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 -- Note that unlike the values we get from Nageru, the resolution is per
36 -- frame and not per field, since we deinterlace.
37 local last_resolution = {}
39 -- Utility function to help creating many similar chains that can differ
40 -- in a free set of chosen parameters.
41 function make_cartesian_product(parms, callback)
42 return make_cartesian_product_internal(parms, callback, 1, {})
45 function make_cartesian_product_internal(parms, callback, index, args)
46 if index > #parms then
47 return callback(unpack(args))
50 for _, value in ipairs(parms[index]) do
52 ret[value] = make_cartesian_product_internal(parms, callback, index + 1, args)
57 function make_sbs_input(chain, signal, deint, hq)
58 local input = chain:add_live_input(not deint, deint) -- Override bounce only if not deinterlacing.
59 input:connect_signal(signal)
60 local wb_effect = chain:add_effect(WhiteBalanceEffect.new())
62 local resample_effect = nil
63 local resize_effect = nil
65 resample_effect = chain:add_effect(ResampleEffect.new())
67 resize_effect = chain:add_effect(ResizeEffect.new())
70 local padding_effect = chain:add_effect(IntegralPaddingEffect.new())
74 wb_effect = wb_effect,
75 resample_effect = resample_effect,
76 resize_effect = resize_effect,
77 padding_effect = padding_effect
81 -- The main live chain.
82 function make_sbs_chain(input0_deint, input1_deint, hq)
83 local chain = EffectChain.new(16, 9)
85 local input0 = make_sbs_input(chain, INPUT0_SIGNAL_NUM, input0_deint, hq)
86 local input1 = make_sbs_input(chain, INPUT1_SIGNAL_NUM, input1_deint, hq)
88 input0.padding_effect:set_vec4("border_color", 0.0, 0.0, 0.0, 1.0)
89 input1.padding_effect:set_vec4("border_color", 0.0, 0.0, 0.0, 0.0)
91 chain:add_effect(OverlayEffect.new(), input0.padding_effect, input1.padding_effect)
101 -- Make all possible combinations of side-by-side chains.
102 local sbs_chains = make_cartesian_product({
103 {"live", "livedeint"}, -- input0_type
104 {"live", "livedeint"}, -- input1_type
106 }, function(input0_type, input1_type, hq)
107 local input0_deint = (input0_type == "livedeint")
108 local input1_deint = (input1_type == "livedeint")
109 return make_sbs_chain(input0_deint, input1_deint, hq)
112 function make_fade_input(chain, signal, live, deint, scale)
113 local input, wb_effect, resample_effect, last
115 input = chain:add_live_input(false, deint)
116 wb_effect = chain:add_effect(WhiteBalanceEffect.new())
117 input:connect_signal(signal)
120 input = chain:add_effect(ImageInput.new("bg.jpeg"))
124 -- If we cared about this for the non-main inputs, we would have
125 -- checked hq here and invoked ResizeEffect instead.
127 resample_effect = chain:add_effect(ResampleEffect.new())
128 last = resample_effect
133 wb_effect = wb_effect,
134 resample_effect = resample_effect,
139 -- A chain to fade between two inputs, of which either can be a picture
140 -- or a live input. In practice only used live, but we still support the
142 function make_fade_chain(input0_live, input0_deint, input0_scale, input1_live, input1_deint, input1_scale, hq)
143 local chain = EffectChain.new(16, 9)
145 local input0 = make_fade_input(chain, INPUT0_SIGNAL_NUM, input0_live, input0_deint, input0_scale)
146 local input1 = make_fade_input(chain, INPUT1_SIGNAL_NUM, input1_live, input1_deint, input1_scale)
148 local mix_effect = chain:add_effect(MixEffect.new(), input0.last, input1.last)
155 mix_effect = mix_effect
159 -- Chains to fade between two inputs, in various configurations.
160 local fade_chains = make_cartesian_product({
161 {"static", "live", "livedeint"}, -- input0_type
162 {true, false}, -- input0_scale
163 {"static", "live", "livedeint"}, -- input1_type
164 {true, false}, -- input1_scale
166 }, function(input0_type, input0_scale, input1_type, input1_scale, hq)
167 local input0_live = (input0_type ~= "static")
168 local input1_live = (input1_type ~= "static")
169 local input0_deint = (input0_type == "livedeint")
170 local input1_deint = (input1_type == "livedeint")
171 return make_fade_chain(input0_live, input0_deint, input0_scale, input1_live, input1_deint, input1_scale, hq)
174 -- A chain to show a single input on screen.
