1 -- The theme is what decides what's actually shown on screen, what kind of
2 -- transitions are available (if any), and what kind of inputs there are,
3 -- if any. In general, it drives the entire display logic by creating Movit
4 -- chains, setting their parameters and then deciding which to show when.
6 -- Themes are written in Lua, which reflects a simplified form of the Movit API
7 -- where all the low-level details (such as texture formats) are handled by the
8 -- C++ side and you generally just build chains.
10 local transition_start = -2.0
11 local transition_end = -1.0
14 local zoom_poi = 0 -- which input to zoom in on
15 local fade_src_signal = 0
16 local fade_dst_signal = 0
18 local input0_neutral_color = {0.5, 0.5, 0.5}
19 local input1_neutral_color = {0.5, 0.5, 0.5}
21 local live_signal_num = 0
22 local preview_signal_num = 1
24 -- Valid values for live_signal_num and preview_signal_num.
25 local INPUT0_SIGNAL_NUM = 0
26 local INPUT1_SIGNAL_NUM = 1
27 local SBS_SIGNAL_NUM = 2
28 local STATIC_SIGNAL_NUM = 3
30 -- “fake” signal number that signifies that we are fading from one input
32 local FADE_SIGNAL_NUM = 4
34 -- Last width/height/resolution for each channel, if we have it.
35 local last_resolution = {}
37 -- Utility function to help creating many similar chains that can differ
38 -- in a free set of chosen parameters.
39 function make_cartesian_product(parms, callback)
40 return make_cartesian_product_internal(parms, callback, 1, {})
43 function make_cartesian_product_internal(parms, callback, index, args)
44 if index > #parms then
45 return callback(unpack(args))
48 for _, value in ipairs(parms[index]) do
50 ret[value] = make_cartesian_product_internal(parms, callback, index + 1, args)
55 function make_sbs_input(chain, signal, deint, hq)
56 local input = chain:add_live_input(not deint, deint) -- Override bounce only if not deinterlacing.
57 input:connect_signal(signal)
58 local wb_effect = chain:add_effect(WhiteBalanceEffect.new())
60 local resample_effect = nil
61 local resize_effect = nil
63 resample_effect = chain:add_effect(ResampleEffect.new())
65 resize_effect = chain:add_effect(ResizeEffect.new())
68 local padding_effect = chain:add_effect(IntegralPaddingEffect.new())
72 wb_effect = wb_effect,
73 resample_effect = resample_effect,
74 resize_effect = resize_effect,
75 padding_effect = padding_effect
79 -- The main live chain.
80 function make_sbs_chain(input0_deint, input1_deint, hq)
81 local chain = EffectChain.new(16, 9)
83 local input0 = make_sbs_input(chain, INPUT0_SIGNAL_NUM, input0_deint, hq)
84 local input1 = make_sbs_input(chain, INPUT1_SIGNAL_NUM, input1_deint, hq)
86 input0.padding_effect:set_vec4("border_color", 0.0, 0.0, 0.0, 1.0)
87 input1.padding_effect:set_vec4("border_color", 0.0, 0.0, 0.0, 0.0)
89 chain:add_effect(OverlayEffect.new(), input0.padding_effect, input1.padding_effect)
99 -- Make all possible combinations of side-by-side chains.
100 local sbs_chains = make_cartesian_product({
101 {"live", "livedeint"}, -- input0_type
102 {"live", "livedeint"}, -- input1_type
104 }, function(input0_type, input1_type, hq)
105 local input0_deint = (input0_type == "livedeint")
106 local input1_deint = (input1_type == "livedeint")
107 return make_sbs_chain(input0_deint, input1_deint, hq)
110 function make_fade_input(chain, signal, live, deint, scale)
111 local input, wb_effect, resample_effect, last
113 input = chain:add_live_input(false, deint)
114 wb_effect = chain:add_effect(WhiteBalanceEffect.new())
115 input:connect_signal(signal)
118 input = chain:add_effect(ImageInput.new("bg.jpeg"))
122 -- If we cared about this for the non-main inputs, we would have
123 -- checked hq here and invoked ResizeEffect instead.
