synced from DRGTK 1.27

1 files changed, 41 insertions, 0 deletions

diff --git a/samples/07_advanced_rendering/06_pixel_arrays/app/main.rb b/samples/07_advanced_rendering/06_pixel_arrays/app/main.rb
new file mode 100644
index 0000000..12291c4
--- /dev/null
+++ b/samples/07_advanced_rendering/06_pixel_arrays/app/main.rb
@@ -0,0 +1,41 @@
+$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
+