-- 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.
-io.write("hello from lua\n");
-
-local live_signal_num = 0;
-local preview_signal_num = 1;
-
--- The main live chain. Currently just about input 0 with some color correction.
-local main_chain = EffectChain.new(16, 9);
-local input0 = main_chain:add_live_input();
-input0:connect_signal(0);
-local resample_effect = main_chain:add_effect(ResampleEffect.new(), input0);
-resample_effect:set_int("width", 320);
-resample_effect:set_int("height", 180);
-local wb_effect = main_chain:add_effect(WhiteBalanceEffect.new(), resample_effect);
-main_chain:finalize(true);
--- local input1 = main_chain.add_input(Inputs.create(1));
--- local resample_effect = main_chain.add_effect(ResampleEffect.new(), input0);
--- local padding_effect = main_chain.add_effect(IntegralPaddingEffect.new());
-
--- A chain to show a single input on screen.
-local simple_chain = EffectChain.new(16, 9);
-local simple_chain_input = simple_chain:add_live_input();
-simple_chain_input:connect_signal(0); -- First input card. Can be changed whenever you want.
-simple_chain:finalize(false);
+io.write("hello from lua\n")
+
+local zoom_start = -2.0
+local zoom_end = -1.0
+local zoom_src = 0.0
+local zoom_dst = 1.0
+
+local live_signal_num = 0
+local preview_signal_num = 1
+
+-- The main live chain.
+function make_sbs_chain(hq)
+ local chain = EffectChain.new(16, 9)
+ local input0 = chain:add_live_input()
+ input0:connect_signal(0)
+ local input1 = chain:add_live_input()
+ input1:connect_signal(1)
+
+ local resample_effect = nil
+ local resize_effect = nil
+ if (hq) then
+ resample_effect = chain:add_effect(ResampleEffect.new(), input0)
+ else
+ resize_effect = chain:add_effect(ResizeEffect.new(), input0)
+ end
+
+ local padding_effect = chain:add_effect(IntegralPaddingEffect.new())
+ padding_effect:set_vec4("border_color", 0.0, 0.0, 0.0, 1.0)
+
+ local resample2_effect = nil
+ local resize2_effect = nil
+ if (hq) then
+ resample2_effect = chain:add_effect(ResampleEffect.new(), input1)
+ else
+ resize2_effect = chain:add_effect(ResizeEffect.new(), input1)
+ end
+ -- Effect *saturation_effect = chain->add_effect(new SaturationEffect())
+ -- CHECK(saturation_effect->set_float("saturation", 0.3f))
+ local wb_effect = chain:add_effect(WhiteBalanceEffect.new())
+ wb_effect:set_float("output_color_temperature", 3500.0)
+ local padding2_effect = chain:add_effect(IntegralPaddingEffect.new())
+
+ chain:add_effect(OverlayEffect.new(), padding_effect, padding2_effect)
+ chain:finalize(hq)
+
+ return {
+ chain = chain,
+ input0 = {
+ input = input0,
+ resample_effect = resample_effect,
+ resize_effect = resize_effect,
+ padding_effect = padding_effect
+ },
+ input1 = {
+ input = input1,
+ resample_effect = resample2_effect,
+ resize_effect = resize2_effect,
+ padding_effect = padding2_effect
+ }
+ }
+end
+
+local main_chain_hq = make_sbs_chain(true)
+local main_chain_lq = make_sbs_chain(false)
+
+-- A chain to show a single input on screen (HQ version).
+local simple_chain_hq = EffectChain.new(16, 9)
+local simple_chain_hq_input = simple_chain_hq:add_live_input()
+simple_chain_hq_input:connect_signal(0); -- First input card. Can be changed whenever you want.
+simple_chain_hq:finalize(true)
+
+-- A chain to show a single input on screen (LQ version).
+local simple_chain_lq = EffectChain.new(16, 9)
+local simple_chain_lq_input = simple_chain_lq:add_live_input()
+simple_chain_lq_input:connect_signal(0); -- First input card. Can be changed whenever you want.
+simple_chain_lq:finalize(false)
-- 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;
+ return 3
end
-- Called every frame.
function get_transitions()
- return {"Cut", "Fade", "Zoom!"};
+ return {"Cut", "Fade", "Zoom!"}
end
function transition_clicked(num, t)
- -- Only a cut for now.
- local temp = live_signal_num;
- live_signal_num = preview_signal_num;
- preview_signal_num = temp;
+ -- local temp = live_signal_num
+ -- live_signal_num = preview_signal_num
+ -- preview_signal_num = temp
+
+ zoom_start = t
+ zoom_end = t + 1.0
+
+ local temp = zoom_src
+ zoom_src = zoom_dst
+ zoom_dst = temp
end
-function channel_clicked(num, t)
- -- Presumably change the preview here.