125 resample_effect = chain:add_effect(ResampleEffect.new())
126 last = resample_effect
131 wb_effect = wb_effect,
132 resample_effect = resample_effect,
137 -- A chain to fade between two inputs, of which either can be a picture
138 -- or a live input. In practice only used live, but we still support the
140 function make_fade_chain(input0_live, input0_deint, input0_scale, input1_live, input1_deint, input1_scale, hq)
141 local chain = EffectChain.new(16, 9)
143 local input0 = make_fade_input(chain, INPUT0_SIGNAL_NUM, input0_live, input0_deint, input0_scale)
144 local input1 = make_fade_input(chain, INPUT1_SIGNAL_NUM, input1_live, input1_deint, input1_scale)
146 local mix_effect = chain:add_effect(MixEffect.new(), input0.last, input1.last)
153 mix_effect = mix_effect
157 -- Chains to fade between two inputs, in various configurations.
158 local fade_chains = make_cartesian_product({
159 {"static", "live", "livedeint"}, -- input0_type
160 {true, false}, -- input0_scale
161 {"static", "live", "livedeint"}, -- input1_type
162 {true, false}, -- input1_scale
164 }, function(input0_type, input0_scale, input1_type, input1_scale, hq)
165 local input0_live = (input0_type ~= "static")
166 local input1_live = (input1_type ~= "static")
167 local input0_deint = (input0_type == "livedeint")
168 local input1_deint = (input1_type == "livedeint")
169 return make_fade_chain(input0_live, input0_deint, input0_scale, input1_live, input1_deint, input1_scale, hq)
172 -- A chain to show a single input on screen.
173 function make_simple_chain(input_deint, input_scale, hq)
174 local chain = EffectChain.new(16, 9)
176 local input = chain:add_live_input(false, input_deint)
177 input:connect_signal(0) -- First input card. Can be changed whenever you want.
178 local wb_effect = chain:add_effect(WhiteBalanceEffect.new())
181 local resample_effect, resize_effect
184 resample_effect = chain:add_effect(ResampleEffect.new())
186 resize_effect = chain:add_effect(ResizeEffect.new())
193 wb_effect = wb_effect,
194 resample_effect = resample_effect,
195 resize_effect = resize_effect
199 -- Make all possible combinations of single-input chains.
200 local simple_chains = make_cartesian_product({
201 {"live", "livedeint"}, -- input_type
202 {true, false}, -- input_scale
204 }, function(input_type, input_scale, hq)
205 local input_deint = (input_type == "livedeint")
206 return make_simple_chain(input_deint, input_scale, hq)
209 -- A chain to show a single static picture on screen (HQ version).
210 local static_chain_hq = EffectChain.new(16, 9)
211 local static_chain_hq_input = static_chain_hq:add_effect(ImageInput.new("bg.jpeg"))
212 static_chain_hq:finalize(true)
214 -- A chain to show a single static picture on screen (LQ version).
215 local static_chain_lq = EffectChain.new(16, 9)
216 local static_chain_lq_input = static_chain_lq:add_effect(ImageInput.new("bg.jpeg"))
217 static_chain_lq:finalize(false)
219 -- Used for indexing into the tables of chains.
220 function get_input_type(signals, signal_num)
221 if signal_num == STATIC_SIGNAL_NUM then
223 elseif signals:get_interlaced(signal_num) then
230 function needs_scale(signals, signal_num, width, height)
231 return (signals:get_width(signal_num) ~= width or signals:get_height(signal_num) ~= height)
234 function set_scale_parameters_if_needed(chain_or_input, width, height)
235 if chain_or_input.resample_effect then
236 chain_or_input.resample_effect:set_int("width", width)
237 chain_or_input.resample_effect:set_int("height", height)
238 elseif chain_or_input.resize_effect then
239 chain_or_input.resize_effect:set_int("width", width)
240 chain_or_input.resize_effect:set_int("height", height)
244 -- Returns the number of outputs in addition to the live (0) and preview (1).
