[ion] Add blackbox compare

ion/src/blackbox/compare.cpp

@@ -0,0 +1,51 @@
+// Compare_main
+
+// make -j8 PLATFORM=blackbox libepsilon_first.dylib
+// make -j8 PLATFORM=blackbox libepsilon_second.dylib
+//
+
+#undef EPSILON_LIB_PREFIX
+#define EPSILON_LIB_PREFIX first
+#include "library.h"
+#undef EPSILON_LIB_PREFIX
+#define EPSILON_LIB_PREFIX second
+#include "library.h"
+
+#include <ion.h>
+#include <thread>
+
+int main(int argc, char * argv[]) {
+
+  std::thread first(first_epsilon_main);
+  std::thread second(second_epsilon_main);
+
+  const KDColor * firstFrameBuffer = first_epsilon_frame_buffer();
+  const KDColor * secondFrameBuffer = second_epsilon_frame_buffer();
+  int index = 0;
+  while (true) {
+    int e = getchar();
+    index++;
+
+    first_epsilon_send_event(e);
+    second_epsilon_send_event(e);
+
+    if (e == EOF) {
+      break;
+    }
+
+    first_epsilon_wait_event_processed();
+    second_epsilon_wait_event_processed();
+
+    if (memcmp(firstFrameBuffer, secondFrameBuffer, sizeof(KDColor) * Ion::Display::Width * Ion::Display::Height) != 0) {
+      printf("Framebuffer mismatch at index %d\n", index);
+      first_epsilon_write_frame_buffer_to_file("epsilon_first.png");
+      second_epsilon_write_frame_buffer_to_file("epsilon_second.png");
+      exit(-1);
+    } else {
+      //printf("Framebuffer at %p and %p were the same\n", firstFrameBuffer, secondFrameBuffer);
+    }
+  }
+
+  first.join();
+  second.join();
+}