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, 8 insertions, 1 deletions

diff --git a/examples/example-base/test-base.h b/examples/example-base/test-base.h
index 293c9f0d8..2705baa26 100644
--- a/examples/example-base/test-base.h
+++ b/examples/example-base/test-base.h
@@ -2,6 +2,7 @@
 
 #include "core/slang-string-util.h"
 #include "slang-com-ptr.h"
+#include "slang-rhi.h"
 #include "slang.h"
 
 using Slang::ComPtr;
@@ -10,7 +11,7 @@ class TestBase
 {
 
 public:
-    // Parses command line options. This example only has one option for testing purpose.
+    // Parses command line options including help, API selection, and test mode.
     int parseOption(int argc, char** argv);
 
     void printEntrypointHashes(
@@ -19,8 +20,14 @@ public:
         ComPtr<slang::IComponentType>& composedProgram);
 
     bool isTestMode() const { return m_isTestMode; }
+    bool shouldShowHelp() const { return m_showHelp; }
+    rhi::DeviceType getDeviceType() const { return m_deviceType; }
+
+    void printUsage(const char* programName) const;
 
 private:
     bool m_isTestMode = false;
+    bool m_showHelp = false;
+    rhi::DeviceType m_deviceType = rhi::DeviceType::Default;
     uint64_t m_globalCounter = 0;
 };