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Added a relative mouse mode that uses mouse warping instead of raw input.

Browse source 
To enable this, set the environment variable SDL_MOUSE_RELATIVE_MODE_WARP to "1"

When mouse relative mode is disabled, put the cursor back where the application expects it to be, instead of where it was when relative mode was enabled.
This commit is contained in:
Sam Lantinga 2013-12-23 17:37:22 -08:00
parent 0a03232077
commit 134d56c6d9
7 changed files with 116 additions and 67 deletions
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71
src/events/SDL_mouse.c
View file

@ -23,6 +23,7 @@
/* General mouse handling code for SDL */
#include "SDL_assert.h"
#include "SDL_hints.h"
#include "SDL_timer.h"
#include "SDL_events.h"
#include "SDL_events_c.h"
@ -205,12 +206,24 @@ SDL_PrivateSendMouseMotion(SDL_Window * window, SDL_MouseID mouseID, int relativ
int yrel;
int x_max = 0, y_max = 0;
/* relative motion is calculated regarding the system cursor last position */
if (mouse->relative_mode_warp) {
int center_x = 0, center_y = 0;
SDL_GetWindowSize(window, &center_x, &center_y);
center_x /= 2;
center_y /= 2;
if (x == center_x && y == center_y) {
mouse->last_x = center_x;
mouse->last_y = center_y;
return 0;
}
SDL_WarpMouseInWindow(window, center_x, center_y);
}
if (relative) {
xrel = x;
yrel = y;
x = (mouse->last_x + x);
y = (mouse->last_y + y);
x = (mouse->last_x + xrel);
y = (mouse->last_y + yrel);
} else {
xrel = x - mouse->last_x;
yrel = y - mouse->last_y;
@ -225,7 +238,7 @@ SDL_PrivateSendMouseMotion(SDL_Window * window, SDL_MouseID mouseID, int relativ
}
/* Update internal mouse coordinates */
if (mouse->relative_mode == SDL_FALSE) {
if (!mouse->relative_mode) {
mouse->x = x;
mouse->y = y;
} else {
@ -481,21 +494,36 @@ SDL_WarpMouseInWindow(SDL_Window * window, int x, int y)
}
}
static SDL_bool
ShouldUseRelativeModeWarp(SDL_Mouse *mouse)
{
const char *hint;
if (!mouse->SetRelativeMouseMode) {
return SDL_TRUE;
}
hint = SDL_GetHint(SDL_HINT_MOUSE_RELATIVE_MODE_WARP);
if (hint) {
if (*hint == '0') {
return SDL_FALSE;
} else {
return SDL_TRUE;
}
}
return SDL_FALSE;
}
int
SDL_SetRelativeMouseMode(SDL_bool enabled)
{
SDL_Mouse *mouse = SDL_GetMouse();
SDL_Window *focusWindow = SDL_GetKeyboardFocus();
int original_x = mouse->x, original_y = mouse->y;
if (enabled == mouse->relative_mode) {
return 0;
}
if (!mouse->SetRelativeMouseMode) {
return SDL_Unsupported();
}
if (enabled && focusWindow) {
/* Center it in the focused window to prevent clicks from going through
* to background windows.
@ -504,23 +532,26 @@ SDL_SetRelativeMouseMode(SDL_bool enabled)
SDL_WarpMouseInWindow(focusWindow, focusWindow->w/2, focusWindow->h/2);
}
if (mouse->SetRelativeMouseMode(enabled) < 0) {
/* Set the relative mode */
if (!enabled && mouse->relative_mode_warp) {
mouse->relative_mode_warp = SDL_FALSE;
} else if (enabled && ShouldUseRelativeModeWarp(mouse)) {
mouse->relative_mode_warp = SDL_TRUE;
} else if (mouse->SetRelativeMouseMode(enabled) < 0) {
return -1;
}
/* Set the relative mode */
mouse->relative_mode = enabled;
if (enabled) {
/* Save the expected mouse position */
mouse->original_x = original_x;
mouse->original_y = original_y;
} else if (mouse->focus) {
/* Restore the expected mouse position */
SDL_WarpMouseInWindow(mouse->focus, mouse->original_x, mouse->original_y);
if (mouse->focus) {
SDL_UpdateWindowGrab(mouse->focus);
/* Put the cursor back to where the application expects it */
if (!enabled) {
SDL_WarpMouseInWindow(mouse->focus, mouse->x, mouse->y);
}
}
/* Flush pending mouse motion */
/* Flush pending mouse motion - ideally we would pump events, but that's not always safe */
SDL_FlushEvent(SDL_MOUSEMOTION);
/* Update cursor visibility */

