1 files changed, 47 insertions, 0 deletions
diff --git a/samples/07_advanced_rendering/11_render_target_noclear/app/main.rb b/samples/07_advanced_rendering/11_render_target_noclear/app/main.rb
new file mode 100644
index 0000000..9e5dffd
--- /dev/null
+++ b/samples/07_advanced_rendering/11_render_target_noclear/app/main.rb
@@ -0,0 +1,47 @@
+def tick args
+  args.state.x ||= 500
+  args.state.y ||= 350
+  args.state.xinc ||= 7
+  args.state.yinc ||= 7
+  args.state.bgcolor ||= 1
+  args.state.bginc ||= 1
+
+  # clear the render target on the first tick, and then never again. Draw
+  #  another box to it every tick, accumulating over time.
+  clear_target = (args.state.tick_count == 0) || (args.inputs.keyboard.key_down.space)
+  args.render_target(:accumulation).background_color = [ 0, 0, 0, 0 ];
+  args.render_target(:accumulation).clear_before_render = clear_target
+  args.render_target(:accumulation).solids << [args.state.x, args.state.y, 25, 25, 255, 0, 0, 255];
+  args.state.x += args.state.xinc
+  args.state.y += args.state.yinc
+  args.state.bgcolor += args.state.bginc
+
+  # animation upkeep...change where we draw the next box and what color the
+  #  window background will be.
+  if args.state.xinc > 0 && args.state.x >= 1280
+    args.state.xinc = -7
+  elsif args.state.xinc < 0 && args.state.x < 0
+    args.state.xinc = 7
+  end
+
+  if args.state.yinc > 0 && args.state.y >= 720
+    args.state.yinc = -7
+  elsif args.state.yinc < 0 && args.state.y < 0
+    args.state.yinc = 7
+  end
+
+  if args.state.bginc > 0 && args.state.bgcolor >= 255
+    args.state.bginc = -1
+  elsif args.state.bginc < 0 && args.state.bgcolor <= 0
+    args.state.bginc = 1
+  end
+
+  # clear the screen to a shade of blue and draw the render target, which
+  #  is not clearing every frame, on top of it. Note that you can NOT opt to
+  #  skip clearing the screen, only render targets. The screen clears every
+  #  frame; double-buffering would prevent correct updates between frames.
+  args.outputs.background_color = [ 0, 0, args.state.bgcolor, 255 ]
+  args.outputs.sprites << [ 0, 0, 1280, 720, :accumulation ]
+end
+
+$gtk.reset