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tree: c1c940dc81642f9a782f1a3d33f5b7988ad7f635 [path history] [tgz]
  1. meta/
  2. src/
  3. BUILD.gn
  4. README.md
src/ui/examples/flatland-rainbow/README.md

flatland-rainbow example app

There are two components defined here (plus tests):

  • flatland-rainbow.cm
  • flatland-rainbow-vulkan.cm

flatland-rainbow.cm is a simple example app which uses Flatland to display content. It displays colored squares which rotate colors through time. It also listens to touch events and echoes them to the syslog.

flatland-rainbow-vulkan.cm is the same, except it uses Vulkan to render, instead of negotiating CPU-writable buffers with sysmem. Also, this component connects directly to the fuchsia.element.GraphicalPresenter protocol, rather than serving the fuchsia.ui.app.ViewProvider protocol and waiting for a request.

The same binary is used by the two components; the difference is that the latter passes --use-vulkan and --use-graphical-presenter to the program.

TODO(https://fxbug.dev/42055867): the Vulkan version uses a single filled rect, instead of rendering each quadrant in a different color.

To launch:

  • ffx session add fuchsia-pkg://fuchsia.com/flatland-examples#meta/flatland-rainbow.cm
  • ffx session add fuchsia-pkg://fuchsia.com/flatland-examples#meta/flatland-rainbow-vulkan.cm