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/frame rate 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)
61 local resample_effect = nil
62 local resize_effect = nil
64 resample_effect = chain:add_effect(ResampleEffect.new())
66 resize_effect = chain:add_effect(ResizeEffect.new())
68 local wb_effect = chain:add_effect(WhiteBalanceEffect.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 input:connect_signal(signal)
119 input = chain:add_effect(ImageInput.new("bg.jpeg"))
123 -- If we cared about this for the non-main inputs, we would have
124 -- checked hq here and invoked ResizeEffect instead.
126 resample_effect = chain:add_effect(ResampleEffect.new())
127 last = resample_effect
130 -- Make sure to put the white balance after the scaling (usually more efficient).
132 wb_effect = chain:add_effect(WhiteBalanceEffect.new())
138 wb_effect = wb_effect,
139 resample_effect = resample_effect,
144 -- A chain to fade between two inputs, of which either can be a picture
145 -- or a live input. In practice only used live, but we still support the
147 function make_fade_chain(input0_live, input0_deint, input0_scale, input1_live, input1_deint, input1_scale, hq)
148 local chain = EffectChain.new(16, 9)
150 local input0 = make_fade_input(chain, INPUT0_SIGNAL_NUM, input0_live, input0_deint, input0_scale)
151 local input1 = make_fade_input(chain, INPUT1_SIGNAL_NUM, input1_live, input1_deint, input1_scale)
153 local mix_effect = chain:add_effect(MixEffect.new(), input0.last, input1.last)
160 mix_effect = mix_effect
164 -- Chains to fade between two inputs, in various configurations.
165 local fade_chains = make_cartesian_product({
166 {"static", "live", "livedeint"}, -- input0_type
167 {true, false}, -- input0_scale
168 {"static", "live", "livedeint"}, -- input1_type
169 {true, false}, -- input1_scale
171 }, function(input0_type, input0_scale, input1_type, input1_scale, hq)
172 local input0_live = (input0_type ~= "static")
173 local input1_live = (input1_type ~= "static")
174 local input0_deint = (input0_type == "livedeint")
175 local input1_deint = (input1_type == "livedeint")
176 return make_fade_chain(input0_live, input0_deint, input0_scale, input1_live, input1_deint, input1_scale, hq)
179 -- A chain to show a single input on screen.
180 function make_simple_chain(input_deint, input_scale, hq)
181 local chain = EffectChain.new(16, 9)
183 local input = chain:add_live_input(false, input_deint)
184 input:connect_signal(0) -- First input card. Can be changed whenever you want.
186 local resample_effect, resize_effect
189 resample_effect = chain:add_effect(ResampleEffect.new())
191 resize_effect = chain:add_effect(ResizeEffect.new())
195 local wb_effect = chain:add_effect(WhiteBalanceEffect.new())
201 wb_effect = wb_effect,
202 resample_effect = resample_effect,
203 resize_effect = resize_effect
207 -- Make all possible combinations of single-input chains.
208 local simple_chains = make_cartesian_product({
209 {"live", "livedeint"}, -- input_type
210 {true, false}, -- input_scale
212 }, function(input_type, input_scale, hq)
213 local input_deint = (input_type == "livedeint")
214 return make_simple_chain(input_deint, input_scale, hq)
217 -- A chain to show a single static picture on screen (HQ version).
218 local static_chain_hq = EffectChain.new(16, 9)
219 local static_chain_hq_input = static_chain_hq:add_effect(ImageInput.new("bg.jpeg"))
220 static_chain_hq:finalize(true)
222 -- A chain to show a single static picture on screen (LQ version).
223 local static_chain_lq = EffectChain.new(16, 9)
224 local static_chain_lq_input = static_chain_lq:add_effect(ImageInput.new("bg.jpeg"))
225 static_chain_lq:finalize(false)
227 -- Used for indexing into the tables of chains.
228 function get_input_type(signals, signal_num)
229 if signal_num == STATIC_SIGNAL_NUM then
231 elseif signals:get_interlaced(signal_num) then
238 function needs_scale(signals, signal_num, width, height)
239 if signal_num == STATIC_SIGNAL_NUM then
240 -- We assume this is already correctly scaled at load time.