245 -- Called only once, at the start of the program.
246 function num_channels()
250 -- Helper function to write e.g. “60” or “59.94”.
251 function get_frame_rate(signal_num)
252 local nom = last_resolution[signal_num].frame_rate_nom
253 local den = last_resolution[signal_num].frame_rate_den
254 if last_resolution[signal_num].interlaced then
257 if nom % den == 0 then
260 return string.format("%.2f", num / den)
264 -- Helper function to write e.g. “720p60”.
265 function get_channel_resolution(signal_num)
266 if last_resolution[signal_num] then
267 if last_resolution[signal_num].height == 0 or
268 last_resolution[signal_num].height == 525 then
270 elseif last_resolution[signal_num].interlaced then
271 return (last_resolution[signal_num].height * 2) .. "i" .. get_frame_rate(signal_num)
273 return last_resolution[signal_num].height .. "p" .. get_frame_rate(signal_num)
280 -- Returns the name for each additional channel (starting from 2).
281 -- Called at the start of the program, and then each frame for live
282 -- channels in case they change resolution.
283 function channel_name(channel)
285 return "Input 1 (" .. get_channel_resolution(0) .. ")"
286 elseif channel == 3 then
287 return "Input 2 (" .. get_channel_resolution(1) .. ")"
288 elseif channel == 4 then
289 return "Side-by-side"
290 elseif channel == 5 then
291 return "Static picture"
295 -- Returns if a given channel supports setting white balance (starting from 2).
296 -- Called only once for each channel, at the start of the program.
297 function supports_set_wb(channel)
298 return channel == 2 or channel == 3
301 -- Gets called with a new gray point when the white balance is changing.
302 -- The color is in linear light (not sRGB gamma).
303 function set_wb(channel, red, green, blue)
305 input0_neutral_color = { red, green, blue }
306 elseif channel == 3 then
307 input1_neutral_color = { red, green, blue }
311 function finish_transitions(t)
312 -- If live is SBS but de-facto single, make it so.
313 if live_signal_num == SBS_SIGNAL_NUM and t >= transition_end and zoom_dst == 1.0 then
314 live_signal_num = zoom_poi
317 -- If live is fade but de-facto single, make it so.
318 if live_signal_num == FADE_SIGNAL_NUM and t >= transition_end then
319 live_signal_num = fade_dst_signal
323 -- Called every frame.
324 function get_transitions(t)
325 finish_transitions(t)
327 if live_signal_num == preview_signal_num then
331 if live_signal_num == SBS_SIGNAL_NUM and t >= transition_start and t <= transition_end then
336 if (live_signal_num == INPUT0_SIGNAL_NUM or
337 live_signal_num == INPUT1_SIGNAL_NUM or
338 live_signal_num == STATIC_SIGNAL_NUM) and
339 (preview_signal_num == INPUT0_SIGNAL_NUM or
340 preview_signal_num == INPUT1_SIGNAL_NUM or
341 preview_signal_num == STATIC_SIGNAL_NUM) then
342 return {"Cut", "", "Fade"}
346 if live_signal_num == SBS_SIGNAL_NUM and
347 (preview_signal_num == INPUT0_SIGNAL_NUM or preview_signal_num == INPUT1_SIGNAL_NUM) then
348 return {"Cut", "Zoom in"}
349 elseif (live_signal_num == INPUT0_SIGNAL_NUM or live_signal_num == INPUT1_SIGNAL_NUM) and
350 preview_signal_num == SBS_SIGNAL_NUM then
351 return {"Cut", "Zoom out"}
357 function transition_clicked(num, t)
360 if live_signal_num == FADE_SIGNAL_NUM then
361 -- Ongoing fade; finish it immediately.
362 finish_transitions(transition_end)
365 local temp = live_signal_num
366 live_signal_num = preview_signal_num
367 preview_signal_num = temp
369 if live_signal_num == SBS_SIGNAL_NUM then
370 -- Just cut to SBS, we need to reset any zooms.
