-- where all the low-level details (such as texture formats) are handled by the
-- C++ side and you generally just build chains.
+-- TODO: Deal with inputs that are different from our native 1280x720 resolution.
+
local transition_start = -2.0
local transition_end = -1.0
local zoom_src = 0.0
local zoom_dst = 1.0
local zoom_poi = 0 -- which input to zoom in on
-local fade_src = 0.0
-local fade_dst = 1.0
+local fade_src_signal = 0
+local fade_dst_signal = 0
local input0_neutral_color = {0.5, 0.5, 0.5}
local input1_neutral_color = {0.5, 0.5, 0.5}
local live_signal_num = 0
local preview_signal_num = 1
--- The main live chain.
-function make_sbs_chain(hq)
- local chain = EffectChain.new(16, 9)
- local input0 = chain:add_live_input(true)
- input0:connect_signal(0)
- local input0_wb_effect = chain:add_effect(WhiteBalanceEffect.new())
- local input1 = chain:add_live_input(true)
- input1:connect_signal(1)
- local input1_wb_effect = chain:add_effect(WhiteBalanceEffect.new())
+-- Valid values for live_signal_num and preview_signal_num.
+local INPUT0_SIGNAL_NUM = 0
+local INPUT1_SIGNAL_NUM = 1
+local SBS_SIGNAL_NUM = 2
+local STATIC_SIGNAL_NUM = 3
+
+-- “fake” signal number that signifies that we are fading from one input
+-- to the next.
+local FADE_SIGNAL_NUM = 4
+
+function make_sbs_input(chain, signal, deint, hq)
+ local input = chain:add_live_input(not deint, deint) -- Override bounce only if not deinterlacing.
+ input:connect_signal(signal)
+ local wb_effect = chain:add_effect(WhiteBalanceEffect.new())
local resample_effect = nil
local resize_effect = nil
if (hq) then
- resample_effect = chain:add_effect(ResampleEffect.new(), input0_wb_effect)
+ resample_effect = chain:add_effect(ResampleEffect.new())
else
- resize_effect = chain:add_effect(ResizeEffect.new(), input0_wb_effect)
+ resize_effect = chain:add_effect(ResizeEffect.new())
end
local padding_effect = chain:add_effect(IntegralPaddingEffect.new())
- padding_effect:set_vec4("border_color", 0.0, 0.0, 0.0, 1.0)
- local resample2_effect = nil
- local resize2_effect = nil
- if (hq) then
- resample2_effect = chain:add_effect(ResampleEffect.new(), input1_wb_effect)
+ return {
+ input = input,
+ wb_effect = wb_effect,
+ resample_effect = resample_effect,
+ resize_effect = resize_effect,
+ padding_effect = padding_effect
+ }
+end
+
+-- The main live chain.
+function make_sbs_chain(input0_deint, input1_deint, hq)
+ local chain = EffectChain.new(16, 9)
+
+ local input0 = make_sbs_input(chain, INPUT0_SIGNAL_NUM, input0_deint, hq)
+ local input1 = make_sbs_input(chain, INPUT1_SIGNAL_NUM, input1_deint, hq)
+
+ input0.padding_effect:set_vec4("border_color", 0.0, 0.0, 0.0, 1.0)
+ input1.padding_effect:set_vec4("border_color", 0.0, 0.0, 0.0, 0.0)
+
+ chain:add_effect(OverlayEffect.new(), input0.padding_effect, input1.padding_effect)
+ chain:finalize(hq)
+
+ return {
+ chain = chain,
+ input0 = input0,
+ input1 = input1
+ }
+end
+
+-- Make all possible combinations of side-by-side chains.