243 assert(signal_num == INPUT0_SIGNAL_NUM or signal_num == INPUT1_SIGNAL_NUM)
244 return (signals:get_width(signal_num) ~= width or signals:get_height(signal_num) ~= height)
247 function set_scale_parameters_if_needed(chain_or_input, width, height)
248 if chain_or_input.resample_effect then
249 chain_or_input.resample_effect:set_int("width", width)
250 chain_or_input.resample_effect:set_int("height", height)
251 elseif chain_or_input.resize_effect then
252 chain_or_input.resize_effect:set_int("width", width)
253 chain_or_input.resize_effect:set_int("height", height)
258 -- Returns the number of outputs in addition to the live (0) and preview (1).
259 -- Called only once, at the start of the program.
260 function num_channels()
264 -- Helper function to write e.g. “720p60”. The difference between this
265 -- and get_channel_resolution_raw() is that this one also can say that
266 -- there's no signal.
267 function get_channel_resolution(signal_num)
268 res = last_resolution[signal_num]
269 if (not res) or res.height <= 0 then
272 if not res.has_signal then
273 if res.height == 525 then
274 -- Special mode for the USB3 cards.
277 return get_channel_resolution_raw(res) .. ", no signal"
279 return get_channel_resolution_raw(res)
283 -- Helper function to write e.g. “60” or “59.94”.
284 function get_frame_rate(res)
285 local nom = res.frame_rate_nom
286 local den = res.frame_rate_den
287 if nom % den == 0 then
290 return string.format("%.2f", nom / den)
294 -- Helper function to write e.g. “720p60”.
295 function get_channel_resolution_raw(res)
296 if res.interlaced then
297 return res.height .. "i" .. get_frame_rate(res)
299 return res.height .. "p" .. get_frame_rate(res)
304 -- Returns the name for each additional channel (starting from 2).
305 -- Called at the start of the program, and then each frame for live
306 -- channels in case they change resolution.
307 function channel_name(channel)
309 return "Input 1 (" .. get_channel_resolution(0) .. ")"
310 elseif channel == 3 then
311 return "Input 2 (" .. get_channel_resolution(1) .. ")"
312 elseif channel == 4 then
313 return "Side-by-side"
314 elseif channel == 5 then
315 return "Static picture"
320 -- Returns, given a channel number, which signal it corresponds to (starting from 0).
321 -- Should return -1 if the channel does not correspond to a simple signal.
322 -- (The information is used for whether right-click on the channel should bring up
323 -- an input selector or not.)
324 -- Called once for each channel, at the start of the program.
325 -- Will never be called for live (0) or preview (1).
326 function channel_signal(channel)
329 elseif channel == 3 then
337 -- Called every frame. Returns the color (if any) to paint around the given
338 -- channel. Returns a CSS color (typically to mark live and preview signals);
339 -- "transparent" is allowed.
340 -- Will never be called for live (0) or preview (1).
341 function channel_color(channel)
342 if channel_involved_in(channel, live_signal_num) then
345 if channel_involved_in(channel, preview_signal_num) then
351 function channel_involved_in(channel, signal_num)
352 if signal_num == INPUT0_SIGNAL_NUM then
355 if signal_num == INPUT1_SIGNAL_NUM then
358 if signal_num == SBS_SIGNAL_NUM then
359 return (channel == 2 or channel == 3)
361 if signal_num == STATIC_SIGNAL_NUM then
362 return (channel == 5)
364 if signal_num == FADE_SIGNAL_NUM then
365 return (channel_involved_in(channel, fade_src_signal) or
366 channel_involved_in(channel, fade_dst_signal))
372 -- Returns if a given channel supports setting white balance (starting from 2).
373 -- Called only once for each channel, at the start of the program.
374 function supports_set_wb(channel)
375 return channel == 2 or channel == 3
379 -- Gets called with a new gray point when the white balance is changing.
380 -- The color is in linear light (not sRGB gamma).
381 function set_wb(channel, red, green, blue)
383 input0_neutral_color = { red, green, blue }
384 elseif channel == 3 then
385 input1_neutral_color = { red, green, blue }
389 function finish_transitions(t)
390 -- If live is SBS but de-facto single, make it so.
391 if live_signal_num == SBS_SIGNAL_NUM and t >= transition_end and zoom_dst == 1.0 then
392 live_signal_num = zoom_poi
395 -- If live is fade but de-facto single, make it so.
396 if live_signal_num == FADE_SIGNAL_NUM and t >= transition_end then
397 live_signal_num = fade_dst_signal
402 -- Called every frame.
403 function get_transitions(t)
404 finish_transitions(t)
406 if live_signal_num == preview_signal_num then
407 -- No transitions possible.