373 transition_start = -2.0
374 transition_end = -1.0
379 finish_transitions(t)
381 if live_signal_num == preview_signal_num then
386 if (live_signal_num == INPUT0_SIGNAL_NUM and preview_signal_num == INPUT1_SIGNAL_NUM) or
387 (live_signal_num == INPUT1_SIGNAL_NUM and preview_signal_num == INPUT0_SIGNAL_NUM) then
388 -- We can't zoom between these. Just make a cut.
389 io.write("Cutting from " .. live_signal_num .. " to " .. live_signal_num .. "\n")
390 local temp = live_signal_num
391 live_signal_num = preview_signal_num
392 preview_signal_num = temp
396 if live_signal_num == SBS_SIGNAL_NUM and
397 (preview_signal_num == INPUT0_SIGNAL_NUM or preview_signal_num == INPUT1_SIGNAL_NUM) then
398 -- Zoom in from SBS to single.
400 transition_end = t + 1.0
403 zoom_poi = preview_signal_num
404 preview_signal_num = SBS_SIGNAL_NUM
405 elseif (live_signal_num == INPUT0_SIGNAL_NUM or live_signal_num == INPUT1_SIGNAL_NUM) and
406 preview_signal_num == SBS_SIGNAL_NUM then
407 -- Zoom out from single to SBS.
409 transition_end = t + 1.0
412 preview_signal_num = live_signal_num
413 zoom_poi = live_signal_num
414 live_signal_num = SBS_SIGNAL_NUM
417 finish_transitions(t)
420 if (live_signal_num ~= preview_signal_num) and
421 (live_signal_num == INPUT0_SIGNAL_NUM or
422 live_signal_num == INPUT1_SIGNAL_NUM or
423 live_signal_num == STATIC_SIGNAL_NUM) and
424 (preview_signal_num == INPUT0_SIGNAL_NUM or
425 preview_signal_num == INPUT1_SIGNAL_NUM or
426 preview_signal_num == STATIC_SIGNAL_NUM) then
428 transition_end = t + 1.0
429 fade_src_signal = live_signal_num
430 fade_dst_signal = preview_signal_num
431 preview_signal_num = live_signal_num
432 live_signal_num = FADE_SIGNAL_NUM
434 -- Fades involving SBS are ignored (we have no chain for it).
439 function channel_clicked(num)
440 preview_signal_num = num
443 -- Called every frame. Get the chain for displaying at input <num>,
444 -- where 0 is live, 1 is preview, 2 is the first channel to display
445 -- in the bottom bar, and so on up to num_channels()+1. t is the
446 -- current time in seconds. width and height are the dimensions of
447 -- the output, although you can ignore them if you don't need them
448 -- (they're useful if you want to e.g. know what to resample by).
450 -- <signals> is basically an exposed InputState, which you can use to
451 -- query for information about the signals at the point of the current
452 -- frame. In particular, you can call get_width() and get_height()
453 -- for any signal number, and use that to e.g. assist in chain selection.
455 -- You should return two objects; the chain itself, and then a
456 -- function (taking no parameters) that is run just before rendering.
457 -- The function needs to call connect_signal on any inputs, so that
458 -- it gets updated video data for the given frame. (You are allowed
459 -- to switch which input your input is getting from between frames,
460 -- but not calling connect_signal results in undefined behavior.)
461 -- If you want to change any parameters in the chain, this is also
464 -- NOTE: The chain returned must be finalized with the Y'CbCr flag
465 -- if and only if num==0.
466 function get_chain(num, t, width, height, signals)
467 local input_resolution = {}
468 for signal_num=0,1 do
469 input_resolution[signal_num] = {
470 width = signals:get_width(signal_num),
471 height = signals:get_height(signal_num),
472 interlaced = signals:get_interlaced(signal_num),
473 frame_rate_nom = signals:get_frame_rate_nom(signal_num),
474 frame_rate_den = signals:get_frame_rate_den(signal_num)
477 last_resolution = input_resolution
479 if num == 0 then -- Live.