+local sbs_chains = {}
+for input0_type, input0_deint in pairs({live = false, livedeint = true}) do
+ sbs_chains[input0_type] = {}
+ for input1_type, input1_deint in pairs({live = false, livedeint = true}) do
+ sbs_chains[input0_type][input1_type] = {}
+ for _, hq in pairs({true, false}) do
+ sbs_chains[input0_type][input1_type][hq] =
+ make_sbs_chain(input0_deint, input1_deint, hq)
+ end
+ end
+end
+
+function make_fade_input(chain, signal, live, deint)
+ local input, wb_effect, last
+ if live then
+ input = chain:add_live_input(false, deint)
+ wb_effect = chain:add_effect(WhiteBalanceEffect.new())
+ input:connect_signal(signal)
+ last = wb_effect
else
- resize2_effect = chain:add_effect(ResizeEffect.new(), input1_wb_effect)
+ input = chain:add_effect(ImageInput.new("bg.jpeg"))
+ last = input
+ end
+
+ return {
+ input = input,
+ wb_effect = wb_effect,
+ last = last
+ }
+end
+
+-- 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, input0_deint, input1_live, input1_deint, hq)
+ local chain = EffectChain.new(16, 9)
+
+ local input0 = make_fade_input(chain, INPUT0_SIGNAL_NUM, input0_live, input0_deint)
+ local input1 = make_fade_input(chain, INPUT1_SIGNAL_NUM, input1_live, input1_deint)
+
+ local mix_effect = chain:add_effect(MixEffect.new(), input0.last, input1.last)
+ chain:finalize(hq)
+
+ return {
+ chain = chain,
+ input0 = input0,
+ input1 = input1,
+ 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, livedeint = true}) do
+ local input0_deint = (input0_live == "livedeint")
+ fade_chains[input0_type] = {}
+ for input1_type, input1_live in pairs({static = false, live = true, livedeint = true}) do
+ local input1_deint = (input1_live == "livedeint")
+ 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, input0_deint, input1_live, input1_deint, hq)
+ end
end
- local padding2_effect = chain:add_effect(IntegralPaddingEffect.new())
+end
- chain:add_effect(OverlayEffect.new(), padding_effect, padding2_effect)
+-- A chain to show a single input on screen.
+function make_simple_chain(input_deint, hq)
+ local chain = EffectChain.new(16, 9)
+
+ local input = chain:add_live_input(false, input_deint)
+ input:connect_signal(0) -- First input card. Can be changed whenever you want.
+ local wb_effect = chain:add_effect(WhiteBalanceEffect.new())
chain:finalize(hq)
return {
chain = chain,
- input0 = {
- input = input0,
- white_balance_effect = input0_wb_effect,
- resample_effect = resample_effect,
- resize_effect = resize_effect,
- padding_effect = padding_effect
- },
- input1 = {
- input = input1,
- white_balance_effect = input1_wb_effect,
- resample_effect = resample2_effect,
- resize_effect = resize2_effect,
- padding_effect = padding2_effect
- }
+ input = input,
+ wb_effect = wb_effect
}
end
-local main_chain_hq = make_sbs_chain(true)
-local main_chain_lq = make_sbs_chain(false)
-
--- A chain to fade between two inputs (live chain only)
-local fade_chain_hq = EffectChain.new(16, 9)
-local fade_chain_hq_input0 = fade_chain_hq:add_live_input(true)
-local fade_chain_hq_wb0_effect = fade_chain_hq:add_effect(WhiteBalanceEffect.new())
-local fade_chain_hq_input1 = fade_chain_hq:add_live_input(true)
-local fade_chain_hq_wb1_effect = fade_chain_hq:add_effect(WhiteBalanceEffect.new())
-fade_chain_hq_input0:connect_signal(0)
-fade_chain_hq_input1:connect_signal(1)
-local fade_chain_mix_effect = fade_chain_hq:add_effect(MixEffect.new(), fade_chain_hq_wb0_effect, fade_chain_hq_wb1_effect)
-fade_chain_hq:finalize(true)
-
--- A chain to show a single input on screen (HQ version).
-local simple_chain_hq = EffectChain.new(16, 9)
-local simple_chain_hq_input = simple_chain_hq:add_live_input(true)
-simple_chain_hq_input:connect_signal(0) -- First input card. Can be changed whenever you want.
-local simple_chain_hq_wb_effect = simple_chain_hq:add_effect(WhiteBalanceEffect.new())
-simple_chain_hq:finalize(true)
-
--- A chain to show a single input on screen (LQ version).
-local simple_chain_lq = EffectChain.new(16, 9)
-local simple_chain_lq_input = simple_chain_lq:add_live_input(true)
-simple_chain_lq_input:connect_signal(0) -- First input card. Can be changed whenever you want.
