Mac support to get executable path from .app file

renderdoc/os/posix/apple/apple_helpers.mm

@@ -22,6 +22,8 @@
  * THE SOFTWARE.
  ******************************************************************************/
 
+#include "api/replay/rdcstr.h"
+
 #import <Cocoa/Cocoa.h>
 
 #define MAX_COUNT_KEYS (65536)
@@ -56,3 +58,13 @@ bool apple_IsKeyPressed(int appleKeyCode)
 {
   return s_keysPressed[appleKeyCode];
 }
+
+rdcstr apple_GetExecutablePathFromAppBundle(const char *appBundlePath)
+{
+  NSString *path = [NSString stringWithCString:appBundlePath encoding:NSUTF8StringEncoding];
+  NSBundle *nsBundle = [NSBundle bundleWithPath:path];
+  NSString *executablePath = nsBundle.executablePath;
+
+  rdcstr result([executablePath cStringUsingEncoding:NSUTF8StringEncoding]);
+  return result;
+}

renderdoc/os/posix/posix_process.cpp

@@ -41,6 +41,9 @@
 #include "os/os_specific.h"
 #include "strings/string_utils.h"
 
+// defined in apple_helpers.mm
+extern rdcstr apple_GetExecutablePathFromAppBundle(const char *appBundlePath);
+
 // defined in foo/foo_process.cpp
 char **GetCurrentEnvironment();
 int GetIdentPort(pid_t childPid);
@@ -536,8 +539,7 @@ static pid_t RunProcess(rdcstr appName, rdcstr workDir, const rdcstr &cmdLine, c
 #if ENABLED(RDOC_APPLE)
   if(appName.size() > 5 && appName.endsWith(".app"))
   {
-    rdcstr realAppName = appName + "/Contents/MacOS/" + get_basename(appName);
-    realAppName.erase(realAppName.size() - 4, ~0U);
+    rdcstr realAppName = apple_GetExecutablePathFromAppBundle(appName.c_str());
 
     if(FileIO::exists(realAppName))
     {