411 if live_signal_num == SBS_SIGNAL_NUM and t >= transition_start and t <= transition_end then
416 if (live_signal_num == INPUT0_SIGNAL_NUM or
417 live_signal_num == INPUT1_SIGNAL_NUM or
418 live_signal_num == STATIC_SIGNAL_NUM) and
419 (preview_signal_num == INPUT0_SIGNAL_NUM or
420 preview_signal_num == INPUT1_SIGNAL_NUM or
421 preview_signal_num == STATIC_SIGNAL_NUM) then
422 return {"Cut", "", "Fade"}
426 if live_signal_num == SBS_SIGNAL_NUM and
427 (preview_signal_num == INPUT0_SIGNAL_NUM or preview_signal_num == INPUT1_SIGNAL_NUM) then
428 return {"Cut", "Zoom in"}
429 elseif (live_signal_num == INPUT0_SIGNAL_NUM or live_signal_num == INPUT1_SIGNAL_NUM) and
430 preview_signal_num == SBS_SIGNAL_NUM then
431 return {"Cut", "Zoom out"}
438 -- Called when the user clicks a transition button.
439 function transition_clicked(num, t)
442 if live_signal_num == FADE_SIGNAL_NUM then
443 -- Ongoing fade; finish it immediately.
444 finish_transitions(transition_end)
447 local temp = live_signal_num
448 live_signal_num = preview_signal_num
449 preview_signal_num = temp
451 if live_signal_num == SBS_SIGNAL_NUM then
452 -- Just cut to SBS, we need to reset any zooms.
455 transition_start = -2.0
456 transition_end = -1.0
461 finish_transitions(t)
463 if live_signal_num == preview_signal_num then
468 if (live_signal_num == INPUT0_SIGNAL_NUM and preview_signal_num == INPUT1_SIGNAL_NUM) or
469 (live_signal_num == INPUT1_SIGNAL_NUM and preview_signal_num == INPUT0_SIGNAL_NUM) then
470 -- We can't zoom between these. Just make a cut.
471 io.write("Cutting from " .. live_signal_num .. " to " .. live_signal_num .. "\n")
472 local temp = live_signal_num
473 live_signal_num = preview_signal_num
474 preview_signal_num = temp
478 if live_signal_num == SBS_SIGNAL_NUM and
479 (preview_signal_num == INPUT0_SIGNAL_NUM or preview_signal_num == INPUT1_SIGNAL_NUM) then
480 -- Zoom in from SBS to single.
482 transition_end = t + 1.0
485 zoom_poi = preview_signal_num
486 preview_signal_num = SBS_SIGNAL_NUM
487 elseif (live_signal_num == INPUT0_SIGNAL_NUM or live_signal_num == INPUT1_SIGNAL_NUM) and
488 preview_signal_num == SBS_SIGNAL_NUM then
489 -- Zoom out from single to SBS.
491 transition_end = t + 1.0
494 preview_signal_num = live_signal_num
495 zoom_poi = live_signal_num
496 live_signal_num = SBS_SIGNAL_NUM
499 finish_transitions(t)
502 if (live_signal_num ~= preview_signal_num) and
503 (live_signal_num == INPUT0_SIGNAL_NUM or
504 live_signal_num == INPUT1_SIGNAL_NUM or
505 live_signal_num == STATIC_SIGNAL_NUM) and
506 (preview_signal_num == INPUT0_SIGNAL_NUM or
507 preview_signal_num == INPUT1_SIGNAL_NUM or
508 preview_signal_num == STATIC_SIGNAL_NUM) then
510 transition_end = t + 1.0
511 fade_src_signal = live_signal_num
512 fade_dst_signal = preview_signal_num
513 preview_signal_num = live_signal_num
514 live_signal_num = FADE_SIGNAL_NUM
516 -- Fades involving SBS are ignored (we have no chain for it).
522 function channel_clicked(num)
523 preview_signal_num = num
527 -- Called every frame. Get the chain for displaying at input <num>,
528 -- where 0 is live, 1 is preview, 2 is the first channel to display
529 -- in the bottom bar, and so on up to num_channels()+1. t is the
530 -- current time in seconds. width and height are the dimensions of
531 -- the output, although you can ignore them if you don't need them
532 -- (they're useful if you want to e.g. know what to resample by).
534 -- <signals> is basically an exposed InputState, which you can use to
535 -- query for information about the signals at the point of the current
536 -- frame. In particular, you can call get_width() and get_height()
537 -- for any signal number, and use that to e.g. assist in chain selection.
