+++ /dev/null
--- The theme is what decides what's actually shown on screen, what kind of
--- transitions are available (if any), and what kind of inputs there are,
--- if any. In general, it drives the entire display logic by creating Movit
--- chains, setting their parameters and then deciding which to show when.
---
--- Themes are written in Lua, which reflects a simplified form of the Movit API
--- where all the low-level details (such as texture formats) are handled by the
--- C++ side and you generally just build chains.
-
-local state = {
- transition_start = -2.0,
- transition_end = -1.0,
- transition_type = 0,
- transition_src_signal = 0,
- transition_dst_signal = 0,
-
- neutral_colors = {
- {0.5, 0.5, 0.5}, -- Input 0.
- {0.5, 0.5, 0.5} -- Input 1.
- },
-
- live_signal_num = 0,
- preview_signal_num = 1
-}
-
--- 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
-
--- Valid values for transition_type. (Cuts are done directly, so they need no entry.)
-local NO_TRANSITION = 0
-local ZOOM_TRANSITION = 1 -- Also for slides.
-local FADE_TRANSITION = 2
-
--- Last width/height/frame rate for each channel, if we have it.
--- Note that unlike the values we get from Nageru, the resolution is per
--- frame and not per field, since we deinterlace.
-local last_resolution = {}
-
--- Utility function to help creating many similar chains that can differ
--- in a free set of chosen parameters.
-function make_cartesian_product(parms, callback)
- return make_cartesian_product_internal(parms, callback, 1, {})
-end
-
-function make_cartesian_product_internal(parms, callback, index, args)
- if index > #parms then
- return callback(unpack(args))
- end
- local ret = {}
- for _, value in ipairs(parms[index]) do
- args[index] = value
- ret[value] = make_cartesian_product_internal(parms, callback, index + 1, args)
- end
- return ret
-end
-
-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 resample_effect = nil
- local resize_effect = nil
- if (hq) then
- resample_effect = chain:add_effect(ResampleEffect.new())
- else
- resize_effect = chain:add_effect(ResizeEffect.new())
- end
- local wb_effect = chain:add_effect(WhiteBalanceEffect.new())
-
- local padding_effect = chain:add_effect(IntegralPaddingEffect.new())
-
- 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_type, input1_type, hq)
- local chain = EffectChain.new(16, 9)
-
- local input0 = make_sbs_input(chain, INPUT0_SIGNAL_NUM, input0_type == "livedeint", hq)
- local input1 = make_sbs_input(chain, INPUT1_SIGNAL_NUM, input1_type == "livedeint", 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 = make_cartesian_product({
- {"live", "livedeint"}, -- input0_type
- {"live", "livedeint"}, -- input1_type
- {true, false} -- hq
-}, function(input0_type, input1_type, hq)
- return make_sbs_chain(input0_type, input1_type, hq)
-end)
-
-function make_fade_input(chain, signal, live, deint, scale)
- local input, wb_effect, resample_effect, last
- if live then
- input = chain:add_live_input(false, deint)
- input:connect_signal(signal)
- last = input
- else
- input = chain:add_effect(ImageInput.new("bg.jpeg"))
- last = input
- end
-
- -- If we cared about this for the non-main inputs, we would have
- -- checked hq here and invoked ResizeEffect instead.
- if scale then
- resample_effect = chain:add_effect(ResampleEffect.new())
- last = resample_effect
- end
-
- -- Make sure to put the white balance after the scaling (usually more efficient).
- if live then
- wb_effect = chain:add_effect(WhiteBalanceEffect.new())
- last = wb_effect
- end
-
- return {
- input = input,
- wb_effect = wb_effect,
- resample_effect = resample_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, input0_scale, input1_live, input1_deint, input1_scale, hq)
- local chain = EffectChain.new(16, 9)
-
- local input0 = make_fade_input(chain, INPUT0_SIGNAL_NUM, input0_live, input0_deint, input0_scale)
- local input1 = make_fade_input(chain, INPUT1_SIGNAL_NUM, input1_live, input1_deint, input1_scale)
-
- 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 = make_cartesian_product({
- {"static", "live", "livedeint"}, -- input0_type
- {true, false}, -- input0_scale
- {"static", "live", "livedeint"}, -- input1_type
- {true, false}, -- input1_scale
- {true} -- hq
-}, function(input0_type, input0_scale, input1_type, input1_scale, hq)
- local input0_live = (input0_type ~= "static")
- local input1_live = (input1_type ~= "static")
- local input0_deint = (input0_type == "livedeint")
- local input1_deint = (input1_type == "livedeint")
- return make_fade_chain(input0_live, input0_deint, input0_scale, input1_live, input1_deint, input1_scale, hq)
-end)
-
--- A chain to show a single input on screen.
