Add support for gamepads (hardcoded to be the first).

Signed-off-by: Andrea Odetti <mariofutire@gmail.com>

source/frontends/sa2/CMakeLists.txt

@@ -4,6 +4,7 @@ add_executable(sa2
   main.cpp
   bitmaps.cpp
   emulator.cpp
+  gamepad.cpp
   )
 
 find_package(Boost REQUIRED

source/frontends/sa2/gamepad.cpp

@@ -0,0 +1,42 @@
+#include "StdAfx.h"
+#include "frontends/sa2/gamepad.h"
+
+#include "Log.h"
+
+#define AXIS_MIN -32768
+#define AXIS_MAX 32767
+
+
+Gamepad::Gamepad(const int index)
+  : myButtonCodes(2), myAxisCodes(2)
+{
+  myController.reset(SDL_GameControllerOpen(index), SDL_GameControllerClose);
+  myButtonCodes[0] = SDL_CONTROLLER_BUTTON_A;
+  myButtonCodes[1] = SDL_CONTROLLER_BUTTON_B;
+  myAxisCodes[0] = SDL_CONTROLLER_AXIS_LEFTX;
+  myAxisCodes[1] = SDL_CONTROLLER_AXIS_LEFTY;
+}
+
+bool Gamepad::getButton(int i) const
+{
+  int value = 0;
+  if (myController)
+  {
+    value = SDL_GameControllerGetButton(myController.get(), myButtonCodes[i]);
+  }
+  return value != 0;
+}
+
+int Gamepad::getAxis(int i) const
+{
+  if (myController)
+  {
+    const int value = SDL_GameControllerGetAxis(myController.get(), myAxisCodes[i]);
+    int pdl = 255 * (value - AXIS_MIN) / (AXIS_MAX - AXIS_MIN);
+    return pdl;
+  }
+  else
+  {
+    return 0;
+  }
+}

source/frontends/sa2/gamepad.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include "linux/paddle.h"
+#include <SDL.h>
+
+#include <vector>
+#include <memory>
+
+
+class Gamepad : public Paddle
+{
+public:
+  Gamepad(const int index);
+
+  virtual bool getButton(int i) const;
+  virtual int getAxis(int i) const;
+
+private:
+  std::shared_ptr<SDL_GameController> myController;
+
+  std::vector<SDL_GameControllerButton> myButtonCodes;
+  std::vector<SDL_GameControllerAxis> myAxisCodes;
+};

source/frontends/sa2/main.cpp

@@ -11,6 +11,7 @@
 #include "frontends/common2/utils.h"
 #include "frontends/common2/programoptions.h"
 #include "frontends/sa2/emulator.h"
+#include "frontends/sa2/gamepad.h"
 
 #include "StdAfx.h"
 #include "Common.h"
@@ -159,6 +160,8 @@ void run_sdl(int argc, const char * argv [])
 
   InitializeRegistry(options);
 
+  Paddle::instance().reset(new Gamepad(0));
+
   g_nMemoryClearType = options.memclear;
 
   initialiseEmulator();
@@ -206,7 +209,7 @@ void run_sdl(int argc, const char * argv [])
 int main(int argc, const char * argv [])
 {
   //First we need to start up SDL, and make sure it went ok
-  if (SDL_Init(SDL_INIT_VIDEO) != 0)
+  if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_GAMECONTROLLER) != 0)
   {
     std::cerr << "SDL_Init Error: " << SDL_GetError() << std::endl;
     return 1;
@@ -224,6 +227,9 @@ int main(int argc, const char * argv [])
     std::cerr << e.what() << std::endl;
   }
 
+
+  // this must happen BEFORE the SDL_Quit() as otherwise we have a double free (of the game controller).
+  Paddle::instance().reset();
   SDL_Quit();
 
   return exit;