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$gtk.reset
def tick args
args.state.posinc ||= 1
args.state.pos ||= 0
args.state.rotation ||= 0
dimension = 10 # keep it small and let the GPU scale it when rendering the sprite.
# Set up our "scanner" pixel array and fill it with black pixels.
args.pixel_array(:scanner).width = dimension
args.pixel_array(:scanner).height = dimension
args.pixel_array(:scanner).pixels.fill(0xFF000000, 0, dimension * dimension) # black, full alpha
# Draw a green line that bounces up and down the sprite.
args.pixel_array(:scanner).pixels.fill(0xFF00FF00, dimension * args.state.pos, dimension) # green, full alpha
# Adjust position for next frame.
args.state.pos += args.state.posinc
if args.state.posinc > 0 && args.state.pos >= dimension
args.state.posinc = -1
args.state.pos = dimension - 1
elsif args.state.posinc < 0 && args.state.pos < 0
args.state.posinc = 1
args.state.pos = 1
end
# New/changed pixel arrays get uploaded to the GPU before we render
# anything. At that point, they can be scaled, rotated, and otherwise
# used like any other sprite.
w = 100
h = 100
x = (1280 - w) / 2
y = (720 - h) / 2
args.outputs.background_color = [64, 0, 128]
args.outputs.primitives << [x, y, w, h, :scanner, args.state.rotation].sprite
args.state.rotation += 1
args.outputs.primitives << args.gtk.current_framerate_primitives
end
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