source: Daodan/src/Patches/Input.c@ 1183

#include <stdlib.h>
#include <stdarg.h>

#include "../Daodan.h"
#include "Input.h"
#include "../Oni/Oni.h"
#include "../Daodan_Config.h"
#include "../Daodan_Patch.h"
#include "Utility.h"

typedef struct {
        LItActionDescription descr;
        DDtActionEventType eventType;

        DDtCustomActionCallback callback;
        intptr_t ctx;
} DDtCustomAction;

static DDtCustomAction DDgCustomActions[100] = { 0 };

// Extra keys (make sure these don't collide with Oni's LIc_* keys)
enum {
        DDcKey_MouseButton5 = LIcKey_Max,
        DDcKey_ScrollUp,
        DDcKey_ScrollDown,
        DDcKey_ScrollLeft,
        DDcKey_ScrollRight,
};

// Enhanced version of LIgInputNames from Oni with some extra keys
static const LItInputName DDgInputNames[] = {
        // The following key names are mapped in Oni
        {"fkey1", LIcKey_FKey1}, {"fkey2", LIcKey_FKey2}, {"fkey3", LIcKey_FKey3},
        {"fkey4", LIcKey_FKey4}, {"fkey5", LIcKey_FKey5}, {"fkey6", LIcKey_FKey6},
        {"fkey7", LIcKey_FKey7}, {"fkey8", LIcKey_FKey8}, {"fkey9", LIcKey_FKey9},
        {"fkey10", LIcKey_FKey10}, {"fkey11", LIcKey_FKey11},
        {"fkey12", LIcKey_FKey12}, {"fkey13", LIcKey_FKey13},
        {"fkey14", LIcKey_FKey14}, {"fkey15", LIcKey_FKey15},
        {"backspace", LIcKey_Backspace}, {"tab", LIcKey_Tab},
        {"capslock", LIcKey_CapsLock}, {"enter", LIcKey_Enter},
        {"leftshift", LIcKey_LeftShift}, {"rightshift", LIcKey_RightShift},
        {"leftcontrol", LIcKey_LeftControl},
        {"leftwindows", 0x94}, {"leftoption", 0x94}, // Does nothing in Oni
        {"leftalt", LIcKey_LeftAlt}, {"space", ' '}, {"rightalt", LIcKey_RightAlt},
        {"rightoption", 0x97}, {"rightwindows", 0x97}, // Does nothing in Oni
        {"rightcontrol", LIcKey_RightControl}, {"printscreen", LIcKey_PrintScreen},
        {"scrolllock", LIcKey_ScrollLock}, {"pause", LIcKey_Pause},
        {"insert", LIcKey_Insert}, {"home", LIcKey_Home}, {"pageup", LIcKey_PageUp},
        {"delete", LIcKey_Delete}, {"end", LIcKey_End},
        {"pagedown", LIcKey_PageDown}, {"uparrow", LIcKey_UpArrow},
        {"leftarrow", LIcKey_LeftArrow}, {"downarrow", LIcKey_DownArrow},
        {"rightarrow", LIcKey_RightArrow}, {"numlock", LIcKey_NumLock},
        {"divide", LIcKey_Divide}, {"multiply", LIcKey_Multiply},
        {"subtract", LIcKey_Subtract}, {"add", LIcKey_Add},
        {"numpadequals", LIcKey_NumpadEquals}, {"numpadenter", LIcKey_NumpadEnter},
        {"decimal", LIcKey_Decimal}, {"numpad0", LIcKey_Numpad0},
        {"numpad1", LIcKey_Numpad1}, {"numpad2", LIcKey_Numpad2},
        {"numpad3", LIcKey_Numpad3}, {"numpad4", LIcKey_Numpad4},
        {"numpad5", LIcKey_Numpad5}, {"numpad6", LIcKey_Numpad6},
        {"numpad7", LIcKey_Numpad7}, {"numpad8", LIcKey_Numpad8},
        {"numpad9", LIcKey_Numpad9}, {"backslash", '\\'}, {"semicolon", ';'},
        {"period", '.'}, {"apostrophe", '\''}, {"slash", '/'}, {"leftbracket", '['},
        {"rightbracket", ']'}, {"comma", ','},
        {"mousebutton1", LIcKey_MouseButton1},
        {"mousebutton2", LIcKey_MouseButton2},
        {"mousebutton3", LIcKey_MouseButton3},
        {"mousebutton4", LIcKey_MouseButton4},
        {"mousexaxis", LIcKey_MouseXAxis}, {"mouseyaxis", LIcKey_MouseYAxis},
        {"mousezaxis", LIcKey_MouseZAxis},

        // Extra keys for Daodan Input
        {"mousebutton5", DDcKey_MouseButton5},
        {"scrollup", DDcKey_ScrollUp},
        {"scrolldown", DDcKey_ScrollDown},
        {"scrollleft", DDcKey_ScrollLeft},
        {"scrollright", DDcKey_ScrollRight},

