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stadia.c
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stadia.c
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/*
* stadia.c -- Routines for interacting with a Stadia controller.
*/
#include "stadia.h"
#include "hid.h"
#include <stdio.h>
#include <synchapi.h>
#include <tchar.h>
#include <windows.h>
#pragma comment(lib, "kernel32.lib")
#define STADIA_READ_TIMEOUT 10
/*
* Stadia controller vibration output report identifier.
*/
#define STADIA_VIBRATION_IDENTIFIER 0x05
static const BYTE init_vibration[5] = {STADIA_VIBRATION_IDENTIFIER, 0x00, 0x00, 0x00, 0x00};
static const DWORD dpad_map[8] =
{
STADIA_BUTTON_UP,
STADIA_BUTTON_UP | STADIA_BUTTON_RIGHT,
STADIA_BUTTON_RIGHT,
STADIA_BUTTON_RIGHT | STADIA_BUTTON_DOWN,
STADIA_BUTTON_DOWN,
STADIA_BUTTON_DOWN | STADIA_BUTTON_LEFT,
STADIA_BUTTON_LEFT,
STADIA_BUTTON_LEFT | STADIA_BUTTON_UP};
static int last_error = 0;
static DWORD WINAPI _stadia_input_thread(LPVOID lparam)
{
struct stadia_controller *controller = (struct stadia_controller *)lparam;
INT bytes_read = 0;
while (controller->active)
{
while ((bytes_read = hid_get_input_report(controller->device, STADIA_READ_TIMEOUT)) == 0)
;
if (bytes_read < 0)
{
break;
}
// check packet header
if (controller->device->input_buffer[0] != 0x03)
{
continue;
}
AcquireSRWLockExclusive(&controller->state_lock);
controller->state.buttons = STADIA_BUTTON_NONE;
controller->state.buttons |= controller->device->input_buffer[1] < 8 ? dpad_map[controller->device->input_buffer[1]] : 0;
controller->state.buttons |= (controller->device->input_buffer[2] & (1 << 7)) != 0 ? STADIA_BUTTON_RS : 0;
controller->state.buttons |= (controller->device->input_buffer[2] & (1 << 6)) != 0 ? STADIA_BUTTON_OPTIONS : 0;
controller->state.buttons |= (controller->device->input_buffer[2] & (1 << 5)) != 0 ? STADIA_BUTTON_MENU : 0;
controller->state.buttons |= (controller->device->input_buffer[2] & (1 << 4)) != 0 ? STADIA_BUTTON_STADIA_BTN : 0;
controller->state.buttons |= (controller->device->input_buffer[3] & (1 << 6)) != 0 ? STADIA_BUTTON_A : 0;
controller->state.buttons |= (controller->device->input_buffer[3] & (1 << 5)) != 0 ? STADIA_BUTTON_B : 0;
controller->state.buttons |= (controller->device->input_buffer[3] & (1 << 4)) != 0 ? STADIA_BUTTON_X : 0;
controller->state.buttons |= (controller->device->input_buffer[3] & (1 << 3)) != 0 ? STADIA_BUTTON_Y : 0;
controller->state.buttons |= (controller->device->input_buffer[3] & (1 << 2)) != 0 ? STADIA_BUTTON_LB : 0;
controller->state.buttons |= (controller->device->input_buffer[3] & (1 << 1)) != 0 ? STADIA_BUTTON_RB : 0;
controller->state.buttons |= (controller->device->input_buffer[3] & (1 << 0)) != 0 ? STADIA_BUTTON_LS : 0;
controller->state.left_stick_x = controller->device->input_buffer[4];
controller->state.left_stick_y = controller->device->input_buffer[5];
controller->state.right_stick_x = controller->device->input_buffer[6];
controller->state.right_stick_y = controller->device->input_buffer[7];
controller->state.left_trigger = controller->device->input_buffer[8];
controller->state.right_trigger = controller->device->input_buffer[9];
ReleaseSRWLockExclusive(&controller->state_lock);
stadia_update_callback(controller, &controller->state);
}
stadia_controller_destroy(controller);