539 -- You should return two objects; the chain itself, and then a
540 -- function (taking no parameters) that is run just before rendering.
541 -- The function needs to call connect_signal on any inputs, so that
542 -- it gets updated video data for the given frame. (You are allowed
543 -- to switch which input your input is getting from between frames,
544 -- but not calling connect_signal results in undefined behavior.)
545 -- If you want to change any parameters in the chain, this is also
548 -- NOTE: The chain returned must be finalized with the Y'CbCr flag
549 -- if and only if num==0.
550 function get_chain(num, t, width, height, signals)
551 local input_resolution = {}
552 for signal_num=0,1 do
554 width = signals:get_width(signal_num),
555 height = signals:get_height(signal_num),
556 interlaced = signals:get_interlaced(signal_num),
557 has_signal = signals:get_has_signal(signal_num),
558 frame_rate_nom = signals:get_frame_rate_nom(signal_num),
559 frame_rate_den = signals:get_frame_rate_den(signal_num)
562 if res.interlaced then
563 -- Convert height from frame height to field height.
564 -- (Needed for e.g. place_rectangle.)
565 res.height = res.height * 2
567 -- Show field rate instead of frame rate; really for cosmetics only
568 -- (and actually contrary to EBU recommendations, although in line
569 -- with typical user expectations).
570 res.frame_rate_nom = res.frame_rate_nom * 2
573 input_resolution[signal_num] = res
575 last_resolution = input_resolution
577 if num == 0 then -- Live.
578 if live_signal_num == INPUT0_SIGNAL_NUM or live_signal_num == INPUT1_SIGNAL_NUM then -- Plain input.
579 local input_type = get_input_type(signals, live_signal_num)
580 local input_scale = needs_scale(signals, live_signal_num, width, height)
581 local chain = simple_chains[input_type][input_scale][true]
583 chain.input:connect_signal(live_signal_num)
584 set_scale_parameters_if_needed(chain, width, height)
585 set_neutral_color_from_signal(chain.wb_effect, live_signal_num)
587 return chain.chain, prepare
588 elseif live_signal_num == STATIC_SIGNAL_NUM then -- Static picture.
591 return static_chain_hq, prepare
592 elseif live_signal_num == FADE_SIGNAL_NUM then -- Fade.
593 local input0_type = get_input_type(signals, fade_src_signal)
594 local input0_scale = needs_scale(signals, fade_src_signal, width, height)
595 local input1_type = get_input_type(signals, fade_dst_signal)
596 local input1_scale = needs_scale(signals, fade_dst_signal, width, height)
597 local chain = fade_chains[input0_type][input0_scale][input1_type][input1_scale][true]
599 if input0_type == "live" or input0_type == "livedeint" then
600 chain.input0.input:connect_signal(fade_src_signal)
601 set_neutral_color_from_signal(chain.input0.wb_effect, fade_src_signal)
603 set_scale_parameters_if_needed(chain.input0, width, height)
604 if input1_type == "live" or input1_type == "livedeint" then
605 chain.input1.input:connect_signal(fade_dst_signal)
606 set_neutral_color_from_signal(chain.input1.wb_effect, fade_dst_signal)
608 set_scale_parameters_if_needed(chain.input1, width, height)
609 local tt = calc_fade_progress(t, transition_start, transition_end)
611 chain.mix_effect:set_float("strength_first", 1.0 - tt)
612 chain.mix_effect:set_float("strength_second", tt)
614 return chain.chain, prepare
617 -- SBS code (live_signal_num == SBS_SIGNAL_NUM).
618 local input0_type = get_input_type(signals, INPUT0_SIGNAL_NUM)
619 local input1_type = get_input_type(signals, INPUT1_SIGNAL_NUM)
620 if t > transition_end and zoom_dst == 1.0 then
621 -- Special case: Show only the single image on screen.
622 local input0_scale = needs_scale(signals, fade_src_signal, width, height)
623 local chain = simple_chains[input0_type][input0_scale][true]
625 chain.input:connect_signal(INPUT0_SIGNAL_NUM)
626 set_scale_parameters_if_needed(chain, width, height)
627 set_neutral_color(chain.wb_effect, input0_neutral_color)
629 return chain.chain, prepare
631 local chain = sbs_chains[input0_type][input1_type][true]
633 if t < transition_start then
634 prepare_sbs_chain(chain, zoom_src, width, height, input_resolution)
635 elseif t > transition_end then
636 prepare_sbs_chain(chain, zoom_dst, width, height, input_resolution)
638 local tt = (t - transition_start) / (transition_end - transition_start)
640 tt = math.sin(tt * 3.14159265358 * 0.5)
641 prepare_sbs_chain(chain, zoom_src + (zoom_dst - zoom_src) * tt, width, height, input_resolution)
644 return chain.chain, prepare
646 if num == 1 then -- Preview.
