This repo contains the source for a Vulkan applicaiton that renders a triangle in one subpass, and in the next, darkens it. The application then saves the output as a PNG.
setup_board --board=${BOARD}).emerge vulkan-loader media-libs/mesa libpng && cros deploy ${IP_ADDR} ${PACKAGES}).make shaderstarget={local, atlas (i915), cheza (adreno)} make