        {"", 0}
};

// Enhanced version of LIgPlatform_ScanCodeToChar from Oni
static const uint8_t DDgPlatform_ScanCodeToChar[256] = {
        // The following scan codes are mapped in Oni
        [0x01] = LIcKey_Escape, [0x02] = '1', [0x03] = '2', [0x04] = '3',
        [0x05] = '4', [0x06] = '5', [0x07] = '6', [0x08] = '7', [0x09] = '8',
        [0x0a] = '9', [0x0b] = '0', [0x0c] = '-', [0x0d] = '=',
        [0x0e] = LIcKey_Backspace, [0x0f] = LIcKey_Tab, [0x10] = 'q', [0x11] = 'w',
        [0x12] = 'e', [0x13] = 'r', [0x14] = 't', [0x15] = 'y', [0x16] = 'u',
        [0x17] = 'i', [0x18] = 'o', [0x19] = 'p', [0x1a] = '[', [0x1b] = ']',
        [0x1c] = LIcKey_Enter, [0x1d] = LIcKey_LeftControl, [0x1e] = 'a',
        [0x1f] = 's', [0x20] = 'd', [0x21] = 'f', [0x22] = 'g', [0x23] = 'h',
        [0x24] = 'j', [0x25] = 'k', [0x26] = 'l', [0x27] = ';', [0x28] = '\'',
        [0x29] = '`', [0x2a] = LIcKey_LeftShift, [0x2b] = '\\', [0x2c] = 'z',
        [0x2d] = 'x', [0x2e] = 'c', [0x2f] = 'v', [0x30] = 'b', [0x31] = 'n',
        [0x32] = 'm', [0x33] = ',', [0x34] = '.', [0x35] = '/',
        [0x36] = LIcKey_RightShift, [0x37] = LIcKey_Multiply,
        [0x38] = LIcKey_LeftAlt, [0x39] = ' ', [0x3a] = LIcKey_CapsLock,
        [0x3b] = LIcKey_FKey1, [0x3c] = LIcKey_FKey2, [0x3d] = LIcKey_FKey3,
        [0x3e] = LIcKey_FKey4, [0x3f] = LIcKey_FKey5, [0x40] = LIcKey_FKey6,
        [0x41] = LIcKey_FKey7, [0x42] = LIcKey_FKey8, [0x43] = LIcKey_FKey9,
        [0x44] = LIcKey_FKey10, [0x45] = LIcKey_NumLock, [0x46] = LIcKey_ScrollLock,
        [0x47] = LIcKey_Numpad7, [0x48] = LIcKey_Numpad8, [0x49] = LIcKey_Numpad9,
        [0x4a] = LIcKey_Subtract, [0x4b] = LIcKey_Numpad4, [0x4c] = LIcKey_Numpad5,
        [0x4d] = LIcKey_Numpad6, [0x4e] = LIcKey_Add, [0x4f] = LIcKey_Numpad1,
        [0x50] = LIcKey_Numpad2, [0x51] = LIcKey_Numpad3, [0x52] = LIcKey_Numpad0,
        [0x53] = LIcKey_Decimal, [0x57] = LIcKey_FKey11, [0x58] = LIcKey_FKey12,
        [0x64] = LIcKey_FKey13, [0x65] = LIcKey_FKey14, [0x66] = LIcKey_FKey15,
        [0x8d] = LIcKey_NumpadEquals, [0x9c] = LIcKey_NumpadEnter,
        [0x9d] = LIcKey_RightControl, [0xb3] = LIcKey_NumpadComma,
        [0xb5] = LIcKey_Divide, [0xb8] = LIcKey_RightAlt, [0xc7] = LIcKey_Home,
        [0xc8] = LIcKey_UpArrow, [0xc9] = LIcKey_PageUp, [0xcb] = LIcKey_LeftArrow,
        [0xcd] = LIcKey_RightArrow, [0xcf] = LIcKey_End, [0xd0] = LIcKey_DownArrow,
        [0xd2] = LIcKey_Insert, [0xd3] = LIcKey_Delete, [0xdb] = LIcKey_LeftWindows,
        [0xdc] = LIcKey_RightWindows, [0xdd] = LIcKey_Apps,

        // Missing in Oni
        [0xd1] = LIcKey_PageDown,
};

// Set in Patches.c if the Daodan input patches are applied. This just enables
// the windows message handling for now
bool DDgUseDaodanInput = false;

// The Oni key codes that correspond to the togglable keys
static uint8_t DDgCapsOniKey = 0;
static uint8_t DDgScrollOniKey = 0;
static uint8_t DDgNumLockOniKey = 0;

// Multiplier for mouse values
static float DDgMouseSensitivity = 1.0;

