sizeof(tmp), SettingsIniPath);
    if (tolower(tmp[0]) == 'n' || tolower(tmp[0]) == 'f' || tolower(tmp[0]) == 'd' || tmp[0] == '0')
    {
        This->fullscreen = FALSE;
    }
    else
    {
        This->fullscreen = TRUE;
        WindowPosX = -1;
        WindowPosY = -1;
    }

    This->render.bpp = GetPrivateProfileIntA("ddraw", "bpp", 32, SettingsIniPath);
    if (This->render.bpp != 16 && This->render.bpp != 24 && This->render.bpp != 32)
    {
        This->render.bpp = 0;
    }

    GetPrivateProfileStringA("ddraw", "adjmouse", "FALSE", tmp, sizeof(tmp), SettingsIniPath);
    if (tolower(tmp[0]) == 'y' || tolower(tmp[0]) == 't' || tolower(tmp[0]) == 'e' || tmp[0] == '1')
    {
        This->adjmouse = TRUE;
    }
    else
    {
        This->adjmouse = FALSE;
    }

    GetPrivateProfileStringA("ddraw", "devmode", "FALSE", tmp, sizeof(tmp), SettingsIniPath);
    if (tolower(tmp[0]) == 'y' || tolower(tmp[0]) == 't' || tolower(tmp[0]) == 'e' || tmp[0] == '1')
    {
        This->devmode = TRUE;
    }
    else
    {
        This->devmode = FALSE;
    }

    GetPrivateProfileStringA("ddraw", "vsync", "FALSE", tmp, sizeof(tmp), SettingsIniPath);
    if (tolower(tmp[0]) == 'y' || tolower(tmp[0]) == 't' || tolower(tmp[0]) == 'e' || tmp[0] == '1')
    {
        This->vsync = TRUE;
    }
    else
    {
        This->vsync = FALSE;
    }

    GetPrivateProfileStringA("ddraw", "fakecursorpos", "TRUE", tmp, sizeof(tmp), SettingsIniPath);
    if (tolower(tmp[0]) == 'y' || tolower(tmp[0]) == 't' || tolower(tmp[0]) == 'e' || tmp[0] == '1')
    {
        This->fakecursorpos = TRUE;
    }
    else
    {
        This->fakecursorpos = FALSE;
    }
    
    GetPrivateProfileStringA("ddraw", "noactivateapp", "FALSE", tmp, sizeof(tmp), SettingsIniPath);
    if (tolower(tmp[0]) == 'y' || tolower(tmp[0]) == 't' || tolower(tmp[0]) == 'e' || tmp[0] == '1')
    {
        This->noactivateapp = TRUE;
    }
    else
    {
        This->noactivateapp = FALSE;
    }
    
    GetPrivateProfileStringA("ddraw", "vhack", "false", tmp, sizeof(tmp), SettingsIniPath);
    if (tolower(tmp[0]) == 'y' || tolower(tmp[0]) == 't' || tolower(tmp[0]) == 'e' || tmp[0] == '1')
    {
        This->vhack = 2;
    }
    else if(tolower(tmp[0]) == 'a')
    {
        This->vhack = 1;
    }
    else
    {
        This->vhack = 0;
    }

    GetPrivateProfileStringA("ddraw", "renderer", "auto", tmp, sizeof(tmp), SettingsIniPath);
    if(tolower(tmp[0]) == 'd' || tolower(tmp[0]) == 'd')
    {
        printf("DirectDrawCreate: Using dummy renderer\n");
        This->renderer = render_dummy_main;
    }
    else if(tolower(tmp[0]) == 's' || tolower(tmp[0]) == 'g')
    {
        printf("DirectDrawCreate: Using software renderer\n");
        This->renderer = render_soft_main;
    }
    else if (tolower(tmp[0]) == 'a')
    {
        printf("DirectDrawCreate: Using automatic renderer\n");
        This->renderer = render_main;
        This->autorenderer = TRUE;
    }
    else
    {
        printf("DirectDrawCreate: Using OpenGL renderer\n");
        This->renderer = render_main;
    }

    // to do: read .glslp config file instead of the shader and apply the correct settings
    GetPrivateProfileStringA("ddraw", "shader", "", This->shader, sizeof(This->shader), SettingsIniPath);

    GetPrivateProfileStringA("ddraw", "singlecpu", "true", tmp, sizeof(tmp), SettingsIniPath);
    if (tolower(tmp[0]) == 'y' || tolower(tmp[0]) == 't' || tolower(tmp[0]) == 'e' || tmp[0] == '1')
    {
        printf("DirectDrawCreate: Setting CPU0 affinity\n");
        SetProcessAffinityMask(GetCurrentProcess(), 1);
    }

    /* last minute check for cnc-plugin */
    if (GetEnvironmentVariable("DDRAW_WINDOW", tmp, sizeof(tmp)) > 0)
    {
        This->hWnd = (HWND)atoi(tmp);
        This->renderer = render_dummy_main;
        This->windowed = TRUE;

        if (GetEnvironmentVariable("DDRAW_WIDTH", tmp, sizeof(tmp)) > 0)
        {
            This->render.width = atoi(tmp);
        }

        if (GetEnvironmentVariable("DDRAW_HEIGHT", tmp, sizeof(tmp)) > 0)
        {
            This->render.height = atoi(tmp);
        }

        printf("DirectDrawCreate: Detected cnc-plugin at window %08X in %dx%d\n", (unsigned int)This->hWnd, This->render.width, This->render.height);
    }


    return DD_OK;
}