-function make_simple_chain(input_deint, input_scale, 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 resample_effect, resize_effect
- if input_scale then
- if hq then
- resample_effect = chain:add_effect(ResampleEffect.new())
- else
- resize_effect = chain:add_effect(ResizeEffect.new())
- end
- end
-
- local wb_effect = chain:add_effect(WhiteBalanceEffect.new())
- chain:finalize(hq)
-
- return {
- chain = chain,
- input = input,
- wb_effect = wb_effect,
- resample_effect = resample_effect,
- resize_effect = resize_effect
- }
-end
-
--- Make all possible combinations of single-input chains.
-local simple_chains = make_cartesian_product({
- {"live", "livedeint"}, -- input_type
- {true, false}, -- input_scale
- {true, false} -- hq
-}, function(input_type, input_scale, hq)
- local input_deint = (input_type == "livedeint")
- return make_simple_chain(input_deint, input_scale, hq)
-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
-
-function needs_scale(signals, signal_num, width, height)
- if signal_num == STATIC_SIGNAL_NUM then
- -- We assume this is already correctly scaled at load time.
- return false
- end
- assert(is_plain_signal(signal_num))
- return (signals:get_width(signal_num) ~= width or signals:get_height(signal_num) ~= height)
-end
-
-function set_scale_parameters_if_needed(chain_or_input, width, height)
- if chain_or_input.resample_effect then
- chain_or_input.resample_effect:set_int("width", width)
- chain_or_input.resample_effect:set_int("height", height)
- elseif chain_or_input.resize_effect then
- chain_or_input.resize_effect:set_int("width", width)
- chain_or_input.resize_effect:set_int("height", height)
- end
-end
-
--- API ENTRY POINT
--- 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 4
-end
-
-function is_plain_signal(num)
- return num == INPUT0_SIGNAL_NUM or num == INPUT1_SIGNAL_NUM
-end
-
--- Helper function to write e.g. “720p60”. The difference between this
--- and get_channel_resolution_raw() is that this one also can say that
--- there's no signal.
-function get_channel_resolution(signal_num)
- local res = last_resolution[signal_num]
- if (not res) or not res.is_connected then
- return "disconnected"
- end
- if res.height <= 0 then
- return "no signal"
- end
- if not res.has_signal then
- if res.height == 525 then
- -- Special mode for the USB3 cards.
- return "no signal"
- end
- return get_channel_resolution_raw(res) .. ", no signal"
- else
- return get_channel_resolution_raw(res)
- end
-end
-
--- Helper function to write e.g. “60” or “59.94”.
-function get_frame_rate(res)
- local nom = res.frame_rate_nom
- local den = res.frame_rate_den
- if nom % den == 0 then
- return nom / den
- else
- return string.format("%.2f", nom / den)
- end
-end
-
--- Helper function to write e.g. “720p60”.
-function get_channel_resolution_raw(res)
- if res.interlaced then
- return res.height .. "i" .. get_frame_rate(res)
- else
- return res.height .. "p" .. get_frame_rate(res)
- end
-end
-
--- API ENTRY POINT
--- Returns the name for each additional channel (starting from 2).
--- Called at the start of the program, and then each frame for live
--- channels in case they change resolution.
-function channel_name(channel)
- local signal_num = channel - 2
- if is_plain_signal(signal_num) then
- return "Input " .. (signal_num + 1) .. " (" .. get_channel_resolution(signal_num) .. ")"
- elseif signal_num == SBS_SIGNAL_NUM then
- return "Side-by-side"
- elseif signal_num == STATIC_SIGNAL_NUM then
- return "Static picture"
- end
-end
-
--- API ENTRY POINT
--- Returns, given a channel number, which signal it corresponds to (starting from 0).
