Add prop to force cap compute threading.

bug=6124869

Change-Id: Ibf2cc388f3906cea2741382ff5e522e3b416393c

Author: Jason Sams

libs/rs/driver/rsdCore.cpp

@@ -228,7 +228,12 @@ bool rsdHalInit(Context *rsc, uint32_t version_major, uint32_t version_minor) {
 
     int cpu = sysconf(_SC_NPROCESSORS_ONLN);
     ALOGV("%p Launching thread(s), CPUs %i", rsc, cpu);
-    if (cpu < 2) cpu = 0;
+    if(rsc->props.mDebugMaxThreads && (cpu > (int)rsc->props.mDebugMaxThreads)) {
+        cpu = rsc->props.mDebugMaxThreads;
+    }
+    if (cpu < 2) {
+        cpu = 0;
+    }
 
     dc->mWorkers.mCount = (uint32_t)cpu;
     dc->mWorkers.mThreadId = (pthread_t *) calloc(dc->mWorkers.mCount, sizeof(pthread_t));

libs/rs/rsContext.cpp

@@ -178,10 +178,10 @@ void Context::setupProgramStore() {
     mFragmentStore->setup(this, &mStateFragmentStore);
 }
 
-static bool getProp(const char *str) {
+static uint32_t getProp(const char *str) {
     char buf[PROPERTY_VALUE_MAX];
     property_get(str, buf, "0");
-    return 0 != strcmp(buf, "0");
+    return atoi(buf);
 }
 
 void Context::displayDebugStats() {
@@ -211,13 +211,14 @@ void * Context::threadProc(void *vrsc) {
     setpriority(PRIO_PROCESS, rsc->mNativeThreadId, ANDROID_PRIORITY_DISPLAY);
     rsc->mThreadPriority = ANDROID_PRIORITY_DISPLAY;
 #endif //ANDROID_RS_SERIALIZE
-    rsc->props.mLogTimes = getProp("debug.rs.profile");
-    rsc->props.mLogScripts = getProp("debug.rs.script");
-    rsc->props.mLogObjects = getProp("debug.rs.object");
-    rsc->props.mLogShaders = getProp("debug.rs.shader");
-    rsc->props.mLogShadersAttr = getProp("debug.rs.shader.attributes");
-    rsc->props.mLogShadersUniforms = getProp("debug.rs.shader.uniforms");
-    rsc->props.mLogVisual = getProp("debug.rs.visual");
+    rsc->props.mLogTimes = getProp("debug.rs.profile") != 0;
+    rsc->props.mLogScripts = getProp("debug.rs.script") != 0;
+    rsc->props.mLogObjects = getProp("debug.rs.object") != 0;
+    rsc->props.mLogShaders = getProp("debug.rs.shader") != 0;
+    rsc->props.mLogShadersAttr = getProp("debug.rs.shader.attributes") != 0;
+    rsc->props.mLogShadersUniforms = getProp("debug.rs.shader.uniforms") != 0;
+    rsc->props.mLogVisual = getProp("debug.rs.visual") != 0;
+    rsc->props.mDebugMaxThreads = getProp("debug.rs.max-threads");
 
     if (!rsdHalInit(rsc, 0, 0)) {
         rsc->setError(RS_ERROR_FATAL_DRIVER, "Failed initializing GL");

libs/rs/rsContext.h

@@ -184,6 +184,7 @@ class Context {
         bool mLogShadersAttr;
         bool mLogShadersUniforms;
         bool mLogVisual;
+        uint32_t mDebugMaxThreads;
     } props;
 
     mutable struct {