Home | History | Annotate | Download | only in cpp 
      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(__ANDROID__)
     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     mContext = nullptr;
     46     mErrorFunc = nullptr;
     47     mMessageFunc = nullptr;
     48     mMessageRun = false;
     49     mInit = false;
     50     mCurrentError = RS_SUCCESS;
     51 
     52     memset(&mElements, 0, sizeof(mElements));
     53     memset(&mSamplers, 0, sizeof(mSamplers));
     54 }
     55 
     56 RS::~RS() {
     57     if (mInit == true) {
     58         mMessageRun = false;
     59 
     60         if (mContext) {
     61             finish();
     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     }
     71 }
     72 
     73 bool RS::init(const char * name, uint32_t flags) {
     74     return RS::init(name, flags, 0);
     75 }
     76 
     77 // This will only open API 19+ libRS, because that's when
     78 // we changed libRS to extern "C" entry points.
     79 static bool loadSO(const char* filename, int targetApi) {
     80     void* handle = dlopen(filename, RTLD_LAZY | RTLD_LOCAL);
     81     if (handle == nullptr) {
     82         ALOGV("couldn't dlopen %s, %s", filename, dlerror());
     83         return false;
     84     }
     85 
     86     if (loadSymbols(handle, *RS::dispatch, targetApi) == false) {
     87         ALOGV("%s init failed!", filename);
     88         return false;
     89     }
     90     return true;
     91 }
     92 
     93 static uint32_t getProp(const char *str) {
     94 #if !defined(__LP64__) && !defined(RS_SERVER) && defined(__ANDROID__)
     95     char buf[256];
     96     property_get(str, buf, "0");
     97     return atoi(buf);
     98 #else
     99     return 0;
    100 #endif
    101 }
    102 
    103 bool RS::initDispatch(int targetApi) {
    104     pthread_mutex_lock(&gInitMutex);
    105     if (gInitError) {
    106         goto error;
    107     } else if (gInitialized) {
    108         pthread_mutex_unlock(&gInitMutex);
    109         return true;
    110     }
    111 
    112     RS::dispatch = new dispatchTable;
    113 
    114     // Attempt to load libRS, load libRSSupport on failure.
    115     // If property is set, proceed directly to libRSSupport.
    116     if (getProp("debug.rs.forcecompat") == 0) {
    117         usingNative = loadSO("libRS.so", targetApi);
    118     }
    119     if (usingNative == false) {
    120         if (loadSO("libRSSupport.so", targetApi) == false) {
    121             ALOGE("Failed to load libRS.so and libRSSupport.so");
    122             goto error;
    123         }
    124     }
    125 
    126     gInitialized = true;
    127 
    128     pthread_mutex_unlock(&gInitMutex);
    129     return true;
    130 
    131  error:
    132     gInitError = 1;
    133     pthread_mutex_unlock(&gInitMutex);
    134     return false;
    135 }
    136 
    137 bool RS::init(const char * name, uint32_t flags, int targetApi) {
    138     if (mInit) {
    139         return true;
    140     }
    141     // When using default value 0, set targetApi to RS_VERSION,
    142     // to preserve the behavior of existing apps.
    143     if (targetApi == 0) {
    144         targetApi = RS_VERSION;
    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     // Add the null character even if the user does not.
    159     mCacheDir[nameLen] = 0;
    160     mCacheDirLen = nameLen + 1;
    161 
    162     RsDevice device = RS::dispatch->DeviceCreate();
    163     if (device == 0) {
    164         ALOGE("Device creation failed");
    165         return false;
    166     }
    167 
    168     if (flags & ~(RS_CONTEXT_SYNCHRONOUS | RS_CONTEXT_LOW_LATENCY |
    169                   RS_CONTEXT_LOW_POWER | RS_CONTEXT_WAIT_FOR_ATTACH)) {
    170         ALOGE("Invalid flags passed");
    171         return false;
    172     }
    173 
    174     mContext = RS::dispatch->ContextCreate(device, 0, targetApi, RS_CONTEXT_TYPE_NORMAL, flags);
    175     if (mContext == 0) {
    176         ALOGE("Context creation failed");
    177         return false;
    178     }
    179 
    180     pid_t mNativeMessageThreadId;
    181 
    182     int status = pthread_create(&mMessageThreadId, nullptr, threadProc, this);
    183     if (status) {
    184         ALOGE("Failed to start RS message thread.");
    185         return false;
    186     }
    187     // Wait for the message thread to be active.
