X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=theme.lua;fp=theme.lua;h=0000000000000000000000000000000000000000;hb=392f9d1ccb835c05a3874c4bea163788b2c37024;hp=401cbd9b842d822d74d0fbbbd2f437e630e3e95e;hpb=330ca2f0052b06d91004c6ceb73cd57ab95e7fe1;p=nageru diff --git a/theme.lua b/theme.lua deleted file mode 100644 index 401cbd9..0000000 --- a/theme.lua +++ /dev/null @@ -1,883 +0,0 @@ --- 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 , --- 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). --- --- 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