Android: Use JNI for getting post-processsing shaders

The Java implementation of getting the list of post-processing
shaders only looked in the Sys folder and not the User folder.
This could be fixed in the Java implementation, but it's
simpler to just call the C++ implementation instead.

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/model/PostProcessing.java

@@ -0,0 +1,15 @@
+package org.dolphinemu.dolphinemu.features.settings.model;
+
+import androidx.annotation.NonNull;
+
+public class PostProcessing
+{
+  @NonNull
+  public static native String[] getShaderList();
+
+  @NonNull
+  public static native String[] getAnaglyphShaderList();
+
+  @NonNull
+  public static native String[] getPassiveShaderList();
+}

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/ui/SettingsFragmentPresenter.java

@@ -17,6 +17,7 @@ import org.dolphinemu.dolphinemu.features.settings.model.IntSetting;
 import org.dolphinemu.dolphinemu.features.settings.model.LegacyBooleanSetting;
 import org.dolphinemu.dolphinemu.features.settings.model.LegacyIntSetting;
 import org.dolphinemu.dolphinemu.features.settings.model.LegacyStringSetting;
+import org.dolphinemu.dolphinemu.features.settings.model.PostProcessing;
 import org.dolphinemu.dolphinemu.features.settings.model.Settings;
 import org.dolphinemu.dolphinemu.features.settings.model.StringSetting;
 import org.dolphinemu.dolphinemu.features.settings.model.WiimoteProfileStringSetting;
@@ -622,11 +623,17 @@ public final class SettingsFragmentPresenter
 
     int stereoModeValue = IntSetting.GFX_STEREO_MODE.getInt(mSettings);
     final int anaglyphMode = 3;
-    String subDir = stereoModeValue == anaglyphMode ? "Anaglyph" : null;
-    String[] shaderListEntries = getShaderList(subDir);
-    String[] shaderListValues = new String[shaderListEntries.length];
-    System.arraycopy(shaderListEntries, 0, shaderListValues, 0, shaderListEntries.length);
+    String[] shaderList = stereoModeValue == anaglyphMode ?
+            PostProcessing.getAnaglyphShaderList() : PostProcessing.getShaderList();
+
+    String[] shaderListEntries = new String[shaderList.length + 1];
+    shaderListEntries[0] = mContext.getString(R.string.off);
+    System.arraycopy(shaderList, 0, shaderListEntries, 1, shaderList.length);
+
+    String[] shaderListValues = new String[shaderList.length + 1];
     shaderListValues[0] = "";
+    System.arraycopy(shaderList, 0, shaderListValues, 1, shaderList.length);
+
     sl.add(new StringSingleChoiceSetting(mContext, StringSetting.GFX_ENHANCE_POST_SHADER,
             R.string.post_processing_shader, 0, shaderListEntries, shaderListValues));
 
@@ -664,46 +671,6 @@ public final class SettingsFragmentPresenter
     }
   }
 
-  private String[] getShaderList(String subDir)
-  {
-    try
-    {
-      String shadersPath =
-              DirectoryInitialization.getDolphinInternalDirectory() + "/Shaders";
-      if (!TextUtils.isEmpty(subDir))
-      {
-        shadersPath += "/" + subDir;
-      }
-
-      File file = new File(shadersPath);
-      File[] shaderFiles = file.listFiles();
-      if (shaderFiles != null)
-      {
-        String[] result = new String[shaderFiles.length + 1];
-        result[0] = mView.getActivity().getString(R.string.off);
-        for (int i = 0; i < shaderFiles.length; i++)
-        {
-          String name = shaderFiles[i].getName();
-          int extensionIndex = name.indexOf(".glsl");
-          if (extensionIndex > 0)
-          {
-            name = name.substring(0, extensionIndex);
-          }
-          result[i + 1] = name;
-        }
-
-        return result;
-      }
-    }
-    catch (Exception ex)
-    {
-      Log.debug("[Settings] Unable to find shader files");
-      // return empty list
-    }
-
-    return new String[]{};
-  }
-
   private void addHackSettings(ArrayList<SettingsItem> sl)
   {
     sl.add(new HeaderSetting(mContext, R.string.embedded_frame_buffer, 0));