// Accumulators for mouse scrolling. These are needed because some mice have
// continuous scroll wheels (not to mention touchpads.) We should only add an
// action to Oni's input if one of these accumulators exceeds +/-WHEEL_DELTA.
static int DDgWheelDelta_V = 0;
static int DDgWheelDelta_H = 0;

// UUrMachineTime_High for the last update of the accumulators. Used so they can
// be reset after a period of no scroll events.
static int64_t DDgWheelDelta_Updated = 0;

// Temporary action buffer that we build over the duration of a frame with the
// input we're going to send to the engine. This includes the accumulated
// movement of the mouse cursor and all actions (keyboard and mouse buttons)
// that were pressed this frame (but not held down from previous frames - that
// gets added later from DDgInputState.)
static LItActionBuffer DDgActionBuffer = { 0 };

// Temporary buffer containing the current state of the keyboard and mouse
// buttons, that is, if they're being held now
static char DDgInputState[256] = { 0 };

static short ONICALL DDrBinding_Add(int key, const char *name)
{
        // First try to replace an existing binding for the same key
        LItBinding *binding = NULL;
        for (int i = 0; i < 100; i++) {
                if (LIgBindingArray[i].key == key) {
                        binding = &LIgBindingArray[i];
                        break;
                }
        }

        // If there are no existing bindings for this key, find a free entry
        if (!binding) {
                for (int i = 0; i < 100; i++) {
                        if (!LIgBindingArray[i].key) {
                                binding = &LIgBindingArray[i];
                                break;
                        }
                }
        }
        // No free entries, so give up
        if (!binding)
                return 2;

        // Now try to find the action to bind to. First check Oni's built-in list
        // of actions.
        LItActionDescription *descr = NULL;
        for (int i = 0; LIgActionDescriptions[i].name[0]; i++) {
                if (!UUrString_Compare_NoCase(name, LIgActionDescriptions[i].name)) {
                        descr = &LIgActionDescriptions[i];
                        break;
                }
        }

        // Next, try Daodan's list of custom actions
        if (!descr) {
                for (int i = 0; i < ARRAY_SIZE(DDgCustomActions); i++) {
                        if (!DDgCustomActions[i].descr.name[0])
                                break;

                        if (!UUrString_Compare_NoCase(name, DDgCustomActions[i].descr.name)) {
                                descr = &DDgCustomActions[i].descr;
                                break;
                        }
                }
        }
        if (!descr)
                return 0;

        binding->key = key;
        binding->descr = descr;
        return 0;
}

static void ONICALL DDrGameState_HandleUtilityInput(GameInput *input)
{
        // Mac Oni 1.2.1 checks the cheat binds here, so we should too. Note that
        // unlike Mac Oni, which hardcodes each cheat here, we use our flexible
        // custom action system.
        for (int i = 0; i < ARRAY_SIZE(DDgCustomActions); i++) {
                if (!DDgCustomActions[i].descr.name[0])
                        break;

                uint64_t action = 1ull << DDgCustomActions[i].descr.index;
                bool active = false;

                switch (DDgCustomActions[i].eventType) {
                case DDcEventType_KeyPress:
                        if (input->ActionsPressed & action)
                                active = true;
                        break;
                case DDcEventType_KeyDown:
                        if (input->ActionsDown & action)
                                active = true;
                        break;
                }

                if (active)
                        DDgCustomActions[i].callback(DDgCustomActions[i].ctx);
        }

        // Now do everything Oni does in this function
        ONrGameState_HandleUtilityInput(input);

        // This is for show_triggervolumes. Mac Oni does this at the end of
        // HandleUtilityInput too.
        if (ONrDebugKey_WentDown(7))
                OBJgTriggerVolume_Visible = !OBJgTriggerVolume_Visible;
}

static int GetLowestFreeDigitalAction(void)
{
        // Get the digital action indexes that Oni is using right now, plus any in
        // use by our custom actions
        uint64_t used = 0;
        for (int i = 0; LIgActionDescriptions[i].name[0]; i++) {
                if (LIgActionDescriptions[i].type != LIcActionType_Digital)
                        continue;
                used |= 1ull << LIgActionDescriptions[i].index;
        }
        for (int i = 0; i < ARRAY_SIZE(DDgCustomActions); i++) {
                if (!DDgCustomActions[i].descr.name[0])
                        break;

                if (DDgCustomActions[i].descr.type != LIcActionType_Digital)
                        continue;
                used |= 1ull << DDgCustomActions[i].descr.index;
        }

