text: /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  #include "../../SDL_internal.h"
  
  #if SDL_VIDEO_DRIVER_RISCOS
  
  #include "../../events/SDL_events_c.h"
  
  #include "SDL_log.h"
  #include "SDL_riscosvideo.h"
  #include "SDL_riscosevents_c.h"
  #include "scancodes_riscos.h"
  
  #include <kernel.h>
  #include <swis.h>
  
  static SDL_Scancode
  SDL_RISCOS_translate_keycode(int keycode)
  {
      SDL_Scancode scancode = SDL_SCANCODE_UNKNOWN;
  
      if (keycode < SDL_arraysize(riscos_scancode_table)) {
          scancode = riscos_scancode_table[keycode];
  
          if (scancode == SDL_SCANCODE_UNKNOWN) {
              SDL_Log("The key you just pressed is not recognized by SDL: %d", keycode);
          }
      }
  
      return scancode;
  }
  
  void
  RISCOS_PollKeyboard(_THIS)
  {
      SDL_VideoData *driverdata = (SDL_VideoData *)_this->driverdata;
      Uint8 key = 2;
      int i;
  
      /* Check for key releases */
      for (i = 0; i < RISCOS_MAX_KEYS_PRESSED; i++) {
          if (driverdata->key_pressed[i] != 255) {
              if ((_kernel_osbyte(129, driverdata->key_pressed[i] ^ 0xff, 0xff) & 0xff) != 255) {
                  SDL_SendKeyboardKey(SDL_RELEASED, SDL_RISCOS_translate_keycode(driverdata->key_pressed[i]));
                  driverdata->key_pressed[i] = 255;
              }
          }
      }
  
      /* Check for key presses */
      while (key < 0xff) {
          SDL_bool already_pressed = SDL_FALSE;
          key = _kernel_osbyte(121, key + 1, 0) & 0xff;
          switch (key) {
          case 255:
          /* Ignore mouse keys */
          case 9:
          case 10:
          case 11:
          /* Ignore keys with multiple INKEY codes */
          case 24:
          case 40:
          case 71:
          case 87:
              break;
  
          default:
              /* Do we already know of this key? */
              for (i = 0; i < RISCOS_MAX_KEYS_PRESSED; i++) {
                  if (driverdata->key_pressed[i] == key) {
                      already_pressed = SDL_TRUE;
                      break;
                  }
              }
  
              if (!already_pressed) {
                  SDL_SendKeyboardKey(SDL_PRESSED, SDL_RISCOS_translate_keycode(key));
                  /* Record the press so we can detect release later. */
                  for (i = 0; i < RISCOS_MAX_KEYS_PRESSED; i++) {
                      if (driverdata->key_pressed[i] == 255) {
                          driverdata->key_pressed[i] = key;
                          break;
                      }
                  }
              }
          }
      }
  }
  
  static const Uint8 mouse_button_map[] = {
      SDL_BUTTON_RIGHT,
      SDL_BUTTON_MIDDLE,
      SDL_BUTTON_LEFT,
      SDL_BUTTON_X1,
      SDL_BUTTON_X2,
      SDL_BUTTON_X2 + 1,
      SDL_BUTTON_X2 + 2,
      SDL_BUTTON_X2 + 3
  };
  
  void
  RISCOS_PollMouse(_THIS)
  {
      SDL_VideoData *driverdata = (SDL_VideoData *)_this->driverdata;
      SDL_Mouse *mouse = SDL_GetMouse();
      SDL_Rect rect;
      _kernel_swi_regs regs;
      int i, x, y, buttons;
  
      if (SDL_GetDisplayBounds(0, &rect) < 0) {
          return;
      }
  
      _kernel_swi(OS_Mouse, &regs, &regs);
      x = (regs.r[0] >> 1);
      y = rect.h - (regs.r[1] >> 1);
      buttons = regs.r[2];
  
      if (mouse->x != x || mouse->y != y) {
          SDL_SendMouseMotion(mouse->focus, mouse->mouseID, 0, x, y);
      }
  
      if (driverdata->last_mouse_buttons != buttons) {
          for (i = 0; i < SDL_arraysize(mouse_button_map); i++) {
              SDL_SendMouseButton(mouse->focus, mouse->mouseID, (buttons & (1 << i)) ? SDL_PRESSED : SDL_RELEASED, mouse_button_map[i]);
          }
          driverdata->last_mouse_buttons = buttons;
      }
  }
  
  int
  RISCOS_InitEvents(_THIS)
  {
      SDL_VideoData *driverdata = (SDL_VideoData *) _this->driverdata;
      int i, status;
  
      for (i = 0; i < RISCOS_MAX_KEYS_PRESSED; i++)
          driverdata->key_pressed[i] = 255;
  
      status = (_kernel_osbyte(202, 0, 255) & 0xFF);
      SDL_ToggleModState(KMOD_NUM,    (status & (1 << 2)) == 0);
      SDL_ToggleModState(KMOD_CAPS,   (status & (1 << 4)) == 0);
      SDL_ToggleModState(KMOD_SCROLL, (status & (1 << 1)) != 0);
  
      /* Disable escape. */
      _kernel_osbyte(229, 1, 0);
  
      return 0;
  }
  
  void
  RISCOS_PumpEvents(_THIS)
  {
      RISCOS_PollMouse(_this);
      RISCOS_PollKeyboard(_this);
  }
  
  void
  RISCOS_QuitEvents(_THIS)
  {
      /* Re-enable escape. */
      _kernel_osbyte(229, 0, 0);
  }
  
  #endif /* SDL_VIDEO_DRIVER_RISCOS */
  
  /* vi: set ts=4 sw=4 expandtab: */
  