Offscreen rendering #51
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Introduces a headless rendering mode that allows rendering a single frame and saving it as a PNG image using a new ImageSaver utility. Adds an --output flag to the viewer app for specifying the output image path, updates configuration and window creation to support invisible windows for headless mode, and integrates stb_image_write for PNG export. Also updates CMake to fetch stb and include its headers.
Defines VK_DRIVER_ID_MESA_AGXV and VK_BUFFER_USAGE_2_EXECUTION_GRAPH_SCRATCH_BIT_AMDX if they are not already defined. This ensures compatibility with code referencing these enums even if the Vulkan headers are outdated.
Introduces CameraConfig for loading and saving camera parameters from file. Adds command-line option to specify a camera config file, updates Renderer to load camera settings from file if provided, and documents example camera config formats. This enables reproducible and scriptable camera setups for rendering.
sometimes buffer allocation failed in subsequent calls when it fails fail gracefully
return value was discarded but this was not allowed
handleInput is not needed in headless mode
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Allows rendering to file when specified in cli argument like --output rendered_image.png --width 1920 --height 1080
#49