        // Get the lowest unused action index and use it. This isn't totally safe
        // since Oni _might_ have "orphaned" actions that are checked in the code
        // but not bindable, but Mac Oni 1.2.1 seems to have allocated its new
        // bindings this way, including filling the gaps between eg. f12 and
        // lookmode, so we're probably fine to do the same thing.
        unsigned long lowest;
        if (BitScanForward(&lowest, ~(unsigned long)used))
                return lowest;
        if (BitScanForward(&lowest, ~(unsigned long)(used >> 32)))
                return lowest + 32;
        return -1;
}

void DDrInput_RegisterCustomAction(const char *name, DDtActionEventType type,
                                   DDtCustomActionCallback callback,
                                   intptr_t ctx)
{
        int index = GetLowestFreeDigitalAction();
        if (index < 0) {
                STARTUPMESSAGE("Registering action %s failed, maximum actions reached",
                               name);
                return;
        }

        DDtCustomAction *action;
        for (int i = 0; i < ARRAY_SIZE(DDgCustomActions); i++) {
                if (!DDgCustomActions[i].descr.name[0]) {
                        action = &DDgCustomActions[i];
                        break;
                }
        }
        if (!action) {
                STARTUPMESSAGE("Registering action %s failed, maximum actions reached",
                               name);
                return;
        }

        *action = (DDtCustomAction) {
                .descr = {
                        .type = 1,
                        .index = index,
                },
                .callback = callback,
                .ctx = ctx,
        };
        UUrString_Copy(action->descr.name, name, sizeof(action->descr.name));
}

static uint8_t VKeyToChar(UINT vkey)
{
        int sc = MapVirtualKeyA(vkey, MAPVK_VK_TO_VSC_EX);
        if ((sc & 0xff00) == 0xe000)
                sc |= 0x80;
        sc &= 0xff;
        return DDgPlatform_ScanCodeToChar[sc];
}

static int ONICALL DDrTranslate_InputName(char *name)
{
        // Mutate the source argument to convert to lowercase. It's ugly but Oni
        // does this too. Unlike Oni, we don't use tolower, since passing
        // potentially out-of-range values to tolower is undefined.
        for (char *c = name; *c; c++) {
                if (*c >= 'A' && *c <= 'Z')
                        *c = *c - 0x20;
        }

        // Single character names just use that character as the key code. Unlike
        // Oni, we restrict this to printable ASCII.
        if (strlen(name) == 1 && name[0] >= ' ' && name[0] <= '~')
                return name[0];

        // Otherwise, look up the name in DDgInputNames
        for (int i = 0; DDgInputNames[i].name[0]; i++) {
                if (!strcmp(name, DDgInputNames[i].name))
                        return DDgInputNames[i].key;
        }
        return 0;
}

static void CenterCursor(void)
{
        // This can be set to false by script. Not sure why you'd turn it off, but
        // let's respect it.
        if (!LIgCenterCursor)
                return;

        RECT rc;
        if (!GetClientRect(LIgPlatform_HWND, &rc))
                return;
        POINT mid = { rc.right / 2, rc.bottom / 2 };
        if (!ClientToScreen(LIgPlatform_HWND, &mid))
                return;
        SetCursorPos(mid.x, mid.y);
}

static void ONICALL DDrPlatform_Mode_Set(int active)
{
        // Oni's input system uses LIgPlatform_HWND instead of
        // ONgPlatformData.Window, but they should both have the same value
        DDmAssert(LIgPlatform_HWND);

        // Clear the input state when switching input modes
        for (int i = 0; i < ARRAY_SIZE(DDgInputState); i++)
                DDgInputState[i] = 0;
        DDgActionBuffer = (LItActionBuffer) { 0 };

        // Center the cursor before switching modes. Raw Input doesn't need the
        // cursor to be centered, but when switching modes, centering the cursor
        // means it will be in a predictable position for using the pause or F1
        // menu, which are centered on the screen. Also, the cursor must be inside
        // the clip region when we call ClipCursor, otherwise it doesn't work.
        CenterCursor();

        // If leaving input mode (switching from gameplay to menus,) unregister the
        // input device. Otherwise, register it.
        RegisterRawInputDevices(&(RAWINPUTDEVICE) {
                .usUsagePage = 0x01, // HID_USAGE_PAGE_GENERIC
                .usUsage = 0x02, // HID_USAGE_GENERIC_MOUSE
                .hwndTarget = LIgPlatform_HWND,
                .dwFlags = active ? 0 : RIDEV_REMOVE,
        }, 1, sizeof(RAWINPUTDEVICE));

        if (active) {
                DDgMouseSensitivity =
                        DDrConfig_GetOptOfType("windows.mousesensitivity", C_FLOAT)->value.floatVal;

                // Get the Oni key codes corresponding to the togglable keys
                DDgCapsOniKey = VKeyToChar(VK_CAPITAL);
                DDgScrollOniKey = VKeyToChar(VK_SCROLL);
                DDgNumLockOniKey = VKeyToChar(VK_NUMLOCK);