Source/Android/jni/AndroidCommon/AndroidCommon.cpp

@@ -44,7 +44,7 @@ std::vector<std::string> JStringArrayToVector(JNIEnv* env, jobjectArray array)
   return result;
 }
 
-jobjectArray JStringArrayFromVector(JNIEnv* env, std::vector<std::string> vector)
+jobjectArray VectorToJStringArray(JNIEnv* env, std::vector<std::string> vector)
 {
   jobjectArray result = env->NewObjectArray(vector.size(), IDCache::GetStringClass(), nullptr);
   for (jsize i = 0; i < vector.size(); ++i)
@@ -145,7 +145,7 @@ std::vector<std::string> DoFileSearchAndroidContent(const std::string& directory
   JNIEnv* env = IDCache::GetEnvForThread();
   jobject result = env->CallStaticObjectMethod(
       IDCache::GetContentHandlerClass(), IDCache::GetContentHandlerDoFileSearch(),
-      ToJString(env, directory), JStringArrayFromVector(env, extensions), recursive);
+      ToJString(env, directory), VectorToJStringArray(env, extensions), recursive);
   return JStringArrayToVector(env, reinterpret_cast<jobjectArray>(result));
 }
 

Source/Android/jni/AndroidCommon/AndroidCommon.h

@@ -12,7 +12,9 @@
 
 std::string GetJString(JNIEnv* env, jstring jstr);
 jstring ToJString(JNIEnv* env, const std::string& str);
+
 std::vector<std::string> JStringArrayToVector(JNIEnv* env, jobjectArray array);
+jobjectArray VectorToJStringArray(JNIEnv* env, std::vector<std::string> vector);
 
 // Returns true if the given path should be opened as Android content instead of a normal file.
 bool IsPathAndroidContent(const std::string& uri);

Source/Android/jni/CMakeLists.txt

@@ -1,10 +1,11 @@
 add_library(main SHARED
+  Config/NativeConfig.cpp
+  Config/PostProcessing.cpp
   GameList/GameFile.cpp
   GameList/GameFile.h
   GameList/GameFileCache.cpp
   IniFile.cpp
   MainAndroid.cpp
-  NativeConfig.cpp
   WiiUtils.cpp
 )
 

Source/Android/jni/Config/PostProcessing.cpp

@@ -0,0 +1,35 @@
+// Copyright 2021 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <string>
+#include <vector>
+
+#include <jni.h>
+
+#include "VideoCommon/PostProcessing.cpp"
+#include "jni/AndroidCommon/AndroidCommon.h"
+
+extern "C" {
+
+JNIEXPORT jobjectArray JNICALL
+Java_org_dolphinemu_dolphinemu_features_settings_model_PostProcessing_getShaderList(JNIEnv* env,
+                                                                                    jclass)
+{
+  return VectorToJStringArray(env, VideoCommon::PostProcessing::GetShaderList());
+}
+
+JNIEXPORT jobjectArray JNICALL
+Java_org_dolphinemu_dolphinemu_features_settings_model_PostProcessing_getAnaglyphShaderList(
+    JNIEnv* env, jclass)
+{
+  return VectorToJStringArray(env, VideoCommon::PostProcessing::GetAnaglyphShaderList());
+}
+
+JNIEXPORT jobjectArray JNICALL
+Java_org_dolphinemu_dolphinemu_features_settings_model_PostProcessing_getPassiveShaderList(
+    JNIEnv* env, jclass)
+{
+  return VectorToJStringArray(env, VideoCommon::PostProcessing::GetPassiveShaderList());
+}
+}