Add command-line arguments to examples (#7835)

* Add command-line arguments to triangle example

- Add -h/--help flag to show usage information
- Add -api flag to select rendering API (d3d11 < /dev/null | d3d12|vulkan|metal|cpu|cuda|webgpu)
- Platform-specific API availability (D3D on Windows, Metal on macOS)
- Output works for both console and WIN32 applications

1 files changed, 7 insertions, 0 deletions

diff --git a/examples/example-base/example-base.h b/examples/example-base/example-base.h
index 06970aaba..fbb54748a 100644
--- a/examples/example-base/example-base.h
+++ b/examples/example-base/example-base.h
@@ -136,6 +136,13 @@ int innerMain(int argc, char** argv)
     TApp app;
 
     app.parseOption(argc, argv);
+
+    if (app.shouldShowHelp())
+    {
+        app.printUsage(argc > 0 ? argv[0] : "example");
+        return 0;
+    }
+
     if (SLANG_FAILED(app.initialize()))
     {
         return -1;