text: /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2017 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_VITA
  
  #include <psp2/kernel/processmgr.h>
  #include <psp2/touch.h>
  
  #include "SDL_events.h"
  #include "SDL_log.h"
  #include "SDL_vitavideo.h"
  #include "SDL_vitatouch.h"
  #include "../../events/SDL_mouse_c.h"
  #include "../../events/SDL_touch_c.h"
  
  SceTouchData touch_old[SCE_TOUCH_PORT_MAX_NUM];
  SceTouchData touch[SCE_TOUCH_PORT_MAX_NUM];
  
  SDL_FRect area_info[SCE_TOUCH_PORT_MAX_NUM];
  
  struct{
      float min;
      float range;
  } force_info[SCE_TOUCH_PORT_MAX_NUM];
  
  void 
  VITA_InitTouch(void)
  {
      sceTouchSetSamplingState(SCE_TOUCH_PORT_FRONT, SCE_TOUCH_SAMPLING_STATE_START);
      sceTouchSetSamplingState(SCE_TOUCH_PORT_BACK, SCE_TOUCH_SAMPLING_STATE_START);
      sceTouchEnableTouchForce(SCE_TOUCH_PORT_FRONT);
      sceTouchEnableTouchForce(SCE_TOUCH_PORT_BACK);
  
      for(int port = 0; port < SCE_TOUCH_PORT_MAX_NUM; port++) {
          SceTouchPanelInfo panelinfo;
          sceTouchGetPanelInfo(port, &panelinfo);
  
          area_info[port].x  = (float)panelinfo.minAaX;
          area_info[port].y  = (float)panelinfo.minAaY;
          area_info[port].w  = (float)(panelinfo.maxAaX - panelinfo.minAaX);
          area_info[port].h  = (float)(panelinfo.maxAaY - panelinfo.minAaY);
  
          force_info[port].min = (float)panelinfo.minForce;
          force_info[port].range = (float)(panelinfo.maxForce - panelinfo.minForce);
      }
  
      // Support passing both front and back touch devices in events
      SDL_AddTouch((SDL_TouchID)0, SDL_TOUCH_DEVICE_DIRECT, "Front");
      SDL_AddTouch((SDL_TouchID)1, SDL_TOUCH_DEVICE_INDIRECT_ABSOLUTE,  "Back");
  }
  
  void 
  VITA_QuitTouch(void){
      sceTouchDisableTouchForce(SCE_TOUCH_PORT_FRONT);
      sceTouchDisableTouchForce(SCE_TOUCH_PORT_BACK);
  }
  
  void 
  VITA_PollTouch(void)
  {
      SDL_FingerID finger_id = 0;
      int port;
  
      // We skip polling touch if no window is created
      if (Vita_Window == NULL)
          return;
  
      memcpy(touch_old, touch, sizeof(touch_old));
  
      for(port = 0; port < SCE_TOUCH_PORT_MAX_NUM; port++) {
          sceTouchPeek(port, &touch[port], 1);
          if (touch[port].reportNum > 0) {
              for (int i = 0; i < touch[port].reportNum; i++)
              {
                  // adjust coordinates and forces to return normalized values
                  // for the front, screen area is used as a reference (for direct touch)
                  // e.g. touch_x = 1.0 corresponds to screen_x = 960
                  // for the back panel, the active touch area is used as reference
                  float x = 0;
                  float y = 0;
                  float force = (touch[port].report[i].force - force_info[port].min) / force_info[port].range;
                  VITA_ConvertTouchXYToSDLXY(&x, &y, touch[port].report[i].x, touch[port].report[i].y, port);
                  finger_id = (SDL_FingerID) touch[port].report[i].id;
  
                  // Send an initial touch
                  SDL_SendTouch((SDL_TouchID)port,
                      finger_id,
                      Vita_Window,
                      SDL_TRUE,
                      x,
                      y,
                      force);
  
                  // Always send the motion
                  SDL_SendTouchMotion((SDL_TouchID)port,
                      finger_id,
                      Vita_Window,
                      x,
                      y,
                      force);
              }
          }
  
          // some fingers might have been let go
          if (touch_old[port].reportNum > 0) {
              for (int i = 0; i < touch_old[port].reportNum; i++) {
                  int finger_up = 1;
                  if (touch[port].reportNum > 0) {
                      for (int j = 0; j < touch[port].reportNum; j++) {
                          if (touch[port].report[j].id == touch_old[port].report[i].id ) {
                              finger_up = 0;
                          }
                      }
                  }
                  if (finger_up == 1) {
                      float x = 0;
                      float y = 0;
                      float force = (touch_old[port].report[i].force - force_info[port].min) / force_info[port].range;
                      VITA_ConvertTouchXYToSDLXY(&x, &y, touch_old[port].report[i].x, touch_old[port].report[i].y, port);
                      finger_id = (SDL_FingerID) touch_old[port].report[i].id;
                      // Finger released from screen
                      SDL_SendTouch((SDL_TouchID)port,
                          finger_id,
                          Vita_Window,
                          SDL_FALSE,
                          x,
                          y,
                          force);
                  }
              }
          }
      }
  }
  
  void VITA_ConvertTouchXYToSDLXY(float *sdl_x, float *sdl_y, int vita_x, int vita_y, int port) {
      float x = (vita_x - area_info[port].x) / area_info[port].w;
      float y = (vita_y - area_info[port].y) / area_info[port].h;
  
      x = SDL_max(x, 0.0);
      x = SDL_min(x, 1.0);
  
      y = SDL_max(y, 0.0);
      y = SDL_min(y, 1.0);
  
      *sdl_x = x;
      *sdl_y = y;
  }
  
  
  #endif /* SDL_VIDEO_DRIVER_VITA */
  
  /* vi: set ts=4 sw=4 expandtab: */
  