480 if live_signal_num == INPUT0_SIGNAL_NUM or live_signal_num == INPUT1_SIGNAL_NUM then -- Plain input.
481 local input_type = get_input_type(signals, live_signal_num)
482 local input_scale = needs_scale(signals, live_signal_num, width, height)
483 local chain = simple_chains[input_type][input_scale][true]
485 chain.input:connect_signal(live_signal_num)
486 set_scale_parameters_if_needed(chain, width, height)
487 set_neutral_color_from_signal(chain.wb_effect, live_signal_num)
489 return chain.chain, prepare
490 elseif live_signal_num == STATIC_SIGNAL_NUM then -- Static picture.
493 return static_chain_hq, prepare
494 elseif live_signal_num == FADE_SIGNAL_NUM then -- Fade.
495 local input0_type = get_input_type(signals, fade_src_signal)
496 local input0_scale = needs_scale(signals, fade_src_signal, width, height)
497 local input1_type = get_input_type(signals, fade_dst_signal)
498 local input1_scale = needs_scale(signals, fade_dst_signal, width, height)
499 local chain = fade_chains[input0_type][input0_scale][input1_type][input1_scale][true]
501 if input0_type == "live" then
502 chain.input0.input:connect_signal(fade_src_signal)
503 set_neutral_color_from_signal(chain.input0.wb_effect, fade_src_signal)
505 set_scale_parameters_if_needed(chain.input0, width, height)
506 if input1_type == "live" then
507 chain.input1.input:connect_signal(fade_dst_signal)
508 set_neutral_color_from_signal(chain.input1.wb_effect, fade_dst_signal)
510 set_scale_parameters_if_needed(chain.input1, width, height)
511 local tt = calc_fade_progress(t, transition_start, transition_end)
513 chain.mix_effect:set_float("strength_first", 1.0 - tt)
514 chain.mix_effect:set_float("strength_second", tt)
516 return chain.chain, prepare
519 -- SBS code (live_signal_num == SBS_SIGNAL_NUM).
520 local input0_type = get_input_type(signals, INPUT0_SIGNAL_NUM)
521 local input1_type = get_input_type(signals, INPUT1_SIGNAL_NUM)
522 if t > transition_end and zoom_dst == 1.0 then
523 -- Special case: Show only the single image on screen.
524 local input0_scale = needs_scale(signals, fade_src_signal, width, height)
525 local chain = simple_chains[input0_type][input0_scale][true]
527 chain.input:connect_signal(INPUT0_SIGNAL_NUM)
528 set_scale_parameters_if_needed(chain, width, height)
529 set_neutral_color(chain.wb_effect, input0_neutral_color)
531 return chain.chain, prepare
533 local chain = sbs_chains[input0_type][input1_type][true]
535 if t < transition_start then
536 prepare_sbs_chain(chain, zoom_src, width, height, input_resolution)
537 elseif t > transition_end then
538 prepare_sbs_chain(chain, zoom_dst, width, height, input_resolution)
540 local tt = (t - transition_start) / (transition_end - transition_start)
542 tt = math.sin(tt * 3.14159265358 * 0.5)
543 prepare_sbs_chain(chain, zoom_src + (zoom_dst - zoom_src) * tt, width, height, input_resolution)
546 return chain.chain, prepare
548 if num == 1 then -- Preview.
549 num = preview_signal_num + 2
552 -- Individual preview inputs.
