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Added the hint SDL_HINT_MOUSE_RELATIVE_MODE_CENTER, controlling whether the mouse should be constrained to the center of the window or the whole window in relative mode.

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For further info about the pros and cons, check out the discussion in https://github.com/libsdl-org/SDL/issues/5271
This commit is contained in:
Sam Lantinga 2022-03-18 10:07:59 -07:00
parent d3cc5764c0
commit 6c96217727
3 changed files with 61 additions and 29 deletions
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16
include/SDL_hints.h
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@ -933,6 +933,22 @@ extern "C" {
*/
#define SDL_HINT_MOUSE_NORMAL_SPEED_SCALE "SDL_MOUSE_NORMAL_SPEED_SCALE"
/**
* \brief A variable controlling whether relative mouse mode constrains the mouse to the center of the window
*
* This variable can be set to the following values:
* "0" - Relative mouse mode constrains the mouse to the window
* "1" - Relative mouse mode constrains the mouse to the center of the window
*
* Constraining to the center of the window works better for FPS games and when the
* application is running over RDP. Constraining to the whole window works better
* for 2D games and increases the chance that the mouse will be in the correct
* position when using high DPI mice.
*
* By default SDL will constrain the mouse to the center of the window
*/
#define SDL_HINT_MOUSE_RELATIVE_MODE_CENTER "SDL_MOUSE_RELATIVE_MODE_CENTER"
/**
* \brief A variable controlling whether relative mouse mode is implemented using mouse warping
*

73
src/video/windows/SDL_windowswindow.c
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@ -28,6 +28,7 @@
#include "../SDL_pixels_c.h"
#include "../../events/SDL_keyboard_c.h"
#include "../../events/SDL_mouse_c.h"
#include "../../SDL_hints_c.h"
#include "SDL_windowsvideo.h"
#include "SDL_windowswindow.h"
@ -170,6 +171,13 @@ WIN_SetWindowPositionInternal(_THIS, SDL_Window * window, UINT flags)
data->expected_resize = SDL_FALSE;
}
static void SDLCALL
WIN_MouseRelativeModeCenterChanged(void *userdata, const char *name, const char *oldValue, const char *hint)
{
SDL_WindowData *data = (SDL_WindowData *)userdata;
data->mouse_relative_mode_center = SDL_GetStringBoolean(hint, SDL_TRUE);
}
static int
SetupWindowData(_THIS, SDL_Window * window, HWND hwnd, HWND parent, SDL_bool created)
{
@ -193,6 +201,8 @@ SetupWindowData(_THIS, SDL_Window * window, HWND hwnd, HWND parent, SDL_bool cre
data->videodata = videodata;
data->initializing = SDL_TRUE;
SDL_AddHintCallback(SDL_HINT_MOUSE_RELATIVE_MODE_CENTER, WIN_MouseRelativeModeCenterChanged, data);
window->driverdata = data;
/* Associate the data with the window */
@ -297,7 +307,39 @@ SetupWindowData(_THIS, SDL_Window * window, HWND hwnd, HWND parent, SDL_bool cre
return 0;
}
static void CleanupWindowData(_THIS, SDL_Window * window)
{
SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
if (data) {
SDL_DelHintCallback(SDL_HINT_MOUSE_RELATIVE_MODE_CENTER, WIN_MouseRelativeModeCenterChanged, data);
if (data->keyboard_hook) {
UnhookWindowsHookEx(data->keyboard_hook);
}
ReleaseDC(data->hwnd, data->hdc);
RemoveProp(data->hwnd, TEXT("SDL_WindowData"));
if (data->created) {
DestroyWindow(data->hwnd);
if (data->parent) {
DestroyWindow(data->parent);
}
} else {
/* Restore any original event handler... */
if (data->wndproc != NULL) {
#ifdef GWLP_WNDPROC
SetWindowLongPtr(data->hwnd, GWLP_WNDPROC,
(LONG_PTR) data->wndproc);
#else
SetWindowLong(data->hwnd, GWL_WNDPROC,
(LONG_PTR) data->wndproc);
#endif
}
}
SDL_free(data);
}
window->driverdata = NULL;
}
int
WIN_CreateWindow(_THIS, SDL_Window * window)
@ -873,34 +915,7 @@ WIN_SetWindowKeyboardGrab(_THIS, SDL_Window * window, SDL_bool grabbed)
void
WIN_DestroyWindow(_THIS, SDL_Window * window)
{
SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
if (data) {
if (data->keyboard_hook) {
UnhookWindowsHookEx(data->keyboard_hook);
}
ReleaseDC(data->hwnd, data->hdc);
RemoveProp(data->hwnd, TEXT("SDL_WindowData"));
if (data->created) {
DestroyWindow(data->hwnd);
if (data->parent) {
DestroyWindow(data->parent);
}
} else {
/* Restore any original event handler... */
if (data->wndproc != NULL) {
#ifdef GWLP_WNDPROC
SetWindowLongPtr(data->hwnd, GWLP_WNDPROC,
(LONG_PTR) data->wndproc);
#else
SetWindowLong(data->hwnd, GWL_WNDPROC,
(LONG_PTR) data->wndproc);
#endif
}
}
SDL_free(data);
}
window->driverdata = NULL;
CleanupWindowData(_this, window);
}
SDL_bool
@ -1032,7 +1047,7 @@ WIN_UpdateClipCursor(SDL_Window *window)
if ((mouse->relative_mode || (window->flags & SDL_WINDOW_MOUSE_GRABBED) ||
(window->mouse_rect.w > 0 && window->mouse_rect.h > 0)) &&
(window->flags & SDL_WINDOW_INPUT_FOCUS)) {
if (mouse->relative_mode && !mouse->relative_mode_warp) {
if (mouse->relative_mode && !mouse->relative_mode_warp && data->mouse_relative_mode_center) {
if (GetWindowRect(data->hwnd, &rect)) {
LONG cx, cy;

1
src/video/windows/SDL_windowswindow.h
View File

@ -49,6 +49,7 @@ typedef struct
Uint8 focus_click_pending;
SDL_bool skip_update_clipcursor;
Uint32 last_updated_clipcursor;
SDL_bool mouse_relative_mode_center;
SDL_bool windowed_mode_was_maximized;
SDL_bool in_window_deactivation;
RECT cursor_clipped_rect;