Command line arguments --text, --json and --html output to file is inconsistant

[christophe-lunarg]

vulkaninfo has a [-o , --output ] argument, which is great. I would expect that when this argument is used, the log is outputted into a file, otherwise it's outputted to stdout.

text mode
However, outputting to stdout is only happening when vulkaninfo is called using:
vulkaninfo or
vulkaninfo --text

If using vulkaninfo --text -o I got the help to be displayed which match the --help but I think the filename could be optional.

json mode
When using:
vulkaninfo --json
The vulkaninfo log is automatically written into a filename that express what GPU it matched, eg: VP_VULKANINFO_NVIDIA_GeForce_RTX_3080_Ti_553_22_0_0.json.

However, I think vulkaninfo --json should output to stdout instead to match the --text behavior and -o should be used to output to a generated name file.

html mode
When using:
vulkaninfo --html
The vulkaninfo log is automatically written into vulkaninfo.html

However, I think vulkaninfo --html should output to stdout instead to match the --text behavior and -o should be used to output to a generated name file.

[charles-lunarg]

The issue with the above request is that --json only outputs info about a single GPU while --text and --html output info about all devices. IE, the options are fundamentally inconsistent with what they contain. --text and --html would need to be able to output info about a single GPU and for that matter it would make sense to allow --json to print information on the entire system.

[christophe-lunarg]

Another thing, if you don't want to break compatibility with the current behavior, I think it's fine to add an option to explicitly output to console.