553 if num == INPUT0_SIGNAL_NUM + 2 then
554 local input_type = get_input_type(signals, INPUT0_SIGNAL_NUM)
555 local input_scale = needs_scale(signals, INPUT0_SIGNAL_NUM, width, height)
556 local chain = simple_chains[input_type][input_scale][false]
558 chain.input:connect_signal(INPUT0_SIGNAL_NUM)
559 set_scale_parameters_if_needed(chain, width, height)
560 set_neutral_color(chain.wb_effect, input0_neutral_color)
562 return chain.chain, prepare
564 if num == INPUT1_SIGNAL_NUM + 2 then
565 local input_type = get_input_type(signals, INPUT1_SIGNAL_NUM)
566 local input_scale = needs_scale(signals, INPUT1_SIGNAL_NUM, width, height)
567 local chain = simple_chains[input_type][input_scale][false]
569 chain.input:connect_signal(INPUT1_SIGNAL_NUM)
570 set_scale_parameters_if_needed(chain, width, height)
571 set_neutral_color(chain.wb_effect, input1_neutral_color)
573 return chain.chain, prepare
575 if num == SBS_SIGNAL_NUM + 2 then
576 local input0_type = get_input_type(signals, INPUT0_SIGNAL_NUM)
577 local input1_type = get_input_type(signals, INPUT1_SIGNAL_NUM)
578 local chain = sbs_chains[input0_type][input1_type][false]
580 prepare_sbs_chain(chain, 0.0, width, height, input_resolution)
582 return chain.chain, prepare
584 if num == STATIC_SIGNAL_NUM + 2 then
587 return static_chain_lq, prepare
591 function place_rectangle(resample_effect, resize_effect, padding_effect, x0, y0, x1, y1, screen_width, screen_height, input_width, input_height)
598 if x0 > screen_width or x1 < 0.0 or y0 > screen_height or y1 < 0.0 then
599 resample_effect:set_int("width", 1)
600 resample_effect:set_int("height", 1)
601 resample_effect:set_float("zoom_x", screen_width)
602 resample_effect:set_float("zoom_y", screen_height)
603 padding_effect:set_int("left", screen_width + 100)
604 padding_effect:set_int("top", screen_height + 100)
610 srcx0 = -x0 / (x1 - x0)
614 srcy0 = -y0 / (y1 - y0)
617 if x1 > screen_width then
618 srcx1 = (screen_width - x0) / (x1 - x0)
621 if y1 > screen_height then
622 srcy1 = (screen_height - y0) / (y1 - y0)
626 if resample_effect ~= nil then
627 -- High-quality resampling.
628 local x_subpixel_offset = x0 - math.floor(x0)
629 local y_subpixel_offset = y0 - math.floor(y0)
631 -- Resampling must be to an integral number of pixels. Round up,
632 -- and then add an extra pixel so we have some leeway for the border.
633 local width = math.ceil(x1 - x0) + 1
634 local height = math.ceil(y1 - y0) + 1
635 resample_effect:set_int("width", width)
636 resample_effect:set_int("height", height)
638 -- Correct the discrepancy with zoom. (This will leave a small
639 -- excess edge of pixels and subpixels, which we'll correct for soon.)
640 local zoom_x = (x1 - x0) / (width * (srcx1 - srcx0))
641 local zoom_y = (y1 - y0) / (height * (srcy1 - srcy0))
642 resample_effect:set_float("zoom_x", zoom_x)
643 resample_effect:set_float("zoom_y", zoom_y)
644 resample_effect:set_float("zoom_center_x", 0.0)
645 resample_effect:set_float("zoom_center_y", 0.0)
647 -- Padding must also be to a whole-pixel offset.
648 padding_effect:set_int("left", math.floor(x0))
649 padding_effect:set_int("top", math.floor(y0))
651 -- Correct _that_ discrepancy by subpixel offset in the resampling.
652 resample_effect:set_float("left", srcx0 * input_width - x_subpixel_offset / zoom_x)
653 resample_effect:set_float("top", srcy0 * input_height - y_subpixel_offset / zoom_y)
655 -- Finally, adjust the border so it is exactly where we want it.
656 padding_effect:set_float("border_offset_left", x_subpixel_offset)
657 padding_effect:set_float("border_offset_right", x1 - (math.floor(x0) + width))
658 padding_effect:set_float("border_offset_top", y_subpixel_offset)
659 padding_effect:set_float("border_offset_bottom", y1 - (math.floor(y0) + height))
661 -- Lower-quality simple resizing.
662 local width = round(x1 - x0)
663 local height = round(y1 - y0)
664 resize_effect:set_int("width", width)
665 resize_effect:set_int("height", height)
667 -- Padding must also be to a whole-pixel offset.
