--- A chain to fade between two inputs (live chain only)
-local fade_vtv_chain_hq = EffectChain.new(16, 9)
-local fade_vtv_chain_hq_input0 = fade_vtv_chain_hq:add_live_input(true)
-local fade_vtv_chain_hq_wb0_effect = fade_vtv_chain_hq:add_effect(WhiteBalanceEffect.new())
-local fade_vtv_chain_hq_input1 = fade_vtv_chain_hq:add_live_input(true)
-local fade_vtv_chain_hq_wb1_effect = fade_vtv_chain_hq:add_effect(WhiteBalanceEffect.new())
-fade_vtv_chain_hq_input0:connect_signal(0)
-fade_vtv_chain_hq_input1:connect_signal(1)
-local fade_vtv_chain_mix_effect = fade_vtv_chain_hq:add_effect(MixEffect.new(), fade_vtv_chain_hq_wb0_effect, fade_vtv_chain_hq_wb1_effect)
-fade_vtv_chain_hq:finalize(true)
-
--- A chain to fade between an inputs and a picture (live chain only)
-local fade_vtp_chain_hq = EffectChain.new(16, 9)
-local fade_vtp_chain_hq_input0 = fade_vtp_chain_hq:add_live_input(true)
-local fade_vtp_chain_hq_wb0_effect = fade_vtp_chain_hq:add_effect(WhiteBalanceEffect.new())
-local fade_vtp_chain_hq_input1 = fade_vtp_chain_hq:add_effect(ImageInput.new("bg.jpeg"))
-fade_vtp_chain_hq_input0:connect_signal(0)
-local fade_vtp_chain_mix_effect = fade_vtp_chain_hq:add_effect(MixEffect.new(), fade_vtp_chain_hq_wb0_effect, fade_vtp_chain_hq_input1)
-fade_vtp_chain_hq:finalize(true)
+-- A chain to fade between two inputs, of which either can be a picture
+-- or a live input. In practice only used live, but we still support the
+-- hq parameter.
+function make_fade_chain(input0_live, input1_live, hq)
+ local chain = EffectChain.new(16, 9)
+
+ local input0, wb0_effect, input0_last, input1, wb1_effect, input1_last
+
+ if input0_live then
+ input0 = chain:add_live_input(true)
+ wb0_effect = chain:add_effect(WhiteBalanceEffect.new())
+ input0:connect_signal(0)
+ input0_last = wb0_effect
+ else
+ input0 = chain:add_effect(ImageInput.new("bg.jpeg"))
+ input0_last = input0
+ end
+
+ if input1_live then
+ input1 = chain:add_live_input(true)
+ wb1_effect = chain:add_effect(WhiteBalanceEffect.new())
+ input1:connect_signal(1)
+ input1_last = wb1_effect
+ else
+ input1 = chain:add_effect(ImageInput.new("bg.jpeg"))
+ input1_last = input1
+ end
+
+ local mix_effect = chain:add_effect(MixEffect.new(), input0_last, input1_last)
+ chain:finalize(hq)
+
+ return {
+ chain = chain,
+ input0 = {
+ input = input0,
+ white_balance_effect = wb0_effect
+ },
+ input1 = {
+ input = input1,
+ white_balance_effect = wb1_effect
+ },
+ mix_effect = mix_effect
+ }
+end
+
+-- Chains to fade between two inputs, in various configurations.
+local fade_chains = {}
+for input0_type, input0_live in pairs({static = false, live = true}) do
+ fade_chains[input0_type] = {}
+ for input1_type, input1_live in pairs({static = false, live = true}) do
+ fade_chains[input0_type][input1_type] = {}
+ for _, hq in pairs({true, false}) do
+ fade_chains[input0_type][input1_type][hq] = make_fade_chain(input0_live, input1_live, hq)
+ end
+ end
+end