- io.write("STUB: channel_clicked\n");
+function channel_clicked(num)
+ preview_signal_num = num
end
-- Called every frame. Get the chain for displaying at input <num>,
-- if and only if num==0.
function get_chain(num, t, width, height)
if num == 0 then -- Live.
+ if t > zoom_end and zoom_dst == 1.0 then
+ -- Special case: Show only the single image on screen.
+ prepare = function()
+ simple_chain_hq_input:connect_signal(live_signal_num)
+ end
+ return simple_chain_hq, prepare
+ end
prepare = function()
- input0:connect_signal(live_signal_num);
- wb_effect:set_float("output_color_temperature", 3500.0 + t * 100.0);
+ if t < zoom_start then
+ prepare_sbs_chain(main_chain_hq, zoom_src, width, height)
+ elseif t > zoom_end then
+ prepare_sbs_chain(main_chain_hq, zoom_dst, width, height)
+ else
+ local tt = (t - zoom_start) / (zoom_end - zoom_start)
+ -- Smooth it a bit.
+ tt = math.sin(tt * 3.14159265358 * 0.5)
+ prepare_sbs_chain(main_chain_hq, zoom_src + (zoom_dst - zoom_src) * tt, width, height)
+ end
end
- return main_chain, prepare;
+ return main_chain_hq.chain, prepare
end
if num == 1 then -- Preview.
- prepare = function()
- simple_chain_input:connect_signal(preview_signal_num);
- end
- return simple_chain, prepare;
+ num = preview_signal_num + 2
end
if num == 2 then
prepare = function()
- simple_chain_input:connect_signal(0);
+ simple_chain_lq_input:connect_signal(0)
end
- return simple_chain, prepare;
+ return simple_chain_lq, prepare
end
if num == 3 then
prepare = function()
- simple_chain_input:connect_signal(1);
+ simple_chain_lq_input:connect_signal(1)
+ end
+ return simple_chain_lq, prepare
+ end
+ if num == 4 then
+ prepare = function()
+ prepare_sbs_chain(main_chain_lq, 0.0, width, height)
end
- return simple_chain, prepare;
+ return main_chain_lq.chain, prepare
end
end
+function place_rectangle(resample_effect, resize_effect, padding_effect, x0, y0, x1, y1, screen_width, screen_height)
+ local srcx0 = 0.0
+ local srcx1 = 1.0
+ local srcy0 = 0.0
+ local srcy1 = 1.0
+
+ -- Cull.
+ if x0 > screen_width or x1 < 0.0 or y0 > screen_height or y1 < 0.0 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)
+ padding_effect:set_int("left", screen_width + 100)
+ padding_effect:set_int("top", screen_height + 100)
+ return
+ end
+
+ -- Clip. (TODO: Clip on upper/left sides, too.)
+ 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", -x_subpixel_offset / zoom_x)
+ resample_effect:set_float("top", -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 prepare_sbs_chain(chain, t, screen_width, screen_height)
+ chain.input0.input:connect_signal(live_signal_num)
+ chain.input1.input:connect_signal(1)
+
+ -- First input is positioned (16,48) from top-left.
+ local width0 = round(848 * screen_width/1280.0)
+ local height0 = round(width0 * 9.0 / 16.0)
+
+ local top0 = 48 * screen_height/720.0
+ local left0 = 16 * screen_width/1280.0
+ local bottom0 = top0 + height0
+ local right0 = left0 + width0
+
+ -- Second input is positioned (16,48) from the bottom-right.
+ local width1 = 384 * screen_width/1280.0
+ local height1 = 216 * screen_height/720.0
+
+ local bottom1 = screen_height - 48 * screen_height/720.0
+ local right1 = screen_width - 16 * screen_width/1280.0
+ local top1 = bottom1 - height1
+ local left1 = right1 - width1
+
+ -- Interpolate between the fullscreen and side-by-side views.
+ local scale0 = 1.0 + t * (1280.0 / 848.0 - 1.0)
+ local tx0 = 0.0 + t * (-left0 * scale0)
+ local ty0 = 0.0 + t * (-top0 * scale0)
+
+ top0 = top0 * scale0 + ty0
+ bottom0 = bottom0 * scale0 + ty0
+ left0 = left0 * scale0 + tx0
+ right0 = right0 * scale0 + tx0
+
+ top1 = top1 * scale0 + ty0
+ bottom1 = bottom1 * scale0 + ty0
+ left1 = left1 * scale0 + tx0
+ right1 = right1 * scale0 + tx0
+ place_rectangle(chain.input0.resample_effect, chain.input0.resize_effect, chain.input0.padding_effect, left0, top0, right0, bottom0, screen_width, screen_height)
+ place_rectangle(chain.input1.resample_effect, chain.input1.resize_effect, chain.input1.padding_effect, left1, top1, right1, bottom1, screen_width, screen_height)
+end
projects / nageru / blobdiff