3
src/events/SDL_mouse_c.h
View file

@ -73,8 +73,7 @@ typedef struct
int last_x, last_y; /* the last reported x and y coordinates */
Uint32 buttonstate;
SDL_bool relative_mode;
/* the x and y coordinates when relative mode was activated */
int original_x, original_y;
SDL_bool relative_mode_warp;
/* Data for double-click tracking */
int num_clickstates;

5
src/video/SDL_video.c
View file

@ -2055,8 +2055,9 @@ SDL_UpdateWindowGrab(SDL_Window * window)
{
if (_this->SetWindowGrab) {
SDL_bool grabbed;
if ((window->flags & SDL_WINDOW_INPUT_GRABBED) &&
(window->flags & SDL_WINDOW_INPUT_FOCUS)) {
if (SDL_GetMouse()->relative_mode_warp ||
((window->flags & SDL_WINDOW_INPUT_GRABBED) &&
(window->flags & SDL_WINDOW_INPUT_FOCUS))) {
grabbed = SDL_TRUE;
} else {
grabbed = SDL_FALSE;

87
src/video/windows/SDL_windowsevents.c
View file

@ -290,6 +290,7 @@ static void
WIN_UpdateClipCursor(SDL_Window *window)
{
SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
SDL_Mouse *mouse = SDL_GetMouse();
/* Don't clip the cursor while we're in the modal resize or move loop */
if (data->in_modal_loop) {
@ -297,7 +298,7 @@ WIN_UpdateClipCursor(SDL_Window *window)
return;
}
if (SDL_GetMouse()->relative_mode) {
if (mouse->relative_mode && !mouse->relative_mode_warp) {
LONG cx, cy;
RECT rect;
GetWindowRect(data->hwnd, &rect);
@ -312,8 +313,9 @@ WIN_UpdateClipCursor(SDL_Window *window)
rect.bottom = cy+1;
ClipCursor(&rect);
} else if ((window->flags & SDL_WINDOW_INPUT_GRABBED) &&
(window->flags & SDL_WINDOW_INPUT_FOCUS)) {
} else if (mouse->relative_mode_warp ||
((window->flags & SDL_WINDOW_INPUT_GRABBED) &&
(window->flags & SDL_WINDOW_INPUT_FOCUS))) {
RECT rect;
if (GetClientRect(data->hwnd, &rect) && !IsRectEmpty(&rect)) {
ClientToScreen(data->hwnd, (LPPOINT) & rect);
@ -426,8 +428,12 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
break;
case WM_MOUSEMOVE:
if( !SDL_GetMouse()->relative_mode )
SDL_SendMouseMotion(data->window, 0, 0, GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));
{
SDL_Mouse *mouse = SDL_GetMouse();
if (!mouse->relative_mode || mouse->relative_mode_warp) {
SDL_SendMouseMotion(data->window, 0, 0, GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));
}
}
/* don't break here, fall through to check the wParam like the button presses */
case WM_LBUTTONUP:
case WM_RBUTTONUP:
@ -437,49 +443,50 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
case WM_RBUTTONDOWN:
case WM_MBUTTONDOWN:
case WM_XBUTTONDOWN:
if( !SDL_GetMouse()->relative_mode )
WIN_CheckWParamMouseButtons( wParam, data );
{
SDL_Mouse *mouse = SDL_GetMouse();
if (!mouse->relative_mode || mouse->relative_mode_warp) {
WIN_CheckWParamMouseButtons(wParam, data);
}
}
break;
case WM_INPUT:
{
HRAWINPUT hRawInput = (HRAWINPUT)lParam;
RAWINPUT inp;
UINT size = sizeof(inp);
if(!SDL_GetMouse()->relative_mode)
break;
GetRawInputData(hRawInput, RID_INPUT, &inp, &size, sizeof(RAWINPUTHEADER));
/* Mouse data */
if(inp.header.dwType == RIM_TYPEMOUSE)
{