--- Should return -1 if the channel does not correspond to a simple signal
--- (one connected to a capture card, or a video input). The information is used for
--- whether right-click on the channel should bring up a context menu or not,
--- typically containing an input selector, resolution menu etc.
---
--- Called once for each channel, at the start of the program.
--- Will never be called for live (0) or preview (1).
-function channel_signal(channel)
- if channel == 2 then
- return 0
- elseif channel == 3 then
- return 1
- else
- return -1
- end
-end
-
--- API ENTRY POINT
--- Called every frame. Returns the color (if any) to paint around the given
--- channel. Returns a CSS color (typically to mark live and preview signals);
--- "transparent" is allowed.
--- Will never be called for live (0) or preview (1).
-function channel_color(channel)
- if state.transition_type ~= NO_TRANSITION then
- if channel_involved_in(channel, state.transition_src_signal) or
- channel_involved_in(channel, state.transition_dst_signal) then
- return "#f00"
- end
- else
- if channel_involved_in(channel, state.live_signal_num) then
- return "#f00"
- end
- end
- if channel_involved_in(channel, state.preview_signal_num) then
- return "#0f0"
- end
- return "transparent"
-end
-
-function channel_involved_in(channel, signal_num)
- if is_plain_signal(signal_num) then
- return channel == (signal_num + 2)
- end
- if signal_num == SBS_SIGNAL_NUM then
- return (channel == 2 or channel == 3)
- end
- if signal_num == STATIC_SIGNAL_NUM then
- return (channel == 5)
- end
- return false
-end
-
--- API ENTRY POINT
--- Returns if a given channel supports setting white balance (starting from 2).
--- Called only once for each channel, at the start of the program.
-function supports_set_wb(channel)
- return is_plain_signal(channel - 2)
-end
-
--- API ENTRY POINT
--- Gets called with a new gray point when the white balance is changing.
--- The color is in linear light (not sRGB gamma).
-function set_wb(channel, red, green, blue)
- if is_plain_signal(channel - 2) then
- state.neutral_colors[channel - 2 + 1] = { red, green, blue }
- end
-end
-
-function finish_transitions(t)
- if state.transition_type ~= NO_TRANSITION and t >= state.transition_end then
- state.live_signal_num = state.transition_dst_signal
- state.transition_type = NO_TRANSITION
- end
-end
-
-function in_transition(t)
- return t >= state.transition_start and t <= state.transition_end
-end
-
--- API ENTRY POINT
--- Called every frame.
-function get_transitions(t)
- if in_transition(t) then
- -- Transition already in progress, the only thing we can do is really
- -- cut to the preview. (TODO: Make an “abort” and/or “finish”, too?)
- return {"Cut"}
- end
-
- finish_transitions(t)
-
- if state.live_signal_num == state.preview_signal_num then
- -- No transitions possible.
- return {}
- end
-
- if (is_plain_signal(state.live_signal_num) or state.live_signal_num == STATIC_SIGNAL_NUM) and
- (is_plain_signal(state.preview_signal_num) or state.preview_signal_num == STATIC_SIGNAL_NUM) then
- return {"Cut", "", "Fade"}
- end
-
- -- Various zooms.
- if state.live_signal_num == SBS_SIGNAL_NUM and is_plain_signal(state.preview_signal_num) then
- return {"Cut", "Zoom in"}
- elseif is_plain_signal(state.live_signal_num) and state.preview_signal_num == SBS_SIGNAL_NUM then
- return {"Cut", "Zoom out"}
- end
-
- return {"Cut"}
-end
-
-function swap_preview_live()
- local temp = state.live_signal_num
- state.live_signal_num = state.preview_signal_num
- state.preview_signal_num = temp
-end
-
-function start_transition(type_, t, duration)
- state.transition_start = t
- state.transition_end = t + duration
- state.transition_type = type_
- state.transition_src_signal = state.live_signal_num
- state.transition_dst_signal = state.preview_signal_num
- swap_preview_live()
-end
-
--- API ENTRY POINT
--- Called when the user clicks a transition button.
-function transition_clicked(num, t)
- if num == 0 then
- -- Cut.