175 function make_simple_chain(input_deint, input_scale, hq)
176 local chain = EffectChain.new(16, 9)
178 local input = chain:add_live_input(false, input_deint)
179 input:connect_signal(0) -- First input card. Can be changed whenever you want.
180 local wb_effect = chain:add_effect(WhiteBalanceEffect.new())
183 local resample_effect, resize_effect
186 resample_effect = chain:add_effect(ResampleEffect.new())
188 resize_effect = chain:add_effect(ResizeEffect.new())
195 wb_effect = wb_effect,
196 resample_effect = resample_effect,
197 resize_effect = resize_effect
201 -- Make all possible combinations of single-input chains.
202 local simple_chains = make_cartesian_product({
203 {"live", "livedeint"}, -- input_type
204 {true, false}, -- input_scale
206 }, function(input_type, input_scale, hq)
207 local input_deint = (input_type == "livedeint")
208 return make_simple_chain(input_deint, input_scale, hq)
211 -- A chain to show a single static picture on screen (HQ version).
212 local static_chain_hq = EffectChain.new(16, 9)
213 local static_chain_hq_input = static_chain_hq:add_effect(ImageInput.new("bg.jpeg"))
214 static_chain_hq:finalize(true)
216 -- A chain to show a single static picture on screen (LQ version).
217 local static_chain_lq = EffectChain.new(16, 9)
218 local static_chain_lq_input = static_chain_lq:add_effect(ImageInput.new("bg.jpeg"))
219 static_chain_lq:finalize(false)
221 -- Used for indexing into the tables of chains.
222 function get_input_type(signals, signal_num)
223 if signal_num == STATIC_SIGNAL_NUM then
225 elseif signals:get_interlaced(signal_num) then
232 function needs_scale(signals, signal_num, width, height)
233 return (signals:get_width(signal_num) ~= width or signals:get_height(signal_num) ~= height)
236 function set_scale_parameters_if_needed(chain_or_input, width, height)
237 if chain_or_input.resample_effect then
238 chain_or_input.resample_effect:set_int("width", width)
239 chain_or_input.resample_effect:set_int("height", height)
240 elseif chain_or_input.resize_effect then
241 chain_or_input.resize_effect:set_int("width", width)
242 chain_or_input.resize_effect:set_int("height", height)
246 -- Returns the number of outputs in addition to the live (0) and preview (1).
247 -- Called only once, at the start of the program.
248 function num_channels()
252 -- Helper function to write e.g. “60” or “59.94”.
253 function get_frame_rate(signal_num)
254 local nom = last_resolution[signal_num].frame_rate_nom
255 local den = last_resolution[signal_num].frame_rate_den
256 if nom % den == 0 then
259 return string.format("%.2f", num / den)
263 -- Helper function to write e.g. “720p60”.
264 function get_channel_resolution(signal_num)
265 if last_resolution[signal_num] then
266 if last_resolution[signal_num].height == 0 or
267 last_resolution[signal_num].height == 525 then
269 elseif last_resolution[signal_num].interlaced then
270 return last_resolution[signal_num].height .. "i" .. get_frame_rate(signal_num)
272 return last_resolution[signal_num].height .. "p" .. get_frame_rate(signal_num)
279 -- Returns the name for each additional channel (starting from 2).
280 -- Called at the start of the program, and then each frame for live
281 -- channels in case they change resolution.
282 function channel_name(channel)
284 return "Input 1 (" .. get_channel_resolution(0) .. ")"
285 elseif channel == 3 then
286 return "Input 2 (" .. get_channel_resolution(1) .. ")"
287 elseif channel == 4 then
288 return "Side-by-side"
289 elseif channel == 5 then
290 return "Static picture"
294 -- Returns if a given channel supports setting white balance (starting from 2).
295 -- Called only once for each channel, at the start of the program.
296 function supports_set_wb(channel)
297 return channel == 2 or channel == 3
300 -- Gets called with a new gray point when the white balance is changing.
301 -- The color is in linear light (not sRGB gamma).
302 function set_wb(channel, red, green, blue)
304 input0_neutral_color = { red, green, blue }
305 elseif channel == 3 then
306 input1_neutral_color = { red, green, blue }
310 function finish_transitions(t)
311 -- If live is SBS but de-facto single, make it so.
312 if live_signal_num == SBS_SIGNAL_NUM and t >= transition_end and zoom_dst == 1.0 then
313 live_signal_num = zoom_poi
316 -- If live is fade but de-facto single, make it so.