668 padding_effect:set_int("left", math.floor(x0))
669 padding_effect:set_int("top", math.floor(y0))
673 -- This is broken, of course (even for positive numbers), but Lua doesn't give us access to real rounding.
675 return math.floor(x + 0.5)
678 function lerp(a, b, t)
679 return a + (b - a) * t
682 function prepare_sbs_chain(chain, t, screen_width, screen_height, input_resolution)
683 chain.input0.input:connect_signal(0)
684 chain.input1.input:connect_signal(1)
685 set_neutral_color(chain.input0.wb_effect, input0_neutral_color)
686 set_neutral_color(chain.input1.wb_effect, input1_neutral_color)
688 -- First input is positioned (16,48) from top-left.
689 local width0 = round(848 * screen_width/1280.0)
690 local height0 = round(width0 * 9.0 / 16.0)
692 local top0 = 48 * screen_height/720.0
693 local left0 = 16 * screen_width/1280.0
694 local bottom0 = top0 + height0
695 local right0 = left0 + width0
697 -- Second input is positioned (16,48) from the bottom-right.
698 local width1 = round(384 * screen_width/1280.0)
699 local height1 = round(216 * screen_height/720.0)
701 local bottom1 = screen_height - 48 * screen_height/720.0
702 local right1 = screen_width - 16 * screen_width/1280.0
703 local top1 = bottom1 - height1
704 local left1 = right1 - width1
706 -- Interpolate between the fullscreen and side-by-side views.
707 local scale0, tx0, tx0
708 if zoom_poi == INPUT0_SIGNAL_NUM then
709 local new_left0 = lerp(left0, 0, t)
710 local new_right0 = lerp(right0, screen_width, t)
711 local new_top0 = lerp(top0, 0, t)
712 local new_bottom0 = lerp(bottom0, screen_height, t)
714 scale0 = (new_right0 - new_left0) / width0 -- Same vertically and horizonally.
715 tx0 = new_left0 - left0 * scale0
716 ty0 = new_top0 - top0 * scale0
718 local new_left1 = lerp(left1, 0, t)
719 local new_right1 = lerp(right1, screen_width, t)
720 local new_top1 = lerp(top1, 0, t)
721 local new_bottom1 = lerp(bottom1, screen_height, t)
723 scale0 = (new_right1 - new_left1) / width1 -- Same vertically and horizonally.
724 tx0 = new_left1 - left1 * scale0
725 ty0 = new_top1 - top1 * scale0
728 top0 = top0 * scale0 + ty0
729 bottom0 = bottom0 * scale0 + ty0
730 left0 = left0 * scale0 + tx0
731 right0 = right0 * scale0 + tx0
733 top1 = top1 * scale0 + ty0
734 bottom1 = bottom1 * scale0 + ty0
735 left1 = left1 * scale0 + tx0
736 right1 = right1 * scale0 + tx0
737 place_rectangle(chain.input0.resample_effect, chain.input0.resize_effect, chain.input0.padding_effect, left0, top0, right0, bottom0, screen_width, screen_height, input_resolution[0].width, input_resolution[0].height)
738 place_rectangle(chain.input1.resample_effect, chain.input1.resize_effect, chain.input1.padding_effect, left1, top1, right1, bottom1, screen_width, screen_height, input_resolution[1].width, input_resolution[1].height)
741 function set_neutral_color(effect, color)
742 effect:set_vec3("neutral_color", color[1], color[2], color[3])
745 function set_neutral_color_from_signal(effect, signal)
746 if signal == INPUT0_SIGNAL_NUM then
747 set_neutral_color(effect, input0_neutral_color)
749 set_neutral_color(effect, input1_neutral_color)
753 function calc_fade_progress(t, transition_start, transition_end)
754 local tt = (t - transition_start) / (transition_end - transition_start)
761 -- Make the fade look maybe a tad more natural, by pumping it
762 -- through a sigmoid function.
764 tt = 1.0 / (1.0 + math.exp(-tt))