- if in_transition(t) then
- -- Ongoing transition; finish it immediately before the cut.
- finish_transitions(state.transition_end)
- end
-
- swap_preview_live()
- elseif num == 1 then
- -- Zoom.
- finish_transitions(t)
-
- if state.live_signal_num == state.preview_signal_num then
- -- Nothing to do.
- return
- end
-
- if is_plain_signal(state.live_signal_num) and is_plain_signal(state.preview_signal_num) then
- -- We can't zoom between these. Just make a cut.
- io.write("Cutting from " .. state.live_signal_num .. " to " .. state.live_signal_num .. "\n")
- swap_preview_live()
- return
- end
-
- if (state.live_signal_num == SBS_SIGNAL_NUM and is_plain_signal(state.preview_signal_num)) or
- (state.preview_signal_num == SBS_SIGNAL_NUM and is_plain_signal(state.live_signal_num)) then
- start_transition(ZOOM_TRANSITION, t, 1.0)
- end
- elseif num == 2 then
- finish_transitions(t)
-
- -- Fade.
- if (state.live_signal_num ~= state.preview_signal_num) and
- (is_plain_signal(state.live_signal_num) or
- state.live_signal_num == STATIC_SIGNAL_NUM) and
- (is_plain_signal(state.preview_signal_num) or
- state.preview_signal_num == STATIC_SIGNAL_NUM) then
- start_transition(FADE_TRANSITION, t, 1.0)
- else
- -- Fades involving SBS are ignored (we have no chain for it).
- end
- end
-end
-
--- API ENTRY POINT
-function channel_clicked(num)
- state.preview_signal_num = num
-end
-
-function get_fade_chain(state, signals, t, width, height, input_resolution)
- local input0_type = get_input_type(signals, state.transition_src_signal)
- local input0_scale = needs_scale(signals, state.transition_src_signal, width, height)
- local input1_type = get_input_type(signals, state.transition_dst_signal)
- local input1_scale = needs_scale(signals, state.transition_dst_signal, width, height)
- local chain = fade_chains[input0_type][input0_scale][input1_type][input1_scale][true]
- local prepare = function()
- if input0_type == "live" or input0_type == "livedeint" then
- chain.input0.input:connect_signal(state.transition_src_signal)
- set_neutral_color_from_signal(state, chain.input0.wb_effect, state.transition_src_signal)
- end
- set_scale_parameters_if_needed(chain.input0, width, height)
- if input1_type == "live" or input1_type == "livedeint" then
- chain.input1.input:connect_signal(state.transition_dst_signal)
- set_neutral_color_from_signal(state, chain.input1.wb_effect, state.transition_dst_signal)
- end
- set_scale_parameters_if_needed(chain.input1, width, height)
- local tt = calc_fade_progress(t, state.transition_start, state.transition_end)
-
- chain.mix_effect:set_float("strength_first", 1.0 - tt)
- chain.mix_effect:set_float("strength_second", tt)
- end
- return chain.chain, prepare
-end
-
--- SBS code (live_signal_num == SBS_SIGNAL_NUM, or in a transition to/from it).
-function get_sbs_chain(signals, t, width, height, input_resolution)
- local input0_type = get_input_type(signals, INPUT0_SIGNAL_NUM)
- local input1_type = get_input_type(signals, INPUT1_SIGNAL_NUM)
- return sbs_chains[input0_type][input1_type][true]
-end
-
--- API ENTRY POINT
--- Called every frame. Get the chain for displaying at input <num>,
--- where 0 is live, 1 is preview, 2 is the first channel to display
--- in the bottom bar, and so on up to num_channels()+1. t is the
--- current time in seconds. width and height are the dimensions of
--- 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
--- it gets updated video data for the given frame. (You are allowed
--- to switch which input your input is getting from between frames,
--- but not calling connect_signal results in undefined behavior.)
--- If you want to change any parameters in the chain, this is also
--- the right place.