317 if live_signal_num == FADE_SIGNAL_NUM and t >= transition_end then
318 live_signal_num = fade_dst_signal
322 -- Called every frame.
323 function get_transitions(t)
324 finish_transitions(t)
326 if live_signal_num == preview_signal_num then
330 if live_signal_num == SBS_SIGNAL_NUM and t >= transition_start and t <= transition_end then
335 if (live_signal_num == INPUT0_SIGNAL_NUM or
336 live_signal_num == INPUT1_SIGNAL_NUM or
337 live_signal_num == STATIC_SIGNAL_NUM) and
338 (preview_signal_num == INPUT0_SIGNAL_NUM or
339 preview_signal_num == INPUT1_SIGNAL_NUM or
340 preview_signal_num == STATIC_SIGNAL_NUM) then
341 return {"Cut", "", "Fade"}
345 if live_signal_num == SBS_SIGNAL_NUM and
346 (preview_signal_num == INPUT0_SIGNAL_NUM or preview_signal_num == INPUT1_SIGNAL_NUM) then
347 return {"Cut", "Zoom in"}
348 elseif (live_signal_num == INPUT0_SIGNAL_NUM or live_signal_num == INPUT1_SIGNAL_NUM) and
349 preview_signal_num == SBS_SIGNAL_NUM then
350 return {"Cut", "Zoom out"}
356 function transition_clicked(num, t)
359 if live_signal_num == FADE_SIGNAL_NUM then
360 -- Ongoing fade; finish it immediately.
361 finish_transitions(transition_end)
364 local temp = live_signal_num
365 live_signal_num = preview_signal_num
366 preview_signal_num = temp
368 if live_signal_num == SBS_SIGNAL_NUM then
369 -- Just cut to SBS, we need to reset any zooms.
372 transition_start = -2.0
373 transition_end = -1.0
378 finish_transitions(t)
380 if live_signal_num == preview_signal_num then
385 if (live_signal_num == INPUT0_SIGNAL_NUM and preview_signal_num == INPUT1_SIGNAL_NUM) or
386 (live_signal_num == INPUT1_SIGNAL_NUM and preview_signal_num == INPUT0_SIGNAL_NUM) then
387 -- We can't zoom between these. Just make a cut.
388 io.write("Cutting from " .. live_signal_num .. " to " .. live_signal_num .. "\n")
389 local temp = live_signal_num
390 live_signal_num = preview_signal_num
391 preview_signal_num = temp
395 if live_signal_num == SBS_SIGNAL_NUM and
396 (preview_signal_num == INPUT0_SIGNAL_NUM or preview_signal_num == INPUT1_SIGNAL_NUM) then
397 -- Zoom in from SBS to single.
399 transition_end = t + 1.0
402 zoom_poi = preview_signal_num
403 preview_signal_num = SBS_SIGNAL_NUM
404 elseif (live_signal_num == INPUT0_SIGNAL_NUM or live_signal_num == INPUT1_SIGNAL_NUM) and
405 preview_signal_num == SBS_SIGNAL_NUM then
406 -- Zoom out from single to SBS.
408 transition_end = t + 1.0
411 preview_signal_num = live_signal_num
412 zoom_poi = live_signal_num
413 live_signal_num = SBS_SIGNAL_NUM
416 finish_transitions(t)
419 if (live_signal_num ~= preview_signal_num) and
420 (live_signal_num == INPUT0_SIGNAL_NUM or
421 live_signal_num == INPUT1_SIGNAL_NUM or
422 live_signal_num == STATIC_SIGNAL_NUM) and
423 (preview_signal_num == INPUT0_SIGNAL_NUM or
424 preview_signal_num == INPUT1_SIGNAL_NUM or
425 preview_signal_num == STATIC_SIGNAL_NUM) then
427 transition_end = t + 1.0
428 fade_src_signal = live_signal_num
429 fade_dst_signal = preview_signal_num
430 preview_signal_num = live_signal_num
431 live_signal_num = FADE_SIGNAL_NUM
433 -- Fades involving SBS are ignored (we have no chain for it).
438 function channel_clicked(num)
439 preview_signal_num = num
442 -- Called every frame. Get the chain for displaying at input <num>,
443 -- where 0 is live, 1 is preview, 2 is the first channel to display
444 -- in the bottom bar, and so on up to num_channels()+1. t is the
445 -- current time in seconds. width and height are the dimensions of
446 -- the output, although you can ignore them if you don't need them
447 -- (they're useful if you want to e.g. know what to resample by).