RAWMOUSE* mouse = &inp.data.mouse;
SDL_Mouse *mouse = SDL_GetMouse();
HRAWINPUT hRawInput = (HRAWINPUT)lParam;
RAWINPUT inp;
UINT size = sizeof(inp);
if((mouse->usFlags & 0x01) == MOUSE_MOVE_RELATIVE)
{
SDL_SendMouseMotion(data->window, 0, 1, (int)mouse->lLastX, (int)mouse->lLastY);
if (!mouse->relative_mode || mouse->relative_mode_warp) {
break;
}
else
{
/* synthesize relative moves from the abs position */
static SDL_Point initialMousePoint;
if ( initialMousePoint.x == 0 && initialMousePoint.y == 0 )
{
GetRawInputData(hRawInput, RID_INPUT, &inp, &size, sizeof(RAWINPUTHEADER));
/* Mouse data */
if (inp.header.dwType == RIM_TYPEMOUSE) {
RAWMOUSE* mouse = &inp.data.mouse;
if ((mouse->usFlags & 0x01) == MOUSE_MOVE_RELATIVE) {
SDL_SendMouseMotion(data->window, 0, 1, (int)mouse->lLastX, (int)mouse->lLastY);
} else {
/* synthesize relative moves from the abs position */
static SDL_Point initialMousePoint;
if (initialMousePoint.x == 0 && initialMousePoint.y == 0) {
initialMousePoint.x = mouse->lLastX;
initialMousePoint.y = mouse->lLastY;
}
SDL_SendMouseMotion(data->window, 0, 1, (int)(mouse->lLastX-initialMousePoint.x), (int)(mouse->lLastY-initialMousePoint.y) );
initialMousePoint.x = mouse->lLastX;
initialMousePoint.y = mouse->lLastY;
}
SDL_SendMouseMotion(data->window, 0, 1, (int)(mouse->lLastX-initialMousePoint.x), (int)(mouse->lLastY-initialMousePoint.y) );
initialMousePoint.x = mouse->lLastX;
initialMousePoint.y = mouse->lLastY;
WIN_CheckRawMouseButtons( mouse->usButtonFlags, data );
}
WIN_CheckRawMouseButtons( mouse->usButtonFlags, data );
}
break;
}
case WM_MOUSEWHEEL:
{
@ -497,8 +504,8 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
s_AccumulatedMotion += WHEEL_DELTA;
}
}
break;
}
break;
case WM_MOUSEHWHEEL:
{
@ -516,8 +523,8 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
s_AccumulatedMotion += WHEEL_DELTA;
}
}
break;
}
break;
#ifdef WM_MOUSELEAVE
case WM_MOUSELEAVE:
@ -549,8 +556,8 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
GetKeyboardState(keyboardState);
if (ToUnicode(wParam, (lParam >> 16) & 0xff, keyboardState, (LPWSTR)&utf32, 1, 0) > 0) {
WORD repitition;
for (repitition = lParam & 0xffff; repitition > 0; repitition--) {
WORD repetition;
for (repetition = lParam & 0xffff; repetition > 0; repetition--) {
WIN_ConvertUTF32toUTF8(utf32, text);
SDL_SendKeyboardText(text);
}

2
src/video/x11/SDL_x11events.c
View file

@ -698,7 +698,7 @@ X11_DispatchEvent(_THIS)
case MotionNotify:{
SDL_Mouse *mouse = SDL_GetMouse();
if(!mouse->relative_mode) {
if(!mouse->relative_mode || mouse->relative_mode_warp) {
#ifdef DEBUG_MOTION
printf("window %p: X11 motion: %d,%d\n", xevent.xmotion.x, xevent.xmotion.y);
#endif

2
src/video/x11/SDL_x11xinput2.c
View file

@ -134,7 +134,7 @@ X11_HandleXinput2Event(SDL_VideoData *videodata,XGenericEventCookie *cookie)
SDL_Mouse *mouse = SDL_GetMouse();
double relative_cords[2];
if (!mouse->relative_mode) {
if (!mouse->relative_mode || mouse->relative_mode_warp) {
return 0;
}