---
--- 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, signals)
- local input_resolution = {}
- for signal_num=0,1 do
- local res = {
- width = signals:get_width(signal_num),
- height = signals:get_height(signal_num),
- interlaced = signals:get_interlaced(signal_num),
- is_connected = signals:get_is_connected(signal_num),
- has_signal = signals:get_has_signal(signal_num),
- frame_rate_nom = signals:get_frame_rate_nom(signal_num),
- frame_rate_den = signals:get_frame_rate_den(signal_num)
- }
-
- if res.interlaced then
- -- Convert height from frame height to field height.
- -- (Needed for e.g. place_rectangle.)
- res.height = res.height * 2
-
- -- Show field rate instead of frame rate; really for cosmetics only
- -- (and actually contrary to EBU recommendations, although in line
- -- with typical user expectations).
- res.frame_rate_nom = res.frame_rate_nom * 2
- end
-
- input_resolution[signal_num] = res
- end
- last_resolution = input_resolution
-
- -- Make a (semi-shallow) copy of the current state, so that the returned prepare function
- -- is unaffected by state changes made by the UI before it is rendered.
- local state_copy = {}
- for key, value in pairs(state) do
- state_copy[key] = value
- end
- state_copy.neutral_colors = { unpack(state.neutral_colors) }
-
- if num == 0 then -- Live.
- finish_transitions(t)
- if state.transition_type == ZOOM_TRANSITION then
- -- Transition in or out of SBS.
- local chain = get_sbs_chain(signals, t, width, height, input_resolution)
- local prepare = function()
- prepare_sbs_chain(state_copy, chain, calc_zoom_progress(state_copy, t), state_copy.transition_type, state_copy.transition_src_signal, state_copy.transition_dst_signal, width, height, input_resolution)
- end
- return chain.chain, prepare
- elseif state.transition_type == NO_TRANSITION and state.live_signal_num == SBS_SIGNAL_NUM then
- -- Static SBS view.
- local chain = get_sbs_chain(signals, t, width, height, input_resolution)
- local prepare = function()
- prepare_sbs_chain(state_copy, chain, 0.0, NO_TRANSITION, 0, SBS_SIGNAL_NUM, width, height, input_resolution)
- end
- return chain.chain, prepare
- elseif state.transition_type == FADE_TRANSITION then
- return get_fade_chain(state_copy, signals, t, width, height, input_resolution)
- elseif is_plain_signal(state.live_signal_num) then
- local input_type = get_input_type(signals, state.live_signal_num)
- local input_scale = needs_scale(signals, state.live_signal_num, width, height)
- local chain = simple_chains[input_type][input_scale][true]
- local prepare = function()
- chain.input:connect_signal(state_copy.live_signal_num)
- set_scale_parameters_if_needed(chain, width, height)
- set_neutral_color_from_signal(state_copy, chain.wb_effect, state_copy.live_signal_num)
- end
- return chain.chain, prepare
- elseif state.live_signal_num == STATIC_SIGNAL_NUM then -- Static picture.
- local prepare = function()
- end
- return static_chain_hq, prepare
- else
- assert(false)
- end
- end
- if num == 1 then -- Preview.
- num = state.preview_signal_num + 2
- end
-
- -- Individual preview inputs.
- if is_plain_signal(num - 2) then
- local signal_num = num - 2
- local input_type = get_input_type(signals, signal_num)
- local input_scale = needs_scale(signals, signal_num, width, height)
- local chain = simple_chains[input_type][input_scale][false]
- local prepare = function()
- chain.input:connect_signal(signal_num)
- set_scale_parameters_if_needed(chain, width, height)
- set_neutral_color(chain.wb_effect, state_copy.neutral_colors[signal_num + 1])
- end
- return chain.chain, prepare
- end
- 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]
- local prepare = function()
- prepare_sbs_chain(state_copy, chain, 0.0, NO_TRANSITION, 0, SBS_SIGNAL_NUM, width, height, input_resolution)
- end
- return chain.chain, prepare
- end
- if num == STATIC_SIGNAL_NUM + 2 then
- local prepare = function()
- end
- return static_chain_lq, prepare
- end
-end
-
-function place_rectangle(resample_effect, resize_effect, padding_effect, x0, y0, x1, y1, screen_width, screen_height, input_width, input_height)
- local srcx0 = 0.0
- local srcx1 = 1.0
- local srcy0 = 0.0
- local srcy1 = 1.0
-
- padding_effect:set_int("width", screen_width)
- padding_effect:set_int("height", screen_height)
-
- -- Cull.