449 -- <signals> is basically an exposed InputState, which you can use to
450 -- query for information about the signals at the point of the current
451 -- frame. In particular, you can call get_width() and get_height()
452 -- for any signal number, and use that to e.g. assist in chain selection.
454 -- You should return two objects; the chain itself, and then a
455 -- function (taking no parameters) that is run just before rendering.
456 -- The function needs to call connect_signal on any inputs, so that
457 -- it gets updated video data for the given frame. (You are allowed
458 -- to switch which input your input is getting from between frames,
459 -- but not calling connect_signal results in undefined behavior.)
460 -- If you want to change any parameters in the chain, this is also
463 -- NOTE: The chain returned must be finalized with the Y'CbCr flag
464 -- if and only if num==0.
465 function get_chain(num, t, width, height, signals)
466 local input_resolution = {}
467 for signal_num=0,1 do
469 width = signals:get_width(signal_num),
470 height = signals:get_height(signal_num),
471 interlaced = signals:get_interlaced(signal_num),
472 frame_rate_nom = signals:get_frame_rate_nom(signal_num),
473 frame_rate_den = signals:get_frame_rate_den(signal_num)
476 if res.interlaced then
477 -- Convert height from frame height to field height.
478 -- (Needed for e.g. place_rectangle.)
479 res.height = res.height * 2
481 -- Show field rate instead of frame rate; really for cosmetics only
482 -- (and actually contrary to EBU recommendations, although in line
483 -- with typical user expectations).
484 res.frame_rate_nom = res.frame_rate_nom * 2
487 input_resolution[signal_num] = res
489 last_resolution = input_resolution
491 if num == 0 then -- Live.
492 if live_signal_num == INPUT0_SIGNAL_NUM or live_signal_num == INPUT1_SIGNAL_NUM then -- Plain input.
493 local input_type = get_input_type(signals, live_signal_num)
494 local input_scale = needs_scale(signals, live_signal_num, width, height)
495 local chain = simple_chains[input_type][input_scale][true]
497 chain.input:connect_signal(live_signal_num)
498 set_scale_parameters_if_needed(chain, width, height)
499 set_neutral_color_from_signal(chain.wb_effect, live_signal_num)
501 return chain.chain, prepare
502 elseif live_signal_num == STATIC_SIGNAL_NUM then -- Static picture.
505 return static_chain_hq, prepare
506 elseif live_signal_num == FADE_SIGNAL_NUM then -- Fade.
507 local input0_type = get_input_type(signals, fade_src_signal)
508 local input0_scale = needs_scale(signals, fade_src_signal, width, height)
509 local input1_type = get_input_type(signals, fade_dst_signal)
510 local input1_scale = needs_scale(signals, fade_dst_signal, width, height)
511 local chain = fade_chains[input0_type][input0_scale][input1_type][input1_scale][true]
513 if input0_type == "live" then
514 chain.input0.input:connect_signal(fade_src_signal)
515 set_neutral_color_from_signal(chain.input0.wb_effect, fade_src_signal)
517 set_scale_parameters_if_needed(chain.input0, width, height)
518 if input1_type == "live" then
519 chain.input1.input:connect_signal(fade_dst_signal)
520 set_neutral_color_from_signal(chain.input1.wb_effect, fade_dst_signal)
522 set_scale_parameters_if_needed(chain.input1, width, height)
523 local tt = calc_fade_progress(t, transition_start, transition_end)
525 chain.mix_effect:set_float("strength_first", 1.0 - tt)
526 chain.mix_effect:set_float("strength_second", tt)
528 return chain.chain, prepare
531 -- SBS code (live_signal_num == SBS_SIGNAL_NUM).
532 local input0_type = get_input_type(signals, INPUT0_SIGNAL_NUM)
533 local input1_type = get_input_type(signals, INPUT1_SIGNAL_NUM)
534 if t > transition_end and zoom_dst == 1.0 then
535 -- Special case: Show only the single image on screen.
