First pass at Windows multi-touch gesture support

src/video/win32/SDL_win32events.c

@@ -27,6 +27,7 @@
 #include "SDL_syswm.h"
 #include "SDL_vkeys.h"
 #include "../../events/SDL_events_c.h"
+#include "../../events/SDL_touch_c.h"
 
 
 
@@ -55,13 +56,11 @@
 #ifndef WM_INPUT
 #define WM_INPUT 0x00ff
 #endif
-#ifndef WM_GESTURE
-#define WM_GESTURE 0x0119
-#endif
 #ifndef WM_TOUCH
 #define WM_TOUCH 0x0240
 #endif
 
+
 static WPARAM
 RemapVKEY(WPARAM wParam, LPARAM lParam)
 {
@@ -519,39 +518,68 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
         }
         returnCode = 0;
         break;
+
 	case WM_TOUCH:
 		{
-			//printf("Got Touch Event!\n");
+			UINT i, num_inputs = LOWORD(wParam);
+			PTOUCHINPUT inputs = SDL_stack_alloc(TOUCHINPUT, num_inputs);
+			if (data->videodata->GetTouchInputInfo((HTOUCHINPUT)lParam, num_inputs, inputs, sizeof(TOUCHINPUT))) {
+				RECT rect;
+				float x, y;
 
-#ifdef WMMSG_DEBUG
-			FILE *log = fopen("wmmsg.txt", "a");
-			fprintf(log, "Received Touch Message: %p ", hwnd);
-			if (msg > MAX_WMMSG) {
-				fprintf(log, "%d", msg);
-			} else {
-				fprintf(log, "%s", wmtab[msg]);
+				if (!GetClientRect(hwnd, &rect) ||
+				    (rect.right == rect.left && rect.bottom == rect.top)) {
+					break;
 				}
-			fprintf(log, "WM_TOUCH = %d -- 0x%X, 0x%X\n",msg, wParam, lParam);
-			fclose(log);
-#endif
+				ClientToScreen(hwnd, (LPPOINT) & rect);
+				ClientToScreen(hwnd, (LPPOINT) & rect + 1);
+				rect.top *= 100;
+				rect.left *= 100;
+				rect.bottom *= 100;
+				rect.right *= 100;
+
+				for (i = 0; i < num_inputs; ++i) {
+					PTOUCHINPUT input = &inputs[i];
+
+					SDL_TouchID touchId = (SDL_TouchID)input->hSource;
+					if (!SDL_GetTouch(touchId)) {
+						SDL_Touch touch;
 
+						touch.id = touchId;
+						touch.x_min = 0;
+						touch.x_max = 1;
+						touch.native_xres = touch.x_max - touch.x_min;
+						touch.y_min = 0;
+						touch.y_max = 1;
+						touch.native_yres = touch.y_max - touch.y_min;
+						touch.pressure_min = 0;
+						touch.pressure_max = 1;
+						touch.native_pressureres = touch.pressure_max - touch.pressure_min;
+
+						if (SDL_AddTouch(&touch, "") < 0) {
+							continue;
+						}
 					}
-		break;
-	case WM_GESTURE:
-		{
-			//printf("Got Touch Event!\n");
 
-#ifdef WMMSG_DEBUG
-			FILE *log = fopen("wmmsg.txt", "a");
-			fprintf(log, "Received Gesture Message: %p ", hwnd);
-			if (msg > MAX_WMMSG) {
-				fprintf(log, "%d", msg);
-			} else {
-				fprintf(log, "%s", wmtab[msg]);
+					// Get the normalized coordinates for the window
+					x = (float)(input->x - rect.left)/(rect.right - rect.left);
+					y = (float)(input->y - rect.top)/(rect.bottom - rect.top);
+
+					if (input->dwFlags & TOUCHEVENTF_DOWN) {
+						SDL_SendFingerDown(touchId, input->dwID, SDL_TRUE, x, y, 1);
 					}
-			fprintf(log, "WM_GESTURE = %d -- 0x%X, 0x%X\n",msg, wParam, lParam);
-			fclose(log);
-#endif
+					if (input->dwFlags & TOUCHEVENTF_MOVE) {
+						SDL_SendTouchMotion(touchId, input->dwID, SDL_FALSE, x, y, 1);
+					}
+					if (input->dwFlags & TOUCHEVENTF_UP) {
+						SDL_SendFingerDown(touchId, input->dwID, SDL_FALSE, x, y, 1);
+					}
+				}
+			}
+			SDL_stack_free(inputs);
+
+			data->videodata->CloseTouchInputHandle((HTOUCHINPUT)lParam);
+			return 0;
 		}
 		break;
 	}