-local simple_chain_lq_wb_effect = simple_chain_lq:add_effect(WhiteBalanceEffect.new())
-simple_chain_lq:finalize(false)
+-- Make all possible combinations of single-input chains.
+local simple_chains = {}
+for input_type, input_deint in pairs({live = false, livedeint = true}) do
+ simple_chains[input_type] = {}
+ for _, hq in pairs({true, false}) do
+ simple_chains[input_type][hq] = make_simple_chain(input_deint, hq)
+ end
+end
+
+-- A chain to show a single static picture on screen (HQ version).
+local static_chain_hq = EffectChain.new(16, 9)
+local static_chain_hq_input = static_chain_hq:add_effect(ImageInput.new("bg.jpeg"))
+static_chain_hq:finalize(true)
+
+-- A chain to show a single static picture on screen (LQ version).
+local static_chain_lq = EffectChain.new(16, 9)
+local static_chain_lq_input = static_chain_lq:add_effect(ImageInput.new("bg.jpeg"))
+static_chain_lq:finalize(false)
+
+-- Used for indexing into the tables of chains.
+function get_input_type(signals, signal_num)
+ if signal_num == STATIC_SIGNAL_NUM then
+ return "static"
+ elseif signals:get_interlaced(signal_num) then
+ return "livedeint"
+ else
+ return "live"
+ end
+end
-- Returns the number of outputs in addition to the live (0) and preview (1).
-- Called only once, at the start of the program.
function num_channels()
- return 3
+ return 4
end
-- Returns the name for each additional channel (starting from 2).
return "Input 1"
elseif channel == 3 then
return "Input 2"
- else
+ elseif channel == 4 then
return "Side-by-side"
+ elseif channel == 5 then
+ return "Static picture"
end
end
end
function finish_transitions(t)
- -- If live is 2 (SBS) but de-facto single, make it so.
- if live_signal_num == 2 and t >= transition_end and zoom_dst == 1.0 then
+ -- If live is SBS but de-facto single, make it so.
+ if live_signal_num == SBS_SIGNAL_NUM and t >= transition_end and zoom_dst == 1.0 then
live_signal_num = zoom_poi
end
- -- If live is 3 (fade) but de-facto single, make it so.
- if live_signal_num == 3 and t >= transition_end and fade_dst == 1.0 then
- live_signal_num = 0
- end
- if live_signal_num == 3 and t >= transition_end and fade_dst == 0.0 then
- live_signal_num = 1
+ -- If live is fade but de-facto single, make it so.
+ if live_signal_num == FADE_SIGNAL_NUM and t >= transition_end then
+ live_signal_num = fade_dst_signal
end
end
return {}
end
- if live_signal_num == 2 and t >= transition_start and t <= transition_end then
+ if live_signal_num == SBS_SIGNAL_NUM and t >= transition_start and t <= transition_end then
-- Zoom in progress.
return {"Cut"}
end
- if (live_signal_num == 0 and preview_signal_num == 1) or
- (live_signal_num == 1 and preview_signal_num == 0) then
+ if (live_signal_num == INPUT0_SIGNAL_NUM or
+ live_signal_num == INPUT1_SIGNAL_NUM or
+ live_signal_num == STATIC_SIGNAL_NUM) and
+ (preview_signal_num == INPUT0_SIGNAL_NUM or
+ preview_signal_num == INPUT1_SIGNAL_NUM or
+ preview_signal_num == STATIC_SIGNAL_NUM) then
return {"Cut", "", "Fade"}
end
-- Various zooms.
- if live_signal_num == 2 and (preview_signal_num == 0 or preview_signal_num == 1) then
+ if live_signal_num == SBS_SIGNAL_NUM and
+ (preview_signal_num == INPUT0_SIGNAL_NUM or preview_signal_num == INPUT1_SIGNAL_NUM) then
return {"Cut", "Zoom in"}
- elseif (live_signal_num == 0 or live_signal_num == 1) and preview_signal_num == 2 then
+ elseif (live_signal_num == INPUT0_SIGNAL_NUM or live_signal_num == INPUT1_SIGNAL_NUM) and
+ preview_signal_num == SBS_SIGNAL_NUM then
return {"Cut", "Zoom out"}
end
function transition_clicked(num, t)
if num == 0 then
-- Cut.