                // Clip the cursor to the window bounds when entering input mode to
                // prevent other programs being clicked in windowed mode
                RECT rc;
                if (GetClientRect(LIgPlatform_HWND, &rc)) {
                        if (MapWindowRect(LIgPlatform_HWND, NULL, &rc))
                                ClipCursor(&rc);
                }
        } else {
                ClipCursor(NULL);
        }
}

static void ONICALL DDrPlatform_InputEvent_GetMouse(int active,
                                                    LItInputEvent *event)
{
        POINT pt;
        if (!GetCursorPos(&pt))
                goto error;

        // Unlike Oni's version of this function, we support windowed mode by
        // mapping the cursor coordinates to the window's client area
        if (!ScreenToClient(LIgPlatform_HWND, &pt))
                goto error;

        *event = (LItInputEvent) { .mouse_pos = { pt.x, pt.y } };
        return;

error:
        *event = (LItInputEvent) { 0 };
        return;
}

static UUtBool ONICALL DDrPlatform_TestKey(int ch, int active)
{
        // DDrPlatform_TestKey is always called with active = LIgMode_Internal

        if (active) {
                // The input system is running, which means DDgInputState will be up to
                // date, so just use that
                return DDgInputState[ch];
        } else {
                // Use Oni's map from key codes to DirectInput scan codes to get the
                // scan code we want to test for
                int sc = 0;
                for (int i = 0; i < 256; i++) {
                        if (DDgPlatform_ScanCodeToChar[i] == ch) {
                                sc = i;
                                break;
                        }
                }
                if (!sc)
                        return UUcFalse;

                // DirectInput scan codes have 0x80 set for extended keys. Replace this
                // with an 0xe0 prefix for MapVirtualKey.
                if (sc & 0x80) {
                        sc &= 0x7f;
                        sc |= 0xe000;
                }
                int vkey = MapVirtualKeyA(sc, MAPVK_VSC_TO_VK_EX);

                // Now check if the key is down. We must use GetAsyncKeyState here
                // because DDrPlatform_TestKey can be called from anywhere, even before
                // we have a message loop or game loop. For example, it's called from
                // ONiMain to test the state of the shift key on startup.
                return (GetAsyncKeyState(vkey) & 0x8000) ? UUcTrue : UUcFalse;
        }
}

// Update DDgInputState and DDgActionBuffer with a new key state
static void SetKeyState(int key, bool down)
{
        // Keep track of held keys. Held keys are added to every buffer and they're
        // also checked in DDrPlatform_TestKey.
        DDgInputState[key] = down;

        if (down) {
                // Add the key to the next buffer. This is so key presses are never
                // dropped, even if the key is released before Oni checks the buffer.
                LIrActionBuffer_Add(&DDgActionBuffer, &(LItDeviceInput) {
                        .input = key,
                        .analog = 1.0,
                });
        }
}

static void ProcessRawInputPacket(RAWINPUT *ri)
{
        if (ri->header.dwType != RIM_TYPEMOUSE)
                return;

        // We don't handle MOUSE_MOVE_ABSOLUTE at all yet
        if (!(ri->data.mouse.usFlags & MOUSE_MOVE_ABSOLUTE)) {
                LIrActionBuffer_Add(&DDgActionBuffer, &(LItDeviceInput) {
                        .input = LIcKey_MouseXAxis,
                        .analog = (float)ri->data.mouse.lLastX * 0.25 * DDgMouseSensitivity,
                });
                LIrActionBuffer_Add(&DDgActionBuffer, &(LItDeviceInput) {
                        .input = LIcKey_MouseYAxis,
                        .analog = (float)ri->data.mouse.lLastY *
                                  (LIgMode_InvertMouse ? -0.25 : 0.25) * DDgMouseSensitivity,
                });
        }

        // Oni supports using the mouse wheel to look up and down or left and right
        // by binding mousezaxis to aim_lr or aim_ud. We don't support this
        // incredibly useful feature, but if you need it, let me know. Instead, we
        // allow scrolling to be bound to digital actions.
        if (ri->data.mouse.usButtonFlags & (RI_MOUSE_WHEEL | RI_MOUSE_HWHEEL)) {
                int64_t now = UUrMachineTime_High();
                int64_t last_updated = now - DDgWheelDelta_Updated;
                DDgWheelDelta_Updated = now;

                // Reset the accumulators if too much time has passed since the last
                // scroll event. The player is assumed to have finished scrolling.
                if (last_updated / UUrMachineTime_High_Frequency() > 0.3) {
                        DDgWheelDelta_V = 0;
                        DDgWheelDelta_H = 0;
                }

                int neg_key, pos_key;
                int *delta;
                if (ri->data.mouse.usButtonFlags & RI_MOUSE_WHEEL) {
                        neg_key = DDcKey_ScrollUp;
                        pos_key = DDcKey_ScrollDown;
                        delta = &DDgWheelDelta_V;
                } else {
                        neg_key = DDcKey_ScrollLeft;
                        pos_key = DDcKey_ScrollRight;
                        delta = &DDgWheelDelta_H;
                }

