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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include <malloc.h>
     18 #include <string.h>
     19 #include <pthread.h>
     20 
     21 #include "RenderScript.h"
     22 #include "rsCppStructs.h"
     23 #include "rsCppInternal.h"
     24 
     25 #include <dlfcn.h>
     26 #include <unistd.h>
     27 
     28 #if !defined(RS_SERVER) && !defined(RS_COMPATIBILITY_LIB) && defined(HAVE_ANDROID_OS)
     29 #include <cutils/properties.h>
     30 #else
     31 #include "rsCompatibilityLib.h"
     32 #endif
     33 
     34 
     35 using namespace android;
     36 using namespace RSC;
     37 
     38 bool RS::gInitialized = false;
     39 bool RS::usingNative = false;
     40 pthread_mutex_t RS::gInitMutex = PTHREAD_MUTEX_INITIALIZER;
     41 dispatchTable* RS::dispatch = nullptr;
     42 static int gInitError = 0;
     43 
     44 RS::RS() {
     45     mDev = nullptr;
     46     mContext = nullptr;
     47     mErrorFunc = nullptr;
     48     mMessageFunc = nullptr;
     49     mMessageRun = false;
     50     mInit = false;
     51     mCurrentError = RS_SUCCESS;
     52 
     53     memset(&mElements, 0, sizeof(mElements));
     54     memset(&mSamplers, 0, sizeof(mSamplers));
     55 }
     56 
     57 RS::~RS() {
     58     if (mInit == true) {
     59         mMessageRun = false;
     60 
     61         if (mContext) {
     62             RS::dispatch->ContextDeinitToClient(mContext);
     63 
     64             void *res = nullptr;
     65             int status = pthread_join(mMessageThreadId, &res);
     66 
     67             RS::dispatch->ContextDestroy(mContext);
     68             mContext = nullptr;
     69         }
     70         if (mDev) {
     71             RS::dispatch->DeviceDestroy(mDev);
     72             mDev = nullptr;
     73         }
     74     }
     75 }
     76 
     77 bool RS::init(const char * name, uint32_t flags) {
     78     return RS::init(name, RS_VERSION, flags);
     79 }
     80 
     81 // this will only open API 19+ libRS
     82 // because that's when we changed libRS to extern "C" entry points
     83 static bool loadSO(const char* filename, int targetApi) {
     84     void* handle = dlopen(filename, RTLD_LAZY | RTLD_LOCAL);
     85     if (handle == nullptr) {
     86         ALOGV("couldn't dlopen %s, %s", filename, dlerror());
     87         return false;
     88     }
     89 
     90     if (loadSymbols(handle, *RS::dispatch, targetApi) == false) {
     91         ALOGV("%s init failed!", filename);
     92         return false;
     93     }
     94     //ALOGE("Successfully loaded %s", filename);
     95     return true;
     96 }
     97 
     98 static uint32_t getProp(const char *str) {
     99 #if !defined(__LP64__) && !defined(RS_SERVER) && defined(HAVE_ANDROID_OS)
    100     char buf[256];
    101     property_get(str, buf, "0");
    102     return atoi(buf);
    103 #else
    104     return 0;
    105 #endif
    106 }
    107 
    108 bool RS::initDispatch(int targetApi) {
    109     pthread_mutex_lock(&gInitMutex);
    110     if (gInitError) {
    111         goto error;
    112     } else if (gInitialized) {
    113         pthread_mutex_unlock(&gInitMutex);
    114         return true;
    115     }
    116 
    117     RS::dispatch = new dispatchTable;
    118 
    119     // attempt to load libRS, load libRSSupport on failure
    120     // if property is set, proceed directly to libRSSupport
    121     if (getProp("debug.rs.forcecompat") == 0) {
    122         usingNative = loadSO("libRS.so", targetApi);
    123     }
    124     if (usingNative == false) {
    125         if (loadSO("libRSSupport.so", targetApi) == false) {
    126             ALOGE("Failed to load libRS.so and libRSSupport.so");
    127             goto error;
    128         }
    129     }
    130 
    131     gInitialized = true;
    132 
    133     pthread_mutex_unlock(&gInitMutex);
    134     return true;
    135 
    136  error:
    137     gInitError = 1;
    138     pthread_mutex_unlock(&gInitMutex);
    139     return false;
    140 }
    141 
    142 bool RS::init(const char * name, int targetApi, uint32_t flags) {
    143     if (mInit) {
    144         return true;
    145     }
    146 
    147     if (initDispatch(targetApi) == false) {
    148         ALOGE("Couldn't initialize dispatch table");
    149         return false;
    150     }
    151 
    152     uint32_t nameLen = strlen(name);
    153     if (nameLen > PATH_MAX) {
    154         ALOGE("The path to the cache directory is too long");
    155         return false;
    156     }
    157     memcpy(mCacheDir, name, nameLen);
    158     mCacheDir[nameLen] = 0; //add the null character even if the user does not.