- if live_signal_num == 3 then
+ if live_signal_num == FADE_SIGNAL_NUM then
-- Ongoing fade; finish it immediately.
finish_transitions(transition_end)
end
live_signal_num = preview_signal_num
preview_signal_num = temp
- if live_signal_num == 2 then
+ if live_signal_num == SBS_SIGNAL_NUM then
-- Just cut to SBS, we need to reset any zooms.
zoom_src = 1.0
zoom_dst = 0.0
return
end
- if (live_signal_num == 0 and preview_signal_num == 1) or
- (live_signal_num == 1 and preview_signal_num == 0) then
+ if (live_signal_num == INPUT0_SIGNAL_NUM and preview_signal_num == INPUT1_SIGNAL_NUM) or
+ (live_signal_num == INPUT1_SIGNAL_NUM and preview_signal_num == INPUT0_SIGNAL_NUM) then
-- We can't zoom between these. Just make a cut.
io.write("Cutting from " .. live_signal_num .. " to " .. live_signal_num .. "\n")
local temp = live_signal_num
return
end
- if live_signal_num == 2 and (preview_signal_num == 0 or preview_signal_num == 1) then
+ if live_signal_num == SBS_SIGNAL_NUM and
+ (preview_signal_num == INPUT0_SIGNAL_NUM or preview_signal_num == INPUT1_SIGNAL_NUM) then
-- Zoom in from SBS to single.
transition_start = t
transition_end = t + 1.0
zoom_src = 0.0
zoom_dst = 1.0
zoom_poi = preview_signal_num
- preview_signal_num = 2
- elseif (live_signal_num == 0 or live_signal_num == 1) and preview_signal_num == 2 then
+ preview_signal_num = SBS_SIGNAL_NUM
+ elseif (live_signal_num == INPUT0_SIGNAL_NUM or live_signal_num == INPUT1_SIGNAL_NUM) and
+ preview_signal_num == SBS_SIGNAL_NUM then
-- Zoom out from single to SBS.
transition_start = t
transition_end = t + 1.0
zoom_dst = 0.0
preview_signal_num = live_signal_num
zoom_poi = live_signal_num
- live_signal_num = 2
+ live_signal_num = SBS_SIGNAL_NUM
end
elseif num == 2 then
finish_transitions(t)
-- Fade.
- if live_signal_num == 0 and preview_signal_num == 1 then
+ if (live_signal_num ~= preview_signal_num) and
+ (live_signal_num == INPUT0_SIGNAL_NUM or
+ live_signal_num == INPUT1_SIGNAL_NUM or
+ live_signal_num == STATIC_SIGNAL_NUM) and
+ (preview_signal_num == INPUT0_SIGNAL_NUM or
+ preview_signal_num == INPUT1_SIGNAL_NUM or
+ preview_signal_num == STATIC_SIGNAL_NUM) then
transition_start = t
transition_end = t + 1.0
- fade_src = 1.0
- fade_dst = 0.0
- preview_signal_num = 0
- live_signal_num = 3
- elseif live_signal_num == 1 and preview_signal_num == 0 then
- transition_start = t
- transition_end = t + 1.0
- fade_src = 0.0
- fade_dst = 1.0
- preview_signal_num = 1
- live_signal_num = 3
+ fade_src_signal = live_signal_num
+ fade_dst_signal = preview_signal_num
+ preview_signal_num = live_signal_num
+ live_signal_num = FADE_SIGNAL_NUM
else
-- Fades involving SBS are ignored (we have no chain for it).
end
-- 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 chain selection.
+--
-- You should return two objects; the chain itself, and then a
-- function (taking no parameters) that is run just before rendering.
-- The function needs to call connect_signal on any inputs, so that
--
-- NOTE: The chain returned must be finalized with the Y'CbCr flag
-- if and only if num==0.
-function get_chain(num, t, width, height)
+function get_chain(num, t, width, height, signals)
if num == 0 then -- Live.
- if live_signal_num == 0 or live_signal_num == 1 then -- Plain inputs.
+ if live_signal_num == INPUT0_SIGNAL_NUM or live_signal_num == INPUT1_SIGNAL_NUM then -- Plain input.
