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#pragma once
struct InputMouseXlib {
Input& input;
InputMouseXlib(Input& input) : input(input) {}
shared_pointer<HID::Mouse> hid{new HID::Mouse};
uintptr handle = 0;
Display* display = nullptr;
Window rootWindow = 0;
Cursor invisibleCursor = 0;
u32 screenWidth = 0;
u32 screenHeight = 0;
struct Mouse {
bool acquired = false;
s32 numerator = 0;
s32 denominator = 0;
s32 threshold = 0;
u32 relativeX = 0;
u32 relativeY = 0;
bool ignoreNextCenter = false;
} ms;
auto acquired() -> bool {
return ms.acquired;
}
auto acquire() -> bool {
if(acquired()) return true;
if(XGrabPointer(display, handle, True, 0, GrabModeAsync, GrabModeAsync, rootWindow, invisibleCursor, CurrentTime) == GrabSuccess) {
//backup existing cursor acceleration settings
XGetPointerControl(display, &ms.numerator, &ms.denominator, &ms.threshold);
//disable cursor acceleration
XChangePointerControl(display, True, False, 1, 1, 0);
//center cursor (so that first relative poll returns 0, 0 if mouse has not moved)
XWarpPointer(display, None, rootWindow, 0, 0, 0, 0, screenWidth / 2, screenHeight / 2);
return ms.acquired = true;
} else {
return ms.acquired = false;
}
}
auto release() -> bool {
if(acquired()) {
//restore cursor acceleration and release cursor
XChangePointerControl(display, True, True, ms.numerator, ms.denominator, ms.threshold);
XUngrabPointer(display, CurrentTime);
ms.acquired = false;
}
return true;
}
auto assign(u32 groupID, u32 inputID, s16 value) -> void {
auto& group = hid->group(groupID);
if(group.input(inputID).value() == value) return;
input.doChange(hid, groupID, inputID, group.input(inputID).value(), value);
group.input(inputID).setValue(value);
}
auto poll(vector<shared_pointer<HID::Device>>& devices) -> void {
Window rootReturn;
Window childReturn;
s32 rootXReturn = 0;
s32 rootYReturn = 0;
s32 windowXReturn = 0;
s32 windowYReturn = 0;
u32 maskReturn = 0;
XQueryPointer(display, handle, &rootReturn, &childReturn, &rootXReturn, &rootYReturn, &windowXReturn, &windowYReturn, &maskReturn);
if(acquired()) {
XWindowAttributes attributes;
XGetWindowAttributes(display, handle, &attributes);
if (!ms.ignoreNextCenter || (rootXReturn != screenWidth / 2) || (rootYReturn != screenHeight / 2)) {
//absolute -> relative conversion
assign(HID::Mouse::GroupID::Axis, 0, (s16)(rootXReturn - screenWidth / 2));
assign(HID::Mouse::GroupID::Axis, 1, (s16)(rootYReturn - screenHeight / 2));
if(hid->axes().input(0).value() != 0 || hid->axes().input(1).value() != 0) {
//if mouse moved, re-center mouse for next poll
XWarpPointer(display, None, rootWindow, 0, 0, 0, 0, screenWidth / 2, screenHeight / 2);
// XWarpPointer generates an event and results in this method getting called
// again pretty soon, but the second time there is no movement (since the mouse is centered)
// and the initial relative motion values are replaced by zeros.
//
// If the above occurs before the controller code has copied the value, the motion never
// reach the game.
//
// This flag is used to workaround the above issue.
ms.ignoreNextCenter = true;
}
} else {
ms.ignoreNextCenter = false;
}
} else {
assign(HID::Mouse::GroupID::Axis, 0, (s16)(rootXReturn - ms.relativeX));
assign(HID::Mouse::GroupID::Axis, 1, (s16)(rootYReturn - ms.relativeY));
ms.relativeX = rootXReturn;
ms.relativeY = rootYReturn;
}
assign(HID::Mouse::GroupID::Button, 0, (bool)(maskReturn & Button1Mask));
assign(HID::Mouse::GroupID::Button, 1, (bool)(maskReturn & Button2Mask));
assign(HID::Mouse::GroupID::Button, 2, (bool)(maskReturn & Button3Mask));
assign(HID::Mouse::GroupID::Button, 3, (bool)(maskReturn & Button4Mask));
assign(HID::Mouse::GroupID::Button, 4, (bool)(maskReturn & Button5Mask));
devices.append(hid);
}
auto initialize(uintptr handle) -> bool {
terminate();
if(!handle) return false;
this->handle = handle;
display = XOpenDisplay(0);
rootWindow = DefaultRootWindow(display);
XWindowAttributes attributes;
XGetWindowAttributes(display, rootWindow, &attributes);
screenWidth = attributes.width;
screenHeight = attributes.height;
//Xlib: because XShowCursor(display, false) would just be too easy
//create invisible cursor for use when mouse is acquired
Pixmap pixmap;
XColor black, unused;
static char invisibleData[8] = {0};
Colormap colormap = DefaultColormap(display, DefaultScreen(display));
XAllocNamedColor(display, colormap, "black", &black, &unused);
pixmap = XCreateBitmapFromData(display, handle, invisibleData, 8, 8);
invisibleCursor = XCreatePixmapCursor(display, pixmap, pixmap, &black, &black, 0, 0);
XFreePixmap(display, pixmap);
XFreeColors(display, colormap, &black.pixel, 1, 0);
ms.acquired = false;
ms.relativeX = 0;
ms.relativeY = 0;
hid->setVendorID(HID::Mouse::GenericVendorID);
hid->setProductID(HID::Mouse::GenericProductID);
hid->setPathID(0);
hid->axes().append("X");
hid->axes().append("Y");
hid->buttons().append("Left");
hid->buttons().append("Middle");
hid->buttons().append("Right");
hid->buttons().append("Up");
hid->buttons().append("Down");
return true;
}
auto terminate() -> void {
release();
if(invisibleCursor) {
XFreeCursor(display, invisibleCursor);
invisibleCursor = 0;
}
if(display) {
XCloseDisplay(display);
display = nullptr;
}
}
};
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