src/video/win32/SDL_win32video.c

@@ -82,6 +82,10 @@ WIN_DeleteDevice(SDL_VideoDevice * device)
        FreeLibrary(data->hAygShell);
     }
 #endif
+	if (data->userDLL) {
+		FreeLibrary(data->userDLL);
+	}
+
     SDL_free(device->driverdata);
     SDL_free(device);
 }
@@ -155,6 +159,13 @@ WIN_CreateDevice(int devindex)
     data->CoordTransform = NULL;
 #endif
 
+	data->userDLL = LoadLibrary(TEXT("USER32.DLL"));
+	if (data->userDLL) {
+		data->CloseTouchInputHandle = (BOOL (WINAPI *)( HTOUCHINPUT )) GetProcAddress(data->userDLL, "CloseTouchInputHandle");
+		data->GetTouchInputInfo = (BOOL (WINAPI *)( HTOUCHINPUT, UINT, PTOUCHINPUT, int )) GetProcAddress(data->userDLL, "GetTouchInputInfo");
+		data->RegisterTouchWindow = (BOOL (WINAPI *)( HWND, ULONG )) GetProcAddress(data->userDLL, "RegisterTouchWindow");
+	}
+
     /* Set the function pointers */
     device->VideoInit = WIN_VideoInit;
     device->VideoQuit = WIN_VideoQuit;

src/video/win32/SDL_win32video.h

@@ -80,6 +80,32 @@ extern void WIN_SetError(const char *prefix);
 
 enum { RENDER_NONE, RENDER_D3D, RENDER_DDRAW, RENDER_GDI, RENDER_GAPI, RENDER_RAW };
 
+#if WINVER < 0x0601
+/* Touch input definitions */
+#define TWF_FINETOUCH	1
+#define TWF_WANTPALM	2
+
+#define TOUCHEVENTF_MOVE 0x0001
+#define TOUCHEVENTF_DOWN 0x0002
+#define TOUCHEVENTF_UP   0x0004
+
+DECLARE_HANDLE(HTOUCHINPUT);
+
+typedef struct _TOUCHINPUT {
+	LONG      x;
+	LONG      y;
+	HANDLE    hSource;
+	DWORD     dwID;
+	DWORD     dwFlags;
+	DWORD     dwMask;
+	DWORD     dwTime;
+	ULONG_PTR dwExtraInfo;
+	DWORD     cxContact;
+	DWORD     cyContact;
+} TOUCHINPUT, *PTOUCHINPUT;
+
+#endif /* WINVER < 0x0601 */
+
 typedef BOOL  (*PFNSHFullScreen)(HWND, DWORD);
 typedef void  (*PFCoordTransform)(SDL_Window*, POINT*);
 
@@ -137,6 +163,12 @@ typedef struct SDL_VideoData
     const SDL_scancode *key_layout;
 	DWORD clipboard_count;
 
+	/* Touch input functions */
+	HANDLE userDLL;
+	BOOL (WINAPI *CloseTouchInputHandle)( HTOUCHINPUT );
+	BOOL (WINAPI *GetTouchInputInfo)( HTOUCHINPUT, UINT, PTOUCHINPUT, int );
+	BOOL (WINAPI *RegisterTouchWindow)( HWND, ULONG );
+
     SDL_bool ime_com_initialized;
     struct ITfThreadMgr *ime_threadmgr;
     SDL_bool ime_initialized;

src/video/win32/SDL_win32window.c

@@ -144,6 +144,9 @@ SetupWindowData(_THIS, SDL_Window * window, HWND hwnd, SDL_bool created)
         }
     }
 
+	/* Enable multi-touch */
+	videodata->RegisterTouchWindow(hwnd, (TWF_FINETOUCH|TWF_WANTPALM));
+
     /* All done! */
     window->driverdata = data;
     return 0;