+ local input_type = get_input_type(signals, live_signal_num)
+ local chain = simple_chains[input_type][true]
prepare = function()
- simple_chain_hq_input:connect_signal(live_signal_num)
- if live_signal_num == 0 then
- set_neutral_color(simple_chain_hq_wb_effect, input0_neutral_color)
- else
- set_neutral_color(simple_chain_hq_wb_effect, input1_neutral_color)
- end
+ chain.input:connect_signal(live_signal_num)
+ set_neutral_color_from_signal(chain.wb_effect, live_signal_num)
end
- return simple_chain_hq, prepare
- elseif live_signal_num == 3 then -- Fade.
+ return chain.chain, prepare
+ elseif live_signal_num == STATIC_SIGNAL_NUM then -- Static picture.
prepare = function()
- fade_chain_hq_input0:connect_signal(0)
- set_neutral_color(fade_chain_hq_wb0_effect, input0_neutral_color)
- fade_chain_hq_input1:connect_signal(1)
- set_neutral_color(fade_chain_hq_wb1_effect, input1_neutral_color)
- local tt = (t - transition_start) / (transition_end - transition_start)
- if tt < 0.0 then
- tt = 0.0
- elseif tt > 1.0 then
- tt = 1.0
+ end
+ return static_chain_hq, prepare
+ elseif live_signal_num == FADE_SIGNAL_NUM then -- Fade.
+ local input0_type = get_input_type(signals, fade_src_signal)
+ local input1_type = get_input_type(signals, fade_dst_signal)
+ local chain = fade_chains[input0_type][input1_type][true]
+ prepare = function()
+ if input0_type == "live" then
+ chain.input0.input:connect_signal(fade_src_signal)
+ set_neutral_color_from_signal(chain.input0.wb_effect, fade_src_signal)
end
+ if input1_type == "live" then
+ chain.input1.input:connect_signal(fade_dst_signal)
+ set_neutral_color_from_signal(chain.input1.wb_effect, fade_dst_signal)
+ end
+ local tt = calc_fade_progress(t, transition_start, transition_end)
- tt = fade_src + tt * (fade_dst - fade_src)
-
- -- Make the fade look maybe a tad more natural, by pumping it
- -- through a sigmoid function.
- tt = 10.0 * tt - 5.0
- tt = 1.0 / (1.0 + math.exp(-tt))
-
- fade_chain_mix_effect:set_float("strength_first", tt)
- fade_chain_mix_effect:set_float("strength_second", 1.0 - tt)
+ chain.mix_effect:set_float("strength_first", 1.0 - tt)
+ chain.mix_effect:set_float("strength_second", tt)
end
- return fade_chain_hq, prepare
+ return chain.chain, prepare
end
- -- SBS code (live_signal_num == 2).
+ -- SBS code (live_signal_num == SBS_SIGNAL_NUM).
+ local input0_type = get_input_type(signals, INPUT0_SIGNAL_NUM)
+ local input1_type = get_input_type(signals, INPUT1_SIGNAL_NUM)
if t > transition_end and zoom_dst == 1.0 then
-- Special case: Show only the single image on screen.
+ local chain = simple_chains[input0_type][true]
prepare = function()
- simple_chain_hq_input:connect_signal(0)
- set_neutral_color(simple_chain_hq_wb_effect, input0_neutral_color)
+ chain.input:connect_signal(INPUT0_SIGNAL_NUM)
+ set_neutral_color(chain.wb_effect, input0_neutral_color)
end
- return simple_chain_hq, prepare
+ return chain.chain, prepare
end
+ local chain = sbs_chains[input0_type][input1_type][true]
prepare = function()
if t < transition_start then
- prepare_sbs_chain(main_chain_hq, zoom_src, width, height)
+ prepare_sbs_chain(chain, zoom_src, width, height)
elseif t > transition_end then
- prepare_sbs_chain(main_chain_hq, zoom_dst, width, height)
+ prepare_sbs_chain(chain, zoom_dst, width, height)
else
local tt = (t - transition_start) / (transition_end - transition_start)
-- Smooth it a bit.
tt = math.sin(tt * 3.14159265358 * 0.5)
- prepare_sbs_chain(main_chain_hq, zoom_src + (zoom_dst - zoom_src) * tt, width, height)
+ prepare_sbs_chain(chain, zoom_src + (zoom_dst - zoom_src) * tt, width, height)
end
end
- return main_chain_hq.chain, prepare
+ return chain.chain, prepare
end
if num == 1 then -- Preview.
num = preview_signal_num + 2
end
- if num == 2 then
+
+ -- Individual preview inputs.
