hook_getasynckeystate.c

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#include <SDL3/SDL.h>
#include <windows.h>
 
#include "hooks_private.h"
 
#define GETASYNCKEYSTATE_KEY_PRESSED 0x8000
 
static const SDL_Scancode vk_to_scancode[256] = {
    ['A'] = SDL_SCANCODE_A,
    ['B'] = SDL_SCANCODE_B,
    ['C'] = SDL_SCANCODE_C,
    ['D'] = SDL_SCANCODE_D,
    ['E'] = SDL_SCANCODE_E,
    ['F'] = SDL_SCANCODE_F,
    ['G'] = SDL_SCANCODE_G,
    ['H'] = SDL_SCANCODE_H,
    ['I'] = SDL_SCANCODE_I,
    ['J'] = SDL_SCANCODE_J,
    ['K'] = SDL_SCANCODE_K,
    ['L'] = SDL_SCANCODE_L,
    ['M'] = SDL_SCANCODE_M,
    ['N'] = SDL_SCANCODE_N,
    ['O'] = SDL_SCANCODE_O,
    ['P'] = SDL_SCANCODE_P,
    ['Q'] = SDL_SCANCODE_Q,
    ['R'] = SDL_SCANCODE_R,
    ['S'] = SDL_SCANCODE_S,
    ['T'] = SDL_SCANCODE_T,
    ['U'] = SDL_SCANCODE_U,
    ['V'] = SDL_SCANCODE_V,
    ['W'] = SDL_SCANCODE_W,
    ['X'] = SDL_SCANCODE_X,
    ['Y'] = SDL_SCANCODE_Y,
    ['Z'] = SDL_SCANCODE_Z,
    ['0'] = SDL_SCANCODE_0,
    ['1'] = SDL_SCANCODE_1,
    ['2'] = SDL_SCANCODE_2,
    ['3'] = SDL_SCANCODE_3,
    ['4'] = SDL_SCANCODE_4,
    ['5'] = SDL_SCANCODE_5,
    ['6'] = SDL_SCANCODE_6,
    ['7'] = SDL_SCANCODE_7,
    ['8'] = SDL_SCANCODE_8,
    ['9'] = SDL_SCANCODE_9,
    [VK_RETURN] = SDL_SCANCODE_RETURN,
    [VK_ESCAPE] = SDL_SCANCODE_ESCAPE,
    [VK_BACK] = SDL_SCANCODE_BACKSPACE,
    [VK_TAB] = SDL_SCANCODE_TAB,
    [VK_SPACE] = SDL_SCANCODE_SPACE,
    [VK_F1] = SDL_SCANCODE_F1,
    [VK_F2] = SDL_SCANCODE_F2,
    [VK_F3] = SDL_SCANCODE_F3,
    [VK_F4] = SDL_SCANCODE_F4,
    [VK_F5] = SDL_SCANCODE_F5,
    [VK_F6] = SDL_SCANCODE_F6,
    [VK_F7] = SDL_SCANCODE_F7,
    [VK_F8] = SDL_SCANCODE_F8,
    [VK_F9] = SDL_SCANCODE_F9,
    [VK_F10] = SDL_SCANCODE_F10,
    [VK_F11] = SDL_SCANCODE_F11,
    [VK_F12] = SDL_SCANCODE_F12,
    [VK_INSERT] = SDL_SCANCODE_INSERT,
    [VK_DELETE] = SDL_SCANCODE_DELETE,
    [VK_HOME] = SDL_SCANCODE_HOME,
    [VK_END] = SDL_SCANCODE_END,
    [VK_PRIOR] = SDL_SCANCODE_PAGEUP,
    [VK_NEXT] = SDL_SCANCODE_PAGEDOWN,
    [VK_RIGHT] = SDL_SCANCODE_RIGHT,
    [VK_LEFT] = SDL_SCANCODE_LEFT,
    [VK_DOWN] = SDL_SCANCODE_DOWN,
    [VK_UP] = SDL_SCANCODE_UP,
    [VK_CONTROL] = SDL_SCANCODE_LCTRL,
    [VK_LCONTROL] = SDL_SCANCODE_LCTRL,
    [VK_RCONTROL] = SDL_SCANCODE_RCTRL,
    [VK_SHIFT] = SDL_SCANCODE_LSHIFT,
    [VK_LSHIFT] = SDL_SCANCODE_LSHIFT,
    [VK_RSHIFT] = SDL_SCANCODE_RSHIFT,
    [VK_MENU] = SDL_SCANCODE_LALT,
    [VK_LMENU] = SDL_SCANCODE_LALT,
    [VK_RMENU] = SDL_SCANCODE_RALT,
    [VK_NUMPAD0] = SDL_SCANCODE_KP_0,
    [VK_NUMPAD1] = SDL_SCANCODE_KP_1,
    [VK_NUMPAD2] = SDL_SCANCODE_KP_2,
    [VK_NUMPAD3] = SDL_SCANCODE_KP_3,
    [VK_NUMPAD4] = SDL_SCANCODE_KP_4,
    [VK_NUMPAD5] = SDL_SCANCODE_KP_5,
    [VK_NUMPAD6] = SDL_SCANCODE_KP_6,
    [VK_NUMPAD7] = SDL_SCANCODE_KP_7,
    [VK_NUMPAD8] = SDL_SCANCODE_KP_8,
    [VK_NUMPAD9] = SDL_SCANCODE_KP_9,
    [VK_MULTIPLY] = SDL_SCANCODE_KP_MULTIPLY,
    [VK_ADD] = SDL_SCANCODE_KP_PLUS,
    [VK_SUBTRACT] = SDL_SCANCODE_KP_MINUS,
    [VK_DECIMAL] = SDL_SCANCODE_KP_PERIOD,
    [VK_DIVIDE] = SDL_SCANCODE_KP_DIVIDE,
};
 
SHORT __stdcall dttr_inputs_hook_get_async_key_state_callback(int vkey) {
    if (vkey < 0 || vkey >= (int)SDL_arraysize(vk_to_scancode)) {
        return 0;
    }
 
    const SDL_Scancode scancode = vk_to_scancode[vkey];
 
    if (scancode == SDL_SCANCODE_UNKNOWN) {
        return 0;
    }
 
    const bool *keyboard_state = SDL_GetKeyboardState(NULL);
 
    return keyboard_state[scancode] ? (SHORT)GETASYNCKEYSTATE_KEY_PRESSED : 0;
}