- if x0 > screen_width or x1 < 0.0 or y0 > screen_height or y1 < 0.0 then
- if resample_effect ~= nil then
- resample_effect:set_int("width", 1)
- resample_effect:set_int("height", 1)
- resample_effect:set_float("zoom_x", screen_width)
- resample_effect:set_float("zoom_y", screen_height)
- else
- resize_effect:set_int("width", 1)
- resize_effect:set_int("height", 1)
- end
- padding_effect:set_int("left", screen_width + 100)
- padding_effect:set_int("top", screen_height + 100)
- return
- end
-
- -- Clip.
- if x0 < 0 then
- srcx0 = -x0 / (x1 - x0)
- x0 = 0
- end
- if y0 < 0 then
- srcy0 = -y0 / (y1 - y0)
- y0 = 0
- end
- if x1 > screen_width then
- srcx1 = (screen_width - x0) / (x1 - x0)
- x1 = screen_width
- end
- if y1 > screen_height then
- srcy1 = (screen_height - y0) / (y1 - y0)
- y1 = screen_height
- end
-
- if resample_effect ~= nil then
- -- High-quality resampling.
- local x_subpixel_offset = x0 - math.floor(x0)
- local y_subpixel_offset = y0 - math.floor(y0)
-
- -- Resampling must be to an integral number of pixels. Round up,
- -- and then add an extra pixel so we have some leeway for the border.
- local width = math.ceil(x1 - x0) + 1
- local height = math.ceil(y1 - y0) + 1
- resample_effect:set_int("width", width)
- resample_effect:set_int("height", height)
-
- -- Correct the discrepancy with zoom. (This will leave a small
- -- excess edge of pixels and subpixels, which we'll correct for soon.)
- local zoom_x = (x1 - x0) / (width * (srcx1 - srcx0))
- local zoom_y = (y1 - y0) / (height * (srcy1 - srcy0))
- resample_effect:set_float("zoom_x", zoom_x)
- resample_effect:set_float("zoom_y", zoom_y)
- resample_effect:set_float("zoom_center_x", 0.0)
- resample_effect:set_float("zoom_center_y", 0.0)
-
- -- Padding must also be to a whole-pixel offset.
- padding_effect:set_int("left", math.floor(x0))
- padding_effect:set_int("top", math.floor(y0))
-
- -- Correct _that_ discrepancy by subpixel offset in the resampling.
- resample_effect:set_float("left", srcx0 * input_width - x_subpixel_offset / zoom_x)
- resample_effect:set_float("top", srcy0 * input_height - y_subpixel_offset / zoom_y)
-
- -- Finally, adjust the border so it is exactly where we want it.
- padding_effect:set_float("border_offset_left", x_subpixel_offset)
- padding_effect:set_float("border_offset_right", x1 - (math.floor(x0) + width))
- padding_effect:set_float("border_offset_top", y_subpixel_offset)
- padding_effect:set_float("border_offset_bottom", y1 - (math.floor(y0) + height))
- else
- -- Lower-quality simple resizing.
- local width = round(x1 - x0)
- local height = round(y1 - y0)
- resize_effect:set_int("width", width)
- resize_effect:set_int("height", height)
-
- -- Padding must also be to a whole-pixel offset.
- padding_effect:set_int("left", math.floor(x0))
- padding_effect:set_int("top", math.floor(y0))
- end
-end
-
--- This is broken, of course (even for positive numbers), but Lua doesn't give us access to real rounding.
-function round(x)
- return math.floor(x + 0.5)
-end
-
-function lerp(a, b, t)
- return a + (b - a) * t
-end
-
-function lerp_pos(a, b, t)
- return {
- x0 = lerp(a.x0, b.x0, t),
- y0 = lerp(a.y0, b.y0, t),
- x1 = lerp(a.x1, b.x1, t),
- y1 = lerp(a.y1, b.y1, t)
- }
-end
-
-function pos_from_top_left(x, y, width, height, screen_width, screen_height)
- local xs = screen_width / 1280.0
- local ys = screen_height / 720.0
- return {
- x0 = round(xs * x),
- y0 = round(ys * y),
- x1 = round(xs * (x + width)),
- y1 = round(ys * (y + height))
- }
-end
-
-function prepare_sbs_chain(state, chain, t, transition_type, src_signal, dst_signal, screen_width, screen_height, input_resolution)
- chain.input0.input:connect_signal(0)
- chain.input1.input:connect_signal(1)
- set_neutral_color(chain.input0.wb_effect, state.neutral_colors[1])
- set_neutral_color(chain.input1.wb_effect, state.neutral_colors[2])
-
- -- First input is positioned (16,48) from top-left.
