Add support for game controllers

src/game.cpp

@@ -284,6 +284,50 @@ int Game::gameLoop()
 			{
 				// handle player controls
 				updateControls(event.key.keysym.sym, false);
+
+			} else if (event.type == SDL_CONTROLLERBUTTONUP) {
+				switch (event.cbutton.button) {
+					case SDL_CONTROLLER_BUTTON_A:
+						if (state == WAITFORSTART) {
+							state = START;
+							stateTimer = 0;
+							stateVal = 0;
+						}
+						break;
+
+					case SDL_CONTROLLER_BUTTON_B:
+					case SDL_CONTROLLER_BUTTON_BACK:
+					case SDL_CONTROLLER_BUTTON_START:
+						loop = false;
+						break;
+				}
+
+			} else if (event.type == SDL_CONTROLLERAXISMOTION) {
+				switch (event.caxis.axis) {
+					case SDL_CONTROLLER_AXIS_LEFTX:
+						updateControls(
+							mapControllerAxis(
+								event.caxis.which,
+								event.caxis.axis,
+								event.caxis.value
+							),
+							event.caxis.value < -12000 || event.caxis.value > 12000
+						);
+						break;
+
+					case SDL_CONTROLLER_AXIS_TRIGGERLEFT:
+					case SDL_CONTROLLER_AXIS_TRIGGERRIGHT:
+						updateControls(
+							mapControllerAxis(
+								event.caxis.which,
+								event.caxis.axis,
+								event.caxis.value
+							),
+							event.caxis.value > 500
+						);
+						break;
+				}
+				
 			}
 		}
 
@@ -435,6 +479,43 @@ void Game::updateWorld(float t)
 
 }
 
+SDL_Keycode Game::mapControllerAxis(SDL_JoystickID joy, Uint8 axis, Sint16 value)
+{
+	int ctrl;
+
+	for(int i = 0; i < MAX_PLAYERS; i++) {
+		if (!players[i].hasController(joy))
+			continue;
+
+		// Controls in order: right, left, thrust
+		switch(axis) {
+			case SDL_CONTROLLER_AXIS_LEFTX:
+				ctrl = value > 0 ? 0 : 1;
+				break;
+
+			case SDL_CONTROLLER_AXIS_TRIGGERLEFT:
+			case SDL_CONTROLLER_AXIS_TRIGGERRIGHT:
+				ctrl = 2;
+				break;
+
+			default:
+				return SDLK_ESCAPE;
+		}
+
+		return CONTROLS[i][ctrl];
+	}
+
+	return SDLK_ESCAPE;
+}
+
+int Game::getPlayerForController(SDL_JoystickID id)
+{
+	for(int p = 0; p < MAX_LOCAL_PLAYERS; p++)
+		if (players[p].hasController(id))
+			return p;
+	return -1;
+}
+
 void Game::initViewports(int num)
 {
 	numViewports = num;

src/game.h

@@ -37,6 +37,8 @@ public:
 	
 	Level &getLevel();
 	static Game &getInstance();
+
+	int getPlayerForController(SDL_JoystickID id);
 	
 	void initViewports(int num);
 	
@@ -59,6 +61,8 @@ private:
 	
 	bool updateControls(int keysym, bool down);
 	void updateWorld(float t);
+
+	SDL_Keycode mapControllerAxis(SDL_JoystickID joy, Uint8 axis, Sint16 value);
 	
 	void resetListener();
 	void updateListener();

src/main.cpp

@@ -2,6 +2,7 @@
 
 #include "SDL.h"
 #include "SDL_opengl.h"
+//#include "SDL_gamecontroller.h"
 #include <AL/alut.h>
 #include <AL/al.h>
 #include <unistd.h>
@@ -93,7 +94,7 @@ int main(int argc, char *argv[])
 	
 	atexit(cleanup);
 
-	if(SDL_Init(SDL_INIT_VIDEO) != 0)
+	if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_GAMECONTROLLER) != 0)
 	{
 		fprintf(stderr, "Can't initialize SDL: %s\n", SDL_GetError());
 		return -1;
@@ -160,15 +161,40 @@ int main(int argc, char *argv[])
 	SDL_ShowCursor(SDL_DISABLE);
 
 	Game &game = Game::getInstance();
+
 	if(game.init(screen)) return 1;
 	if(Menu::init()) return 1;
 
+	SDL_GameController *controllers[8] = {NULL};
+	SDL_GameController *controller = NULL;
+
+	for (int i = 0, j = 0; i < SDL_NumJoysticks(); i++) {
+		if (!SDL_IsGameController(i))
+			continue;
+		
+		controller = SDL_GameControllerOpen(i);
+
+		if (controller) {
+			controllers[j++] = controller;
+
+		} else {
+			fprintf(stderr, "Could not open gamecontroller %i: %s\n", i, SDL_GetError());
+		}
+	}
+
 	Menu menu(screen);
 	while(1) {
 		if(menu.show())
-			return 0;
+			break;
 		if(game.gameLoop())
-			return 0;
+			break;
+	}
+
+	for (int i = 0; i < 8; i++) {
+		if (!controllers[i])
+			break;
+
+		SDL_GameControllerClose(controllers[i]);
 	}
 
