changed mode numbers for pong and surround

src/games/supported/Pong.cpp

@@ -81,23 +81,19 @@ void PongSettings::loadState(Deserializer& ser) {
 
 // returns a list of mode that the game can be played in
 ModeVect PongSettings::getAvailableModes() {
-  ModeVect modes(getNumModes());
-  for (unsigned int i = 0; i < modes.size(); i++) {
-    modes[i] = i;
-  }
-  return modes;
+  return {1, 2};
 }
 
 // set the mode of the game
 // the given mode must be one returned by the previous function
 void PongSettings::setMode(
     game_mode_t m, System& system,
     std::unique_ptr<StellaEnvironmentWrapper> environment) {
-  if (m < getNumModes()) {
+  if (isModeSupported(m)) {
     // read the mode we are currently in
     unsigned char mode = readRam(&system, 0x96);
     // press select until the correct mode is reached
-    while (mode != m) {
+    while (mode != m - 1) {
       environment->pressSelect(2);
       mode = readRam(&system, 0x96);
     }

src/games/supported/Surround.cpp

@@ -105,16 +105,16 @@ DifficultyVect SurroundSettings::getAvailableDifficulties() {
 // https://atariage.com/manual_html_page.php?SoftwareLabelID=535
 // There are only two single player modes, the second is faster than the first.
 ModeVect SurroundSettings::getAvailableModes() {
-  return {0, 2};
+  return {2, 4};
 }
 
 void SurroundSettings::setMode(
     game_mode_t m, System& system,
     std::unique_ptr<StellaEnvironmentWrapper> environment) {
-  if (m == 0 || m == 2) {
+  if (isModeSupported(m)) {
     // Read the game mode from RAM address 0xf9.
     unsigned char mode = readRam(&system, 0xf9);
-    int desired_mode = m + 1;
+    int desired_mode = m - 1;
 
     // Press select until the correct mode is reached for single player only.
     while (mode != desired_mode) {