                // To support touchpad scrolling and mice with continuous scroll wheels,
                // accumulate the wheel delta and only generate an input event once it
                // crosses the WHEEL_DELTA threshold
                *delta += (short)ri->data.mouse.usButtonData;
                if (*delta >= WHEEL_DELTA) {
                        LIrActionBuffer_Add(&DDgActionBuffer, &(LItDeviceInput) {
                                .input = neg_key,
                                .analog = 1.0,
                        });

                        *delta -= (*delta / WHEEL_DELTA) * WHEEL_DELTA;
                } else if (*delta <= -WHEEL_DELTA) {
                        LIrActionBuffer_Add(&DDgActionBuffer, &(LItDeviceInput) {
                                .input = pos_key,
                                .analog = 1.0,
                        });

                        *delta -= (*delta / -WHEEL_DELTA) * -WHEEL_DELTA;
                }
        }

        // This probably doesn't obey SM_SWAPBUTTON... should it?
        if (ri->data.mouse.usButtonFlags & RI_MOUSE_LEFT_BUTTON_DOWN)
                SetKeyState(LIcKey_MouseButton1, true);
        if (ri->data.mouse.usButtonFlags & RI_MOUSE_LEFT_BUTTON_UP)
                SetKeyState(LIcKey_MouseButton1, false);
        if (ri->data.mouse.usButtonFlags & RI_MOUSE_RIGHT_BUTTON_DOWN)
                SetKeyState(LIcKey_MouseButton2, true);
        if (ri->data.mouse.usButtonFlags & RI_MOUSE_RIGHT_BUTTON_UP)
                SetKeyState(LIcKey_MouseButton2, false);
        if (ri->data.mouse.usButtonFlags & RI_MOUSE_MIDDLE_BUTTON_DOWN)
                SetKeyState(LIcKey_MouseButton3, true);
        if (ri->data.mouse.usButtonFlags & RI_MOUSE_MIDDLE_BUTTON_UP)
                SetKeyState(LIcKey_MouseButton3, false);

        // Oni supports binding this button too. It's the back button on most mice.
        if (ri->data.mouse.usButtonFlags & RI_MOUSE_BUTTON_4_DOWN)
                SetKeyState(LIcKey_MouseButton4, true);
        if (ri->data.mouse.usButtonFlags & RI_MOUSE_BUTTON_4_UP)
                SetKeyState(LIcKey_MouseButton4, false);

        // Daodan supports binding the forward button too
        if (ri->data.mouse.usButtonFlags & RI_MOUSE_BUTTON_5_DOWN)
                SetKeyState(DDcKey_MouseButton5, true);
        if (ri->data.mouse.usButtonFlags & RI_MOUSE_BUTTON_5_UP)
                SetKeyState(DDcKey_MouseButton5, false);
}

static void DrainRawInput(void)
{
        if (!LIgMode_Internal)
                return;

        UINT ri_size = 10240;
        static RAWINPUT *ri_buf = NULL;
        if (!ri_buf)
                ri_buf = calloc(1, ri_size);

        BOOL wow_hack;
        IsWow64Process(GetCurrentProcess(), &wow_hack);

        for (;;) {
                UINT count = GetRawInputBuffer(ri_buf, &ri_size, sizeof ri_buf->header);
                if (count == 0 || count == (UINT)-1)
                        return;

                RAWINPUT *ri = ri_buf;
                for (UINT i = 0; i < count; i++) {
                        // In WOW64, these structures are aligned like in Win64 and they
                        // have to be fixed to use from 32-bit code. Yes, really.
                        if (wow_hack) {
                                memmove(&ri->data, ((char *)&ri->data) + 8,
                                        ri->header.dwSize - offsetof(RAWINPUT, data) - 8);
                        }

                        ProcessRawInputPacket(ri);
                        ri = NEXTRAWINPUTBLOCK(ri);
                }
        }
}

static UUtBool ONICALL DDiPlatform_InputEvent_GetEvent(void)
{
        // Center the cursor just in case. Raw Input doesn't need it, but sometimes
        // ClipCursor doesn't work for some reason and in that case we should still
        // prevent the user from accidentally clicking on other windows.
        if (LIgMode_Internal)
                CenterCursor();

        // Do a buffered read of raw input. Apparently this is faster for high-res
        // mice. Note that we still have to handle WM_INPUT in our wndproc in case
        // a WM_INPUT message arrives during the message loop.
        DrainRawInput();

        // Oni only processes a maximum of three messages here (for performance
        // reasons?) We're actually using Windows messages for input so we need to
        // process all of them.
        MSG msg;
        while (PeekMessageA(&msg, NULL, 0, 0, PM_REMOVE)) {
                TranslateMessage(&msg);
                DispatchMessageA(&msg);
        }