return 0;
}
static DWORD WINAPI _stadia_output_thread(LPVOID lparam)
{
struct stadia_controller *controller = (struct stadia_controller *)lparam;
BYTE vibration[5] = {STADIA_VIBRATION_IDENTIFIER, 0x0, 0x0, 0x0, 0x0};
HANDLE wait_events[2] = {controller->output_event, controller->stopping_event};
while (controller->active)
{
DWORD wait_result = WaitForMultipleObjects(2, wait_events, FALSE, INFINITE);
AcquireSRWLockShared(&controller->vibration_lock);
vibration[2] = controller->big_motor;
vibration[4] = controller->small_motor;
ReleaseSRWLockShared(&controller->vibration_lock);
hid_send_output_report(controller->device, vibration, sizeof(vibration), STADIA_READ_TIMEOUT);
ResetEvent(controller->output_event);
}
hid_send_output_report(controller->device, init_vibration, sizeof(init_vibration), STADIA_READ_TIMEOUT);
return 0;
}
struct stadia_controller *stadia_controller_create(struct hid_device *device)
{
if (!hid_send_output_report(device, init_vibration, sizeof(init_vibration), STADIA_READ_TIMEOUT) <= 0)
{
last_error = STADIA_ERROR_VIBRATION_INIT_FAILURE;
// Don't error out for now.
// TODO: Fix vibration for bluetooth controllers.
//return NULL;
}
SECURITY_ATTRIBUTES security = {.nLength = sizeof(SECURITY_ATTRIBUTES),
.lpSecurityDescriptor = NULL,
.bInheritHandle = TRUE};
struct stadia_controller *controller = (struct stadia_controller *)malloc(sizeof(struct stadia_controller));
controller->device = device;
controller->active = TRUE;
// Create locks.
InitializeSRWLock(&controller->state_lock);
InitializeSRWLock(&controller->vibration_lock);
// Create events.
controller->stopping_event = CreateEvent(&security, TRUE, FALSE, NULL);
controller->output_event = CreateEvent(&security, TRUE, FALSE, NULL);
// Create threads.
controller->input_thread = CreateThread(&security, 0, _stadia_input_thread, controller, CREATE_SUSPENDED, NULL);
controller->output_thread = CreateThread(&security, 0, _stadia_output_thread, controller, CREATE_SUSPENDED, NULL);
if (controller->input_thread == NULL || controller->output_thread == NULL)
{
stadia_controller_destroy(controller);
last_error = STADIA_ERROR_THREAD_CREATE_FAILURE;
return NULL;
}
ResumeThread(controller->input_thread);
ResumeThread(controller->output_thread);
return controller;
}
void stadia_controller_set_vibration(struct stadia_controller *controller, BYTE small_motor, BYTE big_motor)
{
AcquireSRWLockExclusive(&controller->vibration_lock);
controller->small_motor = small_motor;
controller->big_motor = big_motor;
ReleaseSRWLockExclusive(&controller->vibration_lock);
SetEvent(controller->output_event);
}
void stadia_controller_destroy(struct stadia_controller *controller)
{
CancelIoEx(controller->device->handle, &controller->device->input_ol);
controller->active = FALSE;
SetEvent(controller->stopping_event);
INT thread_count = 0;
HANDLE threads[2];
WaitForMultipleObjects(2, threads, TRUE, INFINITE);
if (controller->input_thread != NULL)
{
threads[thread_count++] = controller->input_thread;
}
if (controller->output_thread != NULL)
{
threads[thread_count++] = controller->output_thread;
}
CloseHandle(controller->stopping_event);
CloseHandle(controller->output_event);
for (INT i = 0; i < thread_count; i++)
{
CloseHandle(threads[i]);
}
stadia_destroy_callback(controller);
free(controller);
}