    159     mCacheDirLen = nameLen + 1;
    160 
    161     mDev = RS::dispatch->DeviceCreate();
    162     if (mDev == 0) {
    163         ALOGE("Device creation failed");
    164         return false;
    165     }
    166 
    167     if (flags & ~(RS_CONTEXT_SYNCHRONOUS | RS_CONTEXT_LOW_LATENCY |
    168                   RS_CONTEXT_LOW_POWER | RS_CONTEXT_WAIT_FOR_ATTACH)) {
    169         ALOGE("Invalid flags passed");
    170         return false;
    171     }
    172 
    173     mContext = RS::dispatch->ContextCreate(mDev, 0, targetApi, RS_CONTEXT_TYPE_NORMAL, flags);
    174     if (mContext == 0) {
    175         ALOGE("Context creation failed");
    176         return false;
    177     }
    178 
    179     pid_t mNativeMessageThreadId;
    180 
    181     int status = pthread_create(&mMessageThreadId, nullptr, threadProc, this);
    182     if (status) {
    183         ALOGE("Failed to start RS message thread.");
    184         return false;
    185     }
    186     // Wait for the message thread to be active.
    187     while (!mMessageRun) {
    188         usleep(1000);
    189     }
    190 
    191     mInit = true;
    192 
    193     return true;
    194 }
    195 
    196 void RS::throwError(RSError error, const char *errMsg) {
    197     if (mCurrentError == RS_SUCCESS) {
    198         mCurrentError = error;
    199         ALOGE("RS CPP error: %s", errMsg);
    200     } else {
    201         ALOGE("RS CPP error (masked by previous error): %s", errMsg);
    202     }
    203 }
    204 
    205 RSError RS::getError() {
    206     return mCurrentError;
    207 }
    208 
    209 
    210 void * RS::threadProc(void *vrsc) {
    211     RS *rs = static_cast<RS *>(vrsc);
    212     size_t rbuf_size = 256;
    213     void * rbuf = malloc(rbuf_size);
    214 
    215     RS::dispatch->ContextInitToClient(rs->mContext);
    216     rs->mMessageRun = true;
    217 
    218     while (rs->mMessageRun) {
    219         size_t receiveLen = 0;
    220         uint32_t usrID = 0;
    221         uint32_t subID = 0;
    222         RsMessageToClientType r = RS::dispatch->ContextPeekMessage(rs->mContext,
    223                                                                    &receiveLen, sizeof(receiveLen),
    224                                                                    &usrID, sizeof(usrID));
    225 
    226         if (receiveLen >= rbuf_size) {
    227             rbuf_size = receiveLen + 32;
    228             rbuf = realloc(rbuf, rbuf_size);
    229         }
    230         if (!rbuf) {
    231             ALOGE("RS::message handler realloc error %zu", rbuf_size);
    232             // No clean way to recover now?
    233         }
    234         RS::dispatch->ContextGetMessage(rs->mContext, rbuf, rbuf_size, &receiveLen, sizeof(receiveLen),
    235                             &subID, sizeof(subID));
    236 
    237         switch(r) {
    238         case RS_MESSAGE_TO_CLIENT_ERROR:
    239             ALOGE("RS Error %s", (const char *)rbuf);
    240             rs->throwError(RS_ERROR_RUNTIME_ERROR, "Error returned from runtime");
    241             if(rs->mMessageFunc != nullptr) {
    242                 rs->mErrorFunc(usrID, (const char *)rbuf);
    243             }
    244             break;
    245         case RS_MESSAGE_TO_CLIENT_NONE:
    246         case RS_MESSAGE_TO_CLIENT_EXCEPTION:
    247         case RS_MESSAGE_TO_CLIENT_RESIZE:
    248             // teardown. But we want to avoid starving other threads during
    249             // teardown by yielding until the next line in the destructor can
    250             // execute to set mRun = false. Note that the FIFO sends an
    251             // empty NONE message when it reaches its destructor.
    252             usleep(1000);
    253             break;
    254         case RS_MESSAGE_TO_CLIENT_USER:
    255             if(rs->mMessageFunc != nullptr) {
    256                 rs->mMessageFunc(usrID, rbuf, receiveLen);
    257             } else {
    258                 ALOGE("Received a message from the script with no message handler installed.");
    259             }
    260             break;
    261 
    262         default:
    263             ALOGE("RS unknown message type %i", r);
    264         }
    265     }
    266 
    267     if (rbuf) {
    268         free(rbuf);
    269     }
    270     ALOGV("RS Message thread exiting.");
    271     return nullptr;
    272 }
    273 
    274 void RS::setErrorHandler(ErrorHandlerFunc_t func) {
    275     mErrorFunc = func;
    276 }
    277 
    278 void RS::setMessageHandler(MessageHandlerFunc_t func) {
    279     mMessageFunc  = func;
    280 }
    281 
    282 void RS::finish() {
    283     RS::dispatch->ContextFinish(mContext);
    284 }
    285