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/**************************************************************************
*
* Copyright 2010 Luca Barbieri
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
#include <windows.h>
#include <winnt.h>
#include <X11/Xlib.h>
#include <galliumdxgi.h>
#define DLL_WINE_PREATTACH 8
#define X11DRV_ESCAPE 6789
#define X11DRV_GET_DISPLAY 0
#define X11DRV_GET_DRAWABLE 1
/* Wine works in this way: wineserver stores the all window positions
* in (somewhat fictitious) "screen coordinates", and does not itself
* interact with X11.
*
* Instead, it is the responsibliity of the owner of the X window to
* handle ConfigureNotify and inform wineserver that the window
* moved.
*
* This means that we can freely look at window positions non-atomically,
* since they won't get updated until we return and the application
* processes the Win32 message queue.
*
* Of course, if this thread doesn't own the window, we are screwed.
*
* It might be a good idea to integrate this code in winex11.drv.
*/
struct WineDXGIBackend
{
const IGalliumDXGIBackendVtbl *vtbl_IGalliumDXGIBackend;
LONG ref;
};
static void* STDMETHODCALLTYPE WineDXGIBackend_BeginPresent(
IGalliumDXGIBackend* This,
HWND hwnd,
void** pwindow,
RECT* prect,
RGNDATA** prgndata,
BOOL* ppreserve_aspect_ratio)
{
/* this is the parent HWND which actually has an X11 window associated */
HWND x11_hwnd = GetAncestor(hwnd, GA_ROOT);
HDC hdc;
RECT client_rect;
POINT x11_hwnd_origin_from_screen;
Drawable drawable;
POINT hwnd_origin_from_screen;
HRGN hrgn;
unsigned code = X11DRV_GET_DRAWABLE;
unsigned rgndata_size;
RGNDATA* rgndata;
hdc = GetDC(x11_hwnd);
ExtEscape(hdc, X11DRV_ESCAPE, sizeof(code), (LPSTR)&code, sizeof(drawable), (LPTSTR)&drawable);
GetDCOrgEx(hdc, &x11_hwnd_origin_from_screen);
ReleaseDC(x11_hwnd, hdc);
hdc = GetDC(hwnd);
GetDCOrgEx(hdc, &hwnd_origin_from_screen);
hrgn = CreateRectRgn(0, 0, 0, 0);
GetRandomRgn(hdc, hrgn, SYSRGN);
/* the coordinate system differs depending on whether Wine is
* pretending to be Win9x or WinNT, so match that behavior.
*/
if (!(GetVersion() & 0x80000000))
OffsetRgn(hrgn, -hwnd_origin_from_screen.x, -hwnd_origin_from_screen.y);
ReleaseDC(hwnd, hdc);
*pwindow = (void*)drawable;
GetClientRect(hwnd, &client_rect);
prect->left = hwnd_origin_from_screen.x - x11_hwnd_origin_from_screen.x;
prect->top = hwnd_origin_from_screen.y - x11_hwnd_origin_from_screen.y;
prect->right = prect->left + client_rect.right;
prect->bottom = prect->top + client_rect.bottom;
rgndata_size = GetRegionData(hrgn, 0, NULL);
rgndata = HeapAlloc(GetProcessHeap(), 0, rgndata_size);
GetRegionData(hrgn, rgndata_size, rgndata);
*prgndata = rgndata;
// Windows doesn't preserve the aspect ratio
// TODO: maybe let the user turn this on somehow
*ppreserve_aspect_ratio = FALSE;
DeleteObject(hrgn);
return rgndata;
}
static void STDMETHODCALLTYPE WineDXGIBackend_EndPresent(
IGalliumDXGIBackend* This,
HWND hwnd,
void *present_cookie)
{
HeapFree(GetProcessHeap(), 0, present_cookie);
}
/* Wine should switch to C++ at least to be able to implement COM interfaces in a sensible way,
* instead of this ridiculous amount of clumsy duplicated code everywhere
* C++ exists exactly to avoid having to write the following code */
static ULONG STDMETHODCALLTYPE WineDXGIBackend_AddRef(IGalliumDXGIBackend* This)
{
return InterlockedIncrement(&((struct WineDXGIBackend*)&This)->ref);
}
static ULONG STDMETHODCALLTYPE WineDXGIBackend_Release(IGalliumDXGIBackend* This)
{
ULONG v = InterlockedDecrement(&((struct WineDXGIBackend*)&This)->ref);
if(!v)
HeapFree(GetProcessHeap(), 0, This);
return v;
}
static HRESULT WINAPI WineDXGIBackend_QueryInterface(
IGalliumDXGIBackend* iface,
REFIID riid,
void** ppvObject)
{
if (IsEqualGUID(riid, &IID_IUnknown)
|| IsEqualGUID(riid, &IID_IGalliumDXGIBackend))
{
WineDXGIBackend_AddRef(iface);
*ppvObject = iface;
return S_OK;
}
return E_NOINTERFACE;
}
static IGalliumDXGIBackendVtbl WineDXGIBackend_vtbl =
{
WineDXGIBackend_QueryInterface,
WineDXGIBackend_AddRef,
WineDXGIBackend_Release,
WineDXGIBackend_BeginPresent,
WineDXGIBackend_EndPresent
};
IGalliumDXGIBackend* new_WineDXGIBackend()
{
struct WineDXGIBackend* backend = HeapAlloc(GetProcessHeap(), 0, sizeof(struct WineDXGIBackend));
backend->ref = 1;
backend->vtbl_IGalliumDXGIBackend = &WineDXGIBackend_vtbl;
return (IGalliumDXGIBackend*)backend;
}
static void install_wine_dxgi_backend()
{
IGalliumDXGIBackend* backend = new_WineDXGIBackend();
HWND root = GetDesktopWindow();
unsigned code = X11DRV_GET_DISPLAY;
Display* dpy;
HDC hdc;
hdc = GetDC(root);
ExtEscape(hdc, X11DRV_ESCAPE, sizeof(code), (LPSTR)&code, sizeof(dpy), (LPTSTR)&dpy);
ReleaseDC(root, hdc);
GalliumDXGIUseX11Display(dpy, backend);
GalliumDXGIMakeDefault();
GalliumDXGIUseNothing();
backend->lpVtbl->Release(backend);
}
BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
{
switch (fdwReason)
{
case DLL_WINE_PREATTACH:
return TRUE;
case DLL_PROCESS_ATTACH:
DisableThreadLibraryCalls(hinstDLL);
install_wine_dxgi_backend();
break;
case DLL_PROCESS_DETACH:
break;
default:
break;
}
return TRUE;
}
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