libretro: handle m3u format as gamepath.

Implement retro_set_initial_image.

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

source/frontends/libretro/diskcontrol.cpp

@@ -7,6 +7,8 @@
 #include "Disk.h"
 #include "Harddisk.h"
 
+#include <fstream>
+
 namespace ra2
 {
 
@@ -17,11 +19,6 @@ namespace ra2
 
   bool DiskControl::insertDisk(const std::string & filename)
   {
-    if (filename.empty())
-    {
-      return false;
-    }
-
     if (insertFloppyDisk(filename))
     {
       myIndex = 0;
@@ -34,6 +31,45 @@ namespace ra2
     return insertHardDisk(filename);
   }
 
+  bool DiskControl::insertPlaylist(const std::string & filename)
+  {
+    std::ifstream playlist(filename);
+    if (!playlist)
+    {
+      return false;
+    }
+
+    myImages.clear();
+
+    std::string line;
+    while (std::getline(playlist, line))
+    {
+      // should we trim initial spaces?
+      if (!line.empty() && line[0] != '#')
+      {
+        myImages.push_back(line);
+      }
+    }
+
+    // if we have an initial disk image, let's try to honour it
+    if (!ourInitialPath.empty() && ourInitialIndex < myImages.size() && myImages[ourInitialIndex] == ourInitialPath)
+    {
+      myIndex = ourInitialIndex;
+      // do we need to reset for next time?
+      ourInitialPath.clear();
+      ourInitialIndex = 0;
+    }
+    else
+    {
+      // insert the first image
+      myIndex = 0;
+    }
+
+    // this is safe even if myImages is empty
+    myEjected = true;
+    return setEjectedState(false);
+  }
+
   bool DiskControl::insertFloppyDisk(const std::string & filename) const
   {
     CardManager & cardManager = GetCardMgr();
@@ -206,4 +242,15 @@ namespace ra2
     }
   }
 
+  unsigned DiskControl::ourInitialIndex = 0;
+  std::string DiskControl::ourInitialPath;
+  void DiskControl::setInitialPath(unsigned index, const char *path)
+  {
+    if (path && *path)
+    {
+      ourInitialIndex = index;
+      ourInitialPath = path;
+    }
+  }
+
 }

source/frontends/libretro/diskcontrol.h

@@ -21,11 +21,15 @@ namespace ra2
     bool removeImageIndex(size_t index);
     bool addImageIndex();
 
+    // these 2 functions update the images for the Disc Control Interface
     bool insertDisk(const std::string & filename);
+    bool insertPlaylist(const std::string & filename);
 
     bool getImagePath(unsigned index, char *path, size_t len) const;
     bool getImageLabel(unsigned index, char *label, size_t len) const;
 
+    static void setInitialPath(unsigned index, const char *path);
+
   private:
     std::vector<std::string> myImages;
 
@@ -36,6 +40,9 @@ namespace ra2
     bool insertHardDisk(const std::string & filename) const;
 
     void checkState() const;
+
+    static unsigned ourInitialIndex;
+    static std::string ourInitialPath;
   };
 
 }

source/frontends/libretro/game.cpp

@@ -258,12 +258,6 @@ namespace ra2
     return myMouse[i].position;
   }
 
-  bool Game::loadGame(const std::string & path)
-  {
-    const bool ok = myDiskControl.insertDisk(path);
-    return ok;
-  }
-
   bool Game::loadSnapshot(const std::string & path)
   {
     common2::setSnapshotFilename(path, true);

source/frontends/libretro/game.h

@@ -20,7 +20,6 @@ namespace ra2
     Game();
     ~Game();
 
-    bool loadGame(const std::string & path);
     bool loadSnapshot(const std::string & path);
 
     void executeOneFrame();

source/frontends/libretro/libretro.cpp

@@ -85,8 +85,8 @@ namespace
   bool retro_set_initial_image(unsigned index, const char *path)
   {
     ra2::log_cb(RETRO_LOG_INFO, "RA2: %s (%d) = %s\n", __FUNCTION__, index, path);
-    // I have not been able to trigger this yet.
-    return false;
+    ra2::DiskControl::setInitialPath(index, path);
+    return true;
   }
 
   bool retro_get_image_path(unsigned index, char *path, size_t len)
@@ -304,16 +304,29 @@ bool retro_load_game(const retro_game_info *info)
     std::unique_ptr<ra2::Game> game(new ra2::Game());
 
     const std::string snapshotEnding = ".aws.yaml";
-    const std::string gamePath = info->path;
+    const std::string playlistEnding = ".m3u";
 
     bool ok;
-    if (endsWith(gamePath, snapshotEnding))
+
+    if (info->path && *info->path)
     {
-      ok = game->loadSnapshot(gamePath);
+      const std::string gamePath = info->path;
+      if (endsWith(gamePath, snapshotEnding))
+      {
+        ok = game->loadSnapshot(gamePath);
+      }
+      else if (endsWith(gamePath, playlistEnding))
+      {
+        ok = game->getDiskControl().insertPlaylist(gamePath);
+      }
+      else
+      {
+        ok = game->getDiskControl().insertDisk(gamePath);
+      }
     }
     else
     {
-      ok = game->loadGame(gamePath);
+      ok = false;
     }
 
     ra2::log_cb(RETRO_LOG_INFO, "Game path: %s -> %d\n", info->path, ok);