        // Oni returns true here if there are still messages to process, so that
        // LIrMode_Set and LIrMode_Set_Internal can call this repeatedly to drain
        // all messages. We always drain all messages so return false.
        return UUcFalse;
}

static bool HandleWmInput(HRAWINPUT hri, WPARAM wparam)
{
        if (!LIgMode_Internal)
                return false;

        static RAWINPUT* ri = NULL;
        static UINT ri_size = 0;
        UINT minsize = 0;

        GetRawInputData(hri, RID_INPUT, NULL, &minsize, sizeof ri->header);
        if (ri_size < minsize) {
                if (ri)
                        free(ri);
                ri_size = minsize;
                ri = calloc(1, ri_size);
        }
        if (GetRawInputData(hri, RID_INPUT, ri, &ri_size, sizeof ri->header) == (UINT)-1)
                return false;

        ProcessRawInputPacket(ri);
        return true;
}

static void HandleWmWindowPosChanged(WINDOWPOS *pos)
{
        if (!LIgMode_Internal)
                return;

        CenterCursor();

        RECT rc = { pos->x, pos->y, pos->x + pos->cx, pos->y + pos->cy };
        ClipCursor(&rc);
}

static void HandleWmKeyboard(int vkey, WORD repeat_count, WORD flags)
{
        if (!LIgMode_Internal)
                return;

        bool is_extended = flags & KF_EXTENDED;
        bool is_repeat = flags & KF_REPEAT;
        bool is_up = flags & KF_UP;
        BYTE sc = LOBYTE(flags);

        // Ignore togglable keys since we handle them specially
        if (vkey == VK_CAPITAL || vkey == VK_SCROLL || vkey == VK_NUMLOCK)
                return;

        // Ignore key down messages sent because of key-repeat
        if (!is_up && is_repeat)
                return;

        // Apparently some synthetic keyboard messages can be missing the scancode,
        // so get it from the vkey
        if (!sc)
                sc = MapVirtualKeyA(vkey, MAPVK_VK_TO_VSC);

        // DirectInput scan codes have 0x80 set for extended keys, and we're using
        // a map based on Oni's DirectInput map to convert to key codes
        if (is_extended)
                sc |= 0x80;
        uint8_t ch = DDgPlatform_ScanCodeToChar[sc];
        if (!ch)
                return;

        SetKeyState(ch, !is_up);
}

bool DDrInput_WindowProc(HWND window, UINT msg, WPARAM wparam, LPARAM lparam,
                         LRESULT* res)
{
        // This is called from our own window proc for now, so we only want to use
        // it when Daodan input is enabled
        if (!DDgUseDaodanInput)
                return false;

        switch (msg) {
                case WM_INPUT:
                        if (HandleWmInput((HRAWINPUT)lparam, wparam)) {
                                *res = 0;
                                return true;
                        }
                        break;
                case WM_WINDOWPOSCHANGED:
                        HandleWmWindowPosChanged((WINDOWPOS *)lparam);
                        break;
                case WM_KEYDOWN:
                case WM_SYSKEYDOWN:
                case WM_KEYUP:
                case WM_SYSKEYUP:
                        HandleWmKeyboard(LOWORD(wparam), LOWORD(lparam), HIWORD(lparam));
                        break;
        }

        return false;
}

static void ONICALL DDrActionBuffer_Get(short* count, LItActionBuffer** buffers)
{
        // So, Oni's version of this function was totally different. In unpatched
        // Oni, action buffers were produced at 60Hz by a separate high-priority
        // input thread, LIiInterruptHandleProc, and consumed by
        // LIrActionBuffer_Get, which was called from the game loop and could
        // provide multiple outstanding action buffers to the engine at once.
        //
        // That was a problem for a couple of reasons. Firstly, the resolution of
        // Windows timers is limited by the timer frequency, which can be as low as
        // 15.6ms and in the worst case would cause a delay of 31.2ms between action
        // buffers. That meant that even if Oni was running at a steady 60 fps, the
        // input thread would provide no action buffers on a lot of frames.
        //
        // Secondly, even though Oni drained the list of pending action buffers by
        // calling DDrActionBuffer_Get on every frame, the engine only uses them
        // when the internal game time advances, and that happens on a separate 60Hz
        // timer which was totally unsynchronized with the 60Hz timer on the input
        // thread. That wasn't too much of a problem when the game loop was running
        // at less than 60 fps, but when it ran faster, the only action buffers that
        // got processed were the ones produced when the game timer and the input
        // thread timer happened to tick at the same time, meaning potentially a lot
        // of dropped input.
        //
        // Oni's input system was probably designed that way so that input would
        // still run at 60Hz even on PCs that weren't powerful enough to render at
        // 60 fps. It was a well-meaning design, but due to the aforementioned
        // flaws, we do something much different and simpler here. On the frames
        // that Oni will consume input, we generate a single action buffer inside
        // DDrActionBuffer_Get based on most up-to-date input.

