local wb_effect = scene:add_effect(WhiteBalanceEffect.new())
scene:finalize()
--- Set some global state.
-Nageru.set_num_channels(2) -- Can only be called at the start of the program.
+-- Set some global state. Unless marked otherwise, these can only be set once,
+-- at the start of the program.
+Nageru.set_num_channels(2)
+
+-- Sets, for each channel, which signal it corresponds to (starting from 0).
+-- The information is used for whether right-click on the channel should bring up
+-- an input selector or not. Only call this for channels that actually correspond
+-- directly to a signal (ie., live inputs, not live (0) or preview (1)).
+Nageru.set_channel_signal(2, 0)
+Nageru.set_channel_signal(3, 1)
+
+-- Set whether a given channel supports setting white balance. (Default is false.)
+Nageru.set_supports_wb(2, true)
+Nageru.set_supports_wb(3, true)
+
+-- These can be set at any time.
Nageru.set_channel_name(2, "First input")
Nageru.set_channel_name(3, "Second input")
--- API ENTRY POINT
--- Returns, given a channel number, which signal it corresponds to (starting from 0).
--- Should return -1 if the channel does not correspond to a simple signal.
--- (The information is used for whether right-click on the channel should bring up
--- an input selector or not.)
--- Called once for each channel, at the start of the program.
--- Will never be called for live (0) or preview (1).
-function channel_signal(channel)
- if channel == 2 then
- return 0
- elseif channel == 3 then
- return 1
- else
- return -1
- end
-end
-
-- API ENTRY POINT
-- Called every frame. Returns the color (if any) to paint around the given
-- channel. Returns a CSS color (typically to mark live and preview signals);
return "transparent"
end
--- API ENTRY POINT
--- Returns if a given channel supports setting white balance (starting from 2).
--- Called only once for each channel, at the start of the program.
-function supports_set_wb(channel)
- return channel == 2 or channel == 3
-end
-
-- API ENTRY POINT
-- Gets called with a new gray point when the white balance is changing.
-- The color is in linear light (not sRGB gamma).
-- the output, although you can ignore them if you don't need them
-- (they're useful if you want to e.g. know what to resample by).
--
--- <signals> is basically an exposed InputState, which you can use to
--- query for information about the signals at the point of the current
--- frame. In particular, you can call get_width() and get_height()
--- for any signal number, and use that to e.g. assist in scene selection.
+-- <signals> is an object which you can query for information
+-- about the signals at the point of the current frame. In particular,
+-- you can call get_frame_width() and get_frame_height() for any
+-- signal number, and use that to e.g. see if you wish to enable
+-- a scaler or not. (You can also use get_width() and get_height(),
+-- which return the _field_ size. This has half the height for
+-- interlaced signals.)
--
-- You should return the scene to use, after having set any parameters you
-- want to set (through set_int() etc.). The parameters will be snapshot