- -- Second input is positioned (16,48) from the bottom-right.
- local pos0 = pos_from_top_left(16, 48, 848, 477, screen_width, screen_height)
- local pos1 = pos_from_top_left(1280 - 384 - 16, 720 - 216 - 48, 384, 216, screen_width, screen_height)
-
- local pos_fs = { x0 = 0, y0 = 0, x1 = screen_width, y1 = screen_height }
- local affine_param
- if transition_type == NO_TRANSITION then
- -- Static SBS view.
- affine_param = { sx = 1.0, sy = 1.0, tx = 0.0, ty = 0.0 } -- Identity.
- else
- -- Zooming to/from SBS view into or out of a single view.
- assert(transition_type == ZOOM_TRANSITION)
- local signal, real_t
- if src_signal == SBS_SIGNAL_NUM then
- signal = dst_signal
- real_t = t
- else
- assert(dst_signal == SBS_SIGNAL_NUM)
- signal = src_signal
- real_t = 1.0 - t
- end
-
- if signal == INPUT0_SIGNAL_NUM then
- affine_param = find_affine_param(pos0, lerp_pos(pos0, pos_fs, real_t))
- elseif signal == INPUT1_SIGNAL_NUM then
- affine_param = find_affine_param(pos1, lerp_pos(pos1, pos_fs, real_t))
- end
- end
-
- -- NOTE: input_resolution is not 1-indexed, unlike usual Lua arrays.
- place_rectangle_with_affine(chain.input0.resample_effect, chain.input0.resize_effect, chain.input0.padding_effect, pos0, affine_param, screen_width, screen_height, input_resolution[0].width, input_resolution[0].height)
- place_rectangle_with_affine(chain.input1.resample_effect, chain.input1.resize_effect, chain.input1.padding_effect, pos1, affine_param, screen_width, screen_height, input_resolution[1].width, input_resolution[1].height)
-end
-
--- Find the transformation that changes the first rectangle to the second one.
-function find_affine_param(a, b)
- local sx = (b.x1 - b.x0) / (a.x1 - a.x0)
- local sy = (b.y1 - b.y0) / (a.y1 - a.y0)
- return {
- sx = sx,
- sy = sy,
- tx = b.x0 - a.x0 * sx,
- ty = b.y0 - a.y0 * sy
- }
-end
-
-function place_rectangle_with_affine(resample_effect, resize_effect, padding_effect, pos, aff, screen_width, screen_height, input_width, input_height)
- local x0 = pos.x0 * aff.sx + aff.tx
- local x1 = pos.x1 * aff.sx + aff.tx
- local y0 = pos.y0 * aff.sy + aff.ty
- local y1 = pos.y1 * aff.sy + aff.ty
-
- place_rectangle(resample_effect, resize_effect, padding_effect, x0, y0, x1, y1, screen_width, screen_height, input_width, input_height)
-end
-
-function set_neutral_color(effect, color)
- effect:set_vec3("neutral_color", color[1], color[2], color[3])
-end
-
-function set_neutral_color_from_signal(state, effect, signal)
- if is_plain_signal(signal) then
- set_neutral_color(effect, state.neutral_colors[signal - INPUT0_SIGNAL_NUM + 1])
- end
-end
-
-function calc_zoom_progress(state, t)
- if t < state.transition_start then
- return 0.0
- elseif t > state.transition_end then
- return 1.0
- else
- local tt = (t - state.transition_start) / (state.transition_end - state.transition_start)
- -- Smooth it a bit.
- return math.sin(tt * 3.14159265358 * 0.5)
- 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
- return 0.0
- elseif tt > 1.0 then
- return 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