        // Update ONgGameState->TargetGameTime. We use TargetGameTime to determine
        // if Oni is going to consume input on this frame. Unfortunately, in
        // unpatched Oni, the call to ONrGameState_UpdateServerTime happened after
        // LIrActionBuffer_Get. In Daodan, we NOOP out the original call and call it
        // here instead, so it runs before our code.
        ONrGameState_UpdateServerTime(ONgGameState);
        bool time_updated = ONgGameState->GameTime != ONgGameState->TargetGameTime;

        // Only produce input buffers when input is enabled. LIrActionBuffer_Get
        // does the same thing. Also only produce them when Oni will consume them.
        if (!LIgMode_Internal || !time_updated) {
                *count = 0;
                *buffers = NULL;
                return;
        }

        // Add held keys to the action buffer
        for (int i = 0; i < ARRAY_SIZE(DDgInputState); i++) {
                if (DDgInputState[i]) {
                        LIrActionBuffer_Add(&DDgActionBuffer, &(LItDeviceInput) {
                                .input = i,
                                .analog = 1.0,
                        });
                }
        }

        // Add togglable keys to the action buffer
        if (DDgCapsOniKey && (GetKeyState(VK_CAPITAL) & 0x01)) {
                LIrActionBuffer_Add(&DDgActionBuffer, &(LItDeviceInput) {
                        .input = DDgCapsOniKey,
                        .analog = 1.0,
                });
        }
        if (DDgScrollOniKey && (GetKeyState(VK_SCROLL) & 0x01)) {
                LIrActionBuffer_Add(&DDgActionBuffer, &(LItDeviceInput) {
                        .input = DDgScrollOniKey,
                        .analog = 1.0,
                });
        }
        if (DDgNumLockOniKey && (GetKeyState(VK_NUMLOCK) & 0x01)) {
                LIrActionBuffer_Add(&DDgActionBuffer, &(LItDeviceInput) {
                        .input = DDgNumLockOniKey,
                        .analog = 1.0,
                });
        }

        // Make a copy of our temporary action buffer with all the input we've
        // gathered this frame. This is the copy that Oni's engine will see.
        static LItActionBuffer buf = { 0 };
        buf = DDgActionBuffer;
        DDgActionBuffer = (LItActionBuffer) { 0 };

        *count = 1;
        *buffers = &buf;
}

void DDrInput_PatchUtilityInput(void)
{
        // Patch the call to ONrGameState_HandleUtilityInput in
        // ONrGameState_ProcessHeartbeat. This is where Oni checks a bunch of
        // miscellaneous inputs, and where Mac Oni 1.2.1 checks the cheat bindings.
        // It's also where Mac Oni toggles the show_triggervolumes flag.
        DDrPatch_MakeCall((void *)0x004fa91c, (void *)DDrGameState_HandleUtilityInput);
}

void DDrInput_PatchCustomActions(void)
{
        DDrInput_PatchUtilityInput();

        // Replace the function which adds bindings with ours, which checks the list
        // of custom bindings as well
        DDrPatch_MakeJump((void *)LIrBinding_Add, (void *)DDrBinding_Add);
}

void DDrInput_PatchDaodanInput(void)
{
        // In LIrInitialize, NOOP the call to UUrInterruptProc_Install and
        // associated error checking
        DDrPatch_NOOP((char *)(OniExe + 0x421f), 106);

        // In LIrPlatform_Initialize, NOOP the Windows version checks so we never
        // use DirectInput
        DDrPatch_NOOP((char *)(OniExe + 0x2e64), 11);

        // Replace Oni's Windows message loop with one that does buffered raw input
        // reads and processes all messages
        DDrPatch_MakeJump((void *)LIiPlatform_InputEvent_GetEvent, (void *)DDiPlatform_InputEvent_GetEvent);

        // Replace the function that gets the latest input frames
        DDrPatch_MakeJump((void *)LIrActionBuffer_Get, (void *)DDrActionBuffer_Get);

        // Replace the function that gets the mouse cursor position
        DDrPatch_MakeJump((void *)LIrPlatform_InputEvent_GetMouse, (void *)DDrPlatform_InputEvent_GetMouse);

        // Replace the function that performs platform-specific actions when the
        // input mode changes
        DDrPatch_MakeJump((void *)LIrPlatform_Mode_Set, (void *)DDrPlatform_Mode_Set);

        // Replaces the function that tests the state of keyboard keys
        DDrPatch_MakeJump((void *)LIrPlatform_TestKey, (void *)DDrPlatform_TestKey);

        // Enable extra key names in key_config.txt
        DDrPatch_MakeJump((void *)LIrTranslate_InputName, (void *)DDrTranslate_InputName);

        // Patch out the call to ONrGameState_UpdateServerTime in ONiRunGame because
        // we want to do it earlier, in DDrActionBuffer_Get
        DDrPatch_NOOP((char *)(OniExe + 0xd4708), 11);

        DDgUseDaodanInput = true;
}