    188     while (!mMessageRun) {
    189         usleep(1000);
    190     }
    191 
    192     mInit = true;
    193 
    194     return true;
    195 }
    196 
    197 void RS::throwError(RSError error, const char *errMsg) {
    198     if (mCurrentError == RS_SUCCESS) {
    199         mCurrentError = error;
    200         ALOGE("RS CPP error: %s", errMsg);
    201     } else {
    202         ALOGE("RS CPP error (masked by previous error): %s", errMsg);
    203     }
    204 }
    205 
    206 RSError RS::getError() {
    207     return mCurrentError;
    208 }
    209 
    210 
    211 void * RS::threadProc(void *vrsc) {
    212     RS *rs = static_cast<RS *>(vrsc);
    213     size_t rbuf_size = 256;
    214     void * rbuf = malloc(rbuf_size);
    215 
    216     RS::dispatch->ContextInitToClient(rs->mContext);
    217     rs->mMessageRun = true;
    218 
    219     while (rs->mMessageRun) {
    220         size_t receiveLen = 0;
    221         uint32_t usrID = 0;
    222         uint32_t subID = 0;
    223         RsMessageToClientType r = RS::dispatch->ContextPeekMessage(rs->mContext,
    224                                                                    &receiveLen, sizeof(receiveLen),
    225                                                                    &usrID, sizeof(usrID));
    226 
    227         if (receiveLen >= rbuf_size) {
    228             rbuf_size = receiveLen + 32;
    229             rbuf = realloc(rbuf, rbuf_size);
    230         }
    231         if (!rbuf) {
    232             ALOGE("RS::message handler realloc error %zu", rbuf_size);
    233             // No clean way to recover now?
    234         }
    235         RS::dispatch->ContextGetMessage(rs->mContext, rbuf, rbuf_size, &receiveLen, sizeof(receiveLen),
    236                             &subID, sizeof(subID));
    237 
    238         switch(r) {
    239         case RS_MESSAGE_TO_CLIENT_ERROR:
    240             ALOGE("RS Error %s", (const char *)rbuf);
    241             rs->throwError(RS_ERROR_RUNTIME_ERROR, "Error returned from runtime");
    242             if(rs->mMessageFunc != nullptr) {
    243                 rs->mErrorFunc(usrID, (const char *)rbuf);
    244             }
    245             break;
    246         case RS_MESSAGE_TO_CLIENT_NONE:
    247         case RS_MESSAGE_TO_CLIENT_EXCEPTION:
    248         case RS_MESSAGE_TO_CLIENT_RESIZE:
    249             /*
    250              * Teardown. We want to avoid starving other threads during
    251              * teardown by yielding until the next line in the destructor can
    252              * execute to set mRun = false. Note that the FIFO sends an
    253              * empty NONE message when it reaches its destructor.
    254              */
    255             usleep(1000);
    256             break;
    257         case RS_MESSAGE_TO_CLIENT_USER:
    258             if(rs->mMessageFunc != nullptr) {
    259                 rs->mMessageFunc(usrID, rbuf, receiveLen);
    260             } else {
    261                 ALOGE("Received a message from the script with no message handler installed.");
    262             }
    263             break;
    264 
    265         default:
    266             ALOGE("RS unknown message type %i", r);
    267         }
    268     }
    269 
    270     if (rbuf) {
    271         free(rbuf);
    272     }
    273     ALOGV("RS Message thread exiting.");
    274     return nullptr;
    275 }
    276 
    277 void RS::setErrorHandler(ErrorHandlerFunc_t func) {
    278     mErrorFunc = func;
    279 }
    280 
    281 void RS::setMessageHandler(MessageHandlerFunc_t func) {
    282     mMessageFunc  = func;
    283 }
    284 
    285 void RS::finish() {
    286     RS::dispatch->ContextFinish(mContext);
    287 }
    288