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#pragma once
struct InputJoypadSDL {
Input& input;
InputJoypadSDL(Input& input) : input(input) {}
struct Joypad {
shared_pointer<HID::Joypad> hid{new HID::Joypad};
vector<bool> axisPolled;
u32 id = 0;
SDL_Joystick* handle = nullptr;
};
vector<Joypad> joypads;
auto assign(Joypad& joypad, u32 groupID, u32 inputID, s16 value) -> void {
auto& group = joypad.hid->group(groupID);
if(group.input(inputID).value() == value) return;
if(groupID == HID::Joypad::GroupID::Axis && !joypad.axisPolled(inputID)) {
//suppress the first axis polling event, because the value can change dramatically.
//SDL seems to return 0 for all axes, until the first movement, where it jumps to the real value.
//this triggers onChange handlers to instantly bind inputs erroneously if not suppressed.
joypad.axisPolled[inputID] = true;
} else {
input.doChange(joypad.hid, groupID, inputID, group.input(inputID).value(), value);
}
group.input(inputID).setValue(value);
}
auto poll(vector<shared_pointer<HID::Device>>& devices) -> void {
SDL_JoystickUpdate();
SDL_Event event;
while(SDL_PollEvent(&event)) {
if(event.type == SDL_JOYDEVICEADDED || event.type == SDL_JOYDEVICEREMOVED) {
enumerate();
}
}
for(auto& jp : joypads) {
for(u32 n : range(jp.hid->axes().size())) {
assign(jp, HID::Joypad::GroupID::Axis, n, (s16)SDL_JoystickGetAxis(jp.handle, n));
}
for(s32 n = 0; n < (s32)jp.hid->hats().size() - 1; n += 2) {
u8 state = SDL_JoystickGetHat(jp.handle, n >> 1);
assign(jp, HID::Joypad::GroupID::Hat, n + 0, state & SDL_HAT_LEFT ? -32767 : state & SDL_HAT_RIGHT ? +32767 : 0);
assign(jp, HID::Joypad::GroupID::Hat, n + 1, state & SDL_HAT_UP ? -32767 : state & SDL_HAT_DOWN ? +32767 : 0);
}
for(u32 n : range(jp.hid->buttons().size())) {
assign(jp, HID::Joypad::GroupID::Button, n, (bool)SDL_JoystickGetButton(jp.handle, n));
}
devices.append(jp.hid);
}
}
auto initialize() -> bool {
terminate();
SDL_Init(SDL_INIT_EVENTS);
SDL_InitSubSystem(SDL_INIT_JOYSTICK);
SDL_JoystickEventState(SDL_ENABLE);
enumerate();
return true;
}
auto terminate() -> void {
for(auto& jp : joypads) {
SDL_JoystickClose(jp.handle);
}
joypads.reset();
SDL_QuitSubSystem(SDL_INIT_JOYSTICK);
}
private:
auto enumerate() -> void {
for(auto& joypad : joypads) {
SDL_JoystickClose(joypad.handle);
}
joypads.reset();
for(u32 id : range(SDL_NumJoysticks())) {
Joypad jp;
jp.id = id;
jp.handle = SDL_JoystickOpen(jp.id);
u32 axes = SDL_JoystickNumAxes(jp.handle);
u32 hats = SDL_JoystickNumHats(jp.handle) * 2;
u32 buttons = SDL_JoystickNumButtons(jp.handle);
jp.hid->setVendorID(HID::Joypad::GenericVendorID);
jp.hid->setProductID(HID::Joypad::GenericProductID);
jp.hid->setPathID(jp.id);
for(u32 n : range(axes)) jp.hid->axes().append(n);
for(u32 n : range(hats)) jp.hid->hats().append(n);
for(u32 n : range(buttons)) jp.hid->buttons().append(n);
jp.hid->setRumble(false);
joypads.append(jp);
}
SDL_JoystickUpdate();
}
};
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