+ if num == INPUT0_SIGNAL_NUM + 2 then
+ local input_type = get_input_type(signals, INPUT0_SIGNAL_NUM)
+ local chain = simple_chains[input_type][false]
+ prepare = function()
+ chain.input:connect_signal(INPUT0_SIGNAL_NUM)
+ set_neutral_color(chain.wb_effect, input0_neutral_color)
+ end
+ return chain.chain, prepare
+ end
+ if num == INPUT1_SIGNAL_NUM + 2 then
+ local input_type = get_input_type(signals, INPUT1_SIGNAL_NUM)
+ local chain = simple_chains[input_type][false]
prepare = function()
- simple_chain_lq_input:connect_signal(0)
- set_neutral_color(simple_chain_lq_wb_effect, input0_neutral_color)
+ chain.input:connect_signal(INPUT1_SIGNAL_NUM)
+ set_neutral_color(chain.wb_effect, input1_neutral_color)
end
- return simple_chain_lq, prepare
+ return chain.chain, prepare
end
- if num == 3 then
+ if num == SBS_SIGNAL_NUM + 2 then
+ local input0_type = get_input_type(signals, INPUT0_SIGNAL_NUM)
+ local input1_type = get_input_type(signals, INPUT1_SIGNAL_NUM)
+ local chain = sbs_chains[input0_type][input1_type][false]
prepare = function()
- simple_chain_lq_input:connect_signal(1)
- set_neutral_color(simple_chain_lq_wb_effect, input1_neutral_color)
+ prepare_sbs_chain(chain, 0.0, width, height)
end
- return simple_chain_lq, prepare
+ return chain.chain, prepare
end
- if num == 4 then
+ if num == STATIC_SIGNAL_NUM + 2 then
prepare = function()
- prepare_sbs_chain(main_chain_lq, 0.0, width, height)
end
- return main_chain_lq.chain, prepare
+ return static_chain_lq, prepare
end
end
function prepare_sbs_chain(chain, t, screen_width, screen_height)
chain.input0.input:connect_signal(0)
chain.input1.input:connect_signal(1)
- set_neutral_color(chain.input0.white_balance_effect, input0_neutral_color)
- set_neutral_color(chain.input1.white_balance_effect, input1_neutral_color)
+ set_neutral_color(chain.input0.wb_effect, input0_neutral_color)
+ set_neutral_color(chain.input1.wb_effect, input1_neutral_color)
-- First input is positioned (16,48) from top-left.
local width0 = round(848 * screen_width/1280.0)
-- Interpolate between the fullscreen and side-by-side views.
local scale0, tx0, tx0
- if zoom_poi == 0 then
+ if zoom_poi == INPUT0_SIGNAL_NUM then
local new_left0 = lerp(left0, 0, t)
local new_right0 = lerp(right0, screen_width, t)
local new_top0 = lerp(top0, 0, t)
function set_neutral_color(effect, color)
effect:set_vec3("neutral_color", color[1], color[2], color[3])
end
+
+function set_neutral_color_from_signal(effect, signal)
+ if signal == INPUT0_SIGNAL_NUM then
+ set_neutral_color(effect, input0_neutral_color)
+ else
+ set_neutral_color(effect, input1_neutral_color)
+ end
+end
+
+function calc_fade_progress(t, transition_start, transition_end)
+ local tt = (t - transition_start) / (transition_end - transition_start)
+ if tt < 0.0 then
+ tt = 0.0
+ elseif tt > 1.0 then
+ tt = 1.0
+ end
+
+ -- Make the fade look maybe a tad more natural, by pumping it
+ -- through a sigmoid function.
+ tt = 10.0 * tt - 5.0
+ tt = 1.0 / (1.0 + math.exp(-tt))
+
+ return tt
+end
projects / nageru / blobdiff