Android & Projucer: Use more reliable cpu-features package to get CPU SystemStats on Android

examples/Demo/Source/Demos/SystemInfoDemo.cpp

@@ -140,6 +140,7 @@ static String getAllSystemInfo()
       << "CPU has 3DNOW:   " << (SystemStats::has3DNow()  ? "yes" : "no") << newLine
       << "CPU has AVX:     " << (SystemStats::hasAVX()    ? "yes" : "no") << newLine
       << "CPU has AVX2:    " << (SystemStats::hasAVX2()   ? "yes" : "no") << newLine
+      << "CPU has Neon:    " << (SystemStats::hasNeon()   ? "yes" : "no") << newLine
       << newLine;
 
     systemInfo

extras/Projucer/Source/Project Saving/jucer_ProjectExport_Android.h

@@ -349,13 +349,23 @@ private:
         if (! isLibrary())
             mo << "SET(BINARY_NAME \"juce_jni\")" << newLine << newLine;
 
+        mo << "add_library(\"cpufeatures\" STATIC \"${ANDROID_NDK}/sources/android/cpufeatures/cpu-features.c\")" << newLine << newLine;
+
         {
             StringArray projectDefines (getEscapedPreprocessorDefs (getProjectPreprocessorDefs()));
             if (projectDefines.size() > 0)
                 mo << "add_definitions(" << projectDefines.joinIntoString (" ") << ")" << newLine << newLine;
         }
 
-        writeCmakePathLines (mo, "", "include_directories( AFTER", extraSearchPaths);
+        {
+            mo << "include_directories( AFTER" << newLine;
+
+            for (auto& path : extraSearchPaths)
+                mo << "    \"" << escapeDirectoryForCmake (path) << "\"" << newLine;
+
+            mo << "    \"${ANDROID_NDK}/sources/android/cpufeatures\"" << newLine;
+            mo << ")" << newLine << newLine;
+        }
 
         const String& cfgExtraLinkerFlags = getExtraLinkerFlagsString();
         if (cfgExtraLinkerFlags.isNotEmpty())
@@ -460,6 +470,8 @@ private:
 
             for (auto& lib : libraries)
                 mo << "    ${" << lib.toLowerCase().replaceCharacter (L' ', L'_') << "}" << newLine;
+
+            mo << "    \"cpufeatures\"" << newLine;
         }
         mo << ")" << newLine;
 

modules/juce_core/native/juce_BasicNativeHeaders.h

@@ -253,6 +253,10 @@
  #include <fnmatch.h>
  #include <sys/wait.h>
  #include <android/api-level.h>
+
+ // If you are getting include errors here, then you to re-build the Projucer
+ // and re-save your .jucer file.
+ #include <cpu-features.h>
 #endif
 
 // Need to clear various moronic redefinitions made by system headers..

modules/juce_core/native/juce_android_SystemStats.cpp

@@ -343,7 +343,36 @@ String SystemStats::getDisplayLanguage() { return getUserLanguage() + "-" + getU
 //==============================================================================
 void CPUInformation::initialise() noexcept
 {
-    numPhysicalCPUs = numLogicalCPUs = jmax ((int) 1, (int) sysconf (_SC_NPROCESSORS_ONLN));
+    numPhysicalCPUs = numLogicalCPUs = jmax ((int) 1, (int) android_getCpuCount());
+
+    auto cpuFamily   = android_getCpuFamily();
+    auto cpuFeatures = android_getCpuFeatures();
+
+    if (cpuFamily == ANDROID_CPU_FAMILY_X86 || cpuFamily == ANDROID_CPU_FAMILY_X86_64)
+    {
+        hasMMX = hasSSE = hasSSE2 = (cpuFamily == ANDROID_CPU_FAMILY_X86_64);
+
+        hasSSSE3 = ((cpuFeatures & ANDROID_CPU_X86_FEATURE_SSSE3)  != 0);
+        hasSSE41 = ((cpuFeatures & ANDROID_CPU_X86_FEATURE_SSE4_1) != 0);
+        hasSSE42 = ((cpuFeatures & ANDROID_CPU_X86_FEATURE_SSE4_2) != 0);
+        hasAVX   = ((cpuFeatures & ANDROID_CPU_X86_FEATURE_AVX)    != 0);
+        hasAVX2  = ((cpuFeatures & ANDROID_CPU_X86_FEATURE_AVX2)   != 0);
+
+        // Google does not distinguish between MMX, SSE, SSE2, SSE3 and SSSE3. So
+        // I assume (and quick Google searches seem to confirm this) that there are
+        // only devices out there that either support all of this or none of this.
+        if (hasSSSE3)
+            hasMMX = hasSSE = hasSSE2 = hasSSE3 = true;
+    }
+    else if (cpuFamily == ANDROID_CPU_FAMILY_ARM)
+    {
+        hasNeon = ((cpuFeatures & ANDROID_CPU_ARM_FEATURE_NEON) != 0);
+    }
+    else if (cpuFamily == ANDROID_CPU_FAMILY_ARM64)
+    {
+        // all arm 64-bit cpus have neon
+        hasNeon = true;
+    }
 }
 
 //==============================================================================

modules/juce_core/system/juce_SystemStats.cpp

@@ -91,7 +91,7 @@ struct CPUInformation
 
     bool hasMMX = false, hasSSE = false, hasSSE2 = false, hasSSE3 = false,
          has3DNow = false, hasSSSE3 = false, hasSSE41 = false,
-         hasSSE42 = false, hasAVX = false, hasAVX2 = false;
+         hasSSE42 = false, hasAVX = false, hasAVX2 = false, hasNeon = false;
 };
 
 static const CPUInformation& getCPUInformation() noexcept
@@ -112,6 +112,7 @@ bool SystemStats::hasSSE41() noexcept           { return getCPUInformation().has
 bool SystemStats::hasSSE42() noexcept           { return getCPUInformation().hasSSE42; }
 bool SystemStats::hasAVX() noexcept             { return getCPUInformation().hasAVX; }
 bool SystemStats::hasAVX2() noexcept            { return getCPUInformation().hasAVX2; }
+bool SystemStats::hasNeon() noexcept            { return getCPUInformation().hasNeon; }
 
 
 //==============================================================================

modules/juce_core/system/juce_SystemStats.h

@@ -171,6 +171,7 @@ public:
     static bool hasSSE42() noexcept;  /**< Returns true if Intel SSE4.2 instructions are available. */
     static bool hasAVX() noexcept;    /**< Returns true if Intel AVX instructions are available. */
     static bool hasAVX2() noexcept;   /**< Returns true if Intel AVX2 instructions are available. */
+    static bool hasNeon() noexcept;   /**< Returns true if ARM NEON instructions are available. */
 
     //==============================================================================
     /** Finds out how much RAM is in the machine.