add hdr display support

src/main.cpp

@@ -61,6 +61,7 @@ static void PrintUsage() {
 	::printf(
 	    "  --gpu <index>                        Vulkan physical device index. Default: auto.\n");
 	::printf("  --fullscreen                         Run in borderless desktop fullscreen.\n");
+	::printf("  --hdr                                Enable HDR10 output when supported.\n");
 	::printf(
 	    "  --hide-cursor                        Hide the cursor after 2 s idle. Default: off.\n");
 	::printf("  --no-splash                          Disable the startup splash screen.\n");
@@ -215,6 +216,11 @@ static bool ParseArgs(int argc, char* argv[], RunOptions& options, bool& show_he
 			continue;
 		}
 
+		if (arg == "--hdr") {
+			options.config.hdr_enabled = true;
+			continue;
+		}
+
 		if (arg == "--hide-cursor") {
 			options.config.hide_cursor_enabled = true;
 			continue;