536 local input0_scale = needs_scale(signals, fade_src_signal, width, height)
537 local chain = simple_chains[input0_type][input0_scale][true]
539 chain.input:connect_signal(INPUT0_SIGNAL_NUM)
540 set_scale_parameters_if_needed(chain, width, height)
541 set_neutral_color(chain.wb_effect, input0_neutral_color)
543 return chain.chain, prepare
545 local chain = sbs_chains[input0_type][input1_type][true]
547 if t < transition_start then
548 prepare_sbs_chain(chain, zoom_src, width, height, input_resolution)
549 elseif t > transition_end then
550 prepare_sbs_chain(chain, zoom_dst, width, height, input_resolution)
552 local tt = (t - transition_start) / (transition_end - transition_start)
554 tt = math.sin(tt * 3.14159265358 * 0.5)
555 prepare_sbs_chain(chain, zoom_src + (zoom_dst - zoom_src) * tt, width, height, input_resolution)
558 return chain.chain, prepare
560 if num == 1 then -- Preview.
561 num = preview_signal_num + 2
564 -- Individual preview inputs.
565 if num == INPUT0_SIGNAL_NUM + 2 then
566 local input_type = get_input_type(signals, INPUT0_SIGNAL_NUM)
567 local input_scale = needs_scale(signals, INPUT0_SIGNAL_NUM, width, height)
568 local chain = simple_chains[input_type][input_scale][false]
570 chain.input:connect_signal(INPUT0_SIGNAL_NUM)
571 set_scale_parameters_if_needed(chain, width, height)
572 set_neutral_color(chain.wb_effect, input0_neutral_color)
574 return chain.chain, prepare
576 if num == INPUT1_SIGNAL_NUM + 2 then
577 local input_type = get_input_type(signals, INPUT1_SIGNAL_NUM)
578 local input_scale = needs_scale(signals, INPUT1_SIGNAL_NUM, width, height)
579 local chain = simple_chains[input_type][input_scale][false]
581 chain.input:connect_signal(INPUT1_SIGNAL_NUM)
582 set_scale_parameters_if_needed(chain, width, height)
583 set_neutral_color(chain.wb_effect, input1_neutral_color)
585 return chain.chain, prepare
587 if num == SBS_SIGNAL_NUM + 2 then
588 local input0_type = get_input_type(signals, INPUT0_SIGNAL_NUM)
589 local input1_type = get_input_type(signals, INPUT1_SIGNAL_NUM)
590 local chain = sbs_chains[input0_type][input1_type][false]
592 prepare_sbs_chain(chain, 0.0, width, height, input_resolution)
594 return chain.chain, prepare
596 if num == STATIC_SIGNAL_NUM + 2 then
599 return static_chain_lq, prepare
603 function place_rectangle(resample_effect, resize_effect, padding_effect, x0, y0, x1, y1, screen_width, screen_height, input_width, input_height)
610 if x0 > screen_width or x1 < 0.0 or y0 > screen_height or y1 < 0.0 then
611 resample_effect:set_int("width", 1)
612 resample_effect:set_int("height", 1)
613 resample_effect:set_float("zoom_x", screen_width)
614 resample_effect:set_float("zoom_y", screen_height)
615 padding_effect:set_int("left", screen_width + 100)
616 padding_effect:set_int("top", screen_height + 100)
622 srcx0 = -x0 / (x1 - x0)
626 srcy0 = -y0 / (y1 - y0)
629 if x1 > screen_width then
630 srcx1 = (screen_width - x0) / (x1 - x0)
633 if y1 > screen_height then
634 srcy1 = (screen_height - y0) / (y1 - y0)
638 if resample_effect ~= nil then
639 -- High-quality resampling.
640 local x_subpixel_offset = x0 - math.floor(x0)
641 local y_subpixel_offset = y0 - math.floor(y0)
643 -- Resampling must be to an integral number of pixels. Round up,
644 -- and then add an extra pixel so we have some leeway for the border.
645 local width = math.ceil(x1 - x0) + 1
646 local height = math.ceil(y1 - y0) + 1
647 resample_effect:set_int("width", width)
648 resample_effect:set_int("height", height)
650 -- Correct the discrepancy with zoom. (This will leave a small
651 -- excess edge of pixels and subpixels, which we'll correct for soon.)
652 local zoom_x = (x1 - x0) / (width * (srcx1 - srcx0))
653 local zoom_y = (y1 - y0) / (height * (srcy1 - srcy0))
654 resample_effect:set_float("zoom_x", zoom_x)
655 resample_effect:set_float("zoom_y", zoom_y)
656 resample_effect:set_float("zoom_center_x", 0.0)
657 resample_effect:set_float("zoom_center_y", 0.0)
659 -- Padding must also be to a whole-pixel offset.
660 padding_effect:set_int("left", math.floor(x0))
661 padding_effect:set_int("top", math.floor(y0))
663 -- Correct _that_ discrepancy by subpixel offset in the resampling.
