-function prepare_live_chain(t, width, height)
- input0:connect_signal(live_signal_num);
- input1:connect_signal(1);
-
- local width0 = 848;
- local height0 = round(width0 * 9.0 / 16.0);
-
- local top0 = 48;
- local left0 = 16;
- local bottom0 = top0 + height0;
- local right0 = left0 + width0;
-
- local width1 = 384;
- local height1 = 216;
-
- local bottom1 = 720 - 48;
- local right1 = 1280 - 16;
- local top1 = bottom1 - height1;
- local left1 = right1 - width1;
- local sub_t = 0.5 + 0.5 * math.cos(t * 1.0);
- local scale0 = 1.0 + sub_t * (1280.0 / 848.0 - 1.0);
- local tx0 = 0.0 + sub_t * (-16.0 * scale0);
- local ty0 = 0.0 + sub_t * (-48.0 * 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(resample_effect, padding_effect, left0, top0, right0, bottom0);
- place_rectangle(resample2_effect, padding2_effect, left1, top1, right1, bottom1);
+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(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, neutral_colors[1])
+ set_neutral_color(chain.input1.wb_effect, 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(effect, signal)
+ if is_plain_signal(signal) then
+ set_neutral_color(effect, neutral_colors[signal - INPUT0_SIGNAL_NUM + 1])
+ end
+end
+
+function calc_zoom_progress(t)
+ if t < transition_start then
+ return 0.0
+ elseif t > transition_end then
+ return 1.0
+ else
+ local tt = (t - transition_start) / (transition_end - 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