Add support for setting the cache directory.

Change-Id: I2bf1874705b877a8a8262ab49b47fe8241e603d5

diff --git a/rs/java/android/renderscript/RenderScript.java b/rs/java/android/renderscript/RenderScript.java
index 5138719..126b8c7 100644
--- a/rs/java/android/renderscript/RenderScript.java
+++ b/rs/java/android/renderscript/RenderScript.java

@@ -16,6 +16,7 @@
 
 package android.renderscript;
 
+import java.io.File;
 import java.lang.reflect.Method;
 import java.util.concurrent.locks.ReentrantReadWriteLock;
 
@@ -231,6 +232,11 @@
         validate();
         rsnContextSetPriority(mContext, p);
     }
+    native void rsnContextSetCacheDir(long con, String cacheDir);
+    synchronized void nContextSetCacheDir(String cacheDir) {
+        validate();
+        rsnContextSetCacheDir(mContext, cacheDir);
+    }
     native void rsnContextDump(long con, int bits);
     synchronized void nContextDump(int bits) {
         validate();
@@ -1326,6 +1332,14 @@
         if (rs.mContext == 0) {
             throw new RSDriverException("Failed to create RS context.");
         }
+
+        // set up cache directory for entire context
+        final String CACHE_PATH = "com.android.renderscript.cache";
+        File f = new File(RenderScriptCacheDir.mCacheDir, CACHE_PATH);
+        String mCachePath = f.getAbsolutePath();
+        f.mkdirs();
+        rs.nContextSetCacheDir(mCachePath);
+
         rs.mMessageThread = new MessageThread(rs);
         rs.mMessageThread.start();
         return rs;

diff --git a/rs/jni/android_renderscript_RenderScript.cpp b/rs/jni/android_renderscript_RenderScript.cpp
index 3591199..676d94f 100644
--- a/rs/jni/android_renderscript_RenderScript.cpp
+++ b/rs/jni/android_renderscript_RenderScript.cpp

@@ -689,6 +689,17 @@
     rsContextSetPriority((RsContext)con, p);
 }
 
+static void
+nContextSetCacheDir(JNIEnv *_env, jobject _this, jlong con, jstring cacheDir)
+{
+    AutoJavaStringToUTF8 cacheDirUTF(_env, cacheDir);
+
+    if (kLogApi) {
+        ALOGD("ContextSetCacheDir, con(%p), cacheDir(%s)", (RsContext)con, cacheDirUTF.c_str());
+    }
+    rsContextSetCacheDir((RsContext)con, cacheDirUTF.c_str(), cacheDirUTF.length());
+}
+
 
 
 static void
@@ -2312,6 +2323,7 @@
 {"rsnContextCreateGL",               "(JIIIIIIIIIIIIFI)J",                    (void*)nContextCreateGL },
 {"rsnContextFinish",                 "(J)V",                                  (void*)nContextFinish },
 {"rsnContextSetPriority",            "(JI)V",                                 (void*)nContextSetPriority },
+{"rsnContextSetCacheDir",            "(JLjava/lang/String;)V",                (void*)nContextSetCacheDir },
 {"rsnContextSetSurface",             "(JIILandroid/view/Surface;)V",          (void*)nContextSetSurface },
 {"rsnContextDestroy",                "(J)V",                                  (void*)nContextDestroy },
 {"rsnContextDump",                   "(JI)V",                                 (void*)nContextDump },