X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=simple.lua;fp=simple.lua;h=0000000000000000000000000000000000000000;hb=392f9d1ccb835c05a3874c4bea163788b2c37024;hp=2bff8f341a09387f643d92bc397b14b1d92ea501;hpb=330ca2f0052b06d91004c6ceb73cd57ab95e7fe1;p=nageru diff --git a/simple.lua b/simple.lua deleted file mode 100644 index 2bff8f3..0000000 --- a/simple.lua +++ /dev/null @@ -1,179 +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. --- --- This is a much simpler theme than the default theme; it only allows you to --- switch between inputs and set white balance, no transitions or the likes. --- Thus, it should be simpler to understand. - -local input_neutral_color = {{0.5, 0.5, 0.5}, {0.5, 0.5, 0.5}} - -local live_signal_num = 0 -local preview_signal_num = 1 - --- A chain to show a single input, with white balance. In a real example, --- we'd probably want to support deinterlacing and high-quality scaling --- (if the input isn't exactly what we want). However, we don't want these --- things always on, so we'd need to generate more chains for the various --- cases. In such a simple example, just having two is fine. -function make_simple_chain(hq) - local chain = EffectChain.new(16, 9) - - local input = chain:add_live_input(false, false) -- No deinterlacing, no bounce override. - input:connect_signal(0) -- First input card. Can be changed whenever you want. - local wb_effect = chain:add_effect(WhiteBalanceEffect.new()) - chain:finalize(hq) - - return { - chain = chain, - input = input, - wb_effect = wb_effect, - } -end - --- We only make two chains; one for the live view and one for the previews. --- (Since they have different outputs, you cannot mix and match them.) -local simple_hq_chain = make_simple_chain(true) -local simple_lq_chain = make_simple_chain(false) - --- 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 2 -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) - if channel == 2 then - return "First input" - elseif channel == 3 then - return "Second input" - 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. --- (The information is used for whether right-click on the channel should bring up --- an input selector or not.) --- 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) - return "transparent" -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 channel == 2 or channel == 3 -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 channel == 2 then - input_neutral_color[1] = { red, green, blue } - elseif channel == 3 then - input_neutral_color[2] = { red, green, blue } - end -end - --- API ENTRY POINT --- Called every frame. -function get_transitions(t) - if live_signal_num == preview_signal_num then - -- No transitions possible. - return {} - else - return {"Cut"} - end -end - --- API ENTRY POINT --- Called when the user clicks a transition button. For our case, --- we only do cuts, so we ignore the parameters; just switch live and preview. -function transition_clicked(num, t) - local temp = live_signal_num - live_signal_num = preview_signal_num - preview_signal_num = temp -end - --- API ENTRY POINT -function channel_clicked(num) - preview_signal_num = num -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 chain, signal_num - if num == 0 then -- Live (right pane). - chain = simple_hq_chain - signal_num = live_signal_num - elseif num == 1 then -- Preview (left pane). - chain = simple_lq_chain - signal_num = preview_signal_num - else -- One of the two previews (bottom panes). - chain = simple_lq_chain - signal_num = num - 2 - end - - -- Make a copy of the current neutral color before returning, so that the - -- returned prepare function is unaffected by state changes made by the UI - -- before it is rendered. - local color = input_neutral_color[signal_num + 1] - - local prepare = function() - chain.input:connect_signal(signal_num) - chain.wb_effect:set_vec3("neutral_color", color[1], color[2], color[3]) - end - return chain.chain, prepare -end