sdl: Add SDL_joystick sample

samples/sdl_joystick/Makefile

@@ -0,0 +1,10 @@
+DEBUG = y
+XBE_TITLE = sdl_joystick
+GEN_XISO = $(XBE_TITLE).iso
+SRCS += $(CURDIR)/main.cpp
+NXDK_DIR = $(CURDIR)/../..
+NXDK_SDL = y
+
+all_local: all
+
+include $(NXDK_DIR)/Makefile

samples/sdl_joystick/main.cpp

@@ -0,0 +1,46 @@
+#include <xboxrt/debug.h>
+#include <pbkit/pbkit.h>
+#include <hal/xbox.h>
+#include <SDL.h>
+
+int main() {
+  int ret = pb_init();
+  if (ret != 0) {
+    XSleep(2000);
+    return -1;
+  }
+
+  pb_show_debug_screen();
+
+  SDL_Joystick *joy;
+  SDL_InitSubSystem(SDL_INIT_JOYSTICK);
+
+  joy = SDL_JoystickOpen(0);
+
+  SDL_Event event;
+
+  const char* buttonNames[10] = {"A", "B", "X", "Y", "Black", "White", "Start", "Back", "LeftThumb", "RightThumb"};
+  const char* axisNames[6] = {"LY", "LX", "RY", "RX", "LTrigg", "RTrigg"};
+
+  debugPrint("Num joysticks    : %02i\n", SDL_NumJoysticks());
+  debugPrint("Joystick name    : %s\n", SDL_JoystickNameForIndex(0));
+  debugPrint("Number of axes   : %02i\n", SDL_JoystickNumAxes(joy));
+  debugPrint("Number of buttons: %02i\n", SDL_JoystickNumButtons(joy));
+  debugPrint("Number of balls  : %02i\n", SDL_JoystickNumBalls(joy));
+  debugPrint("Number of hats   : %02i\n", SDL_JoystickNumHats(joy));
+  debugPrint("\n");
+
+  while (true) {
+    while (SDL_PollEvent(&event)) {
+      if (event.type == SDL_JOYBUTTONDOWN) {
+        debugPrint("Button \"%s\" pressed\n", buttonNames[event.jbutton.button]);
+      } else if (event.type == SDL_JOYAXISMOTION) {
+        debugPrint("Axis %s moved, new value: %i\n", axisNames[event.jaxis.axis], event.jaxis.value);
+      }
+    }
+  }
+
+  pb_kill();
+
+  return 0;
+}