Demos update

-added functionality to detect host CPU threads count
-fixed some memory leaks
-now textures free memory corectly
-added support for up to 32 threads

demos/external/sources/mmutils/thread_pool.d

@@ -810,6 +810,46 @@ private:
 	JobData[4] resumeJobs; /// Dummu jobs to resume some thread
 
 public:
+
+	static int getCPUCoresCount()
+	{
+		version(Windows)
+		{
+			import core.sys.windows.winbase : SYSTEM_INFO, GetSystemInfo;
+			SYSTEM_INFO sysinfo;
+			GetSystemInfo(&sysinfo);
+			return sysinfo.dwNumberOfProcessors;
+		}
+		else version (linux)
+		{
+			version(D_BetterC)
+			{
+				import core.sys.posix.unistd : _SC_NPROCESSORS_ONLN, sysconf;
+				return cast(int)sysconf(_SC_NPROCESSORS_ONLN);
+			}
+			else
+			{
+				import core.sys.linux.sched : CPU_COUNT, cpu_set_t, sched_getaffinity;
+				import core.sys.posix.unistd : _SC_NPROCESSORS_ONLN, sysconf;
+
+				cpu_set_t set = void;
+				if (sched_getaffinity(0, cpu_set_t.sizeof, &set) == 0)
+				{
+					int count = CPU_COUNT(&set);
+					if (count > 0)
+						return cast(uint) count;
+				}
+				return cast(int)sysconf(_SC_NPROCESSORS_ONLN);
+			}
+		}
+		else version(Posix)
+		{
+			import core.sys.posix.unistd;
+    		return cast(int)sysconf(_SC_NPROCESSORS_ONLN);
+		}
+		else return -1;
+	}
+
 	int jobsDoneCount()
 	{
 		int sum;