 	SDL_GL_DeleteContext(glcontext);

src/menu.cpp

@@ -101,6 +101,51 @@ int Menu::show()
 					}
 				}
 			}
+			else if (event.type == SDL_CONTROLLERBUTTONUP) {
+				Game &game = Game::getInstance();
+
+				if (event.cbutton.button == SDL_CONTROLLER_BUTTON_A ) {
+					int p;
+
+					if ((p = game.getPlayerForController(event.cbutton.which)) == -1) {
+						// Activate the first available player
+						for(int p = 0; p < Game::MAX_LOCAL_PLAYERS; p++) {
+							Player &plr = Game::getInstance().getPlayer(p);
+
+							if (plr.isActive())
+								continue;
+							
+							togglePlayer(plr);
+							plr.setController(event.cbutton.which);
+
+							break;
+						}
+
+					} else {
+						// Player is already active, start the game
+						if (canstart)
+							rval = 0;
+					}
+
+				} else if (event.cbutton.button == SDL_CONTROLLER_BUTTON_B) {
+					// Find out if this joystick already belongs to a player
+					for(int p = 0; p < Game::MAX_LOCAL_PLAYERS; p++) {
+						Player &plr = game.getPlayer(p);
+
+						if (plr.hasController(event.cbutton.which)) {
+							togglePlayer(plr);
+							break;
+						}
+					}
+
+				} else if (event.cbutton.button == SDL_CONTROLLER_BUTTON_START) {
+					if (canstart)
+						rval = 0;
+
+				} else if (event.cbutton.button == SDL_CONTROLLER_BUTTON_BACK) {
+					rval = 1;
+				}
+			}
 		}
 	}
 
@@ -109,12 +154,15 @@ int Menu::show()
 
 void Menu::togglePlayer(int p)
 {
-	Game &game = Game::getInstance();
-	Player &plr = game.getPlayer(p);
+	togglePlayer(Game::getInstance().getPlayer(p));
+}
+
+void Menu::togglePlayer(Player &plr)
+{
 	plr.setActive(!plr.isActive());
 	int act=0;
-	for(int plr=0;plr<4;plr++) {
-		if(game.getPlayer(plr).isActive())
+	for(int p=0;p<4;p++) {
+		if(plr.isActive())
 			++act;
 	}
 	canstart = act>0;

src/menu.h

@@ -11,6 +11,7 @@ class Menu {
 		int show();
 	private:
 		void togglePlayer(int p);
+		void togglePlayer(Player &plr);
 		void drawPlayer(int p);
 		void update();
 

src/player.cpp

@@ -15,7 +15,8 @@ ALuint Player::buffer;
 float Player::engineVolume = 1.0;
 
 Player::Player()
-	: finished(false)
+	: joyid(-1),
+	finished(false)
 {
 }
 
@@ -69,6 +70,9 @@ void Player::setTexture(m3dTexture *tex)
 void Player::setActive(bool a)
 {
 	active = a;
+
+	if (!active)
+		joyid = -1;
 }
 
 void Player::setLocal(bool l)
@@ -76,10 +80,17 @@ void Player::setLocal(bool l)
 	local = l;
 }
 
+void Player::setController(SDL_JoystickID id)
+{
+	joyid = id;
+}
+
 Craft &Player::getCraft() { return craft; }
 bool Player::isActive() const { return active; }
 bool Player::isLocal() const { return local; }
 const char *Player::getName() const { return name; }
+bool Player::hasController() const { return joyid != -1; }
+bool Player::hasController(SDL_JoystickID id) const { return joyid == id; }
 
 bool Player::isFinished() const { return finished; }
 

src/player.h

@@ -1,6 +1,8 @@
 #ifndef _PLAYER_H_
 #define _PLAYER_H_
 
+#include "SDL_gamecontroller.h"
+
 class Player
 {
 public:
@@ -13,6 +15,8 @@ public:
 	void setTexture(m3dTexture *texture);
 	void setActive(bool active);
 	void setLocal(bool l);
+	void setController(SDL_JoystickID id);
+	void unsetController();
 	
 	void setColor(float r, float g, float b);
 	void setColor(const float *col);
@@ -29,6 +33,8 @@ public:
 	bool isActive() const;
 	bool isLocal() const;
     bool isFinished() const;
+	bool hasController() const;
+	bool hasController(SDL_JoystickID id) const;
     const char *getName() const;
 	
 	void drawHud(const GLint *viewport, int activePlayers, int num);
@@ -46,6 +52,8 @@ private:
 	
 	Craft craft;
 
+	SDL_JoystickID joyid;
+
 	bool active;
 	bool local;
 	bool finished;