647 num = preview_signal_num + 2
650 -- Individual preview inputs.
651 if num == INPUT0_SIGNAL_NUM + 2 then
652 local input_type = get_input_type(signals, INPUT0_SIGNAL_NUM)
653 local input_scale = needs_scale(signals, INPUT0_SIGNAL_NUM, width, height)
654 local chain = simple_chains[input_type][input_scale][false]
656 chain.input:connect_signal(INPUT0_SIGNAL_NUM)
657 set_scale_parameters_if_needed(chain, width, height)
658 set_neutral_color(chain.wb_effect, input0_neutral_color)
660 return chain.chain, prepare
662 if num == INPUT1_SIGNAL_NUM + 2 then
663 local input_type = get_input_type(signals, INPUT1_SIGNAL_NUM)
664 local input_scale = needs_scale(signals, INPUT1_SIGNAL_NUM, width, height)
665 local chain = simple_chains[input_type][input_scale][false]
667 chain.input:connect_signal(INPUT1_SIGNAL_NUM)
668 set_scale_parameters_if_needed(chain, width, height)
669 set_neutral_color(chain.wb_effect, input1_neutral_color)
671 return chain.chain, prepare
673 if num == SBS_SIGNAL_NUM + 2 then
674 local input0_type = get_input_type(signals, INPUT0_SIGNAL_NUM)
675 local input1_type = get_input_type(signals, INPUT1_SIGNAL_NUM)
676 local chain = sbs_chains[input0_type][input1_type][false]
678 prepare_sbs_chain(chain, 0.0, width, height, input_resolution)
680 return chain.chain, prepare
682 if num == STATIC_SIGNAL_NUM + 2 then
685 return static_chain_lq, prepare
689 function place_rectangle(resample_effect, resize_effect, padding_effect, x0, y0, x1, y1, screen_width, screen_height, input_width, input_height)
695 padding_effect:set_int("width", screen_width)
696 padding_effect:set_int("height", screen_height)
699 if x0 > screen_width or x1 < 0.0 or y0 > screen_height or y1 < 0.0 then
700 resample_effect:set_int("width", 1)
701 resample_effect:set_int("height", 1)
702 resample_effect:set_float("zoom_x", screen_width)
703 resample_effect:set_float("zoom_y", screen_height)
704 padding_effect:set_int("left", screen_width + 100)
705 padding_effect:set_int("top", screen_height + 100)
711 srcx0 = -x0 / (x1 - x0)
715 srcy0 = -y0 / (y1 - y0)
718 if x1 > screen_width then
719 srcx1 = (screen_width - x0) / (x1 - x0)
722 if y1 > screen_height then
723 srcy1 = (screen_height - y0) / (y1 - y0)
727 if resample_effect ~= nil then
728 -- High-quality resampling.
729 local x_subpixel_offset = x0 - math.floor(x0)
730 local y_subpixel_offset = y0 - math.floor(y0)
732 -- Resampling must be to an integral number of pixels. Round up,
733 -- and then add an extra pixel so we have some leeway for the border.
734 local width = math.ceil(x1 - x0) + 1
735 local height = math.ceil(y1 - y0) + 1
736 resample_effect:set_int("width", width)
737 resample_effect:set_int("height", height)
739 -- Correct the discrepancy with zoom. (This will leave a small
740 -- excess edge of pixels and subpixels, which we'll correct for soon.)
741 local zoom_x = (x1 - x0) / (width * (srcx1 - srcx0))
742 local zoom_y = (y1 - y0) / (height * (srcy1 - srcy0))
743 resample_effect:set_float("zoom_x", zoom_x)
744 resample_effect:set_float("zoom_y", zoom_y)
745 resample_effect:set_float("zoom_center_x", 0.0)
746 resample_effect:set_float("zoom_center_y", 0.0)
748 -- Padding must also be to a whole-pixel offset.
749 padding_effect:set_int("left", math.floor(x0))
750 padding_effect:set_int("top", math.floor(y0))
752 -- Correct _that_ discrepancy by subpixel offset in the resampling.