664 resample_effect:set_float("left", srcx0 * input_width - x_subpixel_offset / zoom_x)
665 resample_effect:set_float("top", srcy0 * input_height - y_subpixel_offset / zoom_y)
667 -- Finally, adjust the border so it is exactly where we want it.
668 padding_effect:set_float("border_offset_left", x_subpixel_offset)
669 padding_effect:set_float("border_offset_right", x1 - (math.floor(x0) + width))
670 padding_effect:set_float("border_offset_top", y_subpixel_offset)
671 padding_effect:set_float("border_offset_bottom", y1 - (math.floor(y0) + height))
673 -- Lower-quality simple resizing.
674 local width = round(x1 - x0)
675 local height = round(y1 - y0)
676 resize_effect:set_int("width", width)
677 resize_effect:set_int("height", height)
679 -- Padding must also be to a whole-pixel offset.
680 padding_effect:set_int("left", math.floor(x0))
681 padding_effect:set_int("top", math.floor(y0))
685 -- This is broken, of course (even for positive numbers), but Lua doesn't give us access to real rounding.
687 return math.floor(x + 0.5)
690 function lerp(a, b, t)
691 return a + (b - a) * t
694 function prepare_sbs_chain(chain, t, screen_width, screen_height, input_resolution)
695 chain.input0.input:connect_signal(0)
696 chain.input1.input:connect_signal(1)
697 set_neutral_color(chain.input0.wb_effect, input0_neutral_color)
698 set_neutral_color(chain.input1.wb_effect, input1_neutral_color)
700 -- First input is positioned (16,48) from top-left.
701 local width0 = round(848 * screen_width/1280.0)
702 local height0 = round(width0 * 9.0 / 16.0)
704 local top0 = 48 * screen_height/720.0
705 local left0 = 16 * screen_width/1280.0
706 local bottom0 = top0 + height0
707 local right0 = left0 + width0
709 -- Second input is positioned (16,48) from the bottom-right.
710 local width1 = round(384 * screen_width/1280.0)
711 local height1 = round(216 * screen_height/720.0)
713 local bottom1 = screen_height - 48 * screen_height/720.0
714 local right1 = screen_width - 16 * screen_width/1280.0
715 local top1 = bottom1 - height1
716 local left1 = right1 - width1
718 -- Interpolate between the fullscreen and side-by-side views.
719 local scale0, tx0, tx0
720 if zoom_poi == INPUT0_SIGNAL_NUM then
721 local new_left0 = lerp(left0, 0, t)
722 local new_right0 = lerp(right0, screen_width, t)
723 local new_top0 = lerp(top0, 0, t)
724 local new_bottom0 = lerp(bottom0, screen_height, t)
726 scale0 = (new_right0 - new_left0) / width0 -- Same vertically and horizonally.
727 tx0 = new_left0 - left0 * scale0
728 ty0 = new_top0 - top0 * scale0
730 local new_left1 = lerp(left1, 0, t)
731 local new_right1 = lerp(right1, screen_width, t)
732 local new_top1 = lerp(top1, 0, t)
733 local new_bottom1 = lerp(bottom1, screen_height, t)
735 scale0 = (new_right1 - new_left1) / width1 -- Same vertically and horizonally.
736 tx0 = new_left1 - left1 * scale0
737 ty0 = new_top1 - top1 * scale0
740 top0 = top0 * scale0 + ty0
741 bottom0 = bottom0 * scale0 + ty0
742 left0 = left0 * scale0 + tx0
743 right0 = right0 * scale0 + tx0
745 top1 = top1 * scale0 + ty0
746 bottom1 = bottom1 * scale0 + ty0
747 left1 = left1 * scale0 + tx0
748 right1 = right1 * scale0 + tx0
749 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)
750 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)
753 function set_neutral_color(effect, color)
754 effect:set_vec3("neutral_color", color[1], color[2], color[3])
757 function set_neutral_color_from_signal(effect, signal)
758 if signal == INPUT0_SIGNAL_NUM then
759 set_neutral_color(effect, input0_neutral_color)
761 set_neutral_color(effect, input1_neutral_color)
765 function calc_fade_progress(t, transition_start, transition_end)
766 local tt = (t - transition_start) / (transition_end - transition_start)
773 -- Make the fade look maybe a tad more natural, by pumping it
774 -- through a sigmoid function.
776 tt = 1.0 / (1.0 + math.exp(-tt))