X-Git-Url: https://git.sesse.net/?p=nageru;a=blobdiff_plain;f=simple.lua;h=2bff8f341a09387f643d92bc397b14b1d92ea501;hp=1e895d5cb69f7a236b6932b5846b7f95e721104d;hb=703e00da89118df9be0354dda621bed023e6030e;hpb=fc92430551c5a5f7787db62bc42d5192610859b4

diff --git a/simple.lua b/simple.lua
index 1e895d5..2bff8f3 100644
--- a/simple.lua
+++ b/simple.lua
@@ -77,6 +77,15 @@ function channel_signal(channel)
 	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);
+-- "transparent" is allowed.
+-- Will never be called for live (0) or preview (1).
+function channel_color(channel)
+	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.
@@ -157,9 +166,13 @@ function get_chain(num, t, width, height, signals)
 		signal_num = num - 2
 	end
 
-	prepare = function()
+	-- Make a copy of the current neutral color before returning, so that the
+	-- returned prepare function is unaffected by state changes made by the UI
+	-- before it is rendered.
+	local color = input_neutral_color[signal_num + 1]
+
+	local prepare = function()
 		chain.input:connect_signal(signal_num)
-		local color = input_neutral_color[signal_num + 1]
 		chain.wb_effect:set_vec3("neutral_color", color[1], color[2], color[3])
 	end
 	return chain.chain, prepare