753 resample_effect:set_float("left", srcx0 * input_width - x_subpixel_offset / zoom_x)
754 resample_effect:set_float("top", srcy0 * input_height - y_subpixel_offset / zoom_y)
756 -- Finally, adjust the border so it is exactly where we want it.
757 padding_effect:set_float("border_offset_left", x_subpixel_offset)
758 padding_effect:set_float("border_offset_right", x1 - (math.floor(x0) + width))
759 padding_effect:set_float("border_offset_top", y_subpixel_offset)
760 padding_effect:set_float("border_offset_bottom", y1 - (math.floor(y0) + height))
762 -- Lower-quality simple resizing.
763 local width = round(x1 - x0)
764 local height = round(y1 - y0)
765 resize_effect:set_int("width", width)
766 resize_effect:set_int("height", height)
768 -- Padding must also be to a whole-pixel offset.
769 padding_effect:set_int("left", math.floor(x0))
770 padding_effect:set_int("top", math.floor(y0))
774 -- This is broken, of course (even for positive numbers), but Lua doesn't give us access to real rounding.
776 return math.floor(x + 0.5)
779 function lerp(a, b, t)
780 return a + (b - a) * t
783 function prepare_sbs_chain(chain, t, screen_width, screen_height, input_resolution)
784 chain.input0.input:connect_signal(0)
785 chain.input1.input:connect_signal(1)
786 set_neutral_color(chain.input0.wb_effect, input0_neutral_color)
787 set_neutral_color(chain.input1.wb_effect, input1_neutral_color)
789 -- First input is positioned (16,48) from top-left.
790 local width0 = round(848 * screen_width/1280.0)
791 local height0 = round(width0 * 9.0 / 16.0)
793 local top0 = 48 * screen_height/720.0
794 local left0 = 16 * screen_width/1280.0
795 local bottom0 = top0 + height0
796 local right0 = left0 + width0
798 -- Second input is positioned (16,48) from the bottom-right.
799 local width1 = round(384 * screen_width/1280.0)
800 local height1 = round(216 * screen_height/720.0)
802 local bottom1 = screen_height - 48 * screen_height/720.0
803 local right1 = screen_width - 16 * screen_width/1280.0
804 local top1 = bottom1 - height1
805 local left1 = right1 - width1
807 -- Interpolate between the fullscreen and side-by-side views.
808 local scale0, tx0, tx0
809 if zoom_poi == INPUT0_SIGNAL_NUM then
810 local new_left0 = lerp(left0, 0, t)
811 local new_right0 = lerp(right0, screen_width, t)
812 local new_top0 = lerp(top0, 0, t)
813 local new_bottom0 = lerp(bottom0, screen_height, t)
815 scale0 = (new_right0 - new_left0) / width0 -- Same vertically and horizonally.
816 tx0 = new_left0 - left0 * scale0
817 ty0 = new_top0 - top0 * scale0
819 local new_left1 = lerp(left1, 0, t)
820 local new_right1 = lerp(right1, screen_width, t)
821 local new_top1 = lerp(top1, 0, t)
822 local new_bottom1 = lerp(bottom1, screen_height, t)
824 scale0 = (new_right1 - new_left1) / width1 -- Same vertically and horizonally.
825 tx0 = new_left1 - left1 * scale0
826 ty0 = new_top1 - top1 * scale0
829 top0 = top0 * scale0 + ty0
830 bottom0 = bottom0 * scale0 + ty0
831 left0 = left0 * scale0 + tx0
832 right0 = right0 * scale0 + tx0
834 top1 = top1 * scale0 + ty0
835 bottom1 = bottom1 * scale0 + ty0
836 left1 = left1 * scale0 + tx0
837 right1 = right1 * scale0 + tx0
838 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)
839 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)
842 function set_neutral_color(effect, color)
843 effect:set_vec3("neutral_color", color[1], color[2], color[3])
846 function set_neutral_color_from_signal(effect, signal)
847 if signal == INPUT0_SIGNAL_NUM then
848 set_neutral_color(effect, input0_neutral_color)
850 set_neutral_color(effect, input1_neutral_color)
854 function calc_fade_progress(t, transition_start, transition_end)
855 local tt = (t - transition_start) / (transition_end - transition_start)
862 -- Make the fade look maybe a tad more natural, by pumping it
863 -- through a sigmoid function.
865 